I get NullPointerException when I try to add mappings by creating my custom mapper in some container-managed objects. I tried it in @Stateless EJB service and @RequestScoped rest service. The error is similar and occurs in line:
modelMapper.addMappings(skipCdeMap);
Is it a bug? I assume that mapper is trying to do some reflection stuff on managed bean and because of that get NullPointerException.
This is my code:
PropertyMap<ObjectAbcDto, ObjectAbc> skipCdeMap =
new PropertyMap<ObjectAbcDto, ObjectAbc>() {
protected void configure() {
skip().setObjectCde(null);
}
};
modelMapper.addMappings(skipCdeMap);
This is the error:
13:37:03,453 ERROR [stderr] (default task-12) org.modelmapper.ConfigurationException: ModelMapper configuration errors:
13:37:03,453 ERROR [stderr] (default task-12)
13:37:03,453 ERROR [stderr] (default task-12) 1) Error reading class com.app.SomeRestEasyService$1
13:37:03,453 ERROR [stderr] (default task-12)
13:37:03,453 ERROR [stderr] (default task-12) 2) Failed to configure mappings
13:37:03,454 ERROR [stderr] (default task-12)
13:37:03,454 ERROR [stderr] (default task-12) 2 errors
13:37:03,454 ERROR [stderr] (default task-12) at org.modelmapper.internal.Errors.throwConfigurationExceptionIfErrorsExist(Errors.java:241)
13:37:03,454 ERROR [stderr] (default task-12) at org.modelmapper.internal.ExplicitMappingBuilder.build(ExplicitMappingBuilder.java:206)
13:37:03,454 ERROR [stderr] (default task-12) at org.modelmapper.internal.TypeMapImpl.addMappings(TypeMapImpl.java:72)
13:37:03,454 ERROR [stderr] (default task-12) at org.modelmapper.internal.TypeMapStore.getOrCreate(TypeMapStore.java:101)
13:37:03,454 ERROR [stderr] (default task-12) at org.modelmapper.ModelMapper.addMappings(ModelMapper.java:93)
13:37:03,454 ERROR [stderr] (default task-12) at com.app.SomeRestEasyService.create(SomeRestEasyService.java:129)
13:37:03,454 ERROR [stderr] (default task-12) at com.app.SomeRestEasyService$Proxy$_$$_WeldClientProxy.create(Unknown Source)
[...]
13:37:03,459 ERROR [stderr] (default task-12) Caused by: java.lang.NullPointerException
13:37:03,459 ERROR [stderr] (default task-12) at org.modelmapper.internal.ExplicitMappingBuilder.validateVisitedMappings(ExplicitMappingBuilder.java:236)
13:37:03,459 ERROR [stderr] (default task-12) at org.modelmapper.internal.ExplicitMappingBuilder.visitPropertyMap(ExplicitMappingBuilder.java:227)
13:37:03,459 ERROR [stderr] (default task-12) at org.modelmapper.PropertyMap.configure(PropertyMap.java:380)
13:37:03,459 ERROR [stderr] (default task-12) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
13:37:03,459 ERROR [stderr] (default task-12) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
13:37:03,459 ERROR [stderr] (default task-12) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
13:37:03,460 ERROR [stderr] (default task-12) at java.lang.reflect.Method.invoke(Method.java:606)
13:37:03,460 ERROR [stderr] (default task-12) at org.modelmapper.internal.ExplicitMappingBuilder.build(ExplicitMappingBuilder.java:194)
13:37
I can answer on my own question. My assumptions was correct. When I created PropertyMap class in Pojo or in its own, dedicated class - mappings worked well. So I suppose that my previous error occurs because of reflection which ModelMapper does on class in which PropertyMap was created. If it is some Menaged Bean that would result with NullPointerException.