Question

当我尝试使用Xstream来编组我的一个groovy域类Employee时，我收到以下错误。员工拥有很多雇员的技能，属于技能和员工

以下是相关的Xstream代码

employeeInstance = new Employee();
XStream xstream = new XStream();

Xstream.alias("employee", Employee.class);

String xml = xstream.toXML(employeeInstance);

Employee类将employeeDesiredSkills明确定义为ArrayLists。我不确定错误信息在说什么。我只知道“C Development”是在数据库中保存为EmployeeDesiredSkill的项目之一

2010-09-21 18:13:13,911 [http-8080-1] ERROR errors.GrailsExceptionResolver  - Cannot    reference implicit element
---- Debugging information ----
implicit-element    : C Development
referencing-element : /employee/employeeDesiredSkills/storedSnapshot/EmployeeDesiredSkill/skill/roleSkills/owner
-------------------------------
com.thoughtworks.xstream.core.AbstractReferenceMarshaller$ReferencedImplicitElementException: Cannot reference implicit element
---- Debugging information ----
implicit-element    : C Development
referencing-element : /employee/employeeDesiredSkills/storedSnapshot/EmployeeDesiredSkill/skill/roleSkills/owner

-------------------------------
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:58)
    at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:157)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:148)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.visit(AbstractReflectionConverter.java:118)
    at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:129)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:100)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshal(AbstractReflectionConverter.java:58)
    at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:68)
    at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:78)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.marshallField(AbstractReflectionConverter.java:157)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.writeField(AbstractReflectionConverter.java:148)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$2.visit(AbstractReflectionConverter.java:118)
    at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:129)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doMarshal(AbstractReflectionConverter.java:100)

Answer 1

鉴于异常，您的Employee元素可能包含需要在XStream对象中明确别名的字段。

我无法提供任何具体的建议，因为我对您的域名和环境没有很好的理解。但是，您可能会尝试弄乱别名，直到您做对了。

作为一种调试方法，您可以尝试在所有Employee属性上使用XStream的omitField()，然后逐个删除它们，直到找出导致问题的方法。你可以从那里深入了解。

ERROR errors.GrailsExceptionResolver - 无法引用隐式元素

1 个答案: