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java.lang.NullPointerException: 	at com.googlecode.jmapper.operations.complex.AComplexOperation.newInstance(AComplexOperation.java:107)	at com.googlecode.jmapper.operations.complex.AComplexOperation.newInstance(AComplexOperation.java:98)	at com.googlecode.jmapper.operations.recursive.MappedCollectionOperation.sharedCode(MappedCollectionOperation.java:64)	at com.googlecode.jmapper.operations.complex.AComplexOperation.sourceControl(AComplexOperation.java:156)	at com.googlecode.jmapper.operations.complex.AComplexOperation.genericFlow(AComplexOperation.java:133)	at com.googlecode.jmapper.operations.complex.AComplexOperation.write(AComplexOperation.java:89)	at com.googlecode.jmapper.generation.MapperConstructor.mapping(MapperConstructor.java:154)	at com.googlecode.jmapper.generation.MapperConstructor.wrappedMapping(MapperConstructor.java:123)	at com.googlecode.jmapper.generation.MapperConstructor.getMappings(MapperConstructor.java:89)	at com.googlecode.jmapper.generation.MapperGenerator.generateMapperClass(MapperGenerator.java:54)	at com.googlecode.jmapper.generation.MapperBuilder.generate(MapperBuilder.java:88)	at com.googlecode.jmapper.JMapper.createMapper(JMapper.java:458)	at com.googlecode.jmapper.JMapper.(JMapper.java:440)