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Cannot use a complex object as a key value.
org.springframework.data.mapping.model.MappingException: Cannot use a complex object as a key value.	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeMapInternal(MappingMongoConverter.java:525)	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writePropertyInternal(MappingMongoConverter.java:385)	at org.springframework.data.mongodb.core.convert.MappingMongoConverter$3.doWithPersistentProperty(MappingMongoConverter.java:346)	at org.springframework.data.mongodb.core.convert.MappingMongoConverter$3.doWithPersistentProperty(MappingMongoConverter.java:335)	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:173)	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:335)	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:307)	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.write(MappingMongoConverter.java:272)	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.write(MappingMongoConverter.java:73)	at org.springframework.data.mongodb.core.MongoTemplate.doSave(MongoTemplate.java:718)	at org.springframework.data.mongodb.core.MongoTemplate.save(MongoTemplate.java:708)	at org.springframework.data.mongodb.core.MongoTemplate.save(MongoTemplate.java:704)	at net.bigpoint.globalchat.hazelcast.MongoMapStore.store(MongoMapStore.java:86)	at net.bigpoint.globalchat.hazelcast.MongoMapStore.store(MongoMapStore.java:1)	at com.hazelcast.impl.concurrentmap.MapStoreWrapper.store(MapStoreWrapper.java:114)	at com.hazelcast.impl.ConcurrentMapManager$PutOperationHandler$PutStorer.doMapStoreOperation(ConcurrentMapManager.java:2853)	at com.hazelcast.impl.ConcurrentMapManager$AbstractMapStoreOperation.run(ConcurrentMapManager.java:3560)	at com.hazelcast.impl.executor.ParallelExecutorService$ParallelExecutorImpl$ExecutionSegment.run(ParallelExecutorService.java:212)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)