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How to set classpath in manifest file , while creating JAR from eclipse?


How to set classpath in manifest file , while creating JAR from eclipse?

By : user3865118
Date : January 10 2021, 01:49 PM
this one helps. If you are using eclipse >=3.4 try "export as runnable jar file" it should generate it correctly.
Otherwhise you can provide your own manifest file in the export as jar dialog.
code :


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Building ClassPath variable in Manifest file with Eclipse

Building ClassPath variable in Manifest file with Eclipse


By : Alemar Tanduyan
Date : March 29 2020, 07:55 AM
Any of those help Yes, there is:
Eclipse > File > Export > Java > Runnable JAR File > "Copy required libraries into a sub-folder next to the generated JAR".
CLASSPATH and Manifest file

CLASSPATH and Manifest file


By : Rosestock
Date : March 29 2020, 07:55 AM
it helps some times Normally you generate manifest files by using build tools like Maven or Gradle.
If you want to do it manually you have to use following form:
code :
Class-Path: jar1-name jar2-name directory-name/jar3-name
Add Classpath in Manifest file of jar in gradle

Add Classpath in Manifest file of jar in gradle


By : user3600370
Date : March 29 2020, 07:55 AM
may help you . You should probably put the manifest configuration in jar block itself rather than in doFirst:
code :
jar {
   manifest {
      attributes(
         "Manifest-Version": "1.0",
         "Class-Path": configurations.compile.collect { it.getName() }.join(' ')
      )
   }
}
JRE not using classpath specified by manifest file of runnable jar

JRE not using classpath specified by manifest file of runnable jar


By : Senthil Murugan
Date : March 29 2020, 07:55 AM
With these it helps What you are doing sounds correct.
For some reason the Class-Path entry in the manifest does not show up when inspecting the classpath (e.g. here and here; those examples use the property "java.class.path" but my testing shows that ClassLoader.getURLs() behaves the same). It should still get searched for classes though. I don't know how to obtain the true classpath that includes the Class-Path entry from the manifest.
code :
package jar_1;

public class ClassInJar1 {
    public static void method() {
        System.out.println("Hello from ClassInJar1");
    }
}
package exe;

import java.net.*;
import jar_1.ClassInJar1;

public class myMain {
    public static void main(String[] args) {
        ClassLoader cl = ClassLoader.getSystemClassLoader();
        URL[] urls = ((URLClassLoader) cl).getURLs();
        for (URL url : urls) {
            System.out.println(url.getFile());
        }
        ClassInJar1.method();
    }
}
    Main-Class: exe.myMain
    Class-Path: lib/jar_1.jar lib/jar_2.jar
    Manifest-Version: 1.0
/.../experiment/myJar.jar
Hello from ClassInJar1
Automatically Creating Manifest File with Eclipse for JAR Files

Automatically Creating Manifest File with Eclipse for JAR Files


By : user3801546
Date : March 29 2020, 07:55 AM
help you fix your problem Eclipse provides options to generate a manifest file for the Jar, save that generated manifest into the project, or use a specified file for the manifest.
I have Eclipse 3.4.2 and it's on the fourth screen in this process:
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