Question

我有两个实体经理（这必须保持不变）。我正在使用内存数据库进行单元测试。当我运行测试时，我发现了以下问题。

在这个简单的案例中：

  emFirst.createNativeQuery("select * from schema1.table").getResultList();

  emSecond.createNativeQuery("create table schema2.table (id int)").executeUpdate();

将HSQL从2.3.2升级到2.3.4后陷入僵局。

为了让它再次起作用，我必须在事务中包装每个语句。

你知道如何在不使用下方的情况下使其工作吗？

    getTransaction().begin();
    emFirst.createNativeQuery("select * from schema1.table").getResultList();
    getTransaction().commit();

    getTransaction().begin();         
    emSecond.createNativeQuery("create table schema2.table (id int)").executeUpdate();
    getTransaction().commit();

我正在使用Hibernate 4.3.6

这是来自死锁的堆转储：

> "main" #1 prio=5 os_prio=0 tid=0x00007f7be0015000 nid=0x3b29 waiting
> on condition [0x00007f7be8584000]    java.lang.Thread.State: WAITING
> (parking)     at sun.misc.Unsafe.park(Native Method)
>   - parking to wait for  <0x000000073635b3d0> (a org.hsqldb.lib.CountUpDownLatch$Sync)    at
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)     at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>   at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>   at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>   at org.hsqldb.lib.CountUpDownLatch.await(Unknown Source)    at
> org.hsqldb.Session.executeCompiledStatement(Unknown Source)   at
> org.hsqldb.Session.execute(Unknown Source)
>   - locked <0x000000073635b298> (a org.hsqldb.Session)    at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(Unknown Source)    at
> org.hsqldb.jdbc.JDBCPreparedStatement.executeUpdate(Unknown Source)
>   - locked <0x00000007363a92f8> (a org.hsqldb.jdbc.JDBCPreparedStatement)     at
> com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:147)
>   at
> org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208)
>   at
> org.hibernate.engine.query.spi.NativeSQLQueryPlan.performExecuteUpdate(NativeSQLQueryPlan.java:211)
>   at
> org.hibernate.internal.SessionImpl.executeNativeUpdate(SessionImpl.java:1310)
>   at
> org.hibernate.internal.SQLQueryImpl.executeUpdate(SQLQueryImpl.java:389)

Answer 1

使用HSQLDB服务器而不是进程内数据库。

HSQL与两个实体经理的死锁

1 个答案: