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java.lang.InstantiationException: null at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48) at java.lang.reflect.Constructor.newInstance(Constructor.java:526) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147) at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:76) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:249) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:230) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:190) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:186) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:77) at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doWith(MongoTemplate.java:2121) at org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(MongoTemplate.java:1760) at org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1577) at org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:497) at org.springframework.data.mongodb.repository.query.AbstractMongoQuery$SingleEntityExecution.execute(AbstractMongoQuery.java:307) at org.springframework.data.mongodb.repository.query.AbstractMongoQuery.execute(AbstractMongoQuery.java:107) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:421) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:381) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) at com.sun.proxy.$Proxy101.findByKey(Unknown Source)