Could not find main class [modified]

RossouwDB

Good day, I have been battling with this for a while now, and have been at previous forums regarding this problem, all leading to non-working solutions. Note: I am using NetBeans IDE 7.0 and java 1.6.0_25 on a Windows XP SP 3 machine. I want to run the application without using the command line, although using the commandline gives me exactly the same error. I have tried numerous other forums, even consulting the java forums, but all to no avail. Most of the forums make mention about editing the build file, but not being a java guru (c# is more my thing), I have no idea what to do! (I am including my build.xml as well as the manifest.mf file which is contained within the .jar file for anybody who wants to have a peek at it.) When I run the application from within NetBeans, everything works fine. I thought that maybe something went wrong with my java installation, but (fortunately?) I had a BSOD, so I was forced to format my system, which then received a very fresh installation of NetBeans as well as java, but the error still remains. If you could help me, it would be much appreciated! Just ask if you need additional files or information, Kind regards, Rossouw EDIT: When I run the application from within NetBeans, it informs me that it cannot find some of my packages, but when I first build and clean it, and then run it, it runs fine. build.xml

<?xml version="1.0" encoding="UTF-8"?>








<project name="OmniIDE" default="default" basedir=".">
<description>Builds, tests, and runs the project OmniIDE.</description>
<import file="nbproject/build-impl.xml"/>
<!--

There exist several targets which are by default empty and which can be 
used for execution of your tasks. These targets are usually executed 
before and after some main targets. They are: 

  -pre-init:                 called befo

Gerben Jongerius

You should not have to edit the build.xml for your java app to work from the console. Since it is working from Netbeans I'm presuming that all your code is correct and compiled properly without problems. Netbeans will create a .jar file in the build directory of the project. You will have to find that to be able to start your main class via command line. Once you located it you can start the your jar from the command line as follows:

java -cp myjar.jar;mylib1.jar;mylib2.jar com.classpackage.MyClass

Where you need to replace the last parameter with the full class name of the class you are trying to start (so including the full package name). The files after -cp are the libraries you need for your application to run. This would at least include the jar file generated by Netbeans, but also any library that you have included in the project.

TorstenH

It could even be simpler. I'm using Eclipse, but also Netbeans should have some "Extract Project" option. There you can select on the type of application you need - Netbeans should do the rest of the job. The extracted stuff should inculde a starter in form of *.exe .

regards Torsten I never finish anyth...

RossouwDB

Gerben Jongerius wrote:

java -cp myjar.jar;mylib1.jar;mylib2.jar com.classpackage.MyClass

Unfortunately this did not work. Here is my directory structure: -dist --OmniIDE.jar --lib ---AbsoluteLayout ---appframework-1.0.3.jar ---beansbinding-1.2.1.jar ---swing-layout-1.0.4.jar ---swing-worker-1.1.jar So I CMDd the following:

java -cp OmniIDE.jar;lib\AbsoluteLayout.jar;lib\appframework-1.0.3.jar;lib\beansbinding-1.2.1.jar;lib\swing-layout-1.0.4.jar;lib\swing-worker-1.1.jar com.omniide.OmniIDEApp

And the exception (all continuous):

Exception in thread "main" java.lang.NoClassDefFoundError: com/omniide/OmniIDEApp

TorstenH. wrote:

Netbeans should have some "Extract Project" option.

Unfortunately, no. There are two extract options: -Extract Interface -Extract Superclass Converting from NetBeans to Eclipse would not be an option though... Thanks, Rossouw

Lost User

Where is the class file com/omniide/OmniIDEApp within the items listed in your classpath, and are you sure the spelling is correct?

The best things in life are not things.

RossouwDB

I'm not sure I am following... (Java isn't my strongpoint.) I don't set any environment variables myself, and I don't set any classpath myself either. I figured that the jar file (with the manifest and build file), would handle that for me.

Lost User

RossouwDB wrote:

I don't set any classpath myself

The -cp option followed by a list of .jar files is your classpath. You need to check that the class you are trying to invoke actually exists within one of your .jar files and is under the specified path (i.e. package and class).

The best things in life are not things.

RossouwDB

Richard MacCutchan wrote:

-cp option followed by a list of .jar files is your classpath

crud, I knew but forgot that! Now I follow :-O The omniide is my "main" package, and the omniIDEApp is the entrypoint of my application. Everything is spelled correctly since I have even copied it as is from my Manifest file, but to no avail. Here is the actual code for my entrypoint class:

/*
* OmniIDEApp.java
*/

package omniide;

import org.jdesktop.application.Application;
import org.jdesktop.application.SingleFrameApplication;

/**
* The main class of the application.
*/
public class OmniIDEApp extends SingleFrameApplication {

/\*\*
 \* At startup create and show the main frame of the application.
 \*/
@Override protected void startup() {
    show(new OmniIDEView(this));
}

/\*\*
 \* This method is to initialize the specified window by injecting resources.
 \* Windows shown in our application come fully initialized from the GUI
 \* builder, so this additional configuration is not needed.
 \*/
@Override protected void configureWindow(java.awt.Window root) {
}

/\*\*
 \* A convenient static getter for the application instance.
 \* @return the instance of OmniIDEApp
 \*/
public static OmniIDEApp getApplication() {
    return Application.getInstance(OmniIDEApp.class);
}

/\*\*
 \* Main method launching the application.
 \*/
public static void main(String\[\] args) {
    launch(OmniIDEApp.class, args);
}

}

This code is generated by NetBeans when the project is created. I am stumped as to the cause of this error! :wtf:

Lost User

Are you sure about the com. prefix in your class name:

java -cp OmniIDE.jar;lib\AbsoluteLayout.jar;lib\appframework-1.0.3.jar;lib\beansbinding-1.2.1.jar;lib\swing-layout-1.0.4.jar;lib\swing-worker-1.1.jar com.omniide.OmniIDEApp

[edit]You can check this by running the command jar -tvf against the jar file that contains (or should contain) your main class.[/edit] [edit2]Or you could execute the .jar file directly by

java -cp lib\AbsoluteLayout.jar;lib\appframework-1.0.3.jar;lib\beansbinding-1.2.1.jar;lib\swing-layout-1.0.4.jar;lib\swing-worker-1.1.jar -jar OmniIDE.jar

assuming your main class is in the OmniIDE.jar file. [/edit2]

The best things in life are not things.

RossouwDB

I have tried omitting it, but still doesn't work.

Lost User

See my edits to my previous message.

The best things in life are not things.

RossouwDB

Richard MacCutchan wrote:

running the command jar -tvf against the jar file that contains (or should contain) your main class

Confirms that com. is not needed, and that my main class is contained within the OmniIDE.jar file.

Richard MacCutchan wrote:

Or you could execute the .jar file directly

Does not work.

Lost User

RossouwDB wrote:

Does not work.

Really not a helpful definition of a problem! What's the output of the jar -tvf command? Also what happens when you try with the -jar option? Please show exact commands and exact output in all cases. PS: I do not use NetBeans but Eclipse, and I know there are some bits of framework stuff that NetBeans adds to your package so it may well be that you cannot run the final package outside of the NetBeans environment. However, why that would be so is anyone's guess.

The best things in life are not things.

RossouwDB

I don't know how and why, but now everything is working!! I was typing away, and doing a clean + build like I normally do,and when I tried to run it again, it bombarded me with error messages indicating that a lot of my packages could not be found! Stumped, I cleaned and built it a couple of times, but failed miserably when I want to run it (really odd, since it was running successfully a couple of seconds ago.) So, I located the "broken" package, and renamed it to the package NetBeans expected. Cleaned and built it, ran it - it worked. So i though I might give executing the application a shot, and it worked! It's really odd though, since NetBeans should have complained right from the start, but for some reason, it didn't.:confused: Anyway, thanks for your help.

TorstenH

Stop. that. NOW! This is no simple Java homework that's not running. Packaging and Deploying Desktop Java Applications with Netbeans[^] Check that, READ IT and follow the instructions instead of burning money online.

regards Torsten I never finish anyth...

Lost User

Sorry, what?

The best things in life are not things.

RossouwDB

Wait, what???? Dude, you ok? Did I say this is homework?????

TorstenH

This is no simple Java homework Netbeans should provide a functionality to export your project in a proper way. There is no need to build some strange stuff. That's time waisted.

regards Torsten I never finish anyth...

RossouwDB

TorstenH. wrote:

This is no simple Java homework

It's NOT HOMEWORK. It's a project I am working on...

TorstenH. wrote:

Netbeans should provide a functionality to export your project in a proper way.

Clearly it's not always working so well, but I would still use NetBeans.

TorstenH. wrote:

There is no need to build some strange stuff

Why not??? What isn't strange in live? Clearly you are.... So am I!

TorstenH. wrote:

That's time waisted

No, actually it's not! I have learned something from this entire experience, so I would not say it's time wasted! **Note:**If you don't want to help people, and you want to attack them for some strange and peculiar reason, rather keep quiet! (Go read the guidelines: Insults, slap-downs and sarcasm aren't welcome. Let's work to help developers!)

TorstenH

..That's what I said - this does not look like a simple homework-project that can be simply launched from the command line. Why would you even want to work on the command line? All you're asking for is to run it outside of your IDE. So I recommend to export the project in the given way and that's it. Netbeans will do what is is supposed to do - build your application. No need to waste hours of time on fuzzy command line arguments. Better get a nice ice cream and watch Netbeans do the build :cool:

regards Torsten I never finish anyth...