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java.lang.NullPointerException at com.fasterxml.jackson.databind.type.ResolvedRecursiveType.equals(ResolvedRecursiveType.java:103) at com.fasterxml.jackson.databind.type.TypeBindings$AsKey.equals(TypeBindings.java:458) at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:940) at com.fasterxml.jackson.databind.util.LRUMap.get(LRUMap.java:68) at com.fasterxml.jackson.databind.type.TypeFactory._fromClass(TypeFactory.java:1211) at com.fasterxml.jackson.databind.type.TypeFactory._fromParamType(TypeFactory.java:1384) at com.fasterxml.jackson.databind.type.TypeFactory._fromAny(TypeFactory.java:1154) at com.fasterxml.jackson.databind.type.TypeFactory._fromVariable(TypeFactory.java:1409) at com.fasterxml.jackson.databind.type.TypeFactory._fromAny(TypeFactory.java:1164) at com.fasterxml.jackson.databind.type.TypeFactory._fromParamType(TypeFactory.java:1380) at com.fasterxml.jackson.databind.type.TypeFactory._fromAny(TypeFactory.java:1154) at com.fasterxml.jackson.databind.type.TypeFactory._fromParamType(TypeFactory.java:1380) at com.fasterxml.jackson.databind.type.TypeFactory._fromAny(TypeFactory.java:1154) at com.fasterxml.jackson.databind.type.TypeFactory._resolveSuperClass(TypeFactory.java:1285) at com.fasterxml.jackson.databind.type.TypeFactory._fromClass(TypeFactory.java:1246) at com.fasterxml.jackson.databind.type.TypeFactory._fromAny(TypeFactory.java:1150) at com.fasterxml.jackson.databind.type.TypeFactory.constructType(TypeFactory.java:618) at com.fasterxml.jackson.databind.cfg.MapperConfig.constructType(MapperConfig.java:290) at com.fasterxml.jackson.databind.cfg.MapperConfig.introspectClassAnnotations(MapperConfig.java:320) at com.fasterxml.jackson.databind.ser.BasicSerializerFactory.createTypeSerializer(BasicSerializerFactory.java:264) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.findPropertyTypeSerializer(BeanSerializerFactory.java:324) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory._constructWriter(BeanSerializerFactory.java:817) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.findBeanProperties(BeanSerializerFactory.java:611) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.constructBeanSerializer(BeanSerializerFactory.java:390) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.findBeanSerializer(BeanSerializerFactory.java:273) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory._createSerializer2(BeanSerializerFactory.java:225) at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.createSerializer(BeanSerializerFactory.java:159) at com.fasterxml.jackson.databind.SerializerProvider._createUntypedSerializer(SerializerProvider.java:1272) at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1222) at com.fasterxml.jackson.databind.SerializerProvider.findValueSerializer(SerializerProvider.java:499) at com.fasterxml.jackson.databind.SerializerProvider.findTypedValueSerializer(SerializerProvider.java:697) at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:270) at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3672) at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3048) at com.fasterxml.jackson.databind.CircularGenericsTest.testWrite(CircularGenericsTest.java:20)