I was doing manual testing of JMC 6.0.0-541, mostly including flight recordings, but I also think I tried diagnostic commands etc. After leaving JMC running for almost 48 hours, I dump the whole flight recording and the rules say that JMC have generated 27 errors:

"The program generated 27 Errors.
The most common error was java.lang.NoSuchMethodError, which was thrown 20 times. Thrown errors indicate that the runtime experienced abnormal conditions which may be a problem for the application. The following regular expression was used to exclude errors from this rule: (com.sun.el.parser.ELParser\$LookaheadSuccess)."

Either the rule is incorrect and should not report this as a grave incident, or we should make sure that JMC doesn't have these problems. I think the second option is the more correct one...

What errors do we see? Here's a summary of the 27 errors. (Should they be reported separately?)

12: java.lang.NoSuchMethodError on "main":
java.lang.Object.lambda$union$1(Ljava/util/regex/Pattern$CharPredicate;I)Z
java.lang.Object.lambda$and$0(Ljava/util/regex/Pattern$CharPredicate;I)Z
java.lang.Object.lambda$union$2(Ljava/util/regex/Pattern$CharPredicate;Ljava/util/regex/Pattern$CharPredicate;I)Z
java.lang.Object.lambda$union$2(Ljava/util/regex/Pattern$CharPredicate;I)Z
java.lang.Object.lambda$identity$2(Ljava/lang/Object;)Ljava/lang/Object;
java.lang.Object.lambda$comparing$ea9a8b3a$1(Ljava/util/Comparator;Ljava/util/function/Function;Ljava/lang/Object;Ljava/lang/Object;)I
java.lang.Object.lambda$maxBy$1(Ljava/util/Comparator;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
java.lang.Object.lambda$comparing$77a9974f$1(Ljava/util/function/Function;Ljava/lang/Object;Ljava/lang/Object;)I
java.lang.Object.lambda$0(Ljava/lang/Object;)Ljava/lang/Object;
java.lang.Object.lambda$1(I)[Ljava/lang/String;
java.lang.Object.lambda$2(I)[Lcom/oracle/jmc/common/item/IItemFilter;
java.lang.Object.lambda$3(Ljava/util/function/Supplier;)Ljava/util/stream/Stream;

1: java.lang.IncompatibleClassChangeError on "Metadata pre-init thread":
Found class java.lang.Object, but interface was expected

2: java.lang.IncompatibleClassChangeError on "main"
Found class java.lang.Object, but interface was expected

1: java.lang.NoSuchMethodError on "Worker-5":
java.lang.Object.lambda$minBy$0(Ljava/util/Comparator;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;

4: sun.management.AgentConfigurationError on "Attach Listener":
null

6: java.lang.NoSuchMethodError on "Worker-22"
<clinit>

1: java.lang.NoSuchMethodError on "Thread-874"
<clinit>