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java.lang.NullPointerException: 	at weblogic.xml.crypto.dsig.XMLSignatureImpl.getNextSibling(XMLSignatureImpl.java:307)	at weblogic.xml.crypto.dsig.XMLSignatureImpl.unmarshal(XMLSignatureImpl.java:289)	at weblogic.xml.crypto.dsig.XMLSignatureImpl.(XMLSignatureImpl.java:93)	at weblogic.xml.crypto.dsig.XMLSignatureFactoryImpl.unmarshalXMLSignature(XMLSignatureFactoryImpl.java:144)	at org.opensaml.SAMLSignedObject.verify(SAMLSignedObject.java:413)	at org.opensaml.SAMLSignedObject.verify(SAMLSignedObject.java:375)	at weblogic.security.providers.saml.SAMLAssert.verifySignature(SAMLAssert.java:724)	at weblogic.security.providers.saml.SAMLAssert.assertToken(SAMLAssert.java:199)	at weblogic.security.providers.saml.SAMLAssert.assertToken(SAMLAssert.java:135)	at weblogic.security.providers.saml.SAMLIdentityAsserterProviderImpl.assertIdentity(SAMLIdentityAsserterProviderImpl.java:270)	at sun.reflect.GeneratedMethodAccessor141.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at com.bea.common.security.internal.utils.Delegator$ProxyInvocationHandler.invoke(Delegator.java:61)	at undefined.$Proxy23.assertIdentity(Unknown Source)	at com.bea.common.security.internal.service.IdentityAssertionTokenServiceImpl.assertIdentity(IdentityAssertionTokenServiceImpl.java:90)	at sun.reflect.GeneratedMethodAccessor140.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at com.bea.common.security.internal.utils.Delegator$ProxyInvocationHandler.invoke(Delegator.java:61)	at undefined.$Proxy24.assertIdentity(Unknown Source)	at com.bea.common.security.internal.service.IdentityAssertionServiceImpl.assertIdentity(IdentityAssertionServiceImpl.java:81)	at sun.reflect.GeneratedMethodAccessor139.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at com.bea.common.security.internal.utils.Delegator$ProxyInvocationHandler.invoke(Delegator.java:61)	at undefined.$Proxy25.assertIdentity(Unknown Source)	at weblogic.security.service.PrincipalAuthenticator.assertIdentity(PrincipalAuthenticator.java:439)	at weblogic.wsee.security.saml.Utils.assertIdentity(Utils.java:243)	at weblogic.wsee.security.saml.SAMLTokenHandler.validateUnmarshalled(SAMLTokenHandler.java:231)	at weblogic.xml.crypto.wss.SecurityImpl.unmarshalAndProcessSecurityToken(SecurityImpl.java:463)	at weblogic.xml.crypto.wss.SecurityImpl.unmarshal(SecurityImpl.java:381)	at weblogic.xml.crypto.wss.SecurityImpl.unmarshal(SecurityImpl.java:327)	at weblogic.xml.crypto.wss.api.WSSecurityFactory.unmarshalAndProcessSecurity(WSSecurityFactory.java:65)	at weblogic.wsee.security.WssServerHandler.processRequest(WssServerHandler.java:35)	at weblogic.wsee.security.WssHandler.handleRequest(WssHandler.java:72)	at weblogic.wsee.handler.HandlerIterator.handleRequest(HandlerIterator.java:127)	at weblogic.wsee.ws.dispatch.server.ServerDispatcher.dispatch(ServerDispatcher.java:85)	at weblogic.wsee.ws.WsSkel.invoke(WsSkel.java:80)	at weblogic.wsee.server.servlet.SoapProcessor.handlePost(SoapProcessor.java:66)	at weblogic.wsee.server.servlet.SoapProcessor.process(SoapProcessor.java:44)	at weblogic.wsee.server.servlet.BaseWSServlet$AuthorizedInvoke.run(BaseWSServlet.java:165)	at weblogic.wsee.server.servlet.BaseWSServlet.service(BaseWSServlet.java:84)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)	at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:225)	at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:127)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)	at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3214)	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:1983)	at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1890)	at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1344)	at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)	at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)