I've a java object(ComponentType.java) that I need to store in Redis. I'm using Redisson as client library. The object has an instance variable (ComponentType) which only has one private parameterized constructor. The ComponentType class has been generated using castor. In Redisson , the serialization part works fine but when I try to deserialize the object, I get the following exception
Exception in thread "main" org.redisson.client.RedisException: Unexpected exception while processing command
at org.redisson.command.CommandAsyncService.convertException(CommandAsyncService.java:324)
at org.redisson.command.CommandAsyncService.get(CommandAsyncService.java:167)
at org.redisson.RedissonObject.get(RedissonObject.java:75)
at org.redisson.RedissonMap.put(RedissonMap.java:256)
at tester.RedissonIPWCTaskTester.populateMap(RedissonIPWCTaskTester.java:67)
at tester.RedissonIPWCTaskTester.main(RedissonIPWCTaskTester.java:51)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.mae.component.valueobject.types.ComponentType]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?)
at [Source: (io.netty.buffer.ByteBufInputStream); line: 1, column: 769] (through reference chain: com.mae.component.valueobject.ComponentVO["_type"])
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:256)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1134)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:298)
at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeOther(BeanDeserializer.java:168)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:135)
at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer._deserializeTypedForId(AsPropertyTypeDeserializer.java:120)
at com.fasterxml.jackson.databind.jsontype.impl.AsPropertyTypeDeserializer.deserializeTypedFromObject(AsPropertyTypeDeserializer.java:91)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeWithType(BeanDeserializerBase.java:1021)
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:493)
The exception is resolved when the constructor of ComponentType is manually modified as below
@JsonCreator
private ComponentType(@JsonProperty("type") int type, @JsonProperty("value") java.lang.String value) {
super();
this.type = type;
this.stringValue = value;
}
I would appreciate help with following questions
Is there a way to generate java classes using castor that supports annotations.
Any other serialization/deserialization technique I could use in Redisson client to support objects having parameterized constructor only.
