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Java Forum / First Aid / March 2008Main-Class conflicts with the table of contents for a jar
I'm not sure what it's called, but the directory structure for this jar looks wrong: home/thufir/java/build/com/web_tomorrow/CPTest1.class should be: com/web_tomorrow/CPTest1.class but I'm not sure how to correct it. Is that a result of how the jar was created or how javac was invoked? thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ ll total 8 drwxr-xr-x 3 thufir thufir 4096 2008-03-21 00:16 com -rw-r--r-- 1 thufir thufir 1411 2008-03-21 00:16 foo.jar thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ jar -tf foo.jar META-INF/ META-INF/MANIFEST.MF home/thufir/java/build/com/web_tomorrow/CPTest1.class home/thufir/java/build/com/web_tomorrow/CPTest2.class thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ jar -xf foo.jar META-INF/MANIFEST.MF thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ cat META-INF/MANIFEST.MF Manifest-Version: 1.0 Created-By: 1.6.0_03 (Sun Microsystems Inc.) Main-Class: com.web_tomorrow.CPTest2.class thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ It just seems to have "too much" information. thanks, Thufir > I'm not sure what it's called, but the directory structure for this jar > looks wrong: I believe that I've fixed that inconsistency but not fixed the general problem. When the class files are extracted from the jar they run as expected. When the Main-Class ?parameter? for the manifest is set to the class file the resulting error is: Exception in thread "main" java.lang.NoClassDefFoundError: com/ web_tomorrow/CPTest2/class in more detail: thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ ll total 4 -rw-r--r-- 1 thufir thufir 1319 2008-03-21 00:29 foo.jar thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ java -jar foo.jar Exception in thread "main" java.lang.NoClassDefFoundError: com/ web_tomorrow/CPTest2/class thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ jar -tf foo.jar META-INF/ META-INF/MANIFEST.MF com/web_tomorrow/CPTest1.class com/web_tomorrow/CPTest2.class thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ jar -xf foo.jar thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ cat META-INF/MANIFEST.MF Manifest-Version: 1.0 Created-By: 1.6.0_03 (Sun Microsystems Inc.) Main-Class: com.web_tomorrow.CPTest2.class thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ java com.web_tomorrow.CPTest2 Run CPTest2.main() thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ (source code from http://www.kevinboone.com/classpath.html ) thanks, Thufir >thufir@arrakis:~/java/build$ >thufir@arrakis:~/java/build$ ll Perhaps you could post your jar file on the web somewhere. I have no clue what you are doing here.  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > Perhaps you could post your jar file on the web somewhere. I have no > clue what you are doing here. http://hawat.thufir.googlepages.com/foo.jar thanks, Thufir It was just an error with the manifest. I included the .class suffix in the Main-Class :( works now :) thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ java -jar foo.jar Run CPTest2.main() thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ cat META-INF/MANIFEST.MF Manifest-Version: 1.0 Created-By: 1.6.0_03 (Sun Microsystems Inc.) Main-Class: com.web_tomorrow.CPTest2 thufir@arrakis:~/java/build$ thufir@arrakis:~/java/build$ -Thufir >http://hawat.thufir.googlepages.com/foo.jar I had a look in your jar. I examined it with Jarlook: see http://mindprod.com/products1.html#JARLOOK META-INF/ META-INF/MANIFEST.MF com/web_tomorrow/CPTest1.class com/web_tomorrow/CPTest2.class It looked like one of mine except you don't have what I would consider a legit package name. See http://mindprod.com/jgloss/package.html I would have used a 3-part name like com.web_tomorrow.cp Which presumes you are the proud owner of web_tomorrow.com Your manifest looks like this: Manifest-Version: 1.0 Created-By: 1.6.0_03 (Sun Microsystems Inc.) Main-Class: com.web_tomorrow.CPTest2.class Here is what one of my manifests look like: Manifest-Version: 1.0 Created-By: Jakarta Ant 1.7.0 (December 13 2006) Main-Class: com.mindprod.bio.Bio Name: com/mindprod/common11/Limiter.class Last-Modified: Thu, 20 Mar 2008 15:58:29 PDT Content-Location: E:\com\mindprod\common11\Limiter.class ... with an entry for each class. The problems include: 1. you appended .class where you should not. 2. You are missing entries for all the other classes. See http://mindprod.com/jgloss/ant.html for how to build your manifest properly or http://mindprod.com/jgloss/jarexe.html and http://mindprod.com/jgloss/jar.html for how to do it the old fashioned way. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > The problems include: > 1. you appended .class where you should not. 2. You are missing entries [quoted text clipped - 4 lines] > http://mindprod.com/jgloss/jar.html > for how to do it the old fashioned way. Thanks for checking it out :) the java code, and the example, comes from: http://www.kevinboone.com/classpath.html It's working sufficiently that I didn't realize that entries for other classes are missing, thanks for pointing that out. -Thufir Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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