Hibernate：org.hibernate.AssertionFailure：com.xxx.Bean條目中的null id

Question

我遇到了以下錯誤：

com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract void com.xxx.Service.save(com.xxx.Bean)' threw an unexpected exception: org.hibernate.AssertionFailure: null id in com.xxx.Bean entry (don't flush the Session after an exception occurs)
    at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:385)
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:588)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:541)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:383)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:680)
Caused by: org.hibernate.AssertionFailure: null id in com.xxx.Bean entry (don't flush the Session after an exception occurs)
    at org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:82)
    at org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:190)
    at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:147)
    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.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
    at com.xxx.ServiceImpl.save(ServiceImpl.java:32)
    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:597)
    ... 23 more

這是MySQL表定義：

CREATE TABLE `tblARF` (
  `ARF_ID` bigint(19) NOT NULL AUTO_INCREMENT,
  `ARF_MANUFACTURER_MNF_ID` bigint(19) NOT NULL,
  ...
  PRIMARY KEY (`ARF_ID`),
  KEY `ARF_MANUFACTURER_MNF_ID` (`ARF_MANUFACTURER_MNF_ID`)
)

這是Hibernate映射：

<class name="Bean" table="tblARF">
  <id name="key" type="long" unsaved-value="null">
    <column name="ARF_ID" not-null="true"/>
    <generator class="identity" />
  </id>
<many-to-one column="ARF_MANUFACTURER_MNF_ID" name="manufacturer"
    class="ManufacturerBean" not-null="true" lazy="false"/>
...
</class>

Java代碼：

Session s = hibernate.getCurrentSession();
Transaction t = s.beginTransaction();
s.merge(bean.getManufacturer());
s.save(bean);
t.commit();

我注意到如果我刪除了KEY ARF_MANUFACTURER_MNF_ID (ARF_MANUFACTURER_MNF_ID) ，那么AssertionFailure就不會發生。 有沒有辦法避免這個錯誤而不刪除KEY？

不幸的是， 這個解決方案對我不起作用。

Answer 1

答案在這里找到： https ： //forum.hibernate.org/viewtopic.php？f = 1＆t = 1009141

'order'是SQL中的保留關鍵字，因此如果要將if用作列名，則需要引用它。 有關如何啟用此功能的說明，請參閱http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/mapping.html#mapping-quotedidentifiers 。

Answer 2

您發布的例外情況說明了問題所在：

Caused by: org.hibernate.AssertionFailure: null id in com.xxx.Bean entry (don't flush the Session after an exception occurs)

在Hibernate中，您必須在發生與會話相關的異常后丟棄Hibernate會話。

但我想這不是你的問題。

您需要設置Bean的ID或使用<generator class="native" /> （@ @GeneratedValue(strategy=GenerationType.AUTO) ）。

添加嘗試替換：通過save merge

Answer 3

有時真正的錯誤在於其他地方。 要檢查確切的錯誤，請使用Debug模式並使用printstacktrace（）方法進行異常。 它為您提供了更詳細的原因。 在我的情況下，我使用了String，其中列的類型為int。

Answer 4

我不確定它是否與您的問題有關，但請注意merge()的錯誤用法。

merge()不會使傳遞給它的對象持久化，而是返回另一個具有相同狀態的實例，所以你應該寫

bean.setManufacturer(s.merge(bean.getManufacturer()));