Problem using external jars in my java component

Hi Guys,
I just wanted to ask how to properly reference an external jar to a java dc. I already have an external library dc which contains my external jars and also compilation and assembly public parts, a j2ee library which has the assembly public part of the external jars that is deployed to the server, a java dc which has the compilation public part of the external jar.
My problem is whenever I trigger a method of the java dc in my webdynpro dc I'm having an exception. weird thing is when I put the whole method from the java dc to the webdnypro dc it functions well. So I'm thinking if the interaction between my java dc and j2ee lib dc has to do with this maybe I'm missing some configuration.
need your insight on this one.
Thanks,

Hi TznHuang,
Pleaserefer to this blog might helpful for you
/people/raphael.vogel/blog/2008/05/05/how-to-use-external-libraries-in-the-sap-component-model-part-ii
Also please build external DC and then sync sorurces and sync used DC from inactive DC TAB for DC where you have used
external DC.
Hope bit helps
Regards
Arun Jaiswal

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How to use external jars in NW2004

Hello Experts,
can i use the same approach mentioned in the below Weblog for using the external jars in NW2004.
/people/bertram.ganz/blog/2008/11/24/how-to-use-external-jar-files-in-web-dynpro-development-components
and if not then what will be the best way to achieve it in NW2004.
Please provide your inputs on above.
Regards,
Siddharth

Hi Sidharth,
If you are using web dynpro DC perspective then you need to follow the following points to use the external jar files in it.
1. Create a external library project.
2. copy the external jars in the library folder os the projects.
3.) Select all the jars from the u201CLibrariesu201D folder, Right click and then select Development Component and click on Add to Public Part
4.Select the first Radio Button (Provides an API)and give some nameto it.
5. Repeat the step no 3 but now select the second radio button other than as selected in step no 4.
6. Now build your lirary DC.
7. Now create a j2ee DC project.
8. ) Expand the node DC Definition and Right Click on Used DC. Select Add Used DC.
9. Select the External Library DC with build time dependency.
10.Right click on the J2EE DC and then select Development Component followed by Build
11. Right click on the J2EE DC and then select Development Component followed by Deploy
now you can use both the libary DC and the j2ee DC in your web dynpro DC as used DC.
But if you have created a web dynpro project only(but not DC) than you can directly add the external jars in java build path
hope this will help
regards
Narendra
Edited by: Narendra Singh on Oct 27, 2009 11:22 AM

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External jars, if very general, could be placed in the directory jre/lib/ext.
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The manifest.mf migth be looked into, and of course you need to communicate your patching!
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For that the jar tool documentation might explain it better than I.

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I was using mail.jar library for swing application to send and receive emails. It just works perfect when I run with netbeans. But when I run the executable jar file at dist folder it runs but mail related functions doesn't work.What should I do now to make it work with mail features outside netbeans.
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Edited by: 899657 on Dec 24, 2011 5:07 AM

899657 wrote:
No. Because I am running the jar file which is created by netbeansNetbeans creates a 'dist' directory in which it puts your jar and a "dist/lib' directory in which it puts the dependent jars that are added to the project using 'project right mouse click'->Properties->Libraries. I would expect to see this 'dist/lib' directory contain mail.jar and activation.jar and any other jars that your jar needs. Within your program jar's manifest I would expect to see the Class-Path attribute have relative reference these jars ( lib/mail.jar lib/activation.jar ) and for the Main-Class attribute define your main class.
Given this setup then you should be able to just type -
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Good day!
A have a little program:
import org.apache.log4j.Logger;
public class CMDClient {
     static Logger log;
     public static void main(String args[]) throws Exception {
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          System.exit(1);
}I created a test.jar file, containing only this test class. When I start it by java -jar test.jar it cannot find linked (through import) Log4j library. Is there a way to link external jar to "jared" application?
Good day!
A have a little program:
import org.apache.log4j.Logger;
public class CMDClient {
     static Logger log;
     public static void main(String args[]) throws Exception {
          log.info("test");
          System.exit(1);
I created a test.jar file, containing only this test class. When I start it by java -jar test.jar it cannot find linked (through import) Log4j library. Is there a way to link external jar to "jared" application?
Good day!
A have a little program:
import org.apache.log4j.Logger;
public class CMDClient {
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     public static void main(String args[]) throws Exception {
          log.info("test");
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I created a test.jar file, containing only this test class. When I start it by java -jar test.jar it cannot find linked (through import) Log4j library. Is there a way to link external jar to "jared" application?
Error was: java.lang.NoClassDefFoundError

There's a Class-Path attribute in the manifest.

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I am developing a custom web dynpro component. I need to use some of the JARs delivered by SAP such as com.sap.security.api (can be found in \SAP\IDE\IDE70\eclipse\plugins). I have included the JAR files to my project in Properties->Java Build path->Libraries). Everything is working fine: I can build/deploy the application and it is running fine in the application server.
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Edited by: Pa Pa on Nov 21, 2009 2:07 PM

Hi Pa,
To use any jar in your DC on NWDI track, you need to follow the following steps:
1. Go to Your project>Used DCs and try to add a new one by locating the DC among those which are already present on the track.
2. If you are not able to locate any DC with the required jars then,
a. Create an external library DC where you need to add all the jars in the library folder of the project using an activity.
b. Create public parts for compile time and run time for this dc.
c. Deploy the DC.
d. Goto src folder of your dc and say Add files to DTR (your jars would be on the track)
e. Deploy the external library DC so that the Jars are deployed on the portal server.
f. Add the public parts of this External Library DC under used DCs of your development component.
g. Add this external library under library references of your project.
h. Build and deploy.
i. Now try activating your activity.
Use the following link to know how to execute these steps.
[Add and Use Jars through used DCs|http://help.sap.com/saphelp_nw70ehp1/helpdata/en/46/3ce3e4df201d63e10000000a11466f/frameset.htm]
[Screen Shots|http://www.sdn.sap.com/irj/scn/weblogs;jsessionid=(J2EE3417100)ID1078501850DB00490474849923920126End?blog=/pub/wlg/9517]
Please let me know, if you ahave any doubt.
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Tushar Sinha

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Message was edited by: Chemmanz

Hi Chemmanz,
For user defined functions, it is not necessary to use the external jar files.
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I have created a Web Dynpro DC and I need to use an external JAR file.
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http://help.sap.com/saphelp_nw70/helpdata/en/46/3ce3e4df201d63e10000000a11466f/frameset.htm
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Hello.
I created a jar file like that:
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Hello.
I created a jar file like that:
jar -cvf0 WarShell.jar WarShell.class
I want to use WarShell.class in Eclipse but it not in
my classpath,so I choose [Project] -> [Properties]
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Problem using external jars in my java component

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