ModelMapper LinkedHashMap to LinkedHashMap ArrayIndexOutOfBoundsException

Question

我一直在从事一个项目，其中一些新的状态数据被提取到一个对象中，并通过ModelMapper对当前的对象状态数据进行应用。字段被匹配并自动更新，这是很好的。

现在，我以List>的形式添加了一些更复杂的数据。

一切都在破裂。

以下是简化的代码：

public class TypeA {     
       private List<Map<String, String>> listOfMap;
      
}

public class TypeB {     
       private List<Map<String, String>> listOfMap;
      
}
 
public class Test {
       public static void main(String[] args) {           
        TypeA typeA = new TypeA();      
        TypeB typeB = new TypeB();
        
        Map<String, String>  m1 = new LinkedHashMap();
        m1.put("test1","machin");
        m1.put("test2","truc");
        m1.put("test3","bidule");
        
        Map<String, String>  m2 = new LinkedHashMap();
        m2.put("test1","machin");
        m2.put("test2","truc");
        
        List<Map<String, String>> l1 = new ArrayList<Map<String, String>>();        
        l1.add(m1);
        
        List<Map<String, String>> l2 = new ArrayList<Map<String, String>>();        
        l2.add(m2);
        
        typeA.setListOfMap(l1);     
        typeB.setListOfMap(l2);   // this can be set to null to fix the problem  
        
        ModelMapper modelmapper = new ModelMapper();
            
             try {
                    modelmapper.map(typeA, typeB); 
             } catch (Exception e) {
                    e.printStackTrace();
             }
       }
}

如果typeB listOfMap是空的，一切正常。

但是，如果我们已经在listOfMap中有了另一个对象typeB上的值列表。

然后，当我们试图将A映射到B时，我们会得到以下错误：

1) Converter org.modelmapper.internal.converter.MapConverter@1f32e575 failed to convert java.util.LinkedHashMap to java.util.LinkedHashMap.
 
1 error
       at org.modelmapper.internal.Errors.throwMappingExceptionIfErrorsExist(Errors.java:380)
       at org.modelmapper.internal.MappingEngineImpl.map(MappingEngineImpl.java:81)
       at org.modelmapper.ModelMapper.mapInternal(ModelMapper.java:573)
       at org.modelmapper.ModelMapper.map(ModelMapper.java:447)
       at modelmapper_debug.Main.main(Main.java:30)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
       at org.modelmapper.internal.converter.MapConverter.convert(MapConverter.java:59)
       at org.modelmapper.internal.converter.MapConverter.convert(MapConverter.java:1)
       at org.modelmapper.internal.MappingEngineImpl.convert(MappingEngineImpl.java:303)
       at org.modelmapper.internal.MappingEngineImpl.map(MappingEngineImpl.java:110)
       at org.modelmapper.internal.converter.MergingCollectionConverter.convert(MergingCollectionConverter.java:59)
       at org.modelmapper.internal.converter.MergingCollectionConverter.convert(MergingCollectionConverter.java:1)
       at org.modelmapper.internal.MappingEngineImpl.convert(MappingEngineImpl.java:303)
       at org.modelmapper.internal.MappingEngineImpl.map(MappingEngineImpl.java:110)
       at org.modelmapper.internal.MappingEngineImpl.setDestinationValue(MappingEngineImpl.java:242)
       at org.modelmapper.internal.MappingEngineImpl.propertyMap(MappingEngineImpl.java:188)
       at org.modelmapper.internal.MappingEngineImpl.typeMap(MappingEngineImpl.java:152)
       at org.modelmapper.internal.MappingEngineImpl.map(MappingEngineImpl.java:115)
       at org.modelmapper.internal.MappingEngineImpl.map(MappingEngineImpl.java:72)
       ... 3 more

这里发生了什么事？

我能修正这段代码使ModelMapper映射List>类型正确吗？

thx全

Answer 1

当时，我正在使用modelmapper依赖性版本2.3.8运行这段代码。

更新到最新版本2.4.2解决了这个问题。

    ModelMapper modelmapper = new ModelMapper();
        
    try {
        System.out.println(typeB.getListOfMap().toString());
        modelmapper.map(typeA, typeB); 
        System.out.println(typeB.getListOfMap().toString());
    } catch (Exception e) {
        e.printStackTrace();
    }

如预期的那样：

[{test1=machin, test2=truc}]  
[{test1=machin, test2=truc, test3=bidule}]