如何使用Spring-data-Redis实现Redis Multi-Exec

Question

所有Spring配置都已正确编写.非Multi-Exec Redis操作完美运行.

@Autowired
@Qualifier("stringRedisTemplate")
StringRedisTemplate template;

void test(){
  template.multi();
  template.boundValueOps("somevkey").increment(1);
  template.boundZSetOps("somezkey").add("zvalue", timestamp);
  template.exec();
}

通过Junit Test运行上面的代码后,抛出了异常.

    org.springframework.data.redis.RedisSystemException: Unknown exception; nested exception is org.springframework.data.redis.RedisSystemException: Unknown jedis exception; nested exception is java.lang.NullPointerException
        at org.springframework.data.redis.connection.jedis.JedisUtils.convertJedisAccessException(JedisUtils.java:93)
        at org.springframework.data.redis.connection.jedis.JedisConnectionFactory.translateExceptionIfPossible(JedisConnectionFactory.java:155)
        at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58)
        at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
        at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
        at $Proxy66.appendUserStream(Unknown Source)
        at com.uniu.test.repository.StreamCacheRepositoryTest.testAppendUserStream(StreamCacheRepositoryTest.java:23)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
        at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
        at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
        at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
        at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
        at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
        at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
        at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
        at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
        at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
    Caused by: org.springframework.data.redis.RedisSystemException: Unknown jedis exception; nested exception is java.lang.NullPointerException
        at org.springframework.data.redis.connection.jedis.JedisConnection.convertJedisAccessException(JedisConnection.java:119)
        at org.springframework.data.redis.connection.jedis.JedisConnection.exec(JedisConnection.java:523)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.data.redis.core.CloseSuppressingInvocationHandler.invoke(CloseSuppressingInvocationHandler.java:58)
        at $Proxy70.exec(Unknown Source)
        at org.springframework.data.redis.core.RedisTemplate$1.doInRedis(RedisTemplate.java:416)
        at org.springframework.data.redis.core.RedisTemplate$1.doInRedis(RedisTemplate.java:412)
        at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:162)
        at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:133)
        at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:121)
        at org.springframework.data.redis.core.RedisTemplate.exec(RedisTemplate.java:412)
        at com.uniu.repository.impl.StreamCacheRepositoryRedisImpl.appendUserStream(StreamCacheRepositoryRedisImpl.java:37)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
        at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
        ... 33 more
    Caused by: java.lang.NullPointerException
        at redis.clients.jedis.BinaryTransaction.exec(BinaryTransaction.java:31)
        at org.springframework.data.redis.connection.jedis.JedisConnection.exec(JedisConnection.java:521)
        ... 54 more

我检查redis服务器,上面两个命令已经执行,结果是正确的.所以问题出现在代码的最后一行(template.exec()).当底层的JedisClient试图从EXEC获得multibulk响应时,它似乎抛出了NullPointerException

我使用spring-data-redis 1.0.0.RELEASE感谢您的帮助.

Answer 1

异常的原因可能是Spring模板实现没有为.multi()和重用相同的连接.exec().您可以尝试execute()通过回调使用:

private RedisTemplate template = ...;

template.execute(

  new RedisCallback() {

    @Override
    public Object doInRedis(RedisConnection connection)
      throws DataAccessException {

      connection.multi();

      //do whatever you need, like deleting and repopulating some keys

      connection.expire(CHANNEL_KEY.getBytes(), EXPIRE_SECS);
      connection.exec();
      return null;
    }

  }

);

Answer 2

template.setEnableTransactionSupport(true);

也许你可以使用它来启用交易

Answer 3

彼得是对的.你需要将它放入SessionCallback.

以下是使用Spring Data Redis进行事务的快速摘要:

https://github.com/eric-wu/dashboard/wiki/3.-Redis-Transactions-via-Spring-Data-Redis

对于您的情况,向下滚动并查看"使用WATCH,MULTI和EXEC进行乐观锁定".