Could not find the main class ! exception.

hi,
I create one java project. for this I am using netbeans 5.
I try to run the project jar file stff.jar. When run using "java -jar stff.jar " , it throws error "could not find the main class. program will exit".
I am extracting this jar file, in manifest, main class is set.
i.e, in manifest, Main-Class: ems.emsFrame.
ems is my folder ,inside it main class kept.
here, emsFrame is my main class where " public static void main (String args[])" is located.
I am also, set the class path for that class folder(ems) and run.
The same error ("could not find the main class. program will exit") occured.
Why this error occured.
also,I am uninstall the jdk and reinstall .
whats my problem.
bye

yes sir.
In projects, inside it, in Libraries ,the SNMPInquisitor.jar is located.
inside that jar, snmp package is located.
but, when build and run, there is no problem sir.
Only when i try to run the stff.jar file (java -jar stff.jar), that time only the exception thrown.
when I double click that jar, it show, "could not find the main class. program will exit". But, I am adding the main class in manifest. when i open manifest.mf, it show, Main-Class: ems.emsFrame.
but, when i run jar thro' cmd window, it shows,
Exception in thread "main" java.lang.NoClassDefFoundError: snmp/SNMPGetException
at ems.emsFrame.<init>(emsFrame.java:1163)
at ems.emsFrame.<clinit>(emsFrame.java:1155).
i am still trying it.

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Could not find the main class: oracle.ide.boot.Launcher. Program will exit

Hi,
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ie. C:\Program Files (x86)\Java\jre6\ and C:\Program Files\Java\jdk1.6.0_24, still did not work.
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java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
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Error Message
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When I enter full path and continue, still it continue to prompt and ask the same input.
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dbc\lib\ojdbc5.jar;..\..\jlib\jewt4.jar;..\..\jlib\share.jar;..\..\sqldeveloper\
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Exception in thread "main" java.lang.NoClassDefFoundError: oracle/ide/boot/Launc
her
Caused by: java.lang.ClassNotFoundException: oracle.ide.boot.Launcher
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
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Could not find the main class: oracle.ide.boot.Launcher. Program will exit.
OS
==============
MS Windows 7 Home Premium
sqldeveloper.conf
===================
SetSkipJ2SDKCheck true
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AddJavaLibFile ../../ide/lib/oicons.jar
AddJavaLibFile ../../jlib/jewt4.jar
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Edited by: sivapara on Feb 16, 2011 1:08 PM

I was able to resolve this issue by performing following.
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OLD (Wrong) : IncludeConfFile ../../jdev/bin/ide.conf
NEW (Correct) : IncludeConfFile ../../ide/bin/ide.conf
After making above change in the sqldeveloper.conf file. Save and close it. Restart SQLDeveloper. You will not get the error anymore.
Thanks
Ravi

Execute jar file: "could not find the main class" program will terminate

Hey,
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* GoListener.java
* Created on 12. september 2007, 21:48
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package grandmaster;
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import javax.swing.*;
import java.util.Vector;
import java.util.StringTokenizer;
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* @author Computer
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* Created on 12. september 2007, 21:07
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
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NetBeans questions should be posted to the NB site. It has mailing lists and associated forums.
This tutorial from the NB site addresses running programs outside of NB
http://www.netbeans.org/kb/articles/javase-deploy.html
When you compare objects, use ".equals()" and reserve == for comparing values.

Could not find the main class (with every jar)

This isn't a developer question. I get the error Could not find the main class with every jar I try to open (for example the jar downloaded from https://gjar.dev.java.net/ gives the same problems - and I don't think there is something wrong with that JAR). It isn't a problem with the jar or MANIFEST because the same jar works fine on my laptop. So there is something wrong with my JRE installation, but what?
I tried to remove and reinstall the JRE 6 Update 18 but that didn't work. When I run the JAR with command line java -jar "file.jar" it works fine, but if I dubbelclick on it I get the error message (and it's irritating me).
I'm a bit desperate so I hope that someone here can help me ;)
Thanks in advanced

hai T.B.M ... Sorry to post here... I know that i posted my question in wrong thread..but i dont have another solution to contact with you.. I had seen your answers which are really excellent and helped to do my project..
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Could not find the main class: SearchExcel. Program will exit. ????

sekic0429{uabudd_milou}[w10/rbssw/2.0] pwd
/tmp/MyJava/jexcelapi
sekic0429{uabudd_milou}[w10/rbssw/2.0] printenv CLASSPATH
/tmp/MyJava/excelapi:/app/jdk/1.6.0_16/jre/lib:/app/jdk/1.6.0_16/lib
sekic0429{uabudd_milou}[w10/rbssw/2.0] ls
build ExcelSearch.java index.html resources SearchExcel.java~ tutorial.html
docs ExelSearch.java~ jxl.jar SearchExcel.class src workbook.dtd
ExcelSearch.class formatworkbook.dtd jxlrwtest.xls SearchExcel.java TestSpecification.xls
sekic0429{uabudd_milou}[w10/rbssw/2.0] javac -extdirs . ExcelSearch.java
sekic0429{uabudd_milou}[w10/rbssw/2.0]
sekic0429{uabudd_milou}[w10/rbssw/2.0] java ExcelSearch
Exception in thread "main" java.lang.NoClassDefFoundError: ExcelSearch
Caused by: java.lang.ClassNotFoundException: ExcelSearch
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: ExcelSearch. Program will exit.
sekic0429{uabudd_milou}[w10/rbssw/2.0] cat ExcelSearch.java
import java.io.File;
import java.io.IOException;
import java.util.Date;
import jxl.*;
import jxl.read.biff.BiffException;
public class ExcelSearch
public static void main(String[] args)
try
Workbook workbook = Workbook.getWorkbook(new File("TestSpecification.xls"));
catch (IOException e)
e.printStackTrace();
catch (BiffException e)
e.printStackTrace();
Regards Peter, hope for answer

r035198x wrote:
Where is SearchExcel.class?Excellent question, though I think I spotted a problem with the cp supplied.
Note the documentation for -cp state (in part)
For example, if directory foo contains a.jar and b.JAR, then the class path element foo/* is expanded to a A.jar:b.JAR, except that the order of jar files is unspecified.So instead of this..
java -cp /tmp/MyJava/excelapi:/app/jdk/1.6.0_16/jre/lib:/app/jdk/1.6.0_16/lib SearchExcel..try this..
java -cp /tmp/MyJava/excelapi/*:/app/jdk/1.6.0_16/jre/lib:/app/jdk/1.6.0_16/lib SearchExcelNotes:
1) Adding the JRE classes to the classpath should not be necessary, but I left the rest of the cp unaltered to highlight the one specific difference I am suggesting.
2) When posting code, code snippets, HTML/XML or input/output, please use the code tags. The code tags help retain the indentation and formatting of the sample. To use them, select the sample text and click the CODE button.
If that still fails, tell us more specifically where the SearchExcel class is by copy/pasting the output (within code tags) of the command..
prompt>jar -tvf mysearchexcel.jarWhere, of course, you replace 'mysearchexcel.jar' with the actual Jar name it is supposed to be located in.
Edit 1:
Changed JavaDocs -> documentation.
Edited by: AndrewThompson64 on Jan 11, 2010 7:12 PM

Could not find the main class. Program will exit!

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at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
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US101

There could be several reasons for getting this "Could not find main class" error message. From your stack trace it looks like the class javax/media/ControllerListener is not in your class path. Make sure your manifest file has a line like this:
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HTH,
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Could not find the main class: projectRFID.ProjectGUI. Program will exit.

Hello,
I'm quite new in Java. I have an application with GUI. When I'm using Eclipse version 3.4.0 to run the application, all it is working perfect.
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at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
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root@slax:~/workspace#
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I hope somebody can help me!
Thank you!

cojogrizli wrote:
The structure of my project in Eclipse is src/project/files.java and in jar file is src/files.java bin/class.java Dati/ and META-INF/.That's wrong. You don't need the .java files in the jar (but you can have them, if you want, they are just not used by Java).
And each .class file must be in a directory that reflects its package. So in your example ProjectGUI.class must be in the directory projectRFID/ inside the .jar file.

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Created-By: 1.5.0 (Sun Microsystems Inc.)
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2. qtjambi-4.4.3_01.jar
3. qtjambi-win32-msvc2005-4.4.3_01.jar
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Please tell me whats wrong in that i can also give you the app.jar file please let me know the email id ..

JAR file: could not find the main class.

I have been working with Java satisfactorily for about two years.
Installed a bigger hard disk.
Installed Windows XP.
Downloaded java.
Downloaded java jdk 1.6.0_07
Downloaded java3d 1.5.2
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A new project, a new class with an existing and working java file. It did function in eclipse.
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... next...next filled the field Main Class
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Executing a jar file means it will not read from the CLASSPATH environment variable. I learnt this the hard way a few weeks ago and I had to resort to different measures to work around it.
Your problem does sound weird, but check that the last line in your manifest file is a new line. If it's not, the manifest is not read and parsed correctly.
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Cheers

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Java virtual machine Launcher
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     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$100(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Exception in thread "main"
ANY IDEA???
JDK = 1.4 (also tried with compiler comliance lever 5.0) nothing :-(

I had a look through the SwingX stuff and decided that it looks like the project has stalled (the main site says something about being overhauled - but it's been like that for ages).
I'm using JCalendar - there's recently been a new release and it's brilliant.
Check out http://www.toedter.com/en/jcalendar/.
Hope this helps.
Paul C.

Could not find the main class: examples/Fibo. Program will exit. HELP!!!!!

I am trying to write a program that prints out the first 10 numbers of the fibonacci sequence. Unfortunately I am unsuccessful so far and getting nothing but errors. I am using jasmin and I have no idea what I am doing as this is my first time ever dealing with this language. I am not 100% sure but I am under the assumption is assembly but I only have luck doing a search by Java Virtual Machine. Can anybody help me with the following error. Any help will be much appreciated. Thanks in advance!!!
C:\Users\Chris\Desktop\jasmin\jasmin>java -cp . examples/Fibo
Exception in thread "main" java.lang.VerifyError: (class: examples/Fibo, method:
*main signature: ([Ljava/lang/String;)V) Expecting to find object/array on stack*
*Could not find the main class: examples/Fibo. Program will exit.*
Here is my written program
.class public examples/Fibo
.super java/lang/Object
; standard initializer
.method public <init>()V
aload_0
invokenonvirtual java/lang/Object/<init>()V
return
.end method
.method public static main([Ljava/lang/String;)V
    .limit locals 5
     .limit stack 10
    getstatic java/lang/System/out Ljava/io/PrintStream;
     astore_1
     bipush 10
     istore_2
     iconst_0
     dup
     ;invokevirtual java/io/PrintStream/println(I)V;
     ;invokestatic java/lang/String/valueOf(C)Ljava/lang/String;
     invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
     istore_3
     bipush 1
     istore 4
     L0:
     iload 3
     dup
     iload 4
     dup
     ;invokestatic java/lang/String/valueOf(C)Ljava/lang/String;
     invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V
     iadd
     iload 4
     istore 3
     istore 4
     iload_2
     ifeq L1
     iinc 2 -1
     goto L0
     L1:
     return
.end method
OK guys I give up...I redid the program and its working better now.
*Note to moderators....if you please, you may delete this. Thanks!!!!!*
Edited by: chris52204 on Apr 12, 2009 3:21 PM

cojogrizli wrote:
The structure of my project in Eclipse is src/project/files.java and in jar file is src/files.java bin/class.java Dati/ and META-INF/.That's wrong. You don't need the .java files in the jar (but you can have them, if you want, they are just not used by Java).
And each .class file must be in a directory that reflects its package. So in your example ProjectGUI.class must be in the directory projectRFID/ inside the .jar file.

Help Me Urgent...Error: "Could not find the main class. Program will exit."

Am using Eclipse 3.3.2
I have a project called: SWDS
Initially i have JDK1.6 installed in my system. At this time the project is running succesfully.
But when i removed(uninstalled and environment path also removed) JDK 1.6 and installed JDK 1.5 and path also given.
No changes are made in the project code.
When I Run the project SWDS then showing an alert "*Could not find the main class. Program will exit*" and then getting error messages like:
{color:#ff0000}java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Exception in thread "main"{color}
Pleez help me how to rectify this error.

The manifest file is missing from the project.
I searched the net and read about the manifest file and I saw that it is supposed to be located in META-INF/MANIFEST.MF. I suppose that means project_root/META-INF/MANIFEST.MF, right ?
I am asking this because I haven't got that much experience in Java and this is the first time I hear about a manifest file.
Does anyone have any Ideea how I add a manifest file to a project with Eclipse SDK? I searched the menus and I didn't find anithing of such sort... o
Does Eclipse have support for editing manifest files at all?

Could not find the main class. & java.lang.NoClassDefFound error:

sir / madam
I am facing problems with j2ksdk1.4.0 beta instalation on my windows 2000 advance server.
while installing pops up a message saying could not find the main class.
while using java or javac it says
Exception in thread main
java.lang.NoClassDefFound error:
com/sun/tools/javac/main
even when double clicking java plugin from the control panel
I get the Java virtual machine launcher saying could not find the main class.
I don't have any other java sdk installed.
And i have my environment variables (classpath, path and java_home) set correctly.
this same j2sdk1.4.0 version is installed in the windows 98 system and it's working fine.
Kindly do help me to solve this problem.
eagerly awaiting for your response.
Thanking you
Sajeev Nair
[email protected]

you must check with the classpath
please see that you have not repeated %classpath%
at the end of the class path like you do in win98.
similiarly with %path%
in win2000 it is automatically taken care off.

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.

Could not find the main class. Program will fail

Hi I have just downloaded jdeveloper latest 10.2.1 full production version and unzipped and installed.
When i launch jdevw.exe it comes up with a pop up error saying "Could not find the main class. Program will fail"
clickin ok launches jdeeloper.. i developed a sinple jsp file and try to run it, now it says that fatal error in messages.
Help please..
Ram

Now a new error.
Internal compilation error, terminated with a fatal exception
I changed installation from c:\program files to c:\ drive .. i got rid of the pop up error !!
but when I create a simple jsp file, in a new workspace/project.. and run it.. it doesnot launch OC4J..
In the messages pallette it says
Internal compilation error, terminated with a fatal exception
in the jdev console..
java.lang.NullPointerException
at oracle.jdeveloper.model.JProjectConfiguration.getJdkClassPath(JProjec
tConfiguration.java:484)
at oracle.jdeveloper.model.JProject.getClassPath(JProject.java:743)
at oracle.jdevimpl.webapp.jsp.JspQuickCompiler.translate(JspQuickCompile
r.java:225)
at oracle.jdevimpl.webapp.model.content.DocumentInfoManager$DocumentInfo
Impl$BackgroundErrorCheckingTimerTask.run(DocumentInfoManager.java:919)
at java.util.TimerThread.mainLoop(Timer.java:432)
at java.util.TimerThread.run(Timer.java:382)
Wht the hell is goin on folks.. is this tool that bad.. .. I just downloaded and trying to evaluate it for my company ..!!

Could not find the main class ! exception.

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