JBuilde, JBoss

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Hi allemaal,
Ik heb JBuilder, JBoss en Tomcat geinstalleerd en geconfigurereed en werkt perfect, maar toen ik [url="http://localhost:8080"]http://localhost:8080[/url] wil openen dan verschijt volgende foutmeldingen.

In de browser:
HTTP Status 500 - No Context configured to process this request

en in JBuilder volgende foutmelding:

[ERROR,EmbeddedCatalinaServiceSX] HttpProcessor[8080][4] process.invoke
java.lang.NullPointerException
at org.apache.catalina.valves.ErrorDispatcherValve.status(ErrorDispatcherValve.java:280)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)[INFO,EmbeddedCatalinaServiceSX] StandardHost[localhost]: MAPPING configuration error for request URI

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1011)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1106)
at java.lang.Thread.run(Thread.java:484)

Kan iemand mij helpen?
tnx