created jar file throws NoClassDefFoundError while executing it

Question

My project looks something like this

maven-simple

    src/main/java         
    src/main/resources
    src/test/java
        -com.org.central
          -CommonMethods.java
    src/test/resources

    pom.xml

I am trying to create a jar file through this method in eclipse for the above project

Right Click -> Export -> Java -> Jar File
click Next -> Next -> Finish

exported jar file has been created in the path . Then i am importing this jar file in some other project(for ex:- project b) to use the CommonMethods.java

But i am getting this error

 ←[31mjava.lang.NoClassDefFoundError: com/org/central/CommonMethods
 at stepDefinitions.Check.iSeeElement(Check.java:14)    
 Caused by: java.lang.ClassNotFoundException:  com.org.central.CommonMethods
 at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
 at stepDefinitions.Check.iSeeElement(Check.java:14)

what have i done wrong ?

You should really take a look to Maven documentations : http://stackoverflow.com/documentation/maven/topics & http://maven.apache.org/index.html — Mickael, Sep 06 '16 at 12:38
You need to include your dependencies in your classpath. Make a jar with dependencies (linked question) or use a custom classpath. — Tunaki, Sep 06 '16 at 13:17

score 0 · Answer 1 · answered Sep 06 '16 at 12:32

0

Your jar must contain .class files, not only .java files.

Run a mvn clean install, and you'll get your jar containing the classes.

BTW, always (A L W A Y S), start your class names with uppercase letters.

answered Sep 06 '16 at 12:32

Andres

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"not only .java files.", should we need java files? – kuhajeyan Sep 06 '16 at 12:37
It's not rare that you include sources in a jar, though not necessary for it to work. – Andres Sep 06 '16 at 12:38
i have done that , but still getting this error while running- package com.org.central does not exist. I can able to import CommonMethods without any error in eclipse . – user1553680 Sep 06 '16 at 13:48

created jar file throws NoClassDefFoundError while executing it

1 Answers1