ERROR: JDWP Unable to get JNI 1.2 environment

Question

I get this error after debugging in Eclipse. The debug is successful though.

ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2
JDWP exit error AGENT_ERROR_NO_JNI_ENV(183):  [../../../src/share/back/util.c:820]

What does it mean?

I face the exact same problem from within NetBeans 6.1 when attempting to debug into a piece of code that uses both the network, and image API. Were you trying to use either the network, or image API by any chance? — Everyone, Apr 15 '11 at 13:15
I was not using the Image API, for sure. What do you mean by using the network? I was using sockets if that's what you mean. — Carlos Blanco, Apr 15 '11 at 13:38

score 81 · Answer 1 · edited Dec 08 '15 at 20:27

81

Just add System.exit(0); to the end of your main method.

That's all you have to do.

edited Dec 08 '15 at 20:27

Quackers

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answered Apr 27 '11 at 09:50

Vasile Surdu

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I tried this, and it worked. But then I took it out, and it still worked. From the accepted solution above it appears it could be a timing issue which makes this very hard to reproduce faithfully all the time. – Xonatron Jan 08 '12 at 23:28
This works for me.. I'm also running java version "1.6.0_29" Java(TM) SE Runtime Environment (build 1.6.0_29-b11) – angryITguy Feb 08 '12 at 05:25
I get the same result as @Xonatron. Weird! – Federer Jan 11 '15 at 22:05
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sounds like fixing a threading issue by adding sleep here and there – Newtopian Nov 17 '15 at 15:26
@Xonatron What if the error is not throwing from the main class ? – Mohammadreza Khatami Aug 07 '18 at 10:47

Pascal Thivent · Accepted Answer · 2010-02-09T00:08:12.007

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Looks like http://bugs.sun.com/view_bug.do?bug_id=6476706 which has low priority and is still not fixed. Definitely a Mustang bug but no clear explanation (seems to occur pretty randomly according to the bug reporters on top of that).

edited Feb 09 '10 at 00:08

answered Feb 09 '10 at 00:00

Pascal Thivent

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On that URL I get a message "This bug is not available." Is the bug number correct? Or has the bug been removed? – MarnixKlooster ReinstateMonica May 18 '11 at 08:48
@MarnixKlooster, the bug shows up for me, along with details about it. – Xonatron Jan 08 '12 at 23:27
@EaterOfCorpses And now it's back :D – Boann Nov 27 '13 at 02:44
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Glad to see that as of November 2015, this is still not fixed. – Stacky Nov 29 '15 at 11:38
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Hello! Man from 2018 here. I just faced the bug :p – Swastik Raj Ghosh Jun 08 '18 at 09:43
Hello from 2019, need less to say I came here after getting the same error – RAHUL ROY Apr 09 '19 at 18:29
2019 April still its not fixed – Varun Apr 11 '19 at 13:47
Love the resolution in the link `Resolution: Won't Fix` :D – XtremeBaumer Aug 01 '19 at 11:34
Jan 2020 Still not Fixed :/ Also another project in the same eclipse work-space with same configurations work.. – Shoaeb Jan 10 '20 at 12:22

score 5 · Answer 3 · answered Feb 08 '10 at 23:59

5

It's apparently a JVM bug. It's harmless and unpredictable.

answered Feb 08 '10 at 23:59

bmargulies

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Hmm, not so harmless, it caused my program to spontaneously fail. – Steve Bennett Mar 11 '11 at 03:53
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Um, generally it means 'something else caused your program to fail' and then it does this on the way out, but I suppose there could be something new. – bmargulies Mar 11 '11 at 11:55
It is supposed to happen during the shutdown of the JVM. So your program was done anyway. – Florian F Dec 06 '20 at 22:38

score 3 · Answer 4 · edited Aug 28 '16 at 18:02

Happens on something as simple as this tutorial

//trim spaces
String s2 = "Welcome!";
int len1 = s2.length();
System.out.println(len1);
String s3 = s2.trim();
System.out.println(s3.length());

Happens if run program too fast multiple times so something to do with system performance?

ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return code = -2
JDWP exit error AGENT_ERROR_NO_JNI_ENV(183):  [../../../src/share/back/util.c:838]

score 0 · Answer 5 · answered May 22 '12 at 11:07

@Everyone I'm facing this problem using the image API reading and writing files over the network, when I run the program working with local files this doesn't happen. After verifiying my results I confirmed that it really doesn't do any harm (at least on my debugging). Now that I'm reading this post I stopped looking into it.

score 0 · Answer 6 · answered Feb 18 '16 at 23:46

I have noticed this occurs when I am using a workspace stored on my USB drive and sometimes on my work's network. It is not a major issue and doesnt seem to have any effect on the execution of any of my programs. I tested @Vasile Surdu's solution of addingSystem.exit(0); to the end of the main method and it works. Another solution is to restart eclipse which works for me most of the time.

ERROR: JDWP Unable to get JNI 1.2 environment

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