Work around getSystemClassloader call for compatibility with GAE
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Key: WW-3114
URL: https://issues.apache.org/struts/browse/WW-3114
Project: Struts 2
Issue Type: Improvement
Components: Plugin - Convention
Affects Versions: 2.1.7
Reporter: Leonard Broman
The Google App Engine sandbox does not allow application to access the system
classloader using the ClassLoader.getSystemClassLoader() accessor. The
convention plugin uses this to exclude urls to scan in
PackageBasedActionConfigBuilder.java.
Due to this, convention plugin is not functioning properly in the GAE sandbox.
Stacktrace from app engine:
com.opensymphony.xwork2.util.logging.jdk.JdkLogger error: Unable to scan named
packages
java.security.AccessControlException: access denied
(java.lang.RuntimePermission getClassLoader)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.ClassLoader.getSystemClassLoader(Unknown Source)
at
org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildUrlSet(PackageBasedActionConfigBuilder.java:324)
at
org.apache.struts2.convention.PackageBasedActionConfigBuilder.findActions(PackageBasedActionConfigBuilder.java:295)
at
org.apache.struts2.convention.PackageBasedActionConfigBuilder.buildActionConfigs(PackageBasedActionConfigBuilder.java:277)
at
org.apache.struts2.convention.ClasspathPackageProvider.loadPackages(ClasspathPackageProvider.java:52)
at
com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:200)
at
com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:55)
at
org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:360)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:403)
at
org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:190)
at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:99)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
at
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:589)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:139)
at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218)
at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500)
at
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:190)
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:167)
at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:113)
at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235)
at
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4547)
at
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4545)
at
com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:359)
at com.google.net.rpc.impl.Server$2.run(Server.java:792)
at
com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
at
com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:489)
at com.google.net.rpc.impl.Server.startRpc(Server.java:748)
at com.google.net.rpc.impl.Server.processRequest(Server.java:340)
at
com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:422)
at
com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319)
at
com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290)
at com.google.net.async.Connection.handleReadEvent(Connection.java:419)
at
com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:733)
at
com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207)
at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101)
at
com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:249)
at
com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:373)
at java.lang.Thread.run(Unknown Source)
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