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Re: [tycho-user] Help debug classloader conflict loading plugin in standalone instance (not in launch config instance)?
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On 04/20/2016 12:12 PM, David M. Karr wrote:
I'm working on an eclipse plugin codebase that uses Tycho to build
itself. The application requires several artifacts that aren't
available in a p2 repo. To resolve this, I created one plugin project
whose only purpose is to use the "copy-dependencies" goal from the
"maven-dependency-plugin" to specify the artifacts that are needed and
make them available in the "Bundle-ClassPath" property of the same
plugin. I then set other plugins that require these libraries to
depend on this plugin.
This had been working fine, although there was one point where I saw
the following error after installing the plugin from a local update
site constructed from the build:
java.lang.LinkageError: org/antlr/v4/runtime/TokenStream
After some fiddling, this went away, although I wasn't certain exactly
what I did to make it go away.
I'm aware of the fact that this indicates a conflict with loading a
class from multiple classloaders.
Today, this error came back.
Curiously, if I instead test this with an "Eclipse Application" run
configuration, loading all plugins in the workspace, I don't see the
error.
I changed the command line of the Eclipse instance (not the one from
the launch configuration) to add "-verbose:class" to see where this is
loaded from. I extracted the following relevant lines from the output:
----------------------
[Loaded org.antlr.v4.runtime.TokenStream from
file:/home/opnfv/frameworks/eclipse-neon/java-mars/eclipse/../../../../.p2/pool/plugins/net.sf.eclipsecs.checkstyle_6.16.0.201603042321/checkstyle-6.16.1-all.jar]
[Loaded org.antlr.v4.runtime.TokenStream from
file:/home/opnfv/frameworks/eclipse-neon/java-mars/eclipse/configuration/org.eclipse.osgi/605/0/.cp/libs/antlr4-runtime-4.5.1.jar]
java.lang.LinkageError: loader constraint violation: loader (instance
of org/eclipse/osgi/internal/loader/EquinoxClassLoader) previously
initiated loading for a different type with name
"org/antlr/v4/runtime/TokenStream"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at
org.eclipse.osgi.internal.loader.ModuleClassLoader.defineClass(ModuleClassLoader.java:272)[Loaded
com.google.common.collect.Collections2$FilteredCollection from
file:/home/opnfv/frameworks/eclipse-neon/java-mars/eclipse/../../../../.p2/pool/plugins/com.google.guava_15.0.0.v201403281430.jar]
at
org.eclipse.osgi.internal.loader.classpath.ClasspathManager.defineClass(ClasspathManager.java:632)
at
org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findClassImpl(ClasspathManager.java:588)
at
org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClassImpl(ClasspathManager.java:540)
at
org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:527)
at
org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)
at
org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:327)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:402)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:352)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:344)
at
org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.antlr.v4.runtime.Parser.setInputStream(Parser.java:530)
-----------------
I could use some ideas or suggestions for troubleshooting and fixing
this.
If it matters, I'm adding more details in a SO posting, at
http://stackoverflow.com/questions/36798891/loader-constraint-violation-loading-antlr-jar-in-eclipse-plugin-built-with-tycho
.
