Could Not Find Main Class (again)

[illjavathat]

i did some searching around this site and on google and such and after about a month i have decided to make an account for the sole purpose of asking this question.
To be clear: I DO NOT SPEAK JAVA
The Problem: After recently updating Java to the latest version (20) I now get the following error running any .jar file. "Could Not Find The Main Class: *****/**/***.jar Program Will Exit." ** are examples.
What I have tried reinstalling java.
clearing out old versions.

What i have found and am confused with, something in the cmd with java -cp -jar ***.jar
I would like to be helped over teamviewer if at all possible. You can either leave a reply here or if it is close to the time i have posted please feel free to join me in my irc here. Rizon Web IRC (qwebirc) i am nick1 just name yourself javaforum so i know your there to help me, thanks so much in advance.

[dinosoep]

do you get this with every jar?
its normal you get it with ones that don't have their manifest files set...
download beanshell and start it up, does that works?

[Webuser]

look the manifest.MF file and tell us does it contain a main class ref...

[illjavathat]

do you get this with every jar?
its normal you get it with ones that don't have their manifest files set...
download beanshell and start it up, does that works?

"I now get the following error running any .jar file"
and for beanshell...? i downloaded first file from this page...
BeanShell - Downloads
and yes i got could not find main class.

look the manifest.MF file and tell us does it contain a main class ref...

edit 1: here i searched for a manifest.mf file and upon running found it was deleted... http://dl.dropbox.com/u/120327/javaerror1.jpg
i should have mentioned that i do not speak java lol, as i said this is for ANY jar file but the one i am trying to use right now contains a manifest.txt file listed as this.

Main-Class: org.rsbot.Boot

Name: org/rsbot
Sealed: true
Specification-Title: "RSBot"
Specification-Vendor:  "org.rsbot"
Implementation-Title: "RSBot"
Implementation-Vendor: "org.rsbot"

EDIT 2: in C:\Program Files\Java\jre6\lib\ext i had qtjava.ZIP ...? i unzipped and now have the correct files but still the wrong errors now i think changing my environment variables will do something...?
Edit3: was i supposed to unzip that?

[Norm]

Can you copy and paste here the FULL contents of the console when you try to execute the java program - show command and response.

[illjavathat]

Can you copy and paste here the FULL contents of the console when you try to execute the java program - show command and response.

I thought i was pretty clear in my first message, however here is a screenshot of the error I get when running rsbot.jar (example 1) and IcePushClient.jar (example 2)
Previously Posted Exmaple: http://dl.dropbox.com/u/120327/javaerror1.jpg
Example 1: http://dl.dropbox.com/u/120327/javaerror2.jpg
Example 2:http://dl.dropbox.com/u/120327/javaerror3.jpg

Thanks...

[Norm]

Sorry, the output from your java program launcher doesn't mean anything to me.
Can you open a command prompt window and run it from there and copy the contents of the screen. I need to see the command that was issued and the FULL text of the error message that comes from the java command.

[illjavathat]

Sorry, the output from your java program launcher doesn't mean anything to me.
Can you open a command prompt window and run it from there and copy the contents of the screen. I need to see the command that was issued and the FULL text of the error message that comes from the java command.

Rizon Web IRC (qwebirc) anyway you can join me there (if your still on and i can talk live/ teamviewer?) thanks so much.
i am not sure what command is used to run this i am simply opening ANY .jar file...?

[Norm]

i am simply opening ANY .jar file

Open a command prompt, move to the folder with the jar file and enter:
java -jar yourjarfilenamehere.jar

[illjavathat]

Open a command prompt, move to the folder with the jar file and enter:
java -jar yourjarfilenamehere.jar

well this is the wierd part because from the cmd it works (no error, no response), i knew about this but i am really looking for a fix rather than this workaround. i dont understand why the cmd method is any different than running it normally.
i can give you an example of a specific jarfile and the .bat file typically used to start it.
Play.bat

@ECHO OFF

SET cc=javac
SET cflags=
SET src=src
SET lib=lib
SET res=resources
SET out=bin
SET jarout=data

CALL Clean.bat 2>NUL
CALL "%res%\FindJDK.bat"

SET lstf=temp.txt
SET imgdir=%res%\images
SET manifest=%res%\Manifest.txt
SET versionfile=.version
FOR /F %%G IN (%versionfile%) DO SET version=%%G
SET scripts=scripts
SET dist=RSBot.jar
SET full=1

IF "%1"=="/S" (
	SET full=0
	GOTO :scripts
)

ECHO Compiling bot
IF EXIST "%lstf%" DEL /F /Q "%lstf%"
FOR /F "usebackq tokens=*" %%G IN (`DIR /B /S "%src%\*.java"`) DO CALL :append "%%G"
IF EXIST "%out%" RMDIR /S /Q "%out%" > NUL
MKDIR "%out%"
"%cc%" %cflags% -d "%out%" "@%lstf%" 2>NUL
DEL /F /Q "%lstf%"

:scripts
ECHO Compiling scripts
ECHO. > "%scripts%\.class"
DEL /F /Q "%scripts%\*.class" > NUL
"%cc%" %cflags% -cp "%out%" %scripts%\*.java
IF "%full%"=="0" GOTO :end

ECHO Packing JAR

IF EXIST "%dist%" DEL /F /Q "%dist%"
IF EXIST "%lstf%" DEL /F /Q "%lstf%"
COPY "%manifest%" "%lstf%"
ECHO Specification-Version: "%version%" >> "%lstf%"
ECHO Implementation-Version: "%version%" >> "%lstf%"
IF NOT EXIST "%jarout%" MKDIR "%jarout%"
jar cfm "%jarout%\%dist%" "%lstf%" -C "%out%" . %scripts%\*.class %res%\version.dat %imgdir%\*.png %res%\*.bat %res%\*.sh
DEL /F /Q "%lstf%"

:end
ECHO Compilation successful.
GOTO :eof

:append
SET gx=%1
SET gx=%gx:\=\\%
ECHO %gx% >> %lstf%
GOTO :eof

now running this batch file i would get the main class error, HOWEVER if i make a new batch file simply saying

start play.bat

then it works... it is a hassle to do this for each jarfile and i am confused about why its happening. thanks for all the help so far and to come in advance.

PS if the play.bat code was unneeded then so be it, like i said i dont understand much.

[Norm]

i am really looking for a fix rather than this workaround.

running it normally

I run java programs all the time by having shortcuts that execute the command: java -jar filename.jar
So I consider that the normal way to execute a jar file.
When java is installed on Windows the install process puts an entry in the registry that uses the java -jar %1 command. Then when you double click on a jar file that command is executed.

I'm very confused on what your problem is?

I do not see anywhere in the batch file you posted that it executes a jar file. The batch file creates a jar file using the jar command:
jar cfm "%jarout%\%dist%" ....

Please explain your problem and document it with a screen print if you can.

What program were you running for the screen prints you posted earlier?

[illjavathat]

so i need to edit my registry values...? was it replaced right now? can someone fix this for me over teamviewer or if someone is on atm please join the chat link is in first post.

[Tolls]

So are you getting this because you are running thsat BAT file?

If that's the case, does it work when you simply double click on the jar file?
If that works, and the command line one works (as you say above), then java is working...and it is simply down to whatever that BAT file is doing.

[Norm]

You shouldn't have to edit the Registry. The install process makes entries there.
What is displayed in the Type column in Windows Explorer for jar files?
On my system its: Executable Jar File.
If java wasn't installed it would say: Jar File

does it work when you simply double click on the jar file?

[illjavathat]

What is displayed in the Type column in Windows Explorer for jar files?

Jar File... hmm how to fix...?
and no as i said in my first and many other posts lol that is the problem, by running (clicking/opening) the jar file it gives the main class error.

[Norm]

If the column says Jar File that is the default type that Windows gives to files that it doesn't know what to do with. When java is installed it changes the type name for jar files to be Executable Jar File.

it gives the main class error.

Where did you post the Full contents of this error message? I can't see it. See my post#9

It could be that you need to reinstall java. That will associate the jar file with the "java -jar %1" command and change the type to "Executable Jar File".

[illjavathat]

i have tried reinstalling java. http://dl.dropbox.com/u/120327/javaerror2.jpg is the full error.

[Norm]

Please read post#9. I have no idea what the screen print you posted is.

What program displays the "Java Virtual Machine Launcher" window? I've never seen it.

One more idea. Do the following to get command line executed when a jar file is doubleClicked:

Open Windows Explorer
Click on Tools menu
Click on Folder Options
Select File Types tab
Scroll down in the "Registered file types:" list until you see an entry for JAR.
Select the JAR entry.
Click the Advanced button
In the Edit File Type window scroll down the list of Actions until you see the one in bold.
Select the bold one
Click the Edit button
Select, Copy and paste here what is in the "Application used to perform action:" window.

Be careful not to change anything and Cancel your way out of the open windows.

[illjavathat]

Please read post#9. I have no idea what the screen print you posted is.

What program displays the "Java Virtual Machine Launcher" window? I've never seen it.

One more idea. Do the following to get command line executed when a jar file is doubleClicked:

the window is from javaw.exe which is what im trying to run the jarfile from.
i could not find device types for changing to a cmd line... even after etensive googling lol.
btw i had some problems but eventually redownloaded AGAIN java and jdk.

[Norm]

i could not find device types for changing to a cmd line.

No idea what this means. Can you explain?

What is the date on the javaw.exe file you are executing?

Did you try the steps I listed for getting the commandline from Windows Explorer?


Do a google on Java Virtual Machine Launcher
There are several forums where problems with that has been discussed