Web Service

Hi all,

I have created a webservice out of an application service which is getting data from a BAPI . I have used that webservice in webdynpro application and it worked fine . But suddenly we are unable to retreive data.

When i am testing the webservice it is givng the following exception :

" I/O operation failed : java.lang.ClassNotFoundException: com.sap.mw.jco.JCO$Exception

Found in negative cache".

Kindly help me..