GC.class_stats command requires -XX:+UnlockDiagnosticVMOptions

This error comes, when you try to get the class meta data statistics using jcmd command.

How to resolve the problem?

Launch application using '-XX:+UnlockDiagnosticVMOptions' argument.

Example

java -classpath . -XX:+UnlockDiagnosticVMOptions HelloWorld

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