lettuce infinite print log - Unexpected exception during request: java.lang.NullPointerException

[wbzj1110]

preface

When I encountered this problem, I found that the issue or discussion of lettuce did not have this problem. So I opened a discussion to record it for the convenience of those who encounter the same problem in the future.

I don't know if lettuce can fix this problem on the 5.3.x version to facilitate users who currently use spring-boot 2.3.9RELEASE. After all, the latest spring-boot realse that adapts to spring-cloud is as follows:
https://github.com/spring-cloud/spring-cloud-release/wiki/Spring-Cloud-Hoxton-Release-Notes

the issue as follows:
spring-projects/spring-boot#25857

background

spring-boot 2.3.9 RELEASE
default lettuce 5.3.6 RELEASE
redis cluster mode

some bean use @PostConstruct and method contain redis action ，This is the key to reproducing the problem。

@Service
@Slf4j
public class TestA   {


    @PostConstruct
    public void init(){
		//redis action
    }

}

expression

log infinite print Unexpected exception during request: java.lang.NullPointerException，as follows：

print very quickly。

reasons

lettuce 5.3.6 RELEASE has a bug about use trace，the key code ，as follows：

when use full link tracking related modules， lettuce does not first determine whether it is empty， and this is the reason。

solutions

Either one will do

1）、pom add lettuce new version
lettuce fix it later，but in it new version，like 6.1.0.RELEASE，the code as follows：
https://github.com/lettuce-io/lettuce-core/blob/main/src/main/java/io/lettuce/core/protocol/CommandHandler.java#L460

2）、user code change
use @order or implement ApplicationRunner rather than use @PostConstruct

suggest

1. spring-boot
   spring-boot 2.3.9 release may use new version of lettuce，at least not lettuce 5.3.6 RELEASE 。
   lettuce infinite print log - Unexpected exception during request: java.lang.NullPointerException spring-projects/spring-boot#25857 (comment)
   Obviously spring-boot needs to wait for lettuce to solve this problem.

2）lettuce fix 5.3.6 RELEASE this bug。

[mp911de]

There's indeed a potential loophole that commands may not be wrapped into TracedCommand. Do you want to submit a pull request to fix the issue on main? We'll take care of the backports.

[wbzj1110]

OK，I will do it later。☺

[wbzj1110]

#1703
hi @mp911de this pull request has been merged. Are there any plans to build the new 5.3.X RELEASE ?
Spring-boot newest RELEASE is 2.3.9 .it has this bug. As follows spring-boot need us to build new version,and they will update the dependency version.
spring-projects/spring-boot#25857

[mp911de]

We can ship a release by next week.

[wbzj1110]

OK，thks~