Java classpath and package problems - referencing multiple jar files

Question

I have a java class I'm trying to run that references various other jar files. It looks something like this:

 package com.myapp.test;

 import java.io.File;
 import com.myapp.ref;
 import com.myapp.stuff;
 import com.strangersapp.stuff;
 import com.strangersapp.morestuff;

 public class myTest {
    public static void main... 
    ...
 }

The com.myapp.* classes are in another jar file called myapp.jar. The strangersapp classes are in a strangersapp.jar. There are several other referenced classes in various jars. My whole directory structure looks like this:

 myapp.jar
 strangersapp.jar
 someother.jar
 yetanother.jar
 etc.jar
 com\myapp\test\myTest.java

My problem is trying to compile and run this. I try the obvious but this command does NOT work. It doesnt pickup all the jar files:

 javac -cp . com\myapp\test\myTest.java
 java -cp . com.myapp.test.myTest

This command also does not work:

 javac -cp ".;*.jar" com\myapp\test\myTest.java

However, these commands do work:

 javac -cp ".;myapp.jar;strangersapp.jar;someother.jar;yetanother.jar;etc.jar" com\myapp\test\mTest.java
 java -cp ".;myapp.jar;strangersapp.jar;someother.jar;yetanother.jar;etc.jar" com.myapp.test.mTest

Would anyone know why my first java run statement is not working?? I dont want to type all the jar names out in the classpath reference...

benjamin.d · Answer 1 · 2013-11-12T23:25:43.790

0

If you use -cp you have to name all the jars you want to include. To avoid that just add them to your manifest and java will pick them up.

For javac i think you are supposed to use -classpath rather than -cp

edited Nov 12 '13 at 23:25

answered Nov 12 '13 at 23:14

benjamin.d

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Actually, that is not true in Java 6: http://stackoverflow.com/questions/219585/setting-multiple-jars-in-java-classpath?rq=1 – Daniel Kaplan Nov 12 '13 at 23:16
@tieTYT Actually it *is* true, but you can do it with a wildcard. – user207421 Nov 12 '13 at 23:18
I actually missed this feature. Anyway i think using using the manifest is a better approach as you can control what you include in your classpath. – benjamin.d Nov 12 '13 at 23:20
@EJP If you're using a wildcard, you are not naming all the jars you want to include. You're naming a pattern. – Daniel Kaplan Nov 12 '13 at 23:22

score 0 · Answer 2 · answered Nov 12 '13 at 23:19

0

You should try this:

javac -cp ".;*.jar" com\myapp\test\myTest.java
java -cp ".;*.jar" com.myapp.test.myTest

answered Nov 12 '13 at 23:19

Daniel Kaplan

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I thought that was the right command too and tried it but get an NoClassDefFoundError. I've also tried the following: javac -classpath ".;*.jar" com\myapp\test\myTest.java That didnt work either... I'm using JDK 6 and also tried JDK 7 – John Lee Nov 13 '13 at 01:35

Java classpath and package problems - referencing multiple jar files

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