RFR: 8307478: Implementation of Prepare to Restrict The Dynamic Loading of Agents

[Andrey Turbanov]

On Wed, 10 May 2023 11:12:49 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> This is the implementation for JEP 451. There are two parts to this:
> 
> 1. A multi-line warning is printed when a JVM TI or Java agent is loaded into a running VM. For JVM TI, the message is printed to stderr from JvmtiAgent::load. For Java agents, it is printed to System.err (as that may be redirected) in the JPLIS (j.l.instrumentation) implementation.
> 
> 2. If running with -Djdk.instrument.traceUsage or -Djdk.instrument.traceUsage=true, the calls to the Instrumentation API print a trace message and stack trace.

src/java.instrument/share/classes/sun/instrument/InstrumentationImpl.java line 68:

> 66: public class InstrumentationImpl implements Instrumentation {
> 67:     private static final String TRACE_USAGE_PROP_NAME = "jdk.instrument.traceUsage";
> 68:     private final static boolean TRACE_USAGE;

Suggestion:

    private static final boolean TRACE_USAGE;

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PR Review Comment: https://git.openjdk.org/jdk/pull/13899#discussion_r1193098588