Why does an attached CRaSH shell throw a NullPointerException when issuing commands?

Question

After attaching a CRaSH shell to a running java process using

> crash.bat pid

starting CRaSH with a JDK, calling the help command returns an error

% help

help: exception: NullPointerException

This means that the commands are not compiled. Why does this happen despite starting CRaSH shell with a JDK?

score 2 · Accepted Answer · answered Jun 29 '16 at 08:38

2

As correctly noted, the CRaSH shell must run with a JDK as it needs the Java compiler.

The same is required when attaching a CRaSH shell. From the CRaSH reference documentation: "CRaSH will hook into the targetted JVM instead of the JVM started by CRaSH"

TL;DR

The process the CRaSH shell is attached to must run using a JDK!

answered Jun 29 '16 at 08:38

AntiTiming

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Add it to your question uning edit Funktion not as an answer – Jens Jun 29 '16 at 08:42
Why? Stackoverflow offers me to answer my own questions in a Q&A style, and this is what I did. – AntiTiming Jun 29 '16 at 11:11
Ok. I not noticed that should be an answer. it Looks like an additial note to you question – Jens Jun 29 '16 at 11:31

Why does an attached CRaSH shell throw a NullPointerException when issuing commands?

1 Answers1