Error when trying to put data to Redis cache.

[janitham]

java.lang.NullPointerException: map key can't be null
	at org.redisson.RedissonMap.checkKey(RedissonMap.java:152) ~[redisson-3.6.5.jar:na]
	at org.redisson.RedissonMap.getAsync(RedissonMap.java:633) ~[redisson-3.6.5.jar:na]
	at org.redisson.RedissonMap.get(RedissonMap.java:251) ~[redisson-3.6.5.jar:na]
	at org.hibernate.cache.redis.client.RedisClient.get(RedisClient.java:87) ~[hibernate-redis-2.3.2.jar:na]
	at org.hibernate.cache.redis.hibernate5.regions.RedisTransactionalDataRegion.get(RedisTransactionalDataRegion.java:73) ~[hibernate-redis-2.3.2.jar:na]
	at org.hibernate.cache.redis.hibernate5.strategy.ReadOnlyRedisEntityRegionAccessStrategy.get(ReadOnlyRedisEntityRegionAccessStrategy.java:65) [hibernate-redis-2.3.2.jar:na]
	at org.hibernate.engine.internal.CacheHelper.fromSharedCache(CacheHelper.java:32) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.event.internal.DefaultLoadEventListener.getFromSharedCache(DefaultLoadEventListener.java:651) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.event.internal.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:595) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:462) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.internal.SessionImpl.access$2600(SessionImpl.java:164) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2696) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.internal.SessionImpl.get(SessionImpl.java:975) [hibernate-core-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1075) [hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1039) [hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_60]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_60]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_60]
	at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_60]
	at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:304) [spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at com.sun.proxy.$Proxy69.find(Unknown Source) [na:na]
	at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findById(SimpleJpaRepository.java:235) [spring-data-jpa-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_60]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_60]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_60]
	at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_60]
	at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:377) [spring-data-commons-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200) [spring-data-commons-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:629) [spring-data-commons-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:593) [spring-data-commons-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:578) [spring-data-commons-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) [spring-data-commons-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294) ~[spring-tx-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:135) ~[spring-data-jpa-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61) ~[spring-data-commons-2.0.6.RELEASE.jar:2.0.6.RELEASE]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) [spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at com.sun.proxy.$Proxy72.findById(Unknown Source) ~[na:na]
	at com.example.ehcache.Application.printAll(Application.java:43) ~[classes/:na]
	at com.example.ehcache.Application.run(Application.java:30) ~[classes/:na]
	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:797) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
	at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:781) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:335) ~[spring-boot-2.0.1.RELEASE.jar:2.0.1.RELEASE]
	at com.example.ehcache.Application.main(Application.java:23) ~[classes/:na]

application.properties

# Caching
spring.jpa.properties.hibernate.cache.use_second_level_cache=true
spring.jpa.properties.hibernate.cache.use_query_cache=true
spring.jpa.properties.hibernate.cache.region.factory_class=org.hibernate.cache.redis.hibernate5.SingletonRedisRegionFactory
spring.jpa.properties.hibernate.cache.region_prefix=hibernate
spring.jpa.properties.hibernate.cache.provider_configuration_file_resource_path=hibernate-redis.properties

pom.xml

<!--Cache-->
        <dependency>
            <groupId>com.github.debop</groupId>
            <artifactId>hibernate-redis</artifactId>
            <version>2.3.2</version>
        </dependency>
        <!-- JDK 1.8+ compatible -->
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson</artifactId>
            <version>3.6.5</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.0.12.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.0.12.Final</version>
        </dependency>