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java.lang.reflect.InvocationTargetException: 	at sun.reflect.GeneratedMethodAccessor30.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at org.postgresql.jdbc2.optional.PooledConnectionImpl$ConnectionHandler.invoke(PooledConnectionImpl.java:242)	at $Proxy0.rollback(Unknown Source)	at com.sun.enterprise.resource.JdbcXAConnection$JdbcConnection.close(JdbcXAConnection.java:461)	at Authenticate.getUser(Authenticate.java:188)	at Authenticate.doPost(Authenticate.java:68)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)	at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)	at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)	at java.security.AccessController.doPrivileged(Native Method)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)	at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)	at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)