just start jboss after jbpm is installed on it and look at the console to see the exception

[start-jboss] 15:17:28,985 DEBUG [NamingBeanImpl] key=java.naming.factory.initial, value(java.lang.String)=org.jnp.interfaces.NamingContextFactory
[start-jboss] 15:17:28,985 DEBUG [NamingBeanImpl] key=java.naming.factory.url.pkgs, value(java.lang.String)=org.jboss.naming:org.jnp.interfaces
[start-jboss] 15:17:45,110 INFO [NativeServerConfig] JBoss Web Services - Stack Native Core
[start-jboss] 15:17:45,110 INFO [NativeServerConfig] 3.0.4.SP1
[start-jboss] 15:17:52,767 WARN [AbstractDeploymentContext] Unable to register deployment mbean vfszip:/C:/Software/jbpm-4.3-SNAPSHOT/jboss-5.0.0.GA/server/default/deploy/jbpm/jbpm-service.sar/core.jar/jdtCompilerAdapter.jar
[start-jboss] javax.management.InstanceAlreadyExistsException: jboss.deployment:id="vfszip:/C:/Software/jbpm-4.3-SNAPSHOT/jboss-5.0.0.GA/server/default/deploy/jbpm/jbpm-service.sar/core.jar/jdtCompilerAdapter.jar",type=SubDeployment already registered.
[start-jboss] at org.jboss.mx.server.registry.BasicMBeanRegistry.add(BasicMBeanRegistry.java:767)
[start-jboss] at org.jboss.mx.server.registry.BasicMBeanRegistry.registerMBean(BasicMBeanRegistry.java:236)
[start-jboss] at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
[start-jboss] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[start-jboss] at java.lang.reflect.Method.invoke(Method.java:585)
[start-jboss] at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
[start-jboss] at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
[start-jboss] at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:138)
[start-jboss] at org.jboss.mx.server.Invocation.invoke(Invocation.java:90)
[start-jboss] at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:140)
[start-jboss] at org.jboss.mx.server.Invocation.invoke(Invocation.java:90)
[start-jboss] at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
[start-jboss] at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
[start-jboss] at org.jboss.mx.server.MBeanServerImpl$3.run(MBeanServerImpl.java:1431)
[start-jboss] at java.security.AccessController.doPrivileged(Native Method)
[start-jboss] at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:1426)
[start-jboss] at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:376)
[start-jboss] at org.jboss.deployers.structure.spi.helpers.AbstractDeploymentContext.registerMBeans(AbstractDeploymentContext.java:989)
[start-jboss] at org.jboss.deployers.structure.spi.helpers.AbstractDeploymentContext.registerMBeans(AbstractDeploymentContext.java:998)
[start-jboss] at org.jboss.deployers.structure.spi.helpers.AbstractDeploymentContext.registerMBeans(AbstractDeploymentContext.java:998)
[start-jboss] at org.jboss.deployers.structure.spi.helpers.AbstractDeploymentContext.postRegister(AbstractDeploymentContext.java:964)
[start-jboss] at org.jboss.mx.server.AbstractMBeanInvoker.invokePostRegister(AbstractMBeanInvoker.java:974)
[start-jboss] at org.jboss.mx.server.AbstractMBeanInvoker.postRegister(AbstractMBeanInvoker.java:681)
[start-jboss] at org.jboss.mx.server.registry.BasicMBeanRegistry.registerMBean(BasicMBeanRegistry.java:338)
[start-jboss] at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
[start-jboss] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[start-jboss] at java.lang.reflect.Method.invoke(Method.java:585)
[start-jboss] at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
[start-jboss] at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
[start-jboss] at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:138)
[start-jboss] at org.jboss.mx.server.Invocation.invoke(Invocation.java:90)
[start-jboss] at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:140)
[start-jboss] at org.jboss.mx.server.Invocation.invoke(Invocation.java:90)
[start-jboss] at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
[start-jboss] at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
[start-jboss] at org.jboss.mx.server.MBeanServerImpl$3.run(MBeanServerImpl.java:1431)
[start-jboss] at java.security.AccessController.doPrivileged(Native Method)
[start-jboss] at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:1426)
[start-jboss] at org.jboss.mx.server.MBeanServerImpl.registerMBean(MBeanServerImpl.java:376)
[start-jboss] at org.jboss.deployers.plugins.deployers.DeployersImpl.registerMBean(DeployersImpl.java:1602)
[start-jboss] at org.jboss.deployers.plugins.deployers.DeployersImpl.process(DeployersImpl.java:755)
[start-jboss] at org.jboss.deployers.plugins.main.MainDeployerImpl.process(MainDeployerImpl.java:545)
[start-jboss] at org.jboss.system.server.profileservice.ProfileServiceBootstrap.loadProfile(ProfileServiceBootstrap.java:304)
[start-jboss] at org.jboss.system.server.profileservice.ProfileServiceBootstrap.start(ProfileServiceBootstrap.java:205)
[start-jboss] at org.jboss.bootstrap.AbstractServerImpl.start(AbstractServerImpl.java:405)
[start-jboss] at org.jboss.Main.boot(Main.java:209)
[start-jboss] at org.jboss.Main$1.run(Main.java:547)
[start-jboss] at java.lang.Thread.run(Thread.java:595)