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POEclipse link jpa problem
 

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    <p>With two users simultaneously using my simple app, I'm getting exception:</p> <pre><code>Error Code: 0 Call: SELECT ID, NAME, IMAGE FROM GameObjectTable ORDER BY ID ASC Query: ReadAllQuery(referenceClass=GameObject sql="SELECT ID, NAME, IMAGE FROM GameObjectTable ORDER BY ID ASC") Caused by: org.postgresql.util.PSQLException: There was In/Out error while sending to server at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:283) at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:479) at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:367) at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:271) at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeSelect(DatabaseAccessor.java:891) at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:601) ... 116 more Caused by: java.io.IOException: Stream closed at sun.nio.cs.StreamEncoder.ensureOpen(StreamEncoder.java:26) at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:121) at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:212) at org.postgresql.core.PGStream.flush(PGStream.java:507) at org.postgresql.core.v3.QueryExecutorImpl.sendSync(QueryExecutorImpl.java:1107) at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:256) ... 121 more </code></pre> <p>Method cousing error is:</p> <pre><code>@Repository public class GameObjectDao{ @PersistenceContext(type = PersistenceContextType.EXTENDED) protected EntityManager entityManager; @Transactional public List&lt;String&gt; getGameObjectNames() { return getEntityManager().createQuery("select g.name from GameObject as g").getResultList(); ... } </code></pre> <p>}</p> <p>Spring transaction manager:</p> <pre><code>&lt;bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"&gt; &lt;property name="entityManagerFactory" ref="entityManagerFactory"/&gt; &lt;property name="dataSource" ref="dataSource"/&gt; &lt;/bean&gt; &lt;tx:annotation-driven /&gt; </code></pre> <p>What is wrong?</p> <p>//EDIT</p> <pre><code>&lt;bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"&gt; &lt;property name="dataSource" ref="dataSource"/&gt; &lt;property name="jpaVendorAdapter"&gt; &lt;bean class="org.springframework.orm.jpa.vendor.EclipseLinkJpaVendorAdapter"&gt; &lt;property name="showSql" value="false"/&gt; &lt;/bean&gt; &lt;/property&gt; &lt;property name="loadTimeWeaver"&gt; &lt;bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/&gt; &lt;/property&gt; &lt;property name="jpaDialect"&gt; &lt;bean class="org.springframework.orm.jpa.vendor.EclipseLinkJpaDialect "/&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"&gt; &lt;property name="driverClassName" value="org.postgresql.Driver"/&gt; &lt;property name="url" value="${db.url}"/&gt; &lt;property name="username" value="${db.username}"/&gt; &lt;property name="password" value="${db.password}"/&gt; &lt;/bean&gt; </code></pre> <p>In mysql error is different:</p> <pre><code> Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.apache.wicket.session.DefaultPageFactory.createPage(DefaultPageFactory.java:192) ... 69 more Caused by: java.lang.NullPointerException at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:1646) at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:1622) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1332) at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeSelect(DatabaseAccessor.java:891) at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:601) at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:529) at org.eclipse.persistence.internal.sessions.AbstractSession.executeCall(AbstractSession.java:914) at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:205) at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:191) at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:262) at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:618) at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2537) at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2496) at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:455) at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:997) at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:675) at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:958) at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:432) at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1021) at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2863) at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1225) at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1207) at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1181) at org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:453) at org.eclipse.persistence.internal.jpa.EJBQueryImpl.getResultList(EJBQueryImpl.java:669) </code></pre>
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