problems with UserTransactionFactory.userTransaction();
b_ Jan 2, 2008 7:31 AMHi all,
I am trying to implement my own code similar to the xts-demo. When i try to obtain a new transaction:
UserTransaction ut = UserTransactionFactory.userTransaction();
the UserTransaction returned is null and consequently when this line of code is executed:
ut.begin();
i get a null pointer exception:
13:26:30,171 INFO [STDOUT] CLIENT: starting the transaction... 13:26:30,171 ERROR [STDERR] java.lang.NullPointerException 13:26:30,171 ERROR [STDERR] at com.thesis.wscoordination.servlets.BasicClient.testAtomicTransaction(Unknown Source) 13:26:30,171 ERROR [STDERR] at com.thesis.wscoordination.servlets.BasicClient.test(Unknown Source) 13:26:30,171 ERROR [STDERR] at com.thesis.wscoordination.servlets.BasicClient.doGet(Unknown Source) 13:26:30,171 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:697) 13:26:30,171 ERROR [STDERR] at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) 13:26:30,171 ERROR [STDERR] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) 13:26:30,171 ERROR [STDERR] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) 13:26:30,171 ERROR [STDERR] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) 13:26:30,171 ERROR [STDERR] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) 13:26:30,171 ERROR [STDERR] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) 13:26:30,171 ERROR [STDERR] at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) 13:26:30,171 ERROR [STDERR] at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) 13:26:30,171 ERROR [STDERR] at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) 13:26:30,171 ERROR [STDERR] at java.lang.Thread.run(Thread.java:595)
Any ideas please?