"Java Virtual Machine Launcher- could not find the main class"

My system is working very slowly, especially during start-up.
During the start-up, a small pop-up appears that reads:
"Java Virtual Machine Launcher
could not find the main class. Program will exit"
Would this cause slow operation?
How do I fix this?
My system is Windows XP Professional, version 2002 SP1; Intel Pentium III Processor, 647 MHz, 128 RAM
Thanks for whatever help you can offer.
Lou
My experience level is
Beginner
Novice
Intermediate X
Expert
Guru

That popup message indicates that some program has tried to start the Microsoft JVM. When this occurs at startup, it often means that a spyware (or worse) program is operating. Go to this Sun site for more information.
http://java.com/en/download/help/spyware.jsp

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Java Virtual Machine Launcher could not find the main class - program will

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Something is being automatically started when the pc starts. Assuming Windows, to see what it is, learn to use the msconfig program:
http://www.google.com/search?q=how+to+use+msconfig
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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
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     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)
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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.
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Hello
I am trying to install openmq on vista and having problems. I've had the same problem with a nightly build of 4.3 and stable 4.2 build. The install kicks off fine until I get to the part where the install happens and then I get:
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jre 1.7.0
jdk 1.7.0
jre 1.6.0.7
jre 1.6.0.7 and jre 1.6.0.7
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Much obliged
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Hi,
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login as the user you are installing as.
cd to the directory you are installing into.
touch foo // to see if you can write to the dir.
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If you create a new project in JDeveloper.
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public static void main(String[] args) {
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[\pre]
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Bye
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================================The System.error looks like:
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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.

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Hi,
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Hi,
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Hi,
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java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)
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Error Message
=========
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ib\ide-boot.jar;..\..\jdev\lib\xmleditor.jar;..\..\ide\lib\oicons.jar;..\..\..\j
dbc\lib\ojdbc5.jar;..\..\jlib\jewt4.jar;..\..\jlib\share.jar;..\..\sqldeveloper\
lib\jle2.jar oracle.ide.boot.Launcher
Exception in thread "main" java.lang.NoClassDefFoundError: oracle/ide/boot/Launc
her
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at java.lang.ClassLoader.loadClass(Unknown Source)
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OS
==============
MS Windows 7 Home Premium
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===================
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AddJavaLibFile ../../jdev/lib/xmleditor.jar
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Edited by: sivapara on Feb 16, 2011 1:08 PM

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Thanks
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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.
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you must check with the classpath
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When I try to load Java Access Bridge 1.1 I receive the following error:
Could not find the main class. Program will exit.
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Executable JAR file: Could not find the main class.

Hello,
I have a problem with making an executable JAR file.
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Could not find the main class. Program will exit.
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Thanks in advance!
Bye!

Yes,
I tried:
jar xvf MaakVisueelSchema.jar
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Huan

Weblogic must be started with a full JDK; otherwise
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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/

Executable JAR sometimes could not find the main class.

I have a little task, that seems to be trivial- but I have no idea how to solve the current problem.
With a double click on my jar, a message comes up: JVM could not find the main class. Program will exit.
The executable JAR is an export result from eclipse, with a manifest file that contains the right entry to the main class.
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Christiane

OK, I ll try to explain it in other words:
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I d like to start it with a double click from the Win-Explorer, not from command line!
As a result a dialog from "Java Virtual machine Launcher" displays
"Could not find the main class. Programm will exit."
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wrong:
javaw -cp OrderAlertTest.jar OrderAlertParentDialog
-> Error dialog appears
correct:
javaw -cp OrderAlertTest.jar apo.order.OrderAlertParentDialog
-> OK
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at java.io.FileInputStream.<init>(Unknown Source)
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at
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"Java Virtual Machine Launcher- could not find the main class"

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