Stian_B
asked on
Jar file gives error message "Could not find the main class. Program will exit" on first try, works on second run
Hi all,
I've created a java application that should be deployed. However, on every deployment, when i first run the jar file, i get this error:
"Could not find the main class. Program will exit".
When i run the file again, it works, and it works every time after that..
I'm using netbeans, and the Main Class under project properties are set to "project".Main, which is the correct class. Does anyone have a suggestion?
stian
I've created a java application that should be deployed. However, on every deployment, when i first run the jar file, i get this error:
"Could not find the main class. Program will exit".
When i run the file again, it works, and it works every time after that..
I'm using netbeans, and the Main Class under project properties are set to "project".Main, which is the correct class. Does anyone have a suggestion?
stian
Last Comment
CEHJ
Make sure your manfest was written correctly in the jar
ASKER
here is the content of manifest.mf
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.1
Created-By: 14.0-b16 (Sun Microsystems Inc.)
Main-Class: kassesystem.Main
Class-Path: lib/mysql-connector-java-5
b/jsch-0.1.42.jar
X-COMMENT: Main-Class will be added automatically by build
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.1
Created-By: 14.0-b16 (Sun Microsystems Inc.)
Main-Class: kassesystem.Main
Class-Path: lib/mysql-connector-java-5
b/jsch-0.1.42.jar
X-COMMENT: Main-Class will be added automatically by build
Do you have the main-class attribute in the manifest file?
Also, have a look this link - http://forums.sun.com/thread.jspa?threadID=557868
Also, have a look this link - http://forums.sun.com/thread.jspa?threadID=557868
ASKER
The Main-Class looks right, and the strange thing is that the jar runs correctly on the second try, but fails every time on the first try..
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Might be an eclipse issue as well. Are you running with the build automatically option checked?
ASKER
CEHJ:
I'm not familiar with ant, how would i implement it? I'm kinda new to java, i've just learned it as problems came along with this project.
a_b:
i'm using netbeans.
I'm not familiar with ant, how would i implement it? I'm kinda new to java, i've just learned it as problems came along with this project.
a_b:
i'm using netbeans.
ASKER
i discoverd a strange thing.
When unpacking the jar file "kassesystem.jar", the classes are located in the unpacked folder kassesystem.
It seems to be many copies of every class. For example the main class has 5 classes:
Main$1.class 2 KB
Main$2.class 2 KB
Main$3.class 2KB
Main$4.class 2KB
Main.class 30 KB
When unpacking the jar file "kassesystem.jar", the classes are located in the unpacked folder kassesystem.
It seems to be many copies of every class. For example the main class has 5 classes:
Main$1.class 2 KB
Main$2.class 2 KB
Main$3.class 2KB
Main$4.class 2KB
Main.class 30 KB
ASKER
"That suggests you have a task that depends on another one".
You're propably right, i'll install the program again and read the stack trace..
You're propably right, i'll install the program again and read the stack trace..
Ant is used by Netbeans to implement its builds. If you're trying to run the thing through clicking then you need to make sure the main class is set for the project
>>It seems to be many copies of every class
Those are not copies, but inner classes
>>It seems to be many copies of every class
Those are not copies, but inner classes
ASKER
ah yes, you were right CEHJ, it was a dependency, when running the jar file i start mysqld, and then create tables the first time it's run, however, the service is not up and running yet, so there's the problem. Thanks
ASKER
Thanks CEHJ, again:)
:-)
OK. Get to know ant by putting its bin directory on your PATH
OK. Get to know ant by putting its bin directory on your PATH
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