Using Caliper 0.5 with instrumented code/JRE

Question

Disclosure: I'm not super familiar with Java, so if anything rings untrue below, please point out

I'm trying to run some microbenchmarks with Caliper for instrumented code, with an instrumented JRE.

I set my JAVA_HOME to point to the instrumented JRE, (so that $JAVA_HOME/bin/java is appropriate). I setup various options using $JAVA_TOOL_OPTIONS (including a bootclasspath and javaagent).

I then run caliper as I usually would (which when using a non-instrumented JRE works fine), and I keep getting the following exception

An exception was thrown from the benchmark code.
java.lang.RuntimeException: failed to start subprocess
    at com.google.caliper.Runner.measure(Runner.java:278)
    at com.google.caliper.Runner.runScenario(Runner.java:229)
    at com.google.caliper.Runner.runOutOfProcess(Runner.java:378)
    at com.google.caliper.Runner.run(Runner.java:97)
    at com.google.caliper.Runner.main(Runner.java:423)
Caused by: java.io.IOException: Cannot run program "java" (in directory "extra/"): error=2, No such file or directory 

I've tried making sure the $JAVA_HOME/bin/ is first in $PATH, tried symlinking $JAVA_HOME/bin/java to the current working directory, but all to no avail.

Anyone have any suggestions? I've probably spent upwards of 5 hours trying to work through this one...

[EDIT]

So I think this might be a broader question, focusing on the instrumented JRE. I ran a simple test, where I create a ProcessBuilder that just runs ls. It works fine with non-instrumented java, but fails with the instrumented version, with the same kind of error (error=2). Any suggestions?

Answer 1

The issue was not with caliper, or broader instrumented JREs, but rather I had not chmod +x jre/bin/* and chmod +x jre/lib/*. After that, the issue was resolved.