RATIS-2182. Fix some Objects.requireNonNull messages

[jianghuazhu]

What changes were proposed in this pull request?

In Ratis, some of the messaging for Objects.requireNonNull() is not clear enough. The purpose of this PR is to try to fix that.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/RATIS-2182

How was this patch tested?

ci:
https://github.com/jianghuazhu/ratis/actions/runs/11590363184

[jianghuazhu]

@szetszwo , can you help review this PR?
Thanks.

[szetszwo]

+1 the change looks good.

[szetszwo]

@jianghuazhu , thanks a lot for working on this!

TestRaftWithGrpc failed in the previous run. Let's rerun it.

BTW, please see if you have time to fix the remaining zero-copy bugs. We may enable advanced tracing as below and run the test until it fails. Then, check the retain-release trace to see why an object is NOT released properly.

+++ b/ratis-grpc/src/test/java/org/apache/ratis/grpc/MiniRaftClusterWithGrpc.java
@@ -52,7 +52,7 @@ public class MiniRaftClusterWithGrpc extends MiniRaftCluster.RpcBase {
 
   static {
     // TODO move it to MiniRaftCluster for detecting non-gRPC cases
-    ReferenceCountedLeakDetector.enable(false);
+    ReferenceCountedLeakDetector.enable(true);
   }

[jianghuazhu]

@jianghuazhu , thanks a lot for working on this!

TestRaftWithGrpc failed in the previous run. Let's rerun it.

BTW, please see if you have time to fix the remaining zero-copy bugs. We may enable advanced tracing as below and rerun the test until it fails. Then, check the retain-release trace to see why an object is released properly.

+++ b/ratis-grpc/src/test/java/org/apache/ratis/grpc/MiniRaftClusterWithGrpc.java
@@ -52,7 +52,7 @@ public class MiniRaftClusterWithGrpc extends MiniRaftCluster.RpcBase {
 
   static {
     // TODO move it to MiniRaftCluster for detecting non-gRPC cases
-    ReferenceCountedLeakDetector.enable(false);
+    ReferenceCountedLeakDetector.enable(true);
   }

Thanks @szetszwo for the comment and review.
I will try to fix the TestRaftWithGrpc test failure and I will create a new jira later.