io.lettuce.core.RedisCommandExecutionException: ERR EXEC without MULTI

在使用redisTemplate的事务功能时，代码运行抛出异常：

io.lettuce.core.RedisCommandExecutionException: ERR EXEC without MULTIat io.lettuce.core.internal.ExceptionFactory.createExecutionException(ExceptionFactory.java:147)at io.lettuce.core.internal.ExceptionFactory.createExecutionException(ExceptionFactory.java:116)at io.lettuce.core.protocol.AsyncCommand.completeResult(AsyncCommand.java:120)at io.lettuce.core.protocol.AsyncCommand.complete(AsyncCommand.java:111)at io.lettuce.core.protocol.CommandHandler.complete(CommandHandler.java:747)at io.lettuce.core.protocol.CommandHandler.decode(CommandHandler.java:682)at io.lettuce.core.protocol.CommandHandler.channelRead(CommandHandler.java:599)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:722)at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658)at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584)at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496)at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)at java.lang.Thread.run(Thread.java:748)

出现上面这个异常的原因是在执行redis事务时，执行exec命令时没有检查到multi命令；这是因为redis需要所有命令都在一个连接上提交才能判断到命令是否执行，而默认使用连接池提交命令时不能保证所有命令都在一个连接上提交。为了解决这个问题，在springboot中需要在方法上面添加@Transactional注解，并且方法内设置开启事务支持，方法代码如下：

@Transactional
public void runTransaction() {// 开启事务支持redisTemplate.setEnableTransactionSupport(true);// 表示开启事务redisTemplate.multi();// 执行多个redis命令redisTemplate.opsForValue().set("key1", "value1");redisTemplate.opsForValue().set("key2", "value2");redisTemplate.opsForValue().set("key3", "value3");// 提交执行redisTemplate.exec();// 取消执行// redisTemplate.discard();
}