JPA Weird Transaction error ... ?

Question

Hi All,
For this code i am getting a weird exception which follows the code block..
i have started a Transaction but still openjpa gives this exception
  public static void deletePort(String port){
       BcsPort bPort=em.find(BcsPort.class, port);
       try{
               EntityTransaction tx= em.getTransaction();
               tx.begin();
               System.out.println("Active:" +tx.isActive()); //*Prints True*
               em.remove(bPort);
               tx.commit();
       if(em.isOpen())
            em.flush();
       em.clear();
       }catch (Exception e) {
            e.printStackTrace();
Exception Stack Trace
ERROR:  Can only perform operation while a transaction is active.
<openjpa-1.0.0-r420667:568756 nonfatal user error> org.apache.openjpa.persistence.TransactionRequiredException: Can only perform operation while a transaction is active.
     at org.apache.openjpa.kernel.BrokerImpl.assertActiveTransaction(BrokerImpl.java:4301)
     at org.apache.openjpa.kernel.DelegatingBroker.assertActiveTransaction(DelegatingBroker.java:1314)
     at org.apache.openjpa.persistence.EntityManagerImpl.flush(EntityManagerImpl.java:487)
     at com.test.local.EntityManagerTester.deletePort(EntityManagerTester.java:180)
     at test.TestJPA.JPAInit(TestJPA.java:100)
     at test.TestJPA.testMutiple(TestJPA.java:152)
     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:597)
     at junit.framework.TestCase.runTest(TestCase.java:168)
     at junit.framework.TestCase.runBare(TestCase.java:134)Help on this please
Thanks..

Answer 1

>
          tx.commit();
     if(em.isOpen())
          em.flush();
     em.clear();
     }catch (Exception e) {
          e.printStackTrace();
sry my bad ... em.flush() is the culprit