Gerrit 2.9.1: Replication Plugin throws Exception during installation

[Matthew Jordan]

Hello!

I've recently set up and installed a Gerrit server. Upon installing the replication plugin, the Gerrit server throws the following Exception:

[2015-03-25 20:34:55,924] WARN  com.google.gerrit.server.plugins.PluginLoader : Cannot load plugin replication
java.lang.NoClassDefFoundError: com/google/gerrit/server/events/Event

I tried a few different methods of installation, in case it was somehow related to an SSH permission issue:

ssh -p PORT USER@SERVER gerrit plugin install -n replication.jar - < replication.jar
com.google.gerrit.server.plugins.PluginInstallException: com/google/gerrit/server/events/Event
    at com.google.gerrit.server.plugins.PluginLoader.runPlugin(PluginLoader.java:442)
fatal: Plugin failed to install. Cause: com/google/gerrit/server/events/Event

Loading it manually on the server in the plugins directory resulted in the same exception in the logs:

[2015-03-25 20:34:55,924] WARN  com.google.gerrit.server.plugins.PluginLoader : Cannot load plugin replication
java.lang.NoClassDefFoundError: com/google/gerrit/server/events/Event

Gerrit version: 2.9.1
Replication: build from source (gerrit stable-2.9, replication stable-2.9)

Full stack trace is below:

com.google.gerrit.server.plugins.PluginInstallException: com/google/gerrit/server/events/Event
    at com.google.gerrit.server.plugins.PluginLoader.runPlugin(PluginLoader.java:442)
    at com.google.gerrit.server.plugins.PluginLoader.installPluginFromStream(PluginLoader.java:184)
    at com.google.gerrit.sshd.commands.PluginInstallCommand.run(PluginInstallCommand.java:98)
    at com.google.gerrit.sshd.SshCommand$1.run(SshCommand.java:35)
    at com.google.gerrit.sshd.BaseCommand$TaskThunk.run(BaseCommand.java:442)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
    at com.google.gerrit.server.git.WorkQueue$Task.run(WorkQueue.java:364)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.NoClassDefFoundError: com/google/gerrit/server/events/Event
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2413)
    at java.lang.Class.getDeclaredConstructors(Class.java:1855)
    at com.google.inject.spi.InjectionPoint.forConstructorOf(InjectionPoint.java:245)
    at com.google.inject.internal.ConstructorBindingImpl.create(ConstructorBindingImpl.java:99)
    at com.google.inject.internal.InjectorImpl.createUninitializedBinding(InjectorImpl.java:661)
    at com.google.inject.internal.InjectorImpl.createJustInTimeBinding(InjectorImpl.java:871)
    at com.google.inject.internal.InjectorImpl.createJustInTimeBindingRecursive(InjectorImpl.java:798)
    at com.google.inject.internal.InjectorImpl.getJustInTimeBinding(InjectorImpl.java:286)
    at com.google.inject.internal.InjectorImpl.getBindingOrThrow(InjectorImpl.java:218)
    at com.google.inject.internal.InjectorImpl.getProviderOrThrow(InjectorImpl.java:994)
    at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:1027)
    at com.google.inject.internal.InjectorImpl.getProvider(InjectorImpl.java:990)
    at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1040)
    at com.google.gerrit.server.plugins.JarPlugin.startPlugin(JarPlugin.java:144)
    at com.google.gerrit.server.plugins.JarPlugin.start(JarPlugin.java:127)
    at com.google.gerrit.server.plugins.PluginLoader.runPlugin(PluginLoader.java:425)
    ... 13 more
Caused by: java.lang.ClassNotFoundException: com.google.gerrit.server.events.Event
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    ... 30 more
fatal: Plugin failed to install. Cause: com/google/gerrit/server/events/Event

Any help would be appreciated - thanks!

[David Pursehouse]

It looks like you're using the plugin from a later version of gerrit.

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[Matthew Jordan]

On Thursday, March 26, 2015 at 3:28:51 AM UTC-5, David Pursehouse wrote:

It looks like you're using the plugin from a later version of gerrit.

Ugh. Error between keyboard and screen was indeed the case. Apparently I wasn't *actually* on origin/stable-2.9 on the plugin branch. Correcting that and re-installing fixed the replication issues.

Thanks a lot for the help!