After upgrading my test app to version 5.3.0, I'm now getting the following
error. 

java.lang.IncompatibleClassChangeError: Implementing class
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at
org.mortbay.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:392)
        at
org.mortbay.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:363)
        at
org.apache.tapestry5.internal.ServletContextSymbolProvider.<init>(ServletContextSymbolProvider.java:33)
        at org.apache.tapestry5.TapestryFilter.init(TapestryFilter.java:86)
        at
org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713)
        at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
        at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
        at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
        at
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
        at
org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:115)
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
        at
org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at
org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
        at org.mortbay.jetty.Server.doStart(Server.java:224)
        at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at
org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer.java:132)
        at
org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:454)
        at
org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:396)
        at
org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:210)
        at
org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184)
        at
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:107)
        at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:195)
        at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:148)
        at
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:140)
        at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at
org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:314)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:151)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:445)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:168)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:132)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
        at
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
        at
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
        at
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)

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