Installing Oracle client 10.2: Could not find the main class...

What should I configure on my PC to get Oracle Client for Win 32 working? When I try to install the client (10.2) setup.exe cannot start JVM and fails with the message Could not find the main class.
I use Windows XP.

Hello,
What's version of Java installed on your machine? Download and install JDK 1.5 and/or put jdk in PATH variable.
Regards

Similar Messages

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

Hi,
I have installed Oracle11g_win64_11gR1, Database and Client.
The issue is unable to invoke "sqldeveloper", getting the following error message. Could you please help ?
FYI. I have already downloaded and installed installed JRE and JDK.
ie. C:\Program Files (x86)\Java\jre6\ and C:\Program Files\Java\jdk1.6.0_24, still did not work.
C:\Users\oracle>java -version
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)
Let me know, if you need more information. Here is the error message.
Error Message
=========
(1) if I invoke sqldeveloper, directly from the location " C:\app\oracle\product\11.1.0\db_1\sqldeveloper\sqldeveloper\bin " using explorer, I do get error message
"Unable to find a java Virtual Machine.
To point to a location of java Virtual machine please refer to the Oracle9i JDeveloper Install Guide ( jdev/install.html)"
(2) if I invoke sqldeveloper, directly from the locationC:\app\oracle\product\11.1.0\client_1\sqldeveloper, it prompts me to enter "full path for java.exe".
When I enter full path and continue, still it continue to prompt and ask the same input.
(3) if I invoke sqldeveloper from from command prompt using the batch file "sqldeveloper.bat"
C:\Users\oracle>C:\app\oracle\product\11.1.0\client_1\sqldeveloper\sqldeveloper\
bin\sqldeveloper.bat
C:\Users\oracle>java -Xmx512M -Xverify:none -XX:JavaPriority10_To_OSPriority=10
-XX:JavaPriority9_To_OSPriority=9 -Doracle.ide.util.AddinPolicyUtils.OVERRIDE_F
LAG=true -Dsun.java2d.ddoffscreen=false -Dwindows.shell.font.languages= -Dide.co
nf="sqldeveloper.conf" -Dide.home.dir.name=.sqldeveloper -classpath ..\..\ide\l
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
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)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: oracle.ide.boot.Launcher. Program will exit.
OS
==============
MS Windows 7 Home Premium
sqldeveloper.conf
===================
SetSkipJ2SDKCheck true
IncludeConfFile ../../jdev/bin/ide.conf
AddVMOption -Dapple.laf.useScreenMenuBar=true
AddVMOption -Dcom.apple.mrj.application.apple.menu.about.name="SQL_Developer"
AddVMOption -Dcom.apple.mrj.application.growbox.intrudes=false
AddVMOption -Dcom.apple.macos.smallTabs=true
AddVMOption -Doracle.ide.util.AddinPolicyUtils.OVERRIDE_FLAG=true
AddJavaLibFile ../../jdev/lib/xmleditor.jar
AddJavaLibFile ../../ide/lib/oicons.jar
AddJavaLibFile ../../jlib/jewt4.jar
AddJavaLibFile ../../jlib/share.jar
AddJavaLibFile ../ide/jlib/xmlef.jar
AddJavaLibFile ../../sqldeveloper/lib/jle2.jar
AddJavaLibFile ../../sqldeveloper/lib/oracle.dbtools.logging.jar
AddVMOption -Dsun.java2d.ddoffscreen=false
AddVMOption -Dwindows.shell.font.languages=
IncludeConfFile sqldeveloper-nondebug.conf
SetJavaHome C:\Program Files\Java\jdk1.6.0_24
Edited by: sivapara on Feb 16, 2011 1:08 PM

I was able to resolve this issue by performing following.
1. Go to the location where sqldeveloperW.exe is being executed from.
2. You will find a file sqldeveloper.conf in that location. Edit this file and change the value of IncludeConfFile to point to actual place. For me following were old and new values.
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

"Could not find the main class" Error While installing 11g in windows 7

Dear All,
I am getting error message while installing oracle 11g R1(32 bit) on Windows 7(32 bit)
I have downloaded from oracle website only..
After Clicking the OUI I am getting the Error Message pop up is "Could not find the main class.Program will exit"
I don't know what is the reason behind this error .
what would be the reason for this error..
Pls help me....
By
Muthu

I think you need to download oracle software again...
Oracle Universal Installer - Could not find main class

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 ..!!

[newbie] [error] Could not find the main class

This program does not compile on the command line, however they run within Eclipse 3.4.2 IDE. JDK does not seem to be installed in the usual path under C:\Program Files\Java..jdk, however I have installed the following which I presume should include the jdk:
Eclipse 3.4.2
SunGlass Fish Enterprise Server 2.1.1
Any ideas? Is this a bug?
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Jon\My Documents\My Archives\My eBooks\Java\JavaDev>di
r
Volume in drive C has no label.
Volume Serial Number is D80F-8634
Directory of C:\Documents and Settings\Jon\My Documents\My Archives\My eBooks\J
ava\JavaDev
08/12/2009 11:31 <DIR> .
08/12/2009 11:31 <DIR> ..
28/04/2009 18:32 <DIR> corejava8
08/12/2009 10:42 2,505 Java CLI.lnk
20/04/2008 11:44 241 Java Platform SE 6.url
28/04/2009 18:32 <DIR> myCode Snippets
08/12/2009 11:43 480 TestPassword.java
3 File(s) 3,226 bytes
4 Dir(s) 39,149,547,520 bytes free
C:\Documents and Settings\Jon\My Documents\My Archives\My eBooks\Java\JavaDev>pr
ompt $g
dirVolume in drive C has no label.
Volume Serial Number is D80F-8634
Directory of C:\Documents and Settings\Jon\My Documents\My Archives\My eBooks\J
ava\JavaDev
08/12/2009 11:31 <DIR> .
08/12/2009 11:31 <DIR> ..
28/04/2009 18:32 <DIR> corejava8
08/12/2009 10:42 2,505 Java CLI.lnk
20/04/2008 11:44 241 Java Platform SE 6.url
28/04/2009 18:32 <DIR> myCode Snippets
08/12/2009 11:43 480 TestPassword.java
3 File(s) 3,226 bytes
4 Dir(s) 39,149,547,520 bytes free
javac TestPassword.java'javac' is not recognized as an internal or external command,
operable program or batch file.
java testPassword.javaException in thread "main" java.lang.NoClassDefFoundError: testPassword/java
Caused by: java.lang.ClassNotFoundException: testPassword.java
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)
Could not find the main class: testPassword.java. Program will exit.
type testPassword.javaimport java.io.Console;
public class TestPassword {
public static void main(String[] args) {
Console cons;
char[] passwd = {'x','x'};
if ((cons = System.console()) != null &&
(passwd = cons.readPassword("[%s]", "Password:")) != null);
if (passwd.equals("joe"))
{System.out.println("password is fine");}
//Clear password array (Security note)
java.util.Arrays.fill(passwd, ' ');
javap'javap' is not recognized as an internal or external command,
operable program or batch file.
javac'javac' is not recognized as an internal or external command,
operable program or batch file.
echo $PATH$PATH
echo %PATH%PATH
echo %PATH%C:\Program Files\PC Connectivity Solution\;C:\WINDOWS\system32;C:\WINDOWS;C:\WIN
DOWS\system32\WBEM;c:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\WINDO
WS\system32\WindowsPowerShell\v1.0;c:\Program Files\Microsoft SQL Server\100\Too
ls\Binn\VSShell\Common7\IDE\;c:\Program Files\Microsoft SQL Server\100\Tools\Bin
n\;c:\Program Files\Microsoft SQL Server\100\DTS\Binn\;c:\Program Files\Microsof
t Visual Studio 9.0\Common7\IDE\PrivateAssemblies\;C:\Sun\SDK\bin;C:\PROGRA~1\MI
CROS~2\Office12
DIRVolume in drive C has no label.
Volume Serial Number is D80F-8634
Directory of C:\Documents and Settings\Jon\My Documents\My Archives\My eBooks\J
ava\JavaDev
08/12/2009 11:31 <DIR> .
08/12/2009 11:31 <DIR> ..
28/04/2009 18:32 <DIR> corejava8
08/12/2009 10:42 2,505 Java CLI.lnk
20/04/2008 11:44 241 Java Platform SE 6.url
28/04/2009 18:32 <DIR> myCode Snippets
08/12/2009 11:43 480 TestPassword.java
3 File(s) 3,226 bytes
4 Dir(s) 39,149,498,368 bytes free
javaw TestPassword.java
dirVolume in drive C has no label.
Volume Serial Number is D80F-8634
Directory of C:\Documents and Settings\Jon\My Documents\My Archives\My eBooks\J
ava\JavaDev
08/12/2009 11:31 <DIR> .
08/12/2009 11:31 <DIR> ..
28/04/2009 18:32 <DIR> corejava8
08/12/2009 10:42 2,505 Java CLI.lnk
20/04/2008 11:44 241 Java Platform SE 6.url
28/04/2009 18:32 <DIR> myCode Snippets
08/12/2009 11:43 480 TestPassword.java
3 File(s) 3,226 bytes
4 Dir(s) 39,149,494,272 bytes free
java HelloWorld.javaException in thread "main" java.lang.NoClassDefFoundError: HelloWorld/java
Caused by: java.lang.ClassNotFoundException: HelloWorld.java
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)
Could not find the main class: HelloWorld.java. Program will exit.
type HelloWorld.javapublic class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello world!");
echo %PATH%C:\Program Files\PC Connectivity Solution\;C:\WINDOWS\system32;C:\WINDOWS;C:\WIN
DOWS\system32\WBEM;c:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\WINDO
WS\system32\WindowsPowerShell\v1.0;c:\Program Files\Microsoft SQL Server\100\Too
ls\Binn\VSShell\Common7\IDE\;c:\Program Files\Microsoft SQL Server\100\Tools\Bin
n\;c:\Program Files\Microsoft SQL Server\100\DTS\Binn\;c:\Program Files\Microsof
t Visual Studio 9.0\Common7\IDE\PrivateAssemblies\;C:\Sun\SDK\bin;C:\PROGRA~1\MI
CROS~2\Office12
java -versionjava version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Client VM (build 14.3-b01, mixed mode, sharing)
>

java testPassword.javaThe JRE doesn't run source code. You haven't installed a JDK. Forget Eclipse, you need to revisit some fundamentals, my friend.

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/

Could not find the main class : HelloWorldApp program will exit

please help me
i downloaded and installed jdk-6u13-windows-i586-p(1) from sun.java.com
in my computer --> Advanced --> environment variables --> i had set
user variable :
variable value
java_home C:\Program Files\Java\jdk1.6.0_13\bin
System variable:
path : C:\Program Files\Java\jdk1.6.0_13\bin
after that i wrote a program
* The HelloWorldApp class implements an application that
* simply prints "Hello World!" to standard output.
class HelloWorldApp {
public static void main(String[] args) {
System.out.println("Hello World!"); // Display the string.
i saved in c:\ mywork
i compiled it with
javac HelloWorldApp.java and then
java HelloWorldApp
output / result also came
but iam unable to create jar file . when it is created it is showing
could not find the main class : HelloWorldApp program will exit
i created jar file by following way
i created
manifest.txt
Min-Class : HelloWorldApp and then
start -->run--> cmd-->
c:\mywork> jar cfm test.jar manifest.txt HelloWorldApp.class
c:\ java -jar test.jar
but it displays a message
" could not find the main class : HelloWorldApp program will exit "
please please please help me please 1000's of please help me

Peter__Lawrey wrote:
You have to specify the manifest with a special option (I think its was -M)
Otherwise the jar will create one (even if you provide it)No, the text file passed as a parameter will be incorporated in the manifest file generated by the JAR tool.
@OP: This will work:
JarTest.java
public class JarTest {
public static void main(String[] args) {
System.out.println("JarTest works!");
}manifest.txt
Main-Class: JarTest+(note there is an extra new line in the manifest.txt!)+
Now execute these commands:
javac JarTest.java
jar cfm MyJar.jar manifest.txt JarTest.class
java -jar MyJar.jar And on my machine, the string "JarTest works!" is displayed on the screen.
And if you look in the MANIFEST.MF file inside your jar file (you can use almost any zip-utility for this), you will see the following:
Manifest-Version: 1.0
Created-By: 1.6.0_0 (Sun Microsystems Inc.)
Main-Class: JarTestOr something similar.

Could not find the main class - Problem with Webservice-Access

Hello Everybody,
I'm having serious Problems with accessing a WebService (Tomcat-Axis) per executable jar-File.
I constructed a simple GUI with 3 Textboxes 1 Button and 1 Resultbox.
I use eclipse so it was no Problem to simple generate the Backgroundclient by Processing the .wsdl-File of the WS.
Now I do this:
Head_tServiceLocator serviceLocator = new Head_tServiceLocator();
Head_t service = serviceLocator.getRPCCall();
RPCCallSoapBindingStub Head_t = (RPCCallSoapBindingStub) service;and use the Webservice like an Object.
All this works very well.
Now the Problem:
Head_t service = serviceLocator.getRPCCall();this Line has to throw a ServiceException.
If i add a try-catch Block to Process the Message JAVA tells me after i exported to JAR (with Manifest-stuff and so on) and double Click on the JAR the following :
Could not find the main Class - Program will exit.
And if i add a throws Declaration to the Methodheader it tells me:
Fatal Exception Occured - Program will exit
But if i Comment out that Line at least the GUI is being displayed (so it DOES find the main-Class). But then of course the Webservice won't be accessed.
All the JARs needed (axis.jar, commons-discovery.jar and so on) are in the same Directory as the Webservice-Client.jar
Please Help me.
Greets,
Zap

I am not done any typing mistake while creating the jar file i already followed the suggestion that you have mentioned but still the same error .
This is my MANIFEST.MF file created under META-INF folder
Manifest-Version: 1.0
Class-Path: qtjambi-4.4.3_01.jar qtjambi-win32-msvc2005-4.4.3_01.jar
Created-By: 1.5.0 (Sun Microsystems Inc.)
Main-Class: Ui_MainWindow
When i extracted the app.jar following this i got
1. META-INF folder inside that MAINFEST.MF file the contents i have already placed above
2. qtjambi-4.4.3_01.jar
3. qtjambi-win32-msvc2005-4.4.3_01.jar
4. Ui_MainWindow.class
Please tell me whats wrong in that i can also give you the app.jar file please let me know the email id ..

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.
But the curious thing is, that I have tested the little Swing-Application with 3 JRE versions: 1.4.2._06, 1.4.2_09 and 1.5 on Win2K and XP. Every time it works fine, but on one system it fails. (Normally it requires no external classpath settings, no path-entries to work.)
The ugly system is Win XP with JRE 1.4.2_06 installed.
Is there anybody with a good hint?
Please let me know.
Christiane

OK, I ll try to explain it in other words:
It is an executable jar file, with a manifest file that specifies the Main-Class. No other external files or jars or settings needed. Only a simple JDialog initialized from a parent JFrame.
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."
My Problem is, I don t understand the launching process in depth. But I can reproduce the message with the following command:
wrong:
javaw -cp OrderAlertTest.jar OrderAlertParentDialog
-> Error dialog appears
correct:
javaw -cp OrderAlertTest.jar apo.order.OrderAlertParentDialog
-> OK
Any idea?
Christiane

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
Downloaded Eclipse Ganymede.
A new project, a new class with an existing and working java file. It did function in eclipse.
Generated a jar file with:
Export \ JAR FILE \ select files and the destination for the Jar file .....
... next...next filled the field Main Class
This generates the jar files, which have worked before.
And now the error: could not find the main class.
Thand you for your help.

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.
To test, do this: remove everything from the manifest that you don't need, except the Manifest-Version and Main-Class attributes. Make sure the last line is a new line, and see if it works.
Cheers

Installer problems - Could not find the main class

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:
Java Virtual Machine Launcher : Could not find the main class. Program will exit
I have several sun JREs/JDKs installed and have tried all of them, the installer itself is not impacted:
jre 1.7.0
jdk 1.7.0
jre 1.6.0.7
jre 1.6.0.7 and jre 1.6.0.7
Am I missing something obvious or is there a way of installing without the java installer ?
Much obliged
Edited by: Alphawave on Oct 14, 2008 11:39 AM

Hi,
I've seen this error before on vista. In the past the users saw this message when they didn't have write permission on the directory they were installing to. Even with administrator privileges, they still need write permissions.
A quick test is to:
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.
Thanks.

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.

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

I have installed J2SE and followed all the instructions but upon restarting the PC I get a dialogue box with the messege Java Virtual Machine Launcher could not find the main class - program will exit.
I have tried multiple times un-installing and re-intalling this but i still get the messege when i restart windows.
Can anyone offer any suggestions as to what i may be doing wrong.
When I do the verify installation I get the congtratulations you have the latest Java Installed.
Help

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
Apparently, whatever it is, it's not correctly configured.

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

Hey,
I am new to Java. I have started to make a small java program which supposed to help me at my studies to lean the Dominic Memory System. I have used the latest version of Netbeans 5.5.1 to build my program in. I have two problems which I cannot figure out how to solve, please help me.
The first problem is that the java script I have made works when I compile it in Netbeans, but when I create a Jar file it does not work. I receive a pop up message in windows ?could not find the main class program will terminate? when I execute the jar file.
The second problem I have is that I need to compare the strings generated by the "numbers" and "TIP" and if the numbers is not identical the numbers in the ?Center? JPanel should be highlighted as red.
If anyone would like to clean up the code I would be pleased. I have copied quite a lot from anyone because of my one lack of knowledge.
* 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;
import java.awt.event.*;
import javax.swing.*;
import java.util.Vector;
import java.util.StringTokenizer;
import java.awt.Color;
* @author Computer
public class GoListener implements ActionListener {
private JTextField viewer;
private JTextField TIP;
private JTextField freq;
private JTextField max_num;
private Vector numbers;
public GoListener(JTextField j,JTextField k, JTextField m, JTextField f, Vector n) {
freq = f;
max_num = m;
viewer = j;
numbers = n;
TIP = k;
public void actionPerformed(ActionEvent e){
int time = Integer.valueOf(max_num.getText());
int f = Integer.valueOf(freq.getText());
if (e.getActionCommand() == "GO") {
for (int i = 0; i< time;++i) {
int number=0;
number = (int)Math.floor(100*Math.random());
while(number>51){
number = (int)Math.floor(100*Math.random());
if(number<=9){
viewer.setText(" "+"0" + String.valueOf(number) + " ");
} else{
viewer.setText(" " + String.valueOf(number) + " ");
viewer.paintImmediately(viewer.getBounds());
numbers.add(number);
try {
Thread.sleep(f*1000);
} catch (Exception exp) {
viewer.setText(" XX ");
viewer.paintImmediately(viewer.getBounds());
if (e.getActionCommand() == "VIEW") {
try {
//int numb = Integer.valueOf( TIP.getText() ).intValue();
StringTokenizer tokenizer = new StringTokenizer(TIP.getText(), " ");
String[] split = null;
int tokenCount = tokenizer.countTokens();
if (tokenCount > 0) {
split = new String[tokenCount];
for (int current = 0; current < tokenCount; current++) {
split[current] = tokenizer.nextToken();
viewer.setText(" " + String.valueOf(numbers) + " ");
// k=numbers(1);
/*while(c<i){
String.valueOf(k).equals(split[1]);
c++;
TIP.setText(" " + split[2] + " ");
} catch (Exception exp) {
try {
//string testit = numb.toString();
//String str = "" + numb;
//viewer.setText(str);
//viewer.setText(numbers.toString());
numbers.clear();
} catch (Exception exp) {
* Main.java
* Created on 12. september 2007, 21:07
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
package grandmaster;
import java.util.Vector;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.JButton;
import java.awt.*;
import grandmaster.GoListener;
* @author Computer
public class Main extends JFrame {
private JTextField viewer;
public JTextField TIP;
// private TextInputPanel TIP;
private Vector numbers;
/** Creates a new instance of Main */
public Main() {
numbers = new Vector();
JPanel p = new JPanel(new GridLayout(0,4));
JButton go = new JButton();
JButton view_num = new JButton();
go.setText("Go!");
go.setVisible(true);
go.setActionCommand("GO");
view_num.setText("VIEW");
view_num.setVisible(true);
view_num.setActionCommand("VIEW");
JTextField max_num = new JTextField();
max_num.setText("5");
JTextField freq = new JTextField();
freq.setText("1");
viewer = new JTextField();
viewer.setText("XX");
TIP = new JTextField("");
p.add(go);
p.add(max_num);
p.add(freq);
p.add(view_num);
getContentPane().add(p,BorderLayout.NORTH);
getContentPane().add(viewer,BorderLayout.CENTER);
getContentPane().add(TIP,BorderLayout.SOUTH);
setSize(200,200);
GoListener g = new GoListener(viewer,TIP,max_num, freq, numbers);
go.addActionListener(g);
view_num.addActionListener(g);
* @param args the command line arguments
public static void main(String[] args) {
// TODO code application logic here
Main window = new Main();
window.setVisible(true);
}

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.

Installing Oracle client 10.2: Could not find the main class...

Similar Messages

Maybe you are looking for