Failing to run TeamCity Sonar Runner with reverse-proxy-auth-sonar plugin

[optomos]

I upgraded to version 6.0.2.52 and i'm still getting this when trying to run Sonar from TeamCity:

ERROR: Error during Sonar runner execution

[00:50:42]org.sonar.runner.impl.RunnerException: Unable to execute Sonar

[00:50:42] at org.sonar.runner.impl.BatchLauncher$1.delegateExecution(BatchLauncher.java:91)

[00:50:42] at org.sonar.runner.impl.BatchLauncher$1.run(BatchLauncher.java:75)

[00:50:42] at java.security.AccessController.doPrivileged(Native Method)

[00:50:42] at org.sonar.runner.impl.BatchLauncher.doExecute(BatchLauncher.java:69)

[00:50:42] at org.sonar.runner.impl.BatchLauncher.execute(BatchLauncher.java:50)

[00:50:42] at org.sonar.runner.api.EmbeddedRunner.doExecute(EmbeddedRunner.java:102)

[00:50:42] at org.sonar.runner.api.Runner.execute(Runner.java:100)

[00:50:42] at org.sonar.runner.Main.executeTask(Main.java:70)

[00:50:42] at org.sonar.runner.Main.execute(Main.java:59)

[00:50:42] at org.sonar.runner.Main.main(Main.java:53)

[00:50:42]Caused by: java.lang.NoClassDefFoundError: javax/servlet/Filter

[00:50:42] at java.lang.ClassLoader.defineClass1(Native Method)

[00:50:42] at java.lang.ClassLoader.defineClass(ClassLoader.java:763)

[00:50:42] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

[00:50:42] at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)

[00:50:42] at java.net.URLClassLoader.access$100(URLClassLoader.java:73)

[00:50:42] at java.net.URLClassLoader$1.run(URLClassLoader.java:368)

[00:50:42] at java.net.URLClassLoader$1.run(URLClassLoader.java:362)

[00:50:42] at java.security.AccessController.doPrivileged(Native Method)

[00:50:42] at java.net.URLClassLoader.findClass(URLClassLoader.java:361)

[00:50:42] at org.sonar.runner.impl.IsolatedClassloader.loadClass(IsolatedClassloader.java:94)

[00:50:42] at java.lang.ClassLoader.loadClass(ClassLoader.java:411)

[00:50:42] at org.sonar.classloader.ClassRealm.loadClass(ClassRealm.java:84)

[00:50:42] at org.sonar.classloader.ClassRealm.loadClass(ClassRealm.java:76)

[00:50:42] at org.sonar.classloader.DefaultClassloaderRef.loadClassIfPresent(DefaultClassloaderRef.java:40)

[00:50:42] at org.sonar.classloader.ClassRealm.loadClassFromParent(ClassRealm.java:147)

[00:50:42] at org.sonar.classloader.ParentFirstStrategy.loadClass(ParentFirstStrategy.java:35)

[00:50:42] at org.sonar.classloader.ClassRealm.loadClass(ClassRealm.java:87)

[00:50:42] at org.sonar.classloader.ClassRealm.loadClass(ClassRealm.java:76)

[00:50:42] at java.lang.ClassLoader.defineClass1(Native Method)

[00:50:42] at java.lang.ClassLoader.defineClass(ClassLoader.java:763)

[00:50:42] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

[00:50:42] at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)

[00:50:42] at java.net.URLClassLoader.access$100(URLClassLoader.java:73)

[00:50:42] at java.net.URLClassLoader$1.run(URLClassLoader.java:368)

[00:50:42] at java.net.URLClassLoader$1.run(URLClassLoader.java:362)

[00:50:42] at java.security.AccessController.doPrivileged(Native Method)

[00:50:42] at java.net.URLClassLoader.findClass(URLClassLoader.java:361)

[00:50:42] at org.sonar.classloader.ClassRealm.loadClassFromSelf(ClassRealm.java:125)

[00:50:42] at org.sonar.classloader.ParentFirstStrategy.loadClass(ParentFirstStrategy.java:37)

[00:50:42] at org.sonar.classloader.ClassRealm.loadClass(ClassRealm.java:87)

[00:50:42] at org.sonar.classloader.ClassRealm.loadClass(ClassRealm.java:76)

[00:50:42] at net.trajano.sonar.plugins.reverseproxyauth.ReverseProxyAuthPlugin.define(ReverseProxyAuthPlugin.java:37)

[00:50:42] at org.sonar.scanner.bootstrap.ExtensionInstaller.install(ExtensionInstaller.java:55)

[00:50:42] at org.sonar.scanner.task.TaskContainer.addTaskExtensions(TaskContainer.java:62)

[00:50:42] at org.sonar.scanner.task.TaskContainer.doBeforeStart(TaskContainer.java:49)

[00:50:42] at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:141)

[00:50:42] at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:128)

[00:50:42] at org.sonar.scanner.bootstrap.GlobalContainer.executeTask(GlobalContainer.java:118)

[00:50:42] at org.sonar.batch.bootstrapper.Batch.executeTask(Batch.java:117)

[00:50:42] at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:77)

[00:50:42] at org.sonar.runner.batch.IsolatedLauncher.execute(IsolatedLauncher.java:48)

[00:50:42] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[00:50:42] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

[00:50:42] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

[00:50:42] at java.lang.reflect.Method.invoke(Method.java:498)

[00:50:42] at org.sonar.runner.impl.BatchLauncher$1.delegateExecution(BatchLauncher.java:87)

[00:50:42] ... 9 more

[00:50:42]Caused by: java.lang.ClassNotFoundException: javax.servlet.Filter

[00:50:42] at java.net.URLClassLoader.findClass(URLClassLoader.java:381)

[00:50:42] at org.sonar.runner.impl.IsolatedClassloader.loadClass(IsolatedClassloader.java:94)

[00:50:42] at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

[00:50:42] ... 55 more

[00:50:42]Process exited with code 1

If I remove the plugin and sonar.security.realm=reverseproxyauth from the sonar.properties, it works.