Instrumenting javascript on stock JDK

[jsyeo]

Am I missing something? I tried the instrumentation examples from the graal repo here: https://github.com/oracle/graal/tree/master/truffle/src/com.oracle.truffle.api.instrumentation.test/src/com/oracle/truffle/api/instrumentation/test/examples but it seems like my instruments are not getting automatically discovered. When I tried to do

context.getEngines().getInstruments(CoverageExample.ID).lookup(Object.class);

I get a null pointer exception because the Map returns null. I am doing this in the context of a stock JDK. Does that change the way instruments are automatically discovered? Is there something special I must do to instrument javascript in my stock JDK?

[boris-spas]

Could you share a bit more about how you build/run the examples?