mirror of
https://github.com/jenkinsci/jenkins.git
synced 2026-11-11 19:16:42 +00:00
Jesse Glick
22d433deae
Even though SezpozModule.configure catches and ignores the faulty component, Guice still dies: … hudson.ExtensionFinder$GuiceFinder <init> SEVERE: Failed to create Guice container from all the plugins com.google.inject.internal.guava.collect.$ComputationException: java.lang.NoClassDefFoundError: org/eclipse/jgit/storage/file/FileRepository at … at com.google.inject.Guice.createInjector(Guice.java:73) at hudson.ExtensionFinder$GuiceFinder.<init>(ExtensionFinder.java:279)
696 lines
29 KiB
Java
696 lines
29 KiB
Java
/*
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* The MIT License
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*
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* Copyright (c) 2004-2010, Sun Microsystems, Inc., InfraDNA, Inc., CloudBees, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package hudson;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Maps;
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import com.google.inject.AbstractModule;
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import com.google.inject.Binding;
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import com.google.inject.Guice;
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import com.google.inject.Injector;
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import com.google.inject.Key;
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import com.google.inject.Module;
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import com.google.inject.Provider;
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import com.google.inject.Scope;
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import com.google.inject.Scopes;
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import com.google.inject.name.Names;
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import com.google.common.collect.ImmutableList;
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import hudson.init.InitMilestone;
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import hudson.model.Descriptor;
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import hudson.model.Hudson;
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import jenkins.ExtensionComponentSet;
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import jenkins.ExtensionFilter;
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import jenkins.ExtensionRefreshException;
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import jenkins.ProxyInjector;
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import jenkins.model.Jenkins;
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import net.java.sezpoz.Index;
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import net.java.sezpoz.IndexItem;
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import org.kohsuke.accmod.Restricted;
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import org.kohsuke.accmod.restrictions.NoExternalUse;
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import java.lang.annotation.Annotation;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.logging.Logger;
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import java.util.logging.Level;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.lang.reflect.AnnotatedElement;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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/**
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* Discovers the implementations of an extension point.
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*
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* <p>
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* This extension point allows you to write your implementations of {@link ExtensionPoint}s
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* in arbitrary DI containers, and have Hudson discover them.
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*
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* <p>
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* {@link ExtensionFinder} itself is an extension point, but to avoid infinite recursion,
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* Jenkins discovers {@link ExtensionFinder}s through {@link Sezpoz} and that alone.
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*
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* @author Kohsuke Kawaguchi
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* @since 1.286
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* @see ExtensionFilter
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*/
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public abstract class ExtensionFinder implements ExtensionPoint {
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/**
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* @deprecated as of 1.356
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* Use and implement {@link #find(Class,Hudson)} that allows us to put some metadata.
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*/
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@Restricted(NoExternalUse.class)
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public <T> Collection<T> findExtensions(Class<T> type, Hudson hudson) {
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return Collections.emptyList();
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}
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/**
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* Returns true if this extension finder supports the {@link #refresh()} operation.
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*/
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public boolean isRefreshable() {
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try {
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return getClass().getMethod("refresh").getDeclaringClass()!=ExtensionFinder.class;
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} catch (NoSuchMethodException e) {
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return false;
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}
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}
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/**
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* Rebuilds the internal index, if any, so that future {@link #find(Class, Hudson)} calls
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* will discover components newly added to {@link PluginManager#uberClassLoader}.
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*
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* <p>
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* The point of the refresh operation is not to disrupt instances of already loaded {@link ExtensionComponent}s,
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* and only instantiate those that are new. Otherwise this will break the singleton semantics of various
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* objects, such as {@link Descriptor}s.
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*
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* <p>
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* The behaviour is undefined if {@link #isRefreshable()} is returning false.
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*
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* @since 1.442
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* @see #isRefreshable()
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* @return never null
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*/
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public abstract ExtensionComponentSet refresh() throws ExtensionRefreshException;
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/**
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* Discover extensions of the given type.
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*
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* <p>
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* This method is called only once per the given type after all the plugins are loaded,
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* so implementations need not worry about caching.
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*
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* <p>
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* This method should return all the known components at the time of the call, including
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* those that are discovered later via {@link #refresh()}, even though those components
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* are separately returned in {@link ExtensionComponentSet}.
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*
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* @param <T>
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* The type of the extension points. This is not bound to {@link ExtensionPoint} because
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* of {@link Descriptor}, which by itself doesn't implement {@link ExtensionPoint} for
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* a historical reason.
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* @param jenkins
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* Jenkins whose behalf this extension finder is performing lookup.
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* @return
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* Can be empty but never null.
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* @since 1.356
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* Older implementations provide {@link #findExtensions(Class,Hudson)}
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*/
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public abstract <T> Collection<ExtensionComponent<T>> find(Class<T> type, Hudson jenkins);
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@Deprecated
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public <T> Collection<ExtensionComponent<T>> _find(Class<T> type, Hudson hudson) {
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return find(type, hudson);
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}
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/**
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* Performs class initializations without creating instances.
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*
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* If two threads try to initialize classes in the opposite order, a dead lock will ensue,
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* and we can get into a similar situation with {@link ExtensionFinder}s.
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*
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* <p>
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* That is, one thread can try to list extensions, which results in {@link ExtensionFinder}
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* loading and initializing classes. This happens inside a context of a lock, so that
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* another thread that tries to list the same extensions don't end up creating different
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* extension instances. So this activity locks extension list first, then class initialization next.
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*
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* <p>
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* In the mean time, another thread can load and initialize a class, and that initialization
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* can eventually results in listing up extensions, for example through static initializer.
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* Such activity locks class initialization first, then locks extension list.
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*
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* <p>
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* This inconsistent locking order results in a dead lock, you see.
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*
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* <p>
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* So to reduce the likelihood, this method is called in prior to {@link #find(Class,Hudson)} invocation,
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* but from outside the lock. The implementation is expected to perform all the class initialization activities
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* from here.
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*
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* <p>
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* See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6459208 for how to force a class initialization.
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* Also see http://kohsuke.org/2010/09/01/deadlock-that-you-cant-avoid/ for how class initialization
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* can results in a dead lock.
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*/
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public void scout(Class extensionType, Hudson hudson) {
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}
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@Extension
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public static final class DefaultGuiceExtensionAnnotation extends GuiceExtensionAnnotation<Extension> {
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public DefaultGuiceExtensionAnnotation() {
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super(Extension.class);
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}
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@Override
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protected boolean isOptional(Extension annotation) {
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return annotation.optional();
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}
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@Override
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protected double getOrdinal(Extension annotation) {
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return annotation.ordinal();
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}
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@Override
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protected boolean isActive(AnnotatedElement e) {
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return true;
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}
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}
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/**
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* Captures information about the annotation that we use to mark Guice-instantiated components.
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*/
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public static abstract class GuiceExtensionAnnotation<T extends Annotation> {
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public final Class<T> annotationType;
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protected GuiceExtensionAnnotation(Class<T> annotationType) {
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this.annotationType = annotationType;
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}
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protected abstract double getOrdinal(T annotation);
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/**
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* Hook to enable subtypes to control which ones to pick up and which ones to ignore.
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*/
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protected abstract boolean isActive(AnnotatedElement e);
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protected abstract boolean isOptional(T annotation);
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}
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/**
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* Discovers components via sezpoz but instantiates them by using Guice.
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*/
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@Extension
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public static class GuiceFinder extends ExtensionFinder {
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/**
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* Injector that we find components from.
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* <p>
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* To support refresh when Guice doesn't let us alter the bindings, we'll create
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* a child container to house newly discovered components. This field points to the
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* youngest such container.
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*/
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private volatile Injector container;
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/**
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* Sezpoz index we are currently using in {@link #container} (and its ancestors.)
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* Needed to compute delta.
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*/
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private List<IndexItem<?,Object>> sezpozIndex;
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private final Map<Key,Annotation> annotations = new HashMap<Key,Annotation>();
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private final Sezpoz moduleFinder = new Sezpoz();
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/**
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* Map from {@link GuiceExtensionAnnotation#annotationType} to {@link GuiceExtensionAnnotation}
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*/
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private Map<Class<? extends Annotation>,GuiceExtensionAnnotation<?>> extensionAnnotations = Maps.newHashMap();
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public GuiceFinder() {
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for (ExtensionComponent<GuiceExtensionAnnotation> ec : moduleFinder.find(GuiceExtensionAnnotation.class, Hudson.getInstance())) {
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GuiceExtensionAnnotation gea = ec.getInstance();
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extensionAnnotations.put(gea.annotationType,gea);
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}
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sezpozIndex = loadSezpozIndices(Jenkins.getInstance().getPluginManager().uberClassLoader);
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List<Module> modules = new ArrayList<Module>();
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modules.add(new AbstractModule() {
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@Override
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protected void configure() {
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Jenkins j = Jenkins.getInstance();
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bind(Jenkins.class).toInstance(j);
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bind(PluginManager.class).toInstance(j.getPluginManager());
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}
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});
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modules.add(new SezpozModule(sezpozIndex));
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for (ExtensionComponent<Module> ec : moduleFinder.find(Module.class, Hudson.getInstance())) {
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modules.add(ec.getInstance());
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}
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try {
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container = Guice.createInjector(modules);
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} catch (Throwable e) {
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LOGGER.log(Level.SEVERE, "Failed to create Guice container from all the plugins",e);
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// failing to load all bindings are disastrous, so recover by creating minimum that works
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// by just including the core
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// TODO this recovery is pretty much useless; startup crashes anyway
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container = Guice.createInjector(new SezpozModule(loadSezpozIndices(Jenkins.class.getClassLoader())));
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}
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// expose Injector via lookup mechanism for interop with non-Guice clients
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Jenkins.getInstance().lookup.set(Injector.class,new ProxyInjector() {
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protected Injector resolve() {
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return getContainer();
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}
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});
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}
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private ImmutableList<IndexItem<?, Object>> loadSezpozIndices(ClassLoader classLoader) {
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List<IndexItem<?,Object>> indices = Lists.newArrayList();
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for (GuiceExtensionAnnotation<?> gea : extensionAnnotations.values()) {
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Iterables.addAll(indices, Index.load(gea.annotationType, Object.class, classLoader));
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}
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return ImmutableList.copyOf(indices);
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}
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public Injector getContainer() {
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return container;
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}
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/**
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* The basic idea is:
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*
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* <ul>
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* <li>List up delta as a series of modules
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* <li>
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* </ul>
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*/
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@Override
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public synchronized ExtensionComponentSet refresh() throws ExtensionRefreshException {
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// figure out newly discovered sezpoz components
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List<IndexItem<?, Object>> delta = Lists.newArrayList();
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for (Class<? extends Annotation> annotationType : extensionAnnotations.keySet()) {
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delta.addAll(Sezpoz.listDelta(annotationType,sezpozIndex));
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}
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List<IndexItem<?, Object>> l = Lists.newArrayList(sezpozIndex);
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l.addAll(delta);
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sezpozIndex = l;
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List<Module> modules = new ArrayList<Module>();
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modules.add(new SezpozModule(delta));
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for (ExtensionComponent<Module> ec : moduleFinder.refresh().find(Module.class)) {
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modules.add(ec.getInstance());
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}
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try {
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final Injector child = container.createChildInjector(modules);
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container = child;
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return new ExtensionComponentSet() {
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@Override
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public <T> Collection<ExtensionComponent<T>> find(Class<T> type) {
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List<ExtensionComponent<T>> result = new ArrayList<ExtensionComponent<T>>();
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_find(type, result, child);
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return result;
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}
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};
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} catch (Throwable e) {
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LOGGER.log(Level.SEVERE, "Failed to create Guice container from newly added plugins",e);
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throw new ExtensionRefreshException(e);
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}
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}
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private Object instantiate(IndexItem<?,Object> item) {
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try {
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return item.instance();
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} catch (LinkageError e) {
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// sometimes the instantiation fails in an indirect classloading failure,
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// which results in a LinkageError
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LOGGER.log(isOptional(item.annotation()) ? Level.FINE : Level.WARNING,
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"Failed to load "+item.className(), e);
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} catch (Exception e) {
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LOGGER.log(isOptional(item.annotation()) ? Level.FINE : Level.WARNING,
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"Failed to load "+item.className(), e);
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}
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return null;
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}
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private boolean isOptional(Annotation annotation) {
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GuiceExtensionAnnotation gea = extensionAnnotations.get(annotation.annotationType());
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return gea.isOptional(annotation);
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}
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private boolean isActive(Annotation annotation, AnnotatedElement e) {
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GuiceExtensionAnnotation gea = extensionAnnotations.get(annotation.annotationType());
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return gea.isActive(e);
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}
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public <U> Collection<ExtensionComponent<U>> find(Class<U> type, Hudson jenkins) {
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// the find method contract requires us to traverse all known components
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List<ExtensionComponent<U>> result = new ArrayList<ExtensionComponent<U>>();
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for (Injector i=container; i!=null; i=i.getParent()) {
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_find(type, result, i);
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}
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return result;
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}
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private <U> void _find(Class<U> type, List<ExtensionComponent<U>> result, Injector container) {
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for (Entry<Key<?>, Binding<?>> e : container.getBindings().entrySet()) {
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if (type.isAssignableFrom(e.getKey().getTypeLiteral().getRawType())) {
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Annotation a = annotations.get(e.getKey());
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Object o = e.getValue().getProvider().get();
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if (o!=null) {
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GuiceExtensionAnnotation gea = a!=null ? extensionAnnotations.get(a.annotationType()) : null;
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result.add(new ExtensionComponent<U>(type.cast(o),gea!=null?gea.getOrdinal(a):0));
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}
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}
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}
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}
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/**
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* TODO: need to learn more about concurrent access to {@link Injector} and how it interacts
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* with classloading.
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*/
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@Override
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public void scout(Class extensionType, Hudson hudson) {
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}
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/**
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* {@link Scope} that allows a failure to create a component,
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* and change the value to null.
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*
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* <p>
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* This is necessary as a failure to load one plugin shouldn't fail the startup of the entire Jenkins.
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* Instead, we should just drop the failing plugins.
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*/
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public static final Scope FAULT_TOLERANT_SCOPE = new FaultTolerantScope(true);
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private static final Scope QUIET_FAULT_TOLERANT_SCOPE = new FaultTolerantScope(false);
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private static final class FaultTolerantScope implements Scope {
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private final boolean verbose;
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FaultTolerantScope(boolean verbose) {
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this.verbose = verbose;
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}
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public <T> Provider<T> scope(final Key<T> key, final Provider<T> unscoped) {
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final Provider<T> base = Scopes.SINGLETON.scope(key,unscoped);
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return new Provider<T>() {
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public T get() {
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try {
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return base.get();
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} catch (Exception e) {
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error(key, e);
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return null;
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} catch (LinkageError e) {
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error(key, e);
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return null;
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}
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}
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void error(Key<T> key, Throwable x) {
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if (verbose) {
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LOGGER.log(Level.WARNING, "Failed to instantiate " + key + "; skipping this component", x);
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} else {
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LOGGER.log(Level.WARNING, "Failed to instantiate optional component {0}; skipping", key.getTypeLiteral());
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LOGGER.log(Level.FINE, key.toString(), x);
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}
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}
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};
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}
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};
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private static final Logger LOGGER = Logger.getLogger(GuiceFinder.class.getName());
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/**
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* {@link Module} that finds components via sezpoz index.
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* Instead of using SezPoz to instantiate, we'll instantiate them by using Guice,
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* so that we can take advantage of dependency injection.
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*/
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private class SezpozModule extends AbstractModule {
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private final List<IndexItem<?,Object>> index;
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public SezpozModule(List<IndexItem<?,Object>> index) {
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this.index = index;
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}
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/**
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* Guice performs various reflection operations on the class to figure out the dependency graph,
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* and that process can cause additional classloading problems, which will fail the injector creation,
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* which in turn has disastrous effect on the startup.
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*
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* <p>
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* Ultimately I'd like to isolate problems to plugins and selectively disable them, allowing
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* Jenkins to start with plugins that work, but I haven't figured out how.
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*
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* So this is an attempt to detect subset of problems eagerly, by invoking various reflection
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* operations and try to find non-existent classes early.
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*/
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private void resolve(Class c) {
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try {
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c.getGenericSuperclass();
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c.getGenericInterfaces();
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ClassLoader ecl = c.getClassLoader();
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Method m = ClassLoader.class.getDeclaredMethod("resolveClass", Class.class);
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m.setAccessible(true);
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m.invoke(ecl, c);
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c.getConstructors();
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c.getMethods();
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c.getFields();
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LOGGER.log(Level.FINER, "{0} looks OK", c);
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while (c != Object.class) {
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c.getGenericSuperclass();
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c = c.getSuperclass();
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}
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|
} catch (Exception x) {
|
|
throw (LinkageError)new LinkageError("Failed to resolve "+c).initCause(x);
|
|
}
|
|
}
|
|
|
|
@SuppressWarnings({"unchecked", "ChainOfInstanceofChecks"})
|
|
@Override
|
|
protected void configure() {
|
|
int id=0;
|
|
|
|
for (final IndexItem<?,Object> item : index) {
|
|
id++;
|
|
boolean optional = isOptional(item.annotation());
|
|
try {
|
|
AnnotatedElement e = item.element();
|
|
Annotation a = item.annotation();
|
|
if (!isActive(a,e)) continue;
|
|
|
|
Scope scope = optional ? QUIET_FAULT_TOLERANT_SCOPE : FAULT_TOLERANT_SCOPE;
|
|
if (e instanceof Class) {
|
|
Key key = Key.get((Class)e);
|
|
resolve((Class)e);
|
|
annotations.put(key,a);
|
|
bind(key).in(scope);
|
|
} else {
|
|
Class extType;
|
|
if (e instanceof Field) {
|
|
extType = ((Field)e).getType();
|
|
} else
|
|
if (e instanceof Method) {
|
|
extType = ((Method)e).getReturnType();
|
|
} else
|
|
throw new AssertionError();
|
|
|
|
resolve(extType);
|
|
|
|
// use arbitrary id to make unique key, because Guice wants that.
|
|
Key key = Key.get(extType, Names.named(String.valueOf(id)));
|
|
annotations.put(key,a);
|
|
bind(key).toProvider(new Provider() {
|
|
public Object get() {
|
|
return instantiate(item);
|
|
}
|
|
}).in(scope);
|
|
}
|
|
} catch (LinkageError e) {
|
|
// sometimes the instantiation fails in an indirect classloading failure,
|
|
// which results in a LinkageError
|
|
LOGGER.log(optional ? Level.FINE : Level.WARNING,
|
|
"Failed to load "+item.className(), e);
|
|
} catch (Exception e) {
|
|
LOGGER.log(optional ? Level.FINE : Level.WARNING,
|
|
"Failed to load "+item.className(), e);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The bootstrap implementation that looks for the {@link Extension} marker.
|
|
*
|
|
* <p>
|
|
* Uses Sezpoz as the underlying mechanism.
|
|
*/
|
|
public static final class Sezpoz extends ExtensionFinder {
|
|
|
|
private volatile List<IndexItem<Extension,Object>> indices;
|
|
|
|
/**
|
|
* Loads indices (ideally once but as few times as possible), then reuse them later.
|
|
* {@link ExtensionList#ensureLoaded()} guarantees that this method won't be called until
|
|
* {@link InitMilestone#PLUGINS_PREPARED} is attained, so this method is guaranteed to
|
|
* see all the classes and indices.
|
|
*/
|
|
private List<IndexItem<Extension,Object>> getIndices() {
|
|
// this method cannot be synchronized because of a dead lock possibility in the following order of events:
|
|
// 1. thread X can start listing indices, locking this object 'SZ'
|
|
// 2. thread Y starts loading a class, locking a classloader 'CL'
|
|
// 3. thread X needs to load a class, now blocked on CL
|
|
// 4. thread Y decides to load extensions, now blocked on SZ.
|
|
// 5. dead lock
|
|
if (indices==null) {
|
|
ClassLoader cl = Jenkins.getInstance().getPluginManager().uberClassLoader;
|
|
indices = ImmutableList.copyOf(Index.load(Extension.class, Object.class, cl));
|
|
}
|
|
return indices;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*
|
|
* <p>
|
|
* SezPoz implements value-equality of {@link IndexItem}, so
|
|
*/
|
|
@Override
|
|
public synchronized ExtensionComponentSet refresh() {
|
|
final List<IndexItem<Extension,Object>> old = indices;
|
|
if (old==null) return ExtensionComponentSet.EMPTY; // we haven't loaded anything
|
|
|
|
final List<IndexItem<Extension, Object>> delta = listDelta(Extension.class,old);
|
|
|
|
List<IndexItem<Extension,Object>> r = Lists.newArrayList(old);
|
|
r.addAll(delta);
|
|
indices = ImmutableList.copyOf(r);
|
|
|
|
return new ExtensionComponentSet() {
|
|
@Override
|
|
public <T> Collection<ExtensionComponent<T>> find(Class<T> type) {
|
|
return _find(type,delta);
|
|
}
|
|
};
|
|
}
|
|
|
|
static <T extends Annotation> List<IndexItem<T,Object>> listDelta(Class<T> annotationType, List<? extends IndexItem<?,Object>> old) {
|
|
// list up newly discovered components
|
|
final List<IndexItem<T,Object>> delta = Lists.newArrayList();
|
|
ClassLoader cl = Jenkins.getInstance().getPluginManager().uberClassLoader;
|
|
for (IndexItem<T,Object> ii : Index.load(annotationType, Object.class, cl)) {
|
|
if (!old.contains(ii)) {
|
|
delta.add(ii);
|
|
}
|
|
}
|
|
return delta;
|
|
}
|
|
|
|
public <T> Collection<ExtensionComponent<T>> find(Class<T> type, Hudson jenkins) {
|
|
return _find(type,getIndices());
|
|
}
|
|
|
|
/**
|
|
* Finds all the matching {@link IndexItem}s that match the given type and instantiate them.
|
|
*/
|
|
private <T> Collection<ExtensionComponent<T>> _find(Class<T> type, List<IndexItem<Extension,Object>> indices) {
|
|
List<ExtensionComponent<T>> result = new ArrayList<ExtensionComponent<T>>();
|
|
|
|
for (IndexItem<Extension,Object> item : indices) {
|
|
try {
|
|
AnnotatedElement e = item.element();
|
|
Class<?> extType;
|
|
if (e instanceof Class) {
|
|
extType = (Class) e;
|
|
} else
|
|
if (e instanceof Field) {
|
|
extType = ((Field)e).getType();
|
|
} else
|
|
if (e instanceof Method) {
|
|
extType = ((Method)e).getReturnType();
|
|
} else
|
|
throw new AssertionError();
|
|
|
|
if(type.isAssignableFrom(extType)) {
|
|
Object instance = item.instance();
|
|
if(instance!=null)
|
|
result.add(new ExtensionComponent<T>(type.cast(instance),item.annotation()));
|
|
}
|
|
} catch (LinkageError e) {
|
|
// sometimes the instantiation fails in an indirect classloading failure,
|
|
// which results in a LinkageError
|
|
LOGGER.log(logLevel(item), "Failed to load "+item.className(), e);
|
|
} catch (Exception e) {
|
|
LOGGER.log(logLevel(item), "Failed to load "+item.className(), e);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
@Override
|
|
public void scout(Class extensionType, Hudson hudson) {
|
|
for (IndexItem<Extension,Object> item : getIndices()) {
|
|
try {
|
|
// we might end up having multiple threads concurrently calling into element(),
|
|
// but we can't synchronize this --- if we do, the one thread that's supposed to load a class
|
|
// can block while other threads wait for the entry into the element call().
|
|
// looking at the sezpoz code, it should be safe to do so
|
|
AnnotatedElement e = item.element();
|
|
Class<?> extType;
|
|
if (e instanceof Class) {
|
|
extType = (Class) e;
|
|
} else
|
|
if (e instanceof Field) {
|
|
extType = ((Field)e).getType();
|
|
} else
|
|
if (e instanceof Method) {
|
|
extType = ((Method)e).getReturnType();
|
|
} else
|
|
throw new AssertionError();
|
|
// according to http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6459208
|
|
// this appears to be the only way to force a class initialization
|
|
Class.forName(extType.getName(),true,extType.getClassLoader());
|
|
} catch (Exception e) {
|
|
LOGGER.log(logLevel(item), "Failed to scout "+item.className(), e);
|
|
} catch (LinkageError e) {
|
|
LOGGER.log(logLevel(item), "Failed to scout "+item.className(), e);
|
|
}
|
|
}
|
|
}
|
|
|
|
private Level logLevel(IndexItem<Extension, Object> item) {
|
|
return item.annotation().optional() ? Level.FINE : Level.WARNING;
|
|
}
|
|
}
|
|
|
|
private static final Logger LOGGER = Logger.getLogger(ExtensionFinder.class.getName());
|
|
}
|