我正在使用EclipseLink，并且我与orphanRemoval = true注释的一方有一对多的关系。当我将“many”列表（quoteItems）设置为null并尝试合并后跟对父项的刷新（Quote，“one”insteance）时，JPA会尝试更新子项，将外键设置为null而不是删除这些孩子。这是代码：
“一”类
public class Quote implements NamedBean, Serializable {
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// bi-directional many-to-one association to QuoteItem
@OneToMany(mappedBy = "quote", fetch = FetchType.EAGER, cascade = { CascadeType.MERGE, CascadeType.PERSIST }, orphanRemoval=true)
@XmlElement
public List<QuoteItem> getQuoteItems() {
if ((quoteItems == null || quoteItems.size() == 0) && (quoteAsXml != null && quoteAsXml.length() > 0)) {
// Reconstitute the quoteItems from the quoteAsXml
QuoteDAO.unpackQuoteItems(this);
}
return this.quoteItems;
}
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}
“很多”课程：
public class QuoteItem implements Serializable {
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//bi-directional many-to-one association to Quote
@ManyToOne
@XmlTransient
public Quote getQuote() {
return this.quote;
}
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}
截断的堆栈转储：
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Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'quote_id' cannot be null
Error Code: 1048
Call: UPDATE quote_item SET QUOTE_ID = ? WHERE (ID = ?)
bind => [null, 64]
Query: UpdateObjectQuery(com.millereads.model.quote.QuoteItem@11e6d13)
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:331)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:902)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeNoSelect(DatabaseAccessor.java:964)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:633)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:560)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:2055)
at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:306)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:242)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.updateObject(DatasourceCallQueryMechanism.java:797)
at org.eclipse.persistence.internal.queries.StatementQueryMechanism.updateObject(StatementQueryMechanism.java:435)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.updateObjectForWriteWithChangeSet(DatabaseQueryMechanism.java:1078)
at org.eclipse.persistence.queries.UpdateObjectQuery.executeCommitWithChangeSet(UpdateObjectQuery.java:84)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:301)
at org.eclipse.persistence.queries.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:58)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:904)
at org.eclipse.persistence.queries.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:803)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModifyQuery.java:108)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:85)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2896)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1857)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1839)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1790)
at org.eclipse.persistence.internal.sessions.CommitManager.commitChangedObjectsForClassWithChangeSet(CommitManager.java:273)
at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsForClassWithChangeSet(CommitManager.java:193)
at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:139)
at org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:4263)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1441)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithPreBuiltChangeSet(UnitOfWorkImpl.java:1587)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.writeChanges(RepeatableWriteUnitOfWork.java:455)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.flush(EntityManagerImpl.java:874)
... 95 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'quote_id' cannot be null
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1039)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2683)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2144)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2444)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2362)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2347)
at com.sun.gjc.spi.base.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:125)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:892)
... 124 more
持久性代码（目前情况相同，投诉相同）
public Quote update(Quote entity) {
if (entity.getState() == QuoteState.POIssued) {
String quoteAsXml = entity.getQuoteAsXml();
if (quoteAsXml == null || quoteAsXml.length() == 0) {
// Convert the Quote into XML
try {
JAXBContext contextObj;
contextObj = JAXBContext.newInstance(Quote.class);
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
Marshaller marshallerObj = contextObj.createMarshaller();
marshallerObj.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, false);
marshallerObj.marshal(entity, outStream);
entity.setQuoteAsXml(outStream.toString());
} catch (JAXBException e) {
throw new RuntimeException(e);
}
}
// Do not save the quoteItems!
entity.getQuoteItems().clear();
}
return super.update(entity);
}
祖先类'update（）：
@Override
public T update(T entity) {
T result = manager.merge(entity);
manager.flush();
return result;
}