我真的很难理解为什么会出现这个错误。我得到它指的是我的艺术家实体中的 GLOBAL_ID 字段。我想我一定错过了有关 JPA 内部运作方式的一些信息。让我们考虑这两个实体。
@Entity
public class Music {
@Id
private String MYID;
@Column(unique=true)
private String GLOBAL_ID;
@ManyToOne(cascade=CascadeType.ALL) @JoinColumn(name="ARTIST_ID")
private Artist artist;
}
@Entity
public class Artist {
@Id
private String MYID;
@Column(unique=true)
private String GLOBAL_ID;
}
在我尝试坚持音乐之前。我通过艺术家 GLOBAL_ID 查找数据库(如果已经存在)。如果存在，我会获取从数据库获得的实例，并将艺术家设置为音乐。之后，我执行 EntityManager.merge(Music)。因此，我认为即使我从 DB 获得了这位艺术家并将新加入的艺术家与现有艺术家交换，由于音乐是新的，实体管理器也会尝试再次保留它。所以，我做了不同的事情...... 我进行了艺术家查找，当数据库中存在具有相同 GLOBAL_ID 的艺术家时，我将音乐中的艺术家字段设置为空并合并音乐。之后，我获得了托管音乐实体并设置了我之前查找过的现有艺术家。没有成功... 我像这样合并...... Music = EntityManager.merge(Music)
我一整天都在浏览这段代码，但找不到我做错了什么。 JPA 不应该尝试持久化并且实体已经被管理吗？我不知道。如果有人能帮助我解决这个问题，我将不胜感激。
除了我已经尝试过的一万亿种不同的东西之外，我还尝试将找到的艺术家从数据库中分离出来，但后来我无法重新合并它。
预先感谢您的帮助，
问候，
下面是处理持久性和堆栈跟踪的代码。
好的，我会尝试发帖并解释... 这是一个导入 bean，它循环从目录中读取 mp3 文件，从中获取 ID3 标签并从中构造 Music 类。
这是处理 JPA 的代码。我已经修改了几次以消除该错误。现在，当现有艺术家的音乐是新的时，我从音乐中删除艺术家引用，并在音乐合并后将其链接到现有艺术家。之前，我只是将艺术家与现有的艺术家交换并完全坚持下去。 我可以看到所有带有令人满意的 ID 的日志消息等等。我的意思是我可以注意到艺术家查询找到了一位现有的艺术家。下面是堆栈跟踪。再次感谢您的浏览...
if (mediaMusic.getMYID() == null || mediaMusic.getMYID().equals("")) {
Music oldMusic = null;
Query mq = null;
if (mediaMusic.getGLOBAL_ID() != null && !mediaMusic.getGLOBAL_ID().equals("")) {
mq = em.createNamedQuery(Music.QUERY_FIND_BY_GLOBAL_ID);
mq.setParameter(Music.QUERY_PARAMETER_GLOBAL_ID, mediaMusic.getGLOBAL_ID());
Iterator musicsSameGLID = mq.getResultList().iterator();
if (musicsSameGLID.hasNext()) {
oldMusic = (Music) musicsSameGLID.next();
}
} else if (mediaMusic.getTitle() != null && !mediaMusic.getTitle().equals("")) {
mq = em.createNamedQuery(Music.QUERY_FIND_BY_TITLE);
mq.setParameter(Music.QUERY_PARAMETER_TITLE, mediaMusic.getTitle().toUpperCase());
Iterator existingMusics = mq.getResultList().iterator();
Music existingMusic = null;
while (existingMusics.hasNext()) {
existingMusic = (Music) existingMusics.next();
if (mediaMusic.getArtist() != null && existingMusic.getArtist() != null
&& mediaMusic.getArtist().getGLOBAL_ID() != null
&& mediaMusic.getArtist().getGLOBAL_ID().equals(existingMusic.getArtist().getGLOBAL_ID())) {
oldMusic = existingMusic;
break;
} else if (existingMusic.getArtist() != null && mediaMusic.getArtist() != null
&& existingMusic.getArtist().getName().equals(mediaMusic.getArtist().getName())) {
oldMusic = existingMusic;
break;
}
}
}
if (oldMusic != null) {
mediaMusic = oldMusic;
}
}
// IF IT IS A NEW ARTIST, CHECKING FOR EXISTING ONE
if (mediaMusic.getArtist() != null
&& (mediaMusic.getArtist().getMYID() == null || mediaMusic.getArtist().getMYID().equals(""))) {
if (mediaMusic.getArtist().getGLOBAL_ID() != null
&& !mediaMusic.getArtist().getGLOBAL_ID().equals("")) {
Query aq = em.createNamedQuery(Artist.QUERY_FIND_BY_GLOBAL_ID);
aq.setParameter(Artist.GLOBAL_ID_QUERY_PARAMETER, mediaMusic.getArtist().getGLOBAL_ID());
Iterator existingArtists = aq.getResultList().iterator();
if (existingArtists.hasNext()) {
// Persiste primeiro sem artista
logger.log(Level.INFO, "Artista {0}, ArtistaGLID: {1} para a musica MYID: {2} Titulo: {3} found in DB", new Object[]{mediaMusic.getArtist().getName(), mediaMusic.getArtist().getGLOBAL_ID(), mediaMusic.getMYID(), mediaMusic.getTitle()});
if (mediaMusic.getMYID() == null || mediaMusic.getMYID().equals("")) {
artistaExistente = (Artist) existingArtists.next();
mediaMusic.setArtist(null);
logger.log(Level.INFO, "Inserting and removing Artist: New artist is {0}", mediaMusic.getArtist());
} else {
mediaMusic.setArtist((Artist)existingArtists.next());
}
}
}
}
mediaMusic = em.merge(mediaMusic);
// 20110424 TRYING TO LINK EXISTING ARTIST AFTER MUSIC IN DB
if (artistaExistente != null)) {
logger.log(Level.INFO, "Music already in BD with o MYID: {0}", mediaMusic.getMYID());
logger.log(Level.INFO, "Adding artist {0} MYID: {1}", new Object[]{artistaExistente.getName(), artistaExistente.getMYID()});
mediaMusic.setArtist(artistaExistente);
logger.info("After artist had been added to Music");
}
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '01809552-4f87-45b0-a45b0-afff-2c6f0730a3be' for key 'GLOBAL_ID'
at sun.reflect.GeneratedConstructorAccessor178.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:407)
at com.mysql.jdbc.Util.getInstance(Util.java:382)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3603)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3535)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1989)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2150)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2626)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2415)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2333)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2318)
at com.sun.gjc.spi.base.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:120)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:789)
... 74 more
|#]
[#|2011-04-25T10:32:01.004-0300|SEVERE|oracle-glassfish3.1|co.bmq.media.beans.MediaMaintenanceBean|_ThreadID=53;_Thr$
javax.ejb.EJBException: Transaction aborted
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5121)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4894)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2039)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1990)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.jav$
at $Proxy201.updateMedia(Unknown Source)
at co.bmq.media.beans.__EJB31_Generated__MediaStorageServiceBean__Intf____Bean__.updateMedia(Unknown Source)
at co.bmq.media.beans.MediaMaintenanceBean.checkImportDir(MediaMaintenanceBean.java:98)
at sun.reflect.GeneratedMethodAccessor374.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManag
er.java:1124)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5367)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:801)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundTimeout(SystemInterceptorProxy.java:149)
at sun.reflect.GeneratedMethodAccessor373.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:862)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:801)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:371)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5339)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5327)
at com.sun.ejb.containers.BaseContainer.callEJBTimeout(BaseContainer.java:4033)
at com.sun.ejb.containers.EJBTimerService.deliverTimeout(EJBTimerService.java:1835)
at com.sun.ejb.containers.EJBTimerService.access$100(EJBTimerService.java:108)
at com.sun.ejb.containers.EJBTimerService$TaskExpiredWork.run(EJBTimerService.java:2708)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
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:662)
Caused by: javax.transaction.RollbackException: Transaction marked for rollback.
at com.sun.enterprise.transaction.JavaEETransactionImpl.commit(JavaEETransactionImpl.java:475)
at com.sun.enterprise.transaction.JavaEETransactionManagerSimplified.commit(JavaEETransactionManagerSimplified.java:$
at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5115)
... 37 more
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exce$
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '01809552-4f552-4f87-45b0-afff-2c6f0730a3be' for key 'GLOBAL_ID'
Error Code: 1062
Call: INSERT INTO ARTIST (MYID, ANNOTATION, COMMENT, COUNTRY, GENDER, LASTDATANORMALIZATIONDATE, LASTUPDATEDON, LIKES, GLOBAL_ID, NAME, SINCEDATE, TAGS, TODATE, TYPE, ENTITY_UID, VERSION) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
bind => [14 parameters bound]
Query: InsertObjectQuery(co.bmq.media.entity.Artist@3741c26)
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:324)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:798)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeNoSelect(DatabaseAccessor.java:864)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:583)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:526)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:1729)
at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:234)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.ja$
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.ja$
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.insertObject(DatasourceCallQueryMechanism.j$
at org.eclipse.persistence.internal.queries.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:162)
at org.eclipse.persistence.internal.queries.StatementQueryMechanism.insertObject(StatementQueryMechanism.java:177)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.insertObjectForWrite(DatabaseQueryMechanism.java:$
at org.eclipse.persistence.queries.InsertObjectQuery.executeCommit(InsertObjectQuery.java:80)
at org.eclipse.persistence.queries.InsertObjectQuery.executeCommitWithChangeSet(InsertObjectQuery.java:90)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.$
at org.eclipse.persistence.queries.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:58)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:808)
at org.eclipse.persistence.queries.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:711)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModif$
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:85)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2842)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1521)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1503)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1463)
at org.eclipse.persistence.internal.sessions.CommitManager.commitNewObjectsForClassWithChangeSet(CommitManager.java:$
at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsForClassWithChangeSet(CommitManager.java:$
at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:136)
at org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:3766)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1404)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitToDatabase(RepeatableWriteUnitOfWork.ja$
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1511)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.issueSQLbeforeCompletion(UnitOfWorkImpl.java:3115)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.issueSQLbeforeCompletion(RepeatableWriteUnitO$
at org.eclipse.persistence.transaction.AbstractSynchronizationListener.beforeCompletion(AbstractSynchronizationListe$
at org.eclipse.persistence.transaction.JTASynchronizationListener.beforeCompletion(JTASynchronizationListener.java:6$
at com.sun.enterprise.transaction.JavaEETransactionImpl.commit(JavaEETransactionImpl.java:437)
... 39 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '01809552-4f87-45b0-a$
at sun.reflect.GeneratedConstructorAccessor178.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:407)
at com.mysql.jdbc.Util.getInstance(Util.java:382)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3603)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3535)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1989)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2150)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2626)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2119)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2415)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2333)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2318)
at com.sun.gjc.spi.base.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:120)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:789)
... 74 more
最佳答案
我认为这可能是新音乐对象的合并在解决现有艺术家时变得困惑的问题。如果音乐是新的，请尝试调用 persist()，而不是 merge()。
关于java - JPA 内部运作。 MySQLIntegrityConstraintViolationException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5784546/