Eclipse not finding JRE/JDK...

Well I'm trying to get Eclipse up and running, but whenever I launch it it tells me...
JRE or JDK needed.
No java virtual machine was found after searching:
/usr/share/eclipse/jre/bin/java
How would I go about pointing it to the real path for JRE? Thanks.

Perhaps we should make the JDK/JRE .install files export JAVA_HOME? I haven't looked at the packaging for them, but it seems everyone has a problem eventually relating to this.
Maybe something similar for everything that installs in /opt, since PATH needs refreshing... at least have pacman tell the user to source /etc/profile.
Anyways, OP, please mark your thread as [SOLVED] by editing the first post
Last edited by Ranguvar (2009-03-22 02:05:57)

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Could not find JRE executable

Hello, I am running into problems in Eclipse Mars when trying to run a static web project using the HTTP preview server (as well as dynamic web project running on apache, but one thing at a time), I get this error.
'Launching HTTP Preview at localhost' has encountered a problem.
Could not find JRE executable.
I tried searching these forums and did not find anything so sorry if this has been addressed before. Also tried searching internet but did not find anything that worked for me.
When I run, java -version in terminal it shows:
java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)
Please help

On 07/24/2015 06:36 AM, Jay Sal wrote:
> Hello, I am running into problems in Eclipse Mars when trying to run a
> static web project using the HTTP preview server (as well as dynamic web
> project running on apache, but one thing at a time), I get this error.
>
> 'Launching HTTP Preview at localhost' has encountered a problem.
> Could not find JRE executable.
>
> I tried searching these forums and did not find anything so sorry if
> this has been addressed before. Also tried searching internet but did
> not find anything that worked for me.
>
> When I run, java -version in terminal it shows:
> java version "1.8.0_20"
> Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
> Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)
>
> Please help
What I do is this...
I install exactly the JDK I want to use with Eclipse, usually the
latest. Not merely a JRE, but the JDK. And I do it locally, not for my
host. I let the host's notion of JRE be whatever it wants to be.
I run Eclipse wired up to my own private JDK.
This way, I know what JDK/JRE I'm running Eclipse on and what I'm using
to develop Java code to.

Eclipse not finding libswt-gtk.s0 [solved]

I recently installed Eclipse on my new Arch system and ran into the famous error:
/mnt/home/.eclipse/org.eclipse.platform_4.2.0_1543616141/configuration/org.eclipse.osgi/bundles/193/1/.cp/libswt-gtk-4236.so: /mnt/home/.eclipse/org.eclipse.platform_4.2.0_1543616141/configuration/org.eclipse.osgi/bundles/193/1/.cp/libswt-gtk-4236.so: failed to map segment from shared object: Operation not permitted
I know the that soft-linking /usr/lib/libswt-* into /mnt/home/.swt/lib/linux/x86_64/ fixes the issue, but the problem is that my libswt files are of a different version. They all end in 4234, while the ones eclipse is looking for end in 4236. Is it because OpenJDK and Eclipse from the ArchRepositories are of incompatible versions? Do I have to manually find a matching version of eclipse and install that instead, or is there an easier way?
By the way, here are some information that might be relevant:
This is the original error message:
┌─[20:52:27]──[91/1683]:/mnt/home$
└──>> cat /mnt/home/.eclipse/org.eclipse.platform_4.2.0_1543616141/configuration/1371745338639.log
!SESSION 2013-06-20 20:52:18.353 -----------------------------------------------
eclipse.buildId=M20130204-1200
java.version=1.7.0_40
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments: -os linux -ws gtk -arch x86_64
!ENTRY org.eclipse.osgi 4 0 2013-06-20 20:52:19.894
!MESSAGE Application error
!STACK 1
java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons:
/mnt/home/.eclipse/org.eclipse.platform_4.2.0_1543616141/configuration/org.eclipse.osgi/bundles/193/1/.cp/libswt-gtk-4236.so: /mnt/home/.eclipse/org.eclipse.platform_4.2.0_1543616141/configuration/org.eclipse.osgi/bundles/193/1/.cp/libswt-gtk-4236.so: failed to map segment from shared object: Operation not permitted
no swt-gtk in java.library.path
Can't load library: /mnt/home/.swt/lib/linux/x86_64/libswt-gtk-4236.so
Can't load library: /mnt/home/.swt/lib/linux/x86_64/libswt-gtk.so
/mnt/home/.swt/lib/linux/x86_64/libswt-gtk-4236.so: /mnt/home/.swt/lib/linux/x86_64/libswt-gtk-4236.so: failed to map segment from shared object: Operation not permitted
at org.eclipse.swt.internal.Library.loadLibrary(Library.java:331)
at org.eclipse.swt.internal.Library.loadLibrary(Library.java:240)
at org.eclipse.swt.internal.C.<clinit>(C.java:21)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:63)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:54)
at org.eclipse.swt.widgets.Display.<clinit>(Display.java:133)
at org.eclipse.ui.internal.Workbench.createDisplay(Workbench.java:653)
at org.eclipse.ui.PlatformUI.createDisplay(PlatformUI.java:161)
at org.eclipse.ui.internal.ide.application.IDEApplication.createDisplay(IDEApplication.java:154)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:96)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
This is my version of libswt:
┌─[21:15:21]──[92/1684]:/mnt/home$
└──>> locate libswt
/usr/lib/libswt-atk-gtk-4234.so
/usr/lib/libswt-awt-gtk-4234.so
/usr/lib/libswt-cairo-gtk-4234.so
/usr/lib/libswt-glx-gtk-4234.so
/usr/lib/libswt-gnome-gtk-4234.so
/usr/lib/libswt-gtk-4234.so
/usr/lib/libswt-pi-gtk-4234.so
/usr/lib/libswt-webkit-gtk-4234.so
These are the version I have installed:
┌─[21:20:00]──[109/1701]:/mnt/home$
└──>> pacman -Q swt
swt 4.2.1-2
┌─[21:20:08]──[110/1702]:/mnt/home$
└──>> pacman -Q eclipse
eclipse 4.2.2-1
┌─[21:20:09]──[111/1703]:/mnt/home$
└──>> pacman -Q jdk7-openjdk
jdk7-openjdk 7.u40_2.4.0-1
┌─[21:20:10]──[112/1704]:/mnt/home$
└──>> pacman -Q jre7-openjdk
jre7-openjdk 7.u40_2.4.0-1
Last edited by Untitled (2013-06-23 18:11:53)

Thanks for the reply.
My Arch is just a few days old so I had not updated it yet.
I just ran an update, but the situation is the same.
(Thanks for the heads-up on the symlinking though. I really thought it would be a cool idea!)
Last edited by Untitled (2013-06-20 20:34:14)

Could not find the Main Class. Program will exit. Eclipse w/ JDK 6 RC

Hi all,
I needed to upgrade to JDK 6 RC w/ Eclipse while encountering a java.lang.NullPointer exception.
Now I would like to compile my code with the new VM. I set all preferences to VM Version 6.
Now I have the following Error:
Java Virtual Machine Launcher
Could not find the Main Class. Program will exit.
What do I do now? Attached you find the Error Message.
Bye
Gerrit
================================The System.error looks like:
java.lang.UnsupportedClassVersionError: Bad version number in .class file
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
     at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
     at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
     at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main"

i wouldn't report a nullpointer to sun unless you're fairly confident there's some sort of bug. if main() can't be found it sounds to me like a config issue. if nullpointer, sounds like a code issue. post the code if you want, but i don't think sun will help you debug this.

NitroXInstaller (2.1) can not find JDK or JRE 1.4

Hi,
I have been trying to install NitroX JSP Editor (NitroXInstaller.exe), downloaded today, and keep getting an error saying it can not find a JRE or JDK 1.4 or later.
I have modified my PATH and tested a few permutations to no avail. I only have 1.4 installed on my machine. The path is correct:
E:\tmp\ExpressNitroXFreeInstall-411>java -version
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)
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Patrick

From what I see in the log, it does find the correct JVM but has a problem starting up:
versionInfo: major: 2 minor: 1 micro: 0 buildNumber: 411 release name: M1
java.io.IOException: CreateProcess: D:\Program Files\java\j2sdk1.4.2_06\jre\bin\
java.exe -version error=5
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Win32Process.java:66)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Runtime.java:566)
at java.lang.Runtime.exec(Runtime.java:428)
at java.lang.Runtime.exec(Runtime.java:364)
at java.lang.Runtime.exec(Runtime.java:326)
at com.m7.installer.InstallerUtil.getVersion(InstallerUtil.java:119)
at com.m7.installer.InstallerUtil.checkVersion(InstallerUtil.java:83)
at com.m7.installer.CheckInstallerVM.install(CheckInstallerVM.java:35)
at com.zerog.ia.installer.actions.CustomAction.installSelf(DashoA8113)
I am running W2K with the latest MS updates.

Can not start WebLogic in Eclipse. Error: "Could not find the main class."

I have installed Eclipse 2.0 and WebLogic Server 6.1. and the WebLogc plug in from GENUITEC (and jdk1.3.1_04, on Win2K Server). After I have done the configuration, the WebLogic start/stop buttons are integried into the Eclipse Toolbar, but when I click on the start button to start Weblogic, it pops up a dialog box "Java Virtual Machine Launcher" with message: "Could not find the main class. Program will exit!"
Starting WebLogc Server from the Start panel works fine.
Does any one have seen this before or have a suggestion what I should do?
Many many thanks in advance.
Huan

Weblogic must be started with a full JDK; otherwise
JSPs and dynamic EJB stubs could not be deployed. The
error message
indicates you are attempting to use a JRE. Configure
Eclipse JRE to point to a JDK. The product
documentation will help you with this process. It does not work for me. :-(
I have tried JDK 1.3.1 and 1.4.1: same result: I get a "Could not find the main class: Program will exit"
For free expert support please consider contacting
Genuitec at [email protected] If just want any
answer ask a newsgroup.
WayneI'll try the support at '[email protected]' :)
Michel
Michel Szybist
[email protected]
Fax: +33 (0)173729897
SMS: http://www.szybist.net/

Eclipse give following error :could not find Java 2 runtime environment

When I try to start eclipse it is giving me following error could not find Java 2 runtime environment.It was working fine untill I installed a new verson of eclipse although I am not whethar that is the source of problem.
When i give java -version command in command prompt it shows
Registry key 'Software\JavaSoft\Java Runtime Environment\CurrentVersion'
has value '1.4', but '1.6' is required.
Error: could not find java.dll
Error: could not find Java 2 Runtime Environment.
My java Home ,classpath , and path are all set as I say it was earliar woking fine.
Please Help.

I know this is a relatively old post, but some people can stumble on this page when doing a search for this problem.
Anyway, I ran into this on my PC after I installed Sybase which had an older jre.
Solution:
1. Run regedit
2. Look for Java Runtime Environment
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3. Modify the value and change it to the correct version number. (in your case, you would have changed it from 1.4 to 1.6).
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JAVA_HOME points to a JDK and not a JRE.

Hi,
I am using Redhat Linux 9. From root i can able to find the java -version as
java version "1.4.2_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_06-b03)
Java HotSpot(TM) Client VM (build 1.4.2_06-b03, mixed mode)
But when i run jboss_home/bin$ sh run.sh i am getting the error as follows,
[root@arc bin]# sh run.sh
run.sh: Missing file: /root/usr/java/j2sdk1.4.2_06/lib/tools.jar
run.sh: Unexpected results may occur. Make sure JAVA_HOME points to a JDK and not a JRE.
run.sh: line 181: /root/usr/java/j2sdk1.4.2_06/bin/java: No such file or directory
I set Java_Home, JBOSS_HOME but why i am getting these error. Please let me know.

Don't know nothing about JBoss but, when JBoss starts up does it switch to it's own username?, i.e not root, if it did it probably wouldn't be able to access root's home dir to get to java, as root's home dir is usually not readable by any other user, just a hunch.

Fat Jar Export: Could not find class-path entry for 'C:Java/jdk/mysql-connector-java-

ok friends,
have a normaly running project in eclipse and want to create a jar file...i tried ewerythin in ->export but nothing function
i wanted to create a runnable jar file but that error ecures:
JAR export finished with warnings. See details for additional information.
Exported with compile warnings: ICQJJ/src/ICQJJ.java
Jar export finished with problems. See details for additional infos.
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ok, i am using a mysql db und using the driver mysql-connector-java-5.1.8-bin.jar....
i improted this jar file like this run -> run configuration -> classpath -> add external jar....
pls help me

That looks like it might be a binary-distribution JAR that you should unjar. The actual JAR for the classpath is probably inside it.

Getting this error :NB: JAVA_HOME should point to a JDK not a JRE

HI All
I've installed jdk1.5.0_06 in windows enviroment.i've correctly set the java_home path for it.
Apart from it i've installed two servers one is Weblogic 9.1 and Tomcat 5.5 and NetBeans 5.5.1.
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By why it is so that we bin folder was not selected,
because when i earlier installed weblogic then at
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"Could not find the main class. Program will exit."
If I compile and run the source myself it works fine, so it must be a setting in Eclipse somewhere...
It doesn't work, even when I put the class in the default package...
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It was only the basic Hello-World-concept;
public class Game extends JFrame {
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     private static final long serialVersionUID = 1L;
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Installation problem: I'm not finding ...\eclipse\configuration\org.eclipse.osgi\bundles\15\1\.cp\lib

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You can find the JAR in question, ReportViewer.jar, in ..\eclipse\plugins\com.businessobjects.sdks.jrc.11.8.0_11.8.1.v671\lib as well. Note that "11.8.1.v671" above denotes the version number, which increases with every update; you should always use the latest version.

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I've downloaded the latest full version of Designer (10.1.2.3), but getting installation error: Could not find an installed JDK, SCM Java Tools may not work until registry
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3. install the Designer 10.1.2.3 patch to the Developer suite home.When I try to do this at C:\oracle\product\Ora10gDSR2, I get a message OUI-10137: An Oracle Home with name OUIHome already exits at C:\OraHome (a directory that doesn't exist) please specify another name for Oracle Home.
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Regards
Philippe

i wouldn't report a nullpointer to sun unless you're fairly confident there's some sort of bug. if main() can't be found it sounds to me like a config issue. if nullpointer, sounds like a code issue. post the code if you want, but i don't think sun will help you debug this.

How can I find JRE installed or not thro' script

hi,
for my purpose, if any one install JRE, if another version of JRE or same version exits already, then I want to show error message to user that JRE is already installed.
Is it possible?.
can I find JRE is already in system or not (specifically in linux) using any script.

Why would you want to do this?

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