Question

我在MS Sql Server上使用Hibernate 3.3的Tomcat服务器。当使用Hibernate的默认连接池时，我收到了与无效状态的连接相关的几个错误，因此我们决定切换到C3P0并使用testConnectionOnCheckout设置。

问题是现在我们遇到了这些错误：

2011-10-21 15:30:39,125 ERROR [http-8080-8] 
(org.slf4j.impl.JCLLoggerAdapter.error(JCLLoggerAdapter.java:532)) - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)
 org.hibernate.AssertionFailure: null id in X entry (don't flush the Session after an exception occurs)
    at org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:78)
    at org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:187)
    at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:143)
    at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
    at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
    at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:58)
    at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:997)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1590)
    at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306)
    ...

hibernate.cfg.xml的内容是：

<property name="hibernate.connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
<property name="hibernate.connection.url">jdbc:sqlserver://...</property>
<property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>

<property name="hibernate.current_session_context_class">thread</property>

<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.min_size">3</property>
<property name="hibernate.c3p0.max_size">5</property>
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.idle_test_period">100</property>
<property name="hibernate.c3p0.preferredTestQuery">SELECT 1</property>
<property name="hibernate.c3p0.testConnectionOnCheckout">true</property>

C3P0确实正在启动，我们可以在日志中看到它。但我们不知道导致断言失败的原因。在SO中检查其他问题并没有提出任何有用的见解。有什么想法吗？

使用C3P0时，Hibernate断言失败

0 个答案: