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I am having a problem writing a program and i am getting an error that
stumps me.

$ java -jar WorkApp3.jar

and i get error:

Exception in thread "main" java.lang.NoClassDefFoundError:
jxl/read/biff/BiffException
at workapp3.Main.<init>(Main.java:35)
at workapp3.Main.main(Main.java:64)

i also tried:

$ javaw WorkApp3.jar

i get a popup saying "Could not find the main class. Program will
exit."

when i run the program in NetBeans IDE 4.1 the program seems to run the
way i want it to. I can't understand what's going on??

any help would be grateful!

The Newf

On 27 Jun 2005 16:10:05 -0700, wrote:

> I am having a problem writing a program and i am getting an error that
> stumps me.
>
> $ java -jar WorkApp3.jar
....

Does this jar have a manifest file that specifies
the 'main()' class?

--
Andrew Thompson
http://www.PhySci.org/codes/ Web & IT Help
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yes my manifest file is as follows:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.2
Created-By: 1.5.0_01-b08 (Sun Microsystems Inc.)
Main-Class: workapp3.Main
X-COMMENT: Main-Class will be added automatically by build

I have only 2 files at the moment and they are both in the workapp3
directory. the files are:
1) Main.java - which is my has my main() and will eventually have the
GUI i plan to make.
2) ExcelData.java - which at the moment takes the data from an excel
document and exports it to a text file(easier to work with)

<> wrote in message
news: oups.com...
> I am having a problem writing a program and i am getting an error that
> stumps me.
>
> $ java -jar WorkApp3.jar
>
> and i get error:
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> jxl/read/biff/BiffException
> at workapp3.Main.<init>(Main.java:35)
> at workapp3.Main.main(Main.java:64)
>

I had this problem before, it is not main that is missing,
it is BiffException that is missing. BiffException is in jxl.jar
Try putting jxl.jar in your classpath.

the classpath ... that would be on the comand prompt:

$ java -jar -classpath .\jxl.jar WorkApp3.jar

right? if the jxl.jar and my WorkApp3.jar are both in the same
directory?

i still get the same error? or am i doing the classpath wrong?

<> wrote in message
news: oups.com...
> the classpath ... that would be on the comand prompt:
>
> $ java -jar -classpath .\jxl.jar WorkApp3.jar
>
> right? if the jxl.jar and my WorkApp3.jar are both in the same
> directory?
>
> i still get the same error? or am i doing the classpath wrong?

I can't remember the exact details but I was having classpath
trouble when using the "-jar" flag.
I tried a whole bunch of things and just kept banging away till it worked.
Try putting the jxl.jar in your
directory outside the jar file,
in fact try taking all the classes out of the jar file,
and using "java" instead of "java -jar"

umm... I tried as you suggested....i complied my files with little
trouble. but when i try to run them:

$ java -classpath .\jxl.jar Main
Exception in thread "main" java.lang.NoClassDefFoundError: Main

but when i tried:

$ java -classpath .\ Main
Exception in thread "main" java.lang.NoClassDefFoundError:
jxl/read/biff/BiffException
at Main.<init>(Main.java:35)
at Main.main(Main.java:64)

so in my directory i have:
ExcelData.class
ExcelData.java
jxl.jar
Main.class
Main.java

I just thought of trying this while writing this response:

$ java -classpath .\;.\jxl.jar Main

and it worked. Thank you Joan for the idea!!

now how am i able to get it so that it's all neat and tidy in a jar
file, so i don't have a bunch of files lying around? and is their a way
to set the classpath in the manifest file?

If you put the jxl.jar in the same directory as your jar and specify
"Class-Path: ./jxl.jar" in your Manifest file, you should get the
effect you are looking for.

Thanks it's working almost perfectly.. thanks.

I hope this is my final question but I need a lot of memory to run this
program. I know the command:

$ java -Xms10m -Xmx100m -jar WorkApp3.jar

But I was wondering if it were possible to add this to the manifest
file or in the program itself so that I can just double click on the
WorkApp3.jar file and it will run with the extra memory that it
requires, rather then runing from dos?

wrote:
> the classpath ... that would be on the comand prompt:
>
> $ java -jar -classpath .\jxl.jar WorkApp3.jar
>
> right? if the jxl.jar and my WorkApp3.jar are both in the same
> directory?
>
> i still get the same error? or am i doing the classpath wrong?

The -jar options and the -classpath options are incompatible. RTFM, it
came with the JDK.

Ray

--
XML is the programmer's duct tape.