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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-9420" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-bug-b786899d-b2c6-489a-9632-3fde26bcfda2" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-9420" style="color: #3b73af; text-decoration: none">HHH-9420</a>
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Issue Type:
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-bug-b786899d-b2c6-489a-9632-3fde26bcfda2" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /> Bug
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Affects Versions:
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4.2.15
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Assignee:
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Unassigned
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Components:
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core
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Created:
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26/Sep/2014 00:49 AM
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Environment:
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J2SE 7 <br /> JPA 2.0 <br /> C3P0 0.9.2.1
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Priority:
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-minor-1e93afdc-a9a3-49e2-891d-2a56e72bf240" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom" /> Minor
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Reporter:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="cchene" id="email_cchene" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=cchene" style="color:#6c797f;; color: #3b73af; text-decoration: none">Cyril Chéné</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">When committing a transaction, exceptions are logged at DEBUG level :</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
09:33:02,118 DEBUG SqlExceptionHelper:294 - could not log warnings
java.sql.SQLException: You can't operate on a closed Statement!!!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118)
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:77)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.getWarnings(NewProxyPreparedStatement.java:1037)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.handleAndClearWarnings(SqlExceptionHelper.java:291)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.logAndClearWarnings(SqlExceptionHelper.java:250)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.close(JdbcCoordinatorImpl.java:489)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.release(JdbcCoordinatorImpl.java:381)
at org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl.releaseStatements(AbstractBatchImpl.java:171)
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:73)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3079)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3521)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:88)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:395)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:387)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:303)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:349)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1159)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:404)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:75)
at App.main(App.java:26)
Caused by: java.lang.NullPointerException
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.maybeDirtyTransaction(NewProxyPreparedStatement.java:2520)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.getWarnings(NewProxyPreparedStatement.java:1029)
... 20 more
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I know this exception is triggered by C3P0 code, but I think the problem is the misuse of SQL Statements by Hibernate 4.2.15. Here is my analysis...</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">The method <tt>org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch()</tt> calls <tt>jdbcCoordinator.release(statement)</tt> twice for each <tt>javax.sql.Statement</tt> : one in a loop for each statement, another when calling the <tt>releaseStatements()</tt> method.<br /> But the <tt>jdbcCoordinator.release(statement)</tt> method does two things :</p>
<ol>
<li>
log the statement warnings
</li>
<li>
close the statement
</li>
</ol>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Therefore, each statement will be subject to the following method calls :</p>
<ol>
<li>
<tt>getWarnings</tt>
</li>
<li>
<tt>close</tt>
</li>
<li>
<tt>getWarnings</tt>
</li>
<li>
<tt>close</tt>
</li>
</ol>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">On the second call to <tt>getWarnings</tt>, <tt>java.sql.SQLException</tt> is thrown as the statement has been closed before. This is the behaviour of C3P0 statement implementation, and is consistent with the <tt>java.sql.Statement</tt> <a href="http://docs.oracle.com/javase/7/docs/api/java/sql/Statement.html#getWarnings%28%29" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">specification</a> that says : <em>Throws SQLException - if (...) this method is called on a closed Statement</em></p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Priority is set to minor as this does not seem the disturb the application behaviour, but only</p>
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