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Problem with Jar

4 replies on 1 page. Most recent reply: Nov 1, 2003 5:14 PM by Senthoorkumaran Punniamoorthy

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Senthoorkumaran Punniamoorthy

Posts: 335
Nickname: senthoor
Registered: Mar, 2002

Problem with Jar Posted: Oct 23, 2003 5:14 AM
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I have written a a program to access Serial Port in Java using the Java Comm API. Everything works fine. But the moment I put the class files inside a Jar file and try to execute it with java -jar option it says

Caught java.lang.ClassNotFoundException: com.sun.comm.Win32Driver while loading
driver com.sun.comm.Win32Driver

I have copied the win32com.dll inside the JDK\bin directory.

Everything works fine until I put the classes into a Jar file. Why it is not working when the classes are indisde the Jar file? How can i make win32com.dll visible to the classes inside the Jar file?


Senthilnathan

Posts: 13
Nickname: ssnathan
Registered: Jul, 2003

Re: Problem with Jar Posted: Oct 30, 2003 4:40 PM
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you have to update ur manifest file to have the required classes in the classpath like,

Class-Path: ./lib/somejar.jar

when you do a java -jar,it normally runs with the classpath mentioned in the manifest file. This has been done for easy packaging.

Joe Parks

Posts: 107
Nickname: joeparks
Registered: Aug, 2003

Re: Problem with Jar Posted: Oct 31, 2003 3:36 AM
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javax.comm is a "standard extension". Did you put the comm.jar (or whatever it's called--I forget) into the JDK/jre/lib/ext directory?

Madhav Bhargava

Posts: 2
Nickname: utopians
Registered: Oct, 2003

Re: Problem with Jar Posted: Oct 31, 2003 1:51 PM
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If u do not want to edit the manifest file directly then u can write a java program using the Mainfest class which will do everything that u desire. This class is present in java.util.jar

Senthoorkumaran Punniamoorthy

Posts: 335
Nickname: senthoor
Registered: Mar, 2002

Re: Problem with Jar Posted: Nov 1, 2003 5:14 PM
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Joe,

Actually the requirement is comm.jar should be put inside the jdk/lib directory. Its in the installation text which comes along with the java comm download.

Thanks Madhav, your post is something interesting that I didn't know. Let me give it a try.

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