CODEWITHSUNDEEP
javanullpointerexceptiondozer
shiladitya
shiladitya

Reputation: 2310

Dozer throwing NullPointerException on getClassMap

The exception I am getting is: 

java.lang.NullPointerException
    at org.dozer.MappingProcessor.getClassMap(MappingProcessor.java:1034)
    at org.dozer.MappingProcessor.map(MappingProcessor.java:162)
    at org.dozer.MappingProcessor.map(MappingProcessor.java:124)
    at org.dozer.MappingProcessor.map(MappingProcessor.java:119)
    at org.dozer.DozerBeanMapper.map(DozerBeanMapper.java:111)
    at com.shiladit.CategoryResource.get(CategoryResource.java:120)

I recently upgraded to dozerBeanMapper 5.3.2.

I have defined custom mappings through XML. Where might I be going wrong?

EDIT: I saw line 1034 in MappingProcessor here, where I assume classMappings is null, which probably means the custom XML mappings defined are not getting picked up.

Upvotes: 1

Views: 2692

Answers (1)

Alex M
Alex M

Reputation: 511

If you instantiate the Mapper like this:

Mapper mapper = new DozerBeanMapper(); DestinationObject destObject = mapper.map(sourceObject, DestinationObject.class);

you don't need the file with the mappings. If you instantiate mapper using the production way (dozer documentation ) you need the dozerBeanMapping.xml file with the mapping.

Mapper mapper = DozerBeanMapperSingletonWrapper.getInstance(); DestinationObject destObject = mapper.map(sourceObject, DestinationObject.class);

Otherwise you will receive the exception that you posted. I have seen it debugging the source code of Dozer lib.

Are you instantiating Mapper using DozerBeanMapperSingletonWrapper ?

hope it helps

Upvotes: 0

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