I sometimes get this error on starting up JBoss-3.2.0. Can somebody help?

java.lang.ClassCircularityError: java/lang/NumberFormatException
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:1590)
at java.lang.Class.getConstructor0(Class.java:1762)
at java.lang.Class.newInstance0(Class.java:276)
at java.lang.Class.newInstance(Class.java:259)
at org.jboss.resource.connectionmanager.RARDeployment.startService(RARDeployment.java:533)
at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:192)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:966)
at $Proxy11.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:392)
at org.jboss.system.ServiceController.start(ServiceController.java:408)
at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy5.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:242)
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:324)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.mx.util.JMXInvocationHandler.invoke(JMXInvocationHandler.java:177)
at $Proxy19.start(Unknown Source)
at org.jboss.deployment.XSLSubDeployer.start(XSLSubDeployer.java:220)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:832)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:640)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:613)
at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy7.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:280)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:421)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:200)
at org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:273)
at org.jboss.system.ServiceMBeanSupport.start(ServiceMBeanSupport.java:192)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:966)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:392)
at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy5.start(Unknown Source)
at org.jboss.deployment.SARDeployer.start(SARDeployer.java:242)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:832)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:640)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:613)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:597)
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:324)
at org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy6.deploy(Unknown Source)
at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:361)
at org.jboss.system.server.ServerImpl.start(ServerImpl.java:268)
at org.jboss.Main.boot(Main.java:156)
at org.jboss.Main$1.run(Main.java:394)
at java.lang.Thread.run(Thread.java:536)