Way to create the library

You must not create any library, if you use the same workspace.

Please read this points:
->Just use the source

In the properties of the project which has the dependencies you can add another source-folder:

Properties > Java Build Path > Tab: Source > Add Folder...

In the Project Tab you can "add" the whole project to the other project, too. There are many ways to achieve your goal.

->Create and add the library to the Build-Path

Adding an existing Jar (your own library):

If it is in the workspace:

Properties > Java Build Path > Tab: Libraries > Add JARs...

If it is somewhere on the drive:

Properties > Java Build Path > Tab: Libraries > Add External JARs...

->Exporting a source folder as a library

text Menu of Source Folder > Export > Jar File

There are two types: Executable Jars and "normal" Jars. You don't need an executable Jar.

Thanks a lot.
Does it mean Jar file is executable, which can also be used as a library?
Is there any tutorials to create library/jar files?

I create one project
https://dl.dropboxusercontent.com/u/40211031/JLib.zip

using Eclipse. How to find out jar file from it?

Please check this link for more details....
http://www.mkyong.com/ant/ant-how-to-create-a-jar-file-with-external-libraries/

http://www.vogella.com/tutorials/JavaLibraries/article.html#jarfiles_executable

http://viralpatel.net/blogs/create-jar-file-in-java-eclipse/

https://www.cs.utexas.edu/~scottm/cs307/handouts/Eclipse%20Help/jarInEclipse.htm

hope this will help you to solve the problem.

How to get the Jar file to the recent project? Thanks

Right click on your project.
Choose Export -> Java -> JAR file
Choose included files and name output jar, click "Next"
Check "Save the description of this JAR in the workspace" and chose a name for the new jardesc file.

Many thanks. I try to run against the Jar file like

C:\Eclipse\JLib>java -jar JLib.jar
no main manifest attribute, in JLib.jar

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how to correct the message prompted in above?

If you dont have a manifest in your jar invoking java -jar will not work.

Use this command if you dont have a manifest:

java -cp foo.jar full.package.name.ClassName

look at this conversations:

http://stackoverflow.com/questions/9689793/cant-execute-jar-file-no-main-manifest-attribute
http://stackoverflow.com/questions/1238145/how-to-run-a-jar-file

C:\Eclipse\JLib>java -jar JLib.jar

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means it's a stand-alone app. Is it?

Thanks all.

CEHI,
yes

Then you haven't named the main class correctly in the manifest (done in the IDE if using one). Use the fully-qualified package name

Thanks. can I have the details to create manifest, to the project, using Eclipse?

follow this link to create manifest using eclipse........

http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Ftasks%2Ftasks-35.htm

I also get it from Help of Eclipse. Can you show me in details to do this? thanks

as per your question you can also use plugin........see below link

http://www.acnenomor.com/6064241p2/eclipse-create-runnable-jar-with-manifest-possible

Can I work with manifest, without the plug-in?

in Eclipse you can but.............but it is not runnable

If you're using Eclipse, you export as a jar to accomplish your goal:

http://help.eclipse.org/luna/topic/org.eclipse.jdt.doc.user/reference/ref-export-jar.htm

Make sure the application's entry point is set in the wizard. Then it will be runnable

Thanks a lot.
How to to resolve this

Description	Resource	Path	Location	Type
CalCl cannot be resolved to a type	CalCl3.java	/JLib3/src/CalCl3	line 3	Java Problem

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using these codes?

package CalCl3;

public class CalCl3 implements CalCl {

}

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While CalCl does exists within the another Java project, that is
https://dl.dropboxusercontent.com/u/40211031/JLib2.zip

I get the same problem, even if I adjust the codes to

package CalCl3;
import JLib2.Calcl;

public class CalCl3 implements CalCl {

}

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I'm not really much of an Eclipse user, but does it run properly in the IDE?

I'm to compile it and then have got the issue. thanks

Can you try to open it, if available? thanks.

There's no main method in your last source - so it will never 'run' as such, but it will compile

Sorry, I am not able to compile these

package CalCl3;
import JLib2.Calcl;

public class CalCl3 implements CalCl {

}

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why?

It's probably something to do with the way you have the projects linked. That import statement is also probably wrong
You didn't actually include Calc3 in the source you linked to

What to adjust to the codes above?

You need to name the packages correctly (I don't know what the names should be) and make sure the projects are linked thru the IDE

what to adjust to make it work?

what do you mean by "linked thru the IDE"?

I mean that IDEs give you the facility of sharing code amongst projects but they have to be told to do that. In your case, it sounds as if it could be better to create a library that's reusable rather than have it in a shared project.

But I did attach jar file to JLib3. Can you please tell me what is wrong inside it below?
https://dl.dropboxusercontent.com/u/40211031/JLib3.zip

That doesn't contain source for interface CalCl

No, JLib2.jar is under Referenced Libraries of JLib3 project.

See the attached
t965.png

You misunderstand - i'm saying it's not in that download - nor is there any jar IN it

Do you see the attached screenshot?

Well that looks good as far as the IDE is concerned, but of course doesn't help with that download. Find that referenced jar and run the following command on it, having changed to the directory which contains it. Then post the output please

jar tf  JLib2.jar

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Here are what I get

C:\Eclipse\JLib2>jar tf JLib2.jar
'jar' is not recognized as an internal or external command,
operable program or batch file.

C:\Eclipse\JLib2>java
Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
....

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