java - 具有涉及自定义比较器的 xml 反向引用的编码实体

Question

我正在尝试利用 MOxy 的 @XmlInverseReference 注释来编码 3 个实体的排列。我的场景非常类似于此处提供的示例 provided here

实体 A 持有实体 B 的集合，而实体 B 又持有实体 C 的集合。不同之处在于，实体 B 中的 C 集合是使用自定义比较器进行排序的。当我尝试编码(marshal)树时，出现 ClassCastException，其中检查实体 B 中的集合以查看是否包含实体 A，从而导致自定义比较器中出现异常，该比较器仅接受实体 C

这里是 A 中 B 集合的声明

@XmlElement
private Set<AssignmentPeriod> periods = new LinkedHashSet<AssignmentPeriod>();

这是 B 中 C 的集合，使用自定义比较器进行排序

@XmlElement
@XmlInverseReference(mappedBy="assignmentPeriod")

@Sort(type = SortType.COMPARATOR,comparator=AssignmentPeriodRateComparator.class)
    private Set<AssignmentPeriodRate> rates = new LinkedHashSet<AssignmentPeriodRate>();'

最后是 C 中对实体 B 的反向引用

@XmlElement
@XmlInverseReference(mappedBy="rates")
private AssignmentPeriod assignmentPeriod;

当我删除对比较器的任何引用时，它编码得非常好，当我重新添加比较器注释时，我得到一个类转换异常，其中检查AssignmentPeriodRate列表以查看是否包含CandidateAssignment类型的对象

堆栈跟踪如下。如有任何指点，我们将不胜感激!

Caused by: java.lang.ClassCastException: uk.co.rullion.mypayroll.entities.assignment.CandidateAssignment cannot be cast to uk.co.rullion.mypayroll.entities.assignment.AssignmentPeriodRate
at uk.co.rullion.mypayroll.entities.assignment.AssignmentPeriodRateComparator.compare(AssignmentPeriodRateComparator.java:1) [myPayrollEntities-0.0.1-SNAPSHOT.jar:]
at java.util.TreeMap.getEntryUsingComparator(Unknown Source) [rt.jar:1.7.0_17]
at java.util.TreeMap.getEntry(Unknown Source) [rt.jar:1.7.0_17]
at java.util.TreeMap.containsKey(Unknown Source) [rt.jar:1.7.0_17]
at java.util.TreeSet.contains(Unknown Source) [rt.jar:1.7.0_17]
at org.hibernate.collection.internal.PersistentSet.contains(PersistentSet.java:171) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
at org.eclipse.persistence.internal.queries.CollectionContainerPolicy.contains(CollectionContainerPolicy.java:113) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.queries.ContainerPolicy.contains(ContainerPolicy.java:701) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.queries.ContainerPolicy.contains(ContainerPolicy.java:1) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XMLCompositeCollectionMappingNodeValue.marshal(XMLCompositeCollectionMappingNodeValue.java:97) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.NodeValue.marshal(NodeValue.java:149) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.NodeValue.marshal(NodeValue.java:102) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.record.ObjectMarshalContext.marshal(ObjectMarshalContext.java:59) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XPathNode.marshal(XPathNode.java:401) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XPathObjectBuilder.buildRow(XPathObjectBuilder.java:240) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.buildRow(TreeObjectBuilder.java:118) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.buildRow(TreeObjectBuilder.java:1) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XMLCompositeCollectionMappingNodeValue.marshalSingleValue(XMLCompositeCollectionMappingNodeValue.java:324) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XMLCompositeCollectionMappingNodeValue.marshal(XMLCompositeCollectionMappingNodeValue.java:104) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.NodeValue.marshal(NodeValue.java:149) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.NodeValue.marshal(NodeValue.java:102) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.record.ObjectMarshalContext.marshal(ObjectMarshalContext.java:59) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XPathNode.marshal(XPathNode.java:401) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XPathObjectBuilder.buildRow(XPathObjectBuilder.java:240) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.buildRow(TreeObjectBuilder.java:118) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.buildRow(TreeObjectBuilder.java:1) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:751) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshalStreamOrWriter(XMLMarshaller.java:1128) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:1079) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:1034) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:684) [eclipselink-2.5.1-RC1.jar:2.5.1.v20130824-981335c]
... 35 more

Answer 1

注意:我是EclipseLink JAXB (MOXy) JAXB (JSR-222) 的领导者和成员专家组。

<小时/>

更新

此问题(请参阅: http://bugs.eclipse.org/416875 )已在 EclipseLink 2.5.1 和 2.6.0 流中修复。从 2013 年 9 月 11 日开始，您将可以通过以下链接下载每晚版本:

• http://www.eclipse.org/eclipselink/downloads/nightly.php

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原始答案

我已确认您所看到的问题。您可以使用以下错误来跟踪我们在此问题上的进展:

• http://bugs.eclipse.org/416875