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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._resolveSuperInterfaces(TypeFactory.java:1298)	at com.fasterxml.jackson.databind.type.TypeFactory._fromClass(TypeFactory.java:1243)	at com.fasterxml.jackson.databind.type.TypeFactory._fromAny(TypeFactory.java:1150)	at com.fasterxml.jackson.databind.type.TypeFactory._resolveSuperInterfaces(TypeFactory.java:1298)	at com.fasterxml.jackson.databind.type.TypeFactory._fromClass(TypeFactory.java:1247)	at com.fasterxml.jackson.databind.type.TypeFactory._fromAny(TypeFactory.java:1150)	at com.fasterxml.jackson.databind.type.TypeFactory.constructType(TypeFactory.java:622)	at com.fasterxml.jackson.databind.introspect.AnnotatedClass.resolveType(AnnotatedClass.java:228)	at com.fasterxml.jackson.databind.introspect.AnnotatedMethod.getParameterType(AnnotatedMethod.java:157)	at com.fasterxml.jackson.databind.introspect.AnnotatedWithParams.getParameter(AnnotatedWithParams.java:105)	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector._addCreators(POJOPropertiesCollector.java:457)	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.collectAll(POJOPropertiesCollector.java:303)	at com.fasterxml.jackson.databind.introspect.POJOPropertiesCollector.getJsonValueMethod(POJOPropertiesCollector.java:172)	at com.fasterxml.jackson.databind.introspect.BasicBeanDescription.findJsonValueMethod(BasicBeanDescription.java:224)	at com.fasterxml.jackson.databind.ser.BasicSerializerFactory.findSerializerByAnnotations(BasicSerializerFactory.java:350)	at com.fasterxml.jackson.databind.ser.BeanSerializerFactory._createSerializer2(BeanSerializerFactory.java:210)	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.writeValue(ObjectMapper.java:3030)