背景：

springboot 2.6.2

redisson-spring-boot-starter 3.16.4

由于本地的redis是没有密码的，线上的redis是有密码的，在该版本下在配置文件中配置了spring.redis.password会导致本地报错，即使配置文件中对该配置值为空：

Caused by: org.redisson.client.RedisException: ERR Client sent AUTH, but no password is set. channel: [id: 0xffdc4bd7, L:/127.0.0.1:56453 - R:localhost/127.0.0.1:6379] command: (AUTH), params: (password masked)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:370)
	at org.redisson.client.handler.CommandDecoder.decodeCommand(CommandDecoder.java:198)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:137)
	at org.redisson.client.handler.CommandDecoder.decode(CommandDecoder.java:113)
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
	at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:366)
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
	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)
	... 4 common frames omitted

解决办法：

可以引入一个config自定义器，当配置文件中该值为空时将密码设置为null，这样就会走无密码认证

@Bean
    public RedissonAutoConfigurationCustomizer redissonAutoConfigurationCustomizer() {
        return configuration -> {
            if (StringUtils.isEmpty(configuration.useSingleServer().getPassword())) {
                configuration.useSingleServer().setPassword(null);
            }
        };
    }