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java.lang.StackOverflowError: null	at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:381)	at org.springframework.core.convert.support.GenericConversionService$ConverterCacheKey.hashCode(GenericConversionService.java:464)	at org.springframework.util.ConcurrentReferenceHashMap.getHash(ConcurrentReferenceHashMap.java:214)	at org.springframework.util.ConcurrentReferenceHashMap.getReference(ConcurrentReferenceHashMap.java:246)	at org.springframework.util.ConcurrentReferenceHashMap.get(ConcurrentReferenceHashMap.java:226)	at org.springframework.core.convert.support.GenericConversionService.getConverter(GenericConversionService.java:253)	at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:190)	at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:176)	at org.springframework.data.redis.core.convert.MappingRedisConverter.toBytes(MappingRedisConverter.java:729)	at org.springframework.data.redis.core.convert.MappingRedisConverter.writeToBucket(MappingRedisConverter.java:537)	at org.springframework.data.redis.core.convert.MappingRedisConverter.access$1000(MappingRedisConverter.java:109)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:434)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:395)	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:309)	at org.springframework.data.redis.core.convert.MappingRedisConverter.writeInternal(MappingRedisConverter.java:395)	at org.springframework.data.redis.core.convert.MappingRedisConverter.access$900(MappingRedisConverter.java:109)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:429)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:395)	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:309)	at org.springframework.data.redis.core.convert.MappingRedisConverter.writeInternal(MappingRedisConverter.java:395)	at org.springframework.data.redis.core.convert.MappingRedisConverter.access$900(MappingRedisConverter.java:109)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:429)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:395)	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:309)	at org.springframework.data.redis.core.convert.MappingRedisConverter.writeInternal(MappingRedisConverter.java:395)	at org.springframework.data.redis.core.convert.MappingRedisConverter.writeCollection(MappingRedisConverter.java:518)	at org.springframework.data.redis.core.convert.MappingRedisConverter.access$800(MappingRedisConverter.java:109)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:417)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:395)	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:309)	at org.springframework.data.redis.core.convert.MappingRedisConverter.writeInternal(MappingRedisConverter.java:395)	at org.springframework.data.redis.core.convert.MappingRedisConverter.access$900(MappingRedisConverter.java:109)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:429)	at org.springframework.data.redis.core.convert.MappingRedisConverter$3.doWithPersistentProperty(MappingRedisConverter.java:395)	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:309)