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I am having a hard time running a jar file.

3 replies on 1 page. Most recent reply: Jul 28, 2003 9:43 AM by Greg Lehane

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Clay Dagler

Posts: 21
Nickname: cdagler
Registered: Jul, 2003

I am having a hard time running a jar file.

Posted: Jul 27, 2003 9:29 PM

I am having a hard time running a jar file.

I have all of my *.java files in the same dir. My manifest file ett.mf (which is in the same dir) contains:

Main-Class: Application1

And the main class is in Application1.java This is what I get when I run these commands:

C:\Java\ett>javac *.java

C:\\Java\ett>jar cfm ett.jar ett.mf *.class

C:\\Java\ett>java - jar ett.jar
Exception in thread "main"
java.lang.NoClassDefFoundError: Application1 (wrong n
ame: ett/Application1)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass
(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown
Source)
at java.net.URLClassLoader.access$100(Unknown
Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged
(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass
(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown
Source)

Please help me fix java.lang.NoClassDefFoundError

Thanks,
Clay

Greg Lehane

Posts: 33
Nickname: glehane
Registered: Jun, 2003

Re: I am having a hard time running a jar file.

Posted: Jul 27, 2003 9:54 PM

Is your main class in a package? If so, you have to declare its full name in the manifest.

e.g. Main-Class: ett.Application1

Hope this helps,

=- Greg

Clay Dagler

Posts: 21
Nickname: cdagler
Registered: Jul, 2003

Re: I am having a hard time running a jar file.

Posted: Jul 28, 2003 6:21 AM

Yes I am using a packege and I changed my manifest file to

Main-Class: ett.Application1

and now this is what I got:

C:\Java\ett>javac *.java

C:\Java\ett>jar -cfm ett.jar ett.mf *.class

C:\Java\ett>java -jar ett.jar
Exception in thread "main"
java.lang.NoClassDefFoundError: ett/Application1

Thanks,
Clay

Greg Lehane

Posts: 33
Nickname: glehane
Registered: Jun, 2003

Re: I am having a hard time running a jar file.

Posted: Jul 28, 2003 9:43 AM

Your Application1 file should also be in a sub-directory called "ett" within your jar file.

Try moving to the parent directory (cd ..) before running the "jar" tool. Something like -

C:\Java>jar -cfm ett.jar ett.mf ett\*.class

You can open the jar file with winzip to see if the directory structure has been maintained.

=- Greg

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