java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at weblogic.utils.io.FilenameEncoder.resolveRelativePath(FilenameEncoder.java:255)
at weblogic.utils.io.FilenameEncoder.resolveRelativeURIPath(FilenameEncoder.java:244)
at weblogic.utils.io.FilenameEncoder.resolveRelativeURIPath(FilenameEncoder.java:238)
at weblogic.servlet.internal.WarClassFinder.getSource(WarClassFinder.java:133)
at weblogic.servlet.internal.WebAppServletContext.getSource(WebAppServletContext.java:4584)
at weblogic.servlet.internal.WebAppServletContext.getResourceAsSource(WebAppServletContext.java:6357)
at com.sun.identity.authentication.spi.AMModuleProperties.(AMModuleProperties.java:93)
at com.sun.identity.authentication.spi.AMModuleProperties.getModuleProperties(AMModuleProperties.java:156)
at com.sun.identity.authentication.spi.AMLoginModule.getCallback(AMLoginModule.java:418)
at com.sun.identity.authentication.spi.AMLoginModule.login(AMLoginModule.java:778)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.identity.authentication.jaas.LoginContext.invoke(LoginContext.java:215)
at com.sun.identity.authentication.jaas.LoginContext.login(LoginContext.java:132)
at com.sun.identity.authentication.service.AMLoginContext.runLogin(AMLoginContext.java:384)
at com.sun.identity.authentication.service.AMLoginContext.executeLogin(AMLoginContext.java:351)
at com.sun.identity.authentication.server.AuthContextLocal.login(AuthContextLocal.java:322)
at com.sun.identity.authentication.server.AuthContextLocal.login(AuthContextLocal.java:242)
at com.sun.identity.authentication.UI.LoginViewBean.getLoginDisplay(LoginViewBean.java:738)
at com.sun.identity.authentication.UI.LoginViewBean.processLogin(LoginViewBean.java:694)
at com.sun.identity.authentication.UI.LoginViewBean.forwardTo(LoginViewBean.java:411)
at com.iplanet.jato.ApplicationServletBase.dispatchRequest(ApplicationServletBase.java:981)
at com.iplanet.jato.ApplicationServletBase.processRequest(ApplicationServletBase.java:615)
at com.iplanet.jato.ApplicationServletBase.doGet(ApplicationServletBase.java:459)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1006)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)

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