内部异常：java.sql.SQLSyntaxErrorException：ORA-00972：标识符太长

Question

我开发具有摆动的应用

我HABE数据库与几个表;这些表与外键连接
当我尝试运行此应用程序时，出现错误;

Exception in thread "AWT-EventQueue-0" javax.ejb.EJBException: EJB Exception: ; nested exception is: 
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException 
Internal Exception: java.sql.SQLSyntaxErrorException: ORA-00972: Bezeichner ist zu lang 

Error Code: 972 
    at weblogic.ejb.container.internal.RemoteBusinessIntfProxy.unwrapRemoteException(RemoteBusinessIntfProxy.java:117) 
    at weblogic.ejb.container.internal.RemoteBusinessIntfProxy.invoke(RemoteBusinessIntfProxy.java:92) 
    at com.sun.proxy.$Proxy0.getKinokindergeldfallFindAll(Unknown Source) 
    at de.itech.kiwi.startseite.actionPerformed(startseite.java:242) 
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) 
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) 
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) 
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) 
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) 
    at java.awt.Component.processMouseEvent(Component.java:6505) 
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) 
    at java.awt.Component.processEvent(Component.java:6270) 
    at java.awt.Container.processEvent(Container.java:2229) 
    at java.awt.Component.dispatchEventImpl(Component.java:4861) 
    at java.awt.Container.dispatchEventImpl(Container.java:2287) 
    at java.awt.Component.dispatchEvent(Component.java:4687) 
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832) 
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492) 
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422) 
    at java.awt.Container.dispatchEventImpl(Container.java:2273) 
    at java.awt.Window.dispatchEventImpl(Window.java:2719) 
    at java.awt.Component.dispatchEvent(Component.java:4687) 
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729) 
    at java.awt.EventQueue.access$200(EventQueue.java:103) 
    at java.awt.EventQueue$3.run(EventQueue.java:688) 
    at java.awt.EventQueue$3.run(EventQueue.java:686) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87) 
    at java.awt.EventQueue$4.run(EventQueue.java:702) 
    at java.awt.EventQueue$4.run(EventQueue.java:700) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:699) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) 
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91) 
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.DatabaseException 
Internal Exception: java.sql.SQLSyntaxErrorException: ORA-00972: Bezeichner ist zu lang 

Error Code: 972 
    at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:333) 
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:646) 
    at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:537) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:1805) 
    at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:566) 
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:207) 
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:193) 
    at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectOneRow(DatasourceCallQueryMechanism.java:668) 
    at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectOneRowFromTable(ExpressionQueryMechanism.java:2769) 
    at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectOneRow(ExpressionQueryMechanism.java:2722) 
    at org.eclipse.persistence.queries.ReadObjectQuery.executeObjectLevelReadQuery(ReadObjectQuery.java:453) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1150) 
    at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:852) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1109) 
    at org.eclipse.persistence.queries.ReadObjectQuery.execute(ReadObjectQuery.java:421) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.internalExecuteQuery(AbstractSession.java:2977) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1607) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1589) 
    at org.eclipse.persistence.internal.indirection.NoIndirectionPolicy.valueFromQuery(NoIndirectionPolicy.java:326) 
    at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRowInternal(ForeignReferenceMapping.java:2162) 
    at org.eclipse.persistence.mappings.OneToOneMapping.valueFromRowInternal(OneToOneMapping.java:1717) 
    at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRow(ForeignReferenceMapping.java:2051) 
    at org.eclipse.persistence.mappings.ForeignReferenceMapping.readFromRowIntoObject(ForeignReferenceMapping.java:1386) 
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:448) 
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:814) 
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneNormally(ObjectBuilder.java:723) 
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:676) 
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:609) 
    at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:564) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:777) 
    at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:797) 
    at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:434) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1150) 
    at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:852) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1109) 
    at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:393) 
    at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1197) 
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2879) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1607) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1589) 
    at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1554) 
    at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:231) 
    at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:411) 
    at weblogic.persistence.QueryProxyImpl.getResultList(QueryProxyImpl.java:145) 
    at de.itech.kino.model.ItechSessionEJBBean.getKinokindergeldfallFindAll(ItechSessionEJBBean.java:167) 
    at de.itech.kino.model.ItechSessionEJB_ohevbk_ItechSessionEJBImpl.__WL_invoke(Unknown Source) 
    at weblogic.ejb.container.internal.SessionRemoteMethodInvoker.invoke(SessionRemoteMethodInvoker.java:34) 
    at de.itech.kino.model.ItechSessionEJB_ohevbk_ItechSessionEJBImpl.getKinokindergeldfallFindAll(Unknown Source) 
    at de.itech.kino.model.ItechSessionEJB_ohevbk_ItechSessionEJBImpl_WLSkel.invoke(Unknown Source) 
    at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:693) 
    at weblogic.rmi.cluster.ClusterableServerRef.invoke(ClusterableServerRef.java:230) 
    at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:519) 
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:363) 
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:146) 
    at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:515) 
    at weblogic.rmi.internal.wls.WLSExecuteRequest.run(WLSExecuteRequest.java:118) 
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:295) 
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:254) 

此表Kinokindergeldfall帽子表kinoantragsteller

@OneToOne (cascade = CascadeType.ALL , fetch= FetchType.EAGER) 

private Kinokindergeldfall kinokindergeldfall; 

等类kinokindergeldfall外键：

@Column(nullable= false) 
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "Kinokindergeldfall_Id_Seq_Gen") 
private BigDecimal kindergeldfallid; 
@Column(nullable = false) 
private String kindergeldnummer; 
@OneToOne(mappedBy = "kinokindergeldfall", cascade = CascadeType.ALL) 
private Kinoantragsteller kinoantragstellerList; 

Answer 1

如果不与一些列名供应@JoinColumn关系，JPA将采用默认的。默认的结构像<source_class_field_name>_<target_class_id_field_name>，在你的情况下，它解析为kinokindergeldfall_kindergeldfallid，它的长度超过30个字符。这是导致异常的原因。

由于您无法首先创建具有此名称的列，因此只需将@JoinColumn(name = "<column name>")与用作外键的列的实际名称添加到另一个表（短于30个字符）即可。

@OneToOne (cascade = CascadeType.ALL , fetch= FetchType.EAGER) 
@JoinColumn(name = "<column name>") 
private Kinokindergeldfall kinokindergeldfall;