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當我嘗試更新託管實體EJB時,我收到OptimisticLockException
。JBossAS-7中的OptimisticLockException
的EJB經取:
port = entityManager.find(PortEntity.class, portID);
然後EJB和EntityManager的已被傳遞到SAX ContentHandler
使得在endDocuent()
方法可以更新。 ContentHandler
已從Google的Time Zone API server(s)返回的數據中提取時區信息。
的代碼片段是:
entityManager.refresh(port);
if (entityManager.contains(port))
log.info("Contained: " + port);
else
log.info("NOT Contained: " + port);
port.setTimezone(toTimezone);
entityManager.flush(); // <-- Line 70
和日誌文件顯示:
13:48:05,568 INFO [GeotimezoneHandler] Status: OK
13:48:05,569 INFO [GeotimezoneHandler] Raw offset: 3600.0000000
13:48:05,570 INFO [GeotimezoneHandler] DST offset: 0.0000000
13:48:05,570 INFO [GeotimezoneHandler] Timezone ID: Europe/Madrid
13:48:05,571 INFO [GeotimezoneHandler] Timezone Name: Central European Standard Time
13:48:05,577 INFO [GeotimezoneHandler] Contained: SeaPort[id=ESBCN, name=Barcelona]
13:48:05,591 ERROR [GeotimezoneHandler] Updating curise: javax.persistence.OptimisticLockException: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.nutrastat.voyager.entity.PortEntity$Sea#ESBCN]
at org.hibernate.ejb.AbstractEntityManagerImpl.wrapStaleStateException(AbstractEntityManagerImpl.java:1390) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1308) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1289) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1295) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]
at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:976) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]
at org.jboss.as.jpa.container.AbstractEntityManager.flush(AbstractEntityManager.java:439) [jboss-as-jpa-7.1.1.Final.jar:7.1.1.Final]
at com.nutrastat.voyager.util.GeotimezoneHandler.endDocument(GeotimezoneHandler.java:70) [voyager-lib.jar:]
因此,如果entityManager
包含EJB爲什麼對矯正它做後,我得到的異常?
一如往常許多感謝您的幫助
史蒂夫
附:
我已經看過this thread和MySQL數據庫使用的是InnoDB,但我不知道如何從我的代碼中執行SELECT @@tx_isolation;
命令。