RedisUtils.isUnlinkAvailable bug

[sojw]

Affects Version(s): \5.1.3

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hi. there

we are upgrading to springboot 2.1.3.

since then, NE have occurred in the redis lock part of spring-integration.
we looked for the cause.

• spring-integration/spring-integration-redis/src/main/java/org/springframework/integration/redis/util/RedisUtils.java

  Line 64 in d21e8f0

  int majorVersion = Integer.parseInt(info.getProperty(VERSION_PROPERTY).split("\\.")[0]);

we have modified version of our redis server info and returned it.
ex) "111.111.111.111:7000.redis_version" -> "4.0.9"

If we handle this redis_version in the isUnlinkAvailable function, an NE occurs.
I think we need to fix this part.
If it does not fit in the pattern, try to return it as the default value by try / catch.

currently, we have downgraded to 5.1.2 and are running normally.