U R G E N T : funny Exception by SOAP-call

Hello

I 've got  trouble with calling RPCs via SOAP
usually I know what to do, but this error-Message (Exception) I never had
and don't know what is going wrong.
I allready restated Tomcat but the result stays the same.
And here is the Exeption:

SOAP-RPC:[Attributes={}] [faultCode=SOAP-ENV:Server.Exception:]
[faultString=javax/jnlp/BasicService]
[faultActorURI=/soap/servlet/rpcrouter] [DetailEntries=
[(0)=<stackTrace>java.lang.NoClassDefFoundError: javax/jnlp/BasicService 	at
de.mc.etnbestterm.server.BesttermServer.&amp;lt;init&amp;gt;(BesttermServer.
java:98) 	at java.lang.Class.newInstance0(Native Method) 	at
java.lang.Class.newInstance(Class.java:237) 	at
org.apache.soap.server.http.ServerHTTPUtils.getTargetObject(Unknown Source)
at org.apache.soap.providers.RPCJavaProvider.locate(Unknown Source) 	at
org.apache.soap.server.http.RPCRouterServlet.doPost(Unknown Source) 	at
javax.servlet.http.HttpServlet.service(HttpServlet.java:760) 	at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853) 	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:247) 	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:193) 	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:243) 	at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66) 	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.StandardContextValve.invoke(StandardContextValve.ja
va:190) 	at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66) 	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.StandardContext.invoke(StandardContext.java:2347)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180
) 	at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66) 	at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.
java:170) 	at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64) 	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170
) 	at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64) 	at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64) 	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
:174) 	at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66) 	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:
1027) 	at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125
) 	at java.lang.Thread.run(Thread.java:484) </stackTrace>] ] [FaultEntries=]
Fault Code=SOAP-ENV:Server.Exception:
SOAP-RPC-Fehler:javax/jnlp/BasicService

can anybody give me a hint?

Thanks a lot in advance

Malte