i'm trying to deploy a standalone aop component into the jboss server. the aop component is to be applied to a deployed war component. i'm interested in changing the aop component, and redeploying only that, to dynamically change the behavior of the war at runtime. basically, i'd like to add and remove an "insteadof" aspect to some servlets.

i created a .jar file with the contents of:

jboss-aop.xml
org/eclipse/wtp/tutorial/ServletBypassInterceptor.class
org/eclipse/wtp/tutorial/SimpleInterceptor.class

perhaps there's a step or something that i'm just missing. it seemed to deploy fine the first time, but when i changed the jboss-aop.xml to use the ByPassInterceptor class instead of the SimpleInterceptor, i get the following exception:

06:47:11,906 ERROR [AspectDeployer] failed to stop
java.lang.RuntimeException: java.lang.RuntimeException: java.lang.NullPointerException
 at org.jboss.aop.ClassAdvisor.rebuildInterceptors(ClassAdvisor.java:802)
 at org.jboss.aop.ClassAdvisor.removeAdviceBindings(ClassAdvisor.java:360)
 at org.jboss.aop.AspectManager.removeBindings(AspectManager.java:1107)
 at org.jboss.aop.AspectXmlLoader.bulkUndeploy(AspectXmlLoader.java:992)
 at org.jboss.aop.AspectXmlLoader.undeployXML(AspectXmlLoader.java:983)
 at org.jboss.aop.AspectXmlLoader.undeploy(AspectXmlLoader.java:1099)
 at org.jboss.aop.AspectXmlLoader.undeployXML(AspectXmlLoader.java:1128)
 at org.jboss.aop.deployment.AspectDeployer.stop(AspectDeployer.java:199)
 at org.jboss.deployment.MainDeployer.stop(MainDeployer.java:632)
 at org.jboss.deployment.MainDeployer.stop(MainDeployer.java:624)
 at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:605)
 at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:600)
 at org.jboss.deployment.MainDeployer.undeploy(MainDeployer.java:573)
 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:585)
 at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
 at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
 at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:121)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
 at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:127)
 at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
 at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
 at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
 at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
 at $Proxy8.undeploy(Unknown Source)
 at org.jboss.deployment.scanner.URLDeploymentScanner.undeploy(URLDeploymentScanner.java:355)
 at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:477)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:204)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:215)
 at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:194)
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
 at org.jboss.aop.pointcut.Util.matchesClassExpr(Util.java:95)
 at org.jboss.aop.pointcut.MethodMatcher.matches(MethodMatcher.java:86)
 at org.jboss.aop.pointcut.MethodMatcher.visit(MethodMatcher.java:66)
 at org.jboss.aop.pointcut.ast.ASTMethod.jjtAccept(ASTMethod.java:23)
 at org.jboss.aop.pointcut.ExecutionMethodMatcher.visit(ExecutionMethodMatcher.java:43)
 at org.jboss.aop.pointcut.ast.ASTExecution.jjtAccept(ASTExecution.java:17)
 at org.jboss.aop.pointcut.MatcherHelper.visit(MatcherHelper.java:72)
 at org.jboss.aop.pointcut.MatcherHelper.matches(MatcherHelper.java:67)
 at org.jboss.aop.pointcut.PointcutExpression.matchesExecution(PointcutExpression.java:104)
 at org.jboss.aop.Advisor.resolveMethodPointcut(Advisor.java:539)
 at org.jboss.aop.ClassAdvisor.createInterceptorChains(ClassAdvisor.java:458)
 at org.jboss.aop.ClassAdvisor.rebuildInterceptors(ClassAdvisor.java:797)
 ... 31 more
Caused by: java.lang.NullPointerException
 at org.jboss.aop.pointcut.Util.matchesTypedef(Util.java:309)
 at org.jboss.aop.pointcut.Util.matchesClassExpr(Util.java:86)
 ... 42 more

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<aop>
 <typedef name="TestServlets" expr="class($instanceof{javax.servlet.http.HttpServlet}) AND class(org.eclipse.wtp.tutorial.*)"/>

 <!--
 <bind pointcut="execution(* $typedef{TestServlets}->*(..))">
 <interceptor class="org.eclipse.wtp.tutorial.SimpleInterceptor"/>
 </bind>
 -->

 <bind pointcut="execution(* $typedef{TestServlets}->*(..))">
 <interceptor class="org.eclipse.wtp.tutorial.ServletBypassInterceptor"/>
 </bind>
</aop>