Prepared statement methods addBatch() and clearBatch() can cause NullPointerException ------------------------------------------------------------------------------------- Key: TEIID-521 URL: https://jira.jboss.org/jira/browse/TEIID-521 Project: Teiid Issue Type: Bug Components: JDBC Connector Affects Versions: 6.0.0 Reporter: Larry O'Leary Assignee: Larry O'Leary Fix For: 6.1.0 Attachments: TestMMPreparedStatement.java When attempting to debug an unrelated issue I discovered that the batch processing methods on a prepared statement can result in a NullPointerException depending on when the methods are called. For example: java.lang.NullPointerException at com.metamatrix.jdbc.MMStatement.clearBatch(MMStatement.java:274) at com.metamatrix.jdbc.TestPreparedStatementBatchedUpdate.testInserts(TestPreparedStatementBatchedUpdate.java:102) 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:585) at junit.framework.TestCase.runTest(TestCase.java:154) at junit.framework.TestCase.runBare(TestCase.java:127) at junit.framework.TestResult$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:118) at junit.framework.TestSuite.runTest(TestSuite.java:208) at junit.framework.TestSuite.run(TestSuite.java:203) at junit.framework.TestSuite.runTest(TestSuite.java:208) at junit.framework.TestSuite.run(TestSuite.java:203) at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) Is a result of calling clearBatch() on a statement after it was done executing a batched update. It appears this is simply a need of NOT calling clearBatch() at the wrong time but I feel that we should gracefully handle this situation as a clearBatch() call may appear in a try/catch/finally block. The same goes for addBatch() if no parameters have been set. Not sure if we should actually throw an exception in such a case or not as it makes no sense to call addBatch() with no parameters defined but it would also make sense that we would not throw a nasty NPE in such a case. I have only seen this on R050502 and R050503 and have not looked at R050504c or Teiid.