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java.lang.NullPointerException: 	at oracle.spatial.wfs.VersionNegotiation.validateVersionString(VersionNegotiation.java:339)	at oracle.spatial.wfs.VersionNegotiation.negotiateVersion(VersionNegotiation.java:217)	at oracle.spatial.wfs.VersionNegotiation.negotiateVersion(VersionNegotiation.java:169)	at oracle.spatial.wfs.GetCapabilitiesProcess.generateGetCapabilitiesRoot(GetCapabilitiesProcess.java:150)	at oracle.spatial.wfs.GetCapabilitiesProcess.execute(GetCapabilitiesProcess.java:119)	at oracle.spatial.wfs.WFSProcessor.processDB(WFSProcessor.java:2681)	at oracle.spatial.wfs.WFSProcessor.processWFSRequest(WFSProcessor.java:7995)	at oracle.spatial.wfs.WFSHandler.makeSpatialRequest(WFSHandler.java:103)	at oracle.spatial.ws.svrproxy.SdoWsMultiplexer.invokeHandler(SdoWsMultiplexer.java:202)	at oracle.spatial.ws.svrproxy.SdoWsXmlServlet.doPost(SdoWsXmlServlet.java:106)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3594)	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)	at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2202)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2108)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1432)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)