How to create runnable JAR in Eclipse

I have a project in Eclipse with many classes.
Whenever I try to create a runnable JAR, the JAR file created always contains all the classes of the project, regardless whether they are really used or not.
Is it possible to create a runnable JAR in Eclipse, excluding the classes of the project which are not strictly necessary for a given launch configuration?

krige wrote:
I have a project in Eclipse with many classes.My condolences on using a build system that apparently has grabbed you by the short & curlies. That can be painful.
Note that:
1) Eclipse can use Ant style build.xml files for controlling most aspects of a build (that are worth mentioning).
2) We provide no support for Eclipse on these groups, but since Ant typically defers to a core set of tools in the SDK, you can usually get away with asking an Ant related question.

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How to create executable jar in eclipse using linking in compiler

Hi,
I have a project in Eclipse. I wrote already an ant build file for creating an executable jar which includes all project files.
Now I want to create a second executable jar which is a subset of the project (a limited number of classes are necessary).
I have a main class and I was looking for a way to generate a jar file which includes the main class and all the depending classes.
Is there a way to do it? With ant or with another tool?
Is it possible to compile a project given a main class, and include all depending classes?
Regards,
Biebel
Edited by: biebel1975 on Jan 7, 2009 10:21 AM

biebel1975 wrote:
Some more information:
When I compile all the classes, the jar file is +/- 3.5Mb inclusive the server side logic.
The subproject I want to build, should be less then 1Mb (Only some screens and beans, no business logic ((only +/- 10% of the projects code) )).
My question is: How can I create a executable jar with only the necessary class files which depends on the main class. (Linked with the imports).
Is there a tool to do that? Can it be done with an ANT script? If so, how does the script looks?
What are you talking about?
You already said that you are using Ant.
Ant uses script files.
Since you have one with X items in it and you want something new with X-Y items in it the obviously it would make sense to construct an ant script that does less than the other ant script.
The following provides a huge amount of information about Ant.
[http://ant.apache.org/resources.html]
Other than that no one can tell you want your Ant script will look like except that it will do less than the one that you already have.

Runnable JAR in Eclipse

Hi,
I'm trying to make a runnable JAR in Eclipse, but I don't know how to limit which libraries or other source codes to be included inside. Does anyone know how to do this? The JAR I'm making is 13.6 MB, much bigger than I think it should be.
Thanks.

You can create a runnable jar file only when u have a public class with main method as a entry point of java Application.Always create runnable jar file when u r using GUI in ur java application.
Steps which r required in Eclipse for creating runnable jar file as herein after provided
1-Right click on your project and select export option.A export window will get pop-up.
2-Select jar file option from the poped-up window which will be in java option of window.
3-After Clicking JarFile option a new window will get pop-up.
4-Select the export destination for ur jar file and click next.
5-After clicking the next a new screen you will see, click on next button again.
6-Now u will see a new screen which has a field name as "Main Class" browse for your main class of appliaction.main class is once which has main method.
7-Now select finish.
U hav done..
now double click on your created jar n u will see the output.....
if u hav any other problem...than let me know
Regards,
Ashvani Kumar

Runnable JAR from Eclipse with DLL

Hi,
Is it possible to export a runnable jar from Eclipse that includes and uses a dll?
My simple application uses an 'external' API - JIntelliType - a jar file and a dll belongs to it.
I can run the project fine from Eclipse, but I can't export it to runnable jar. I am a bit lost among classpath, path, build path, native library location, referenced library,..
But maybe it doesn't matter because after trying to look this question up on the net, I am not sure if it is possible to do it with Eclipse (not without additional plugin at least).
Could somebody please help me with this?
Thank you in advance!
lemonboston

Your question is that of deployment. In Eclipse you setup your development environment to include native binaries in the projects working directory. As soon as you leave Eclipse you do not have its facilities anymore and you need to make do with what the JDK has to offer you.So your real question is: I have a jar and a DLL, the jar depends on the DLL. How do I run the application such that the DLL can be loaded by it?
The answer is: you can provide through a system property (java.library.path) which directory Java (and ultimately the operating system) should scan for native binaries, or you can simply put the DLL in the same directory as the jar. The current working directory (the directory where Java is invoked) is always on the binary search pat of the operating system.
The documentation for the java tool is here:
http://download.oracle.com/javase/6/docs/technotes/tools/windows/java.html
To pass a system property as a parameter you would do something like:
java -Djava.library.path=path/to/libs -jar yourjar.jar

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$JDK_HOME/bin/jar (%JDK_HOME%\bin\jar) shows you the syntax
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hari wrote:
hello friends,
hi friends, im working on weblogic commerce server3.1 . i dont know how to create a .jar file in weblogic commerce server3.1. can any one knows send email to me.
thanks.
hari

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how to create executable jar files??
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Hi
I'm very new to Java. I have a private project to do a little admin application for bulk changes to my itunes library via their COM API. Previously I used several javascripts to do this so I don't expect a lot of work to adapt them to Java. I use eclipse and have downloaded com4j (https://com4j.dev.java.net/servlets/ProjectDocumentList) to create wrappers to the COM-objects in iTunes. the quick intro to com4j say that the wrappers are created by the tlbimp.jar. I know that JAR is a a java archive created by jdk using jar.exe but I can't get out a tlbimp.jar file how much i try. If I do something like this
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Edited by: 802710 on 2010-okt-15 03:16

802710 wrote:
Hi
I'm very new to Java. I have a private project to do a little admin application for bulk changes to my itunes library via their COM API. Previously I used several javascripts to do this so I don't expect a lot of work to adapt them to Java. I use eclipse and have downloaded com4j (https://com4j.dev.java.net/servlets/ProjectDocumentList) to create wrappers to the COM-objects in iTunes. the quick intro to com4j say that the wrappers are created by the tlbimp.jar. I know that JAR is a a java archive created by jdk using jar.exe but I can't get out a tlbimp.jar file how much i try. If I do something like this
jar -cvf tlbimp.jar *
Does that make sense? What prerequisites are important? Does jar.exe have to be in som path variable in windows? Should I be in the folder where the classes are or one level up? Anything elseIt sounds to me like the documentation is saying that Java classes in the tlbimp.jar are used to create the wrappers - you do not need to create that jar. I bet if you look at the zip file you downloaded, you will find tlbimp.jar inside the zip file. You need to extract that jar and any other jars inside the zip file and configure Eclipse to use them.

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Hello.
I created a jar file like that:
jar -cvf0 WarShell.jar WarShell.class
I want to use WarShell.class in Eclipse but it not in
my classpath,so I choose [Project] -> [Properties]
-> Java Build Path -> Libraries -> Add External JARs
and add WarShell.jar to the list.
But when I run the program I got a
Exception:NoClassDefFoundError.
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It doesn't work.Says "No such class or directory"
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How to create runnable JAR in Eclipse

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