使用推土机映射列表清单 [英] Map list of lists with Dozer

问题描述

我有一个像这样的对象:

i have an Object like this:

public class Elem
{
    private List<List<String>> elements;

    public List<List<String>> getElements()
    {
        return elements;
    }

    public void setElements(List<List<String>> elements)
    {
        this.elements = elements;
    }
}

• 当然，它还有一个空的ctor，哈希码和等号.

我想深入复制该对象.

我为此使用了推土机.像:

i used dozer for that. like:

DozerBeanMapper beanMapper = new DozerBeanMapper();
Elem dst = beanMapper.map(src, Elem.class)

但是我得到一个错误:

java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl cannot be cast to java.lang.Class
    at org.dozer.util.ReflectionUtils.determineGenericsType(ReflectionUtils.java:364)
    at org.dozer.util.ReflectionUtils.determineGenericsType(ReflectionUtils.java:352)
    at org.dozer.propertydescriptor.GetterSetterPropertyDescriptor.genericType(GetterSetterPropertyDescriptor.java:335)
    at org.dozer.fieldmap.FieldMap.getGenericType(FieldMap.java:145)
    at org.dozer.MappingProcessor.mapCollection(MappingProcessor.java:493)
    at org.dozer.MappingProcessor.mapOrRecurseObject(MappingProcessor.java:422)
    at org.dozer.MappingProcessor.mapFromFieldMap(MappingProcessor.java:330)
    at org.dozer.MappingProcessor.mapField(MappingProcessor.java:276)
    at org.dozer.MappingProcessor.map(MappingProcessor.java:245)
    at org.dozer.MappingProcessor.map(MappingProcessor.java:187)
    at org.dozer.MappingProcessor.map(MappingProcessor.java:124)
    at org.dozer.MappingProcessor.map(MappingProcessor.java:119)
    at org.dozer.DozerBeanMapper.map(DozerBeanMapper.java:111)

有人可以解释一下为什么推土机在列表清单方面存在问题，也许我该如何解决呢?

Can someone please explain why Dozer have problems with list of lists and maybe how can i sort this out?

推荐答案

正如@artbristol所说，这确实是问题. 我在 github推土机中查看了此问题，尽管该问题未在其中列出，但也无法正常运行.

as @artbristol commented, this indeed is an issue in sourceforge dozer. i looked this issue in github dozer, althouge it is not listed in the issues it is not working there as well.

当前，我的解决方法是在映射前将此字段设置为null，然后由我自己映射此字段并使用相应的字段设置这两个变量.

currently my fix is to set this field to null before mapping, then map this field by my self and set both variables with the corresponding fields.

我将在github项目上解决该问题，并尝试提供修复程序.

i will open an issue for that on the github project and will try to contribute a fix.

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