The following error is printed to console when debugger is about to finish:

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]

It was found by other people as well:

http://www.google.co.uk/search?hl=en&q=AGENT_ERROR_NO_JNI_ENV%28183%29++util.c%3A820&btnG=Google+Search&meta

I am able to reproduce it with  xxxxx  IDE (http://www.netbeans.org/issues/show_bug.cgi?id=85538):

- install  xxxxx  IDE 6.0
- create a java project
- add two lines to main method (System.out.println("aaa");System.out.println("bbb");)
- add  customer  to the first line
- start debugger (F5)
- continue when it stops at  customer . The error message above is SOMETIMES
printed to output window.

Build NB 6.0 20060919-0644, JDK1.6.0-b99, WindowsXP.
Posted Date : 2006-09-29 11:59:37.0

An e-mail comment from Alan:

> It sounds like a timing issue in the shutdown with the agent still running.
Posted Date : 2007-03-13 16:11:28.0

N/A

N/A

Still in 
Sun Microsystems Inc. 1.6.0-rc

i have same errors too...

I get this error also...

Me too...

same

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]

so wot?

Same problem with eclipse :-/

In main method there could be no code and error occures, so there will be (I think) no workaround...

I got similar error.

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]

Happens one in ten times for me too when debugging short programs.  JDK 1.6.0 (build 1.6.0-b105) on Windows XP Professional from Eclipse 3.2.1.  As for others:

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]

Still appears in build 105

Happened to me this morning debugging in NetBeans

Happens to me within IntelliJ IDEA.  I wrote a simple "Hello, World" main() method and tried to debug it.  Got the same exact error message.  

I get this error also...

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]

I first use JDK6.0 to debug my program,but it shown me above, sign

still showing up in 1.6.0-b105
reproduced using MyEclipse Enterprise Workbench 5.5.0 Milestone 1 and Maven 2.0.5
Exact error is same as posted previously, but I'll repost for clarity:
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]

Still in 1.6.0-b105 JDK on WindowsXP
Was able to reproduce it using Maven 2.0.5, so it seems to be related to any sort of debuger, specificly it occurs during the test phase of the Maven build. Exact error follows:
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]

I made a console program with JDI and worked it on JDK1.4 and JDK1.5 without problems. But on JDK1.6,  same message is sometimes found (not always). 
--
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]
--
My environment is:
  - JDK1.6 (build 1.6.0-b105)
  - Windows XP SP2

Eu tambem tive esse erro

Me Too!

same here

tried with JDK1.5, no error 

same for me, netbeans 5.5, jdk1.6.0, WinVista

Same here, fixed it. 
Had a JFrame in my package without  showing it.

Original:
    public static void main(String[] args) {
        // TODO code application logic here
    }

Fixed:
    public static void main(String[] args) {
        // TODO code application logic here
        frameMain fm = new frameMain();
        fm.setVisible(true);
    }

my workaround...

Original:    
public static void main(String[] args) {
        System.out.println("test");
}

Workaround:
    public static void main(String[] args) {
        System.out.println("test");
        System.exit(0);
    }

Still present in 1.6.0_01 U1

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]

Getting this on my Maven projects in Eclipse using Java 6u1, which is preventing my company to adapt Java 6. Same error message as above.

me too
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]

Me too.
I'm trying to programme with Berkley DB,then it occurred.

When will this bug be fixed?
Since last year SEP

Me too.
I'm trying to programme with Berkley DB,then it occurred.

Yeah, I met with the same problem in eclipse 3.2.2 win32
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]

same error; latest java 1.6.0_01-b06; win xp sp2

it happens sometimes while debugging a project. Some projects are debugged with no problems, in others it is quite random. Sometimes debugging works, sometimes not.



jdk 1.6
netbeans 6.0(M9)

Thanks for the workarounds. None of them don't work with Netbeans 6.0(M9), jdk 1.6.

I was able more less to find the workaround in Netbeans though. I just refactor the class the doesn't submit the first breakpoint.

I've already encountered some weird stuff with the netbeans refactoring but this one is just too weird.

got it too.. 
Eclipse SDK
Version: 3.2.2
Build id: M20070212-1330
java.runtime.version=1.6.0_01-b06

The same error:
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]

I'm using Eclipse 3.2.1 running on JDK 1.6.0_02 and this error occures when I finishing debugging my app.

Error AGENT_ERROR_NO_JNI_ENV solution
Workaroud (works for me):
I've make this workaround based in info in this.
Somebody said this could be a timing problem for short programs, so put somewhere in main(...) beginning this code:

    try
    {
      Thread.sleep(100);
    }
    catch(Exception e)
    {}

try to remove all the breakpoints and then to add breakpoints if it's needed.
I had the same message and it doesn't appear anymore!

Same is here 
jdk  1.6.0_02 
Eclipse 3.3 _Maven Plugin

What happens if you use JDK instead of JRE? Is the message still shown?

Got the same error..
Eclipse
jdk  1.6.0_02 

Same here
jdk 1.6.0u2
eclipse 3.3.1

Same issue here:

Product Version: NetBeans IDE 6.0 Beta 1 (Build 200709141330) 
Java: 1.6.0; Java HotSpot(TM) Client VM 1.6.0-b105 
System: Windows XP version 5.1 running on x86; Cp1252; en_US (nb) 

I just encountered this error, and its driving me crazy, i cant compile my project anymore! isnt there ANY workaround??

Eclipse Version: 3.3.0
Build id: M20070921-1145

JDK 1.6.0_03 

As andig2 noted, adding "System.exit(0)" is a very good workaround.

Has someone finally found any kind of workaround?

facing the same issue

Happened on jdk1.6.0_03 netbeans 6.1 rel.29-11-07 in search for icon by image chooser in debugging jswing. 30 nov 07
shahrokh

I am using java 1.6.0_02 on XP Pro
I keep getting it and I don't know why.  I took out all my break points and it still happens.  

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]

I got this problem, too. But the run function can not work anymore.
Environment: Eclipse 3.2.2  + JRE 1.6

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]

I got this problem,too. Eclipse 3.2.2 + JRE 1.6

I got this problem, too. But the run function can not work anymore.
Environment: Eclipse 3.2.2  + JRE 1.6

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]

Exact same problem here

EasyEclipse Server Java
Version: 1.2.2.2
Based on Eclipse build id: M20070212-1330

java version "1.6.0_03"

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]

Me too getting the same error following this. So I am not able to upgrade to JDK6
Exception in thread "main" java.lang.UnsatisfiedLinkError: XXX: The system cannot find the file specified at java.lang.ClassLoader$NativeLibrary.load(Native Method)

System.exit(0);

at the end of main will help

One more here

I have the same issue.

OS: Windows XP, Polish version

Java:
java version "1.6.0_05"
Java(TM) SE Runtime Environment (build 1.6.0_05-b13)
Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode, sharing)

IDE:
Eclipse 3.4

I run my application in Debug mode using Eclipse.

Error message:
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]

I had the same problem using Eclipse Europe.

In the Eclipse was configured Apache TomCat 5.5 and 6.0 and JRE's 1.5 and 1.6.

I solved the problem removing all settings of Apache and JRE in Eclipse and then set back the Apache TomCat JRE 1.5 and 5.5 only within the Eclipse.


[ ]'s,


Trivelato

Still happening... I got it in Eclipse after a shutdown - restart after a point update.  Seems in this case to be related to having reconfigured packages through eclipse.  Committed the changes to SVN, deleted the project, and then checked it out and the problem went away.

I confirm that this bug is still present. I'm using 
java version "1.6.0_11"
Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
Java HotSpot(TM) Client VM (build 11.0-b16, mixed mode, sharing)

It happens in Eclipse 3.4 when trying to debug a Java application. This application is a TCP test client build using Grizzly 1.9.3. The same JVM is used by Eclipse and lauching the Java application. 

This debugging error is STILL unresolved. 

Got the same error when I stopped my tomcat-deployed webapp. I can't believe this has been around for so long without being resolved. How hard can it be? Just fix it.

So, here it is 5/09 and still in circulation. Going for a record?

Got the same error. Using jre6. This bug has been logged more than 2 + years back and still not been fixed.. 

This happens every time I try running my program after commenting out a method call that starts up a thread and the rest of the program depends on that thread. I'm not supposed to be able to crash the JVM during runtime by running my code because that is a security vulnerability. 

Here is my program output:

Monitoring C:\Temp
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]


running:

java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) Client VM (build 11.3-b02, mixed mode, sharing)

same here, in Eclipse  3.4.2. Thread-related. 

i have same errors too...

Hi everyone,

Anything new on this front? I'm having this problem with eclipse 3.3.1.1 jvm 1.6.0_14, and that's really annoying because i'm trying to debug code that should be executed *after* the problem occurs. 

Basically, I've set a shutdown hook which should execute some code to properly close some files. the shutdown hook is bound to a small embedded class Finalizer that calls function terminate in another class. Upon shutting down, the run function of my Finalizer class is called, and the eclipse debugger is able to break at any breakpoint I set there. However, it won't go into the next function (terminate), and if I set a breakpoint inside the terminate function then apparently the debugger never reaches it, and the error is displayed. And since I'm trying to see what's happening in an external library, I can't even use println messages to trace the code... :-(

Any ideas? 

Cheers,

Pagod

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]

Cool
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]

I had this after executing bug-free code:
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]

Got this sometimes:
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]

Same here after a fresh update to JDK 6u18 on Win XP