javagoogle/guice #1049Not a task: already works

[OSGi] Multibindings and AssistedInject JARs need version property for fragment host

envgap__google__guice-1049

Original GitHub issue ↗Dated source checkout ↗Opened 2016-09-29

01 / FAILURE SIGNATURE

As reported upstream

java.lang.LinkageError: loader constraint violation: loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) previously initiated loading for a different type with name "com/google/inject/Binder"

Not a benchmark task.

The project already builds and runs before the fix, so there is nothing to repair.

02 / ENVIRONMENT RECIPE

Base commit: e68fab652406b0d85bf294afe8cb9930ac9e6d42
Manifest: extensions/pom.xml
Reproduce: Awaiting issue-specific recipe
Run under trace: Awaiting a meaningful runtime command

03 / ORIGINAL ISSUE TEXT

google/guice #1049 · read the original issue

The libraries "guice-multibindings" and "guice-assistedinject" are implemented as OSGi fragements for the "com.google.inject" bundle.
If two versions (e.g. 3.0.0 and 4.0.0) of Guice are used within the same OSGi container (Eclipse Equinox) then the following exception occurs:

> java.lang.LinkageError: loader constraint violation: loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) previously initiated loading for a different type with name "com/google/inject/Binder"
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(Unknown Source)
> at org.eclipse.osgi.internal.loader.ModuleClassLoader.defineClass(ModuleClassLoader.java:273)
> at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.defineClass(ClasspathManager.java:632)
> at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findClassImpl(ClasspathManager.java:586)
> at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClassImpl(ClasspathManager.java:538)
> at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:525)
> at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:325)
> at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:334)
> at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:411)
> at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:361)
> at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:353)
> at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:161)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at com.google.inject.multibindings.Multibinder.newRealSetBinder(Multibinder.java:176)
> at com.google.inject.multibindings.Multibinder.newSetBinder(Multibinder.java:132)

I think this is due to the following line within the MANIFEST.MF of each bundle:

> Fragment-Host: com.google.inject

The Fragment-Host should not only specify the host bundle but also its version:

> Fragment-Host: com.google.inject;bundle-version=4.0.0

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