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Editorial Team
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Asked: 2026-06-03T03:20:30+00:00

This is my first question, so apologies for any mistakes. I’ll try and give

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This is my first question, so apologies for any mistakes. I’ll try and give all the info I can. Basically I’ve written a simple swing application which just loads in image into a JPanel and displays it. I’m using Netbeans 7.1 and I have the latest version of the Java SDK.
Anyway, I’ve used the “Build” feature in NetBeans 7.1 to deploy my application into a Jar file. When I double click the Jar File on my PC, it runs without a problem. However when I put it on other computers (Tested on 2 others so far, both with the most current JRE) it fails to open, citing the following error:

could not find the main class: swong.Startup. Program will exit

swong is my package name, and Startup is the location of my main method. I have checked the manifest file which is created with Netbeans’ build, and it[the manifest] does indeed contain the location of my main method class.

From searching, I’ve come across similar issues in which the classpath is set wrongly, but I don’t understand how this could cause my particular error.

If someone could help me, I would be over the moon. I’ve been studying java for a year or so, and I’ve got a good handle down, but I’ve NEVER been able to make a Jar that runs on a computer which wasn’t my own. So, 10 points and thanks in advance.

xo.

EDIT: Thank you for the responses. I’m doing shift work and swamped, but I will test and poke with these responses tomorrow and provide more information. Thanks again. xo

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1 Answer

  1. Editorial Team

    I had d same problem while distributing my app. There is 1 solution that you create a batch file with ‘java -jar AppName.jar’ and asking user to double click on this batch file to execute your app. What i did was to provide a JRE installation exe(eg: jre_1.7.0) with your app.
    Now create a Batch file (install.bat) in which write following commands

    jre_1.7.0 -> this will install jre on user’s pc

    set path=”C\Program Files\Java\jre_1.7.0\bin”

    java -jar yourAppName.jar

    Why i installed JRE because different people have different JRE versions installed. So this makes it difficult to set path to the installed JRE’s bin folder & calling the ‘java -jar’ command. Hence as you know which folders your JRE installation will create hence it is easy to set path and execute your jar file with ‘java-jar’ command.

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