Using External java within web dynpro DC

Hi
I'm new in web dynpro and I'm facing a problem.
I'm doing a web dynpro DC application and I want to use some external java classes I have created into my DC. But I don't really know how to do it, I tried EJB but I don't exactly how it works.
by the way, I was using a stand along web dynpro before and this worked fine, I just needed to create a package within my web dynpro project with all my class architecture to have them directly. but now with the DC stuff, it's not the same at all. so please help
thanks

Hi
Better you create a Java Development component and add all your java classes to that DC and build it.
Create a webdynpro DC to develop front end and add the java DC in used DC's of your Webdynpro DC.
This is the way you can use the java classes effectively with out redundancy.
If you create a package inside a normal webdynpro project, then you can not reuse them later in other webdynpro proj
Go with SAP component model by creating 2 development components one for java and other for webdynpro and define the reusability (Used DC's) in DC Metadata.
Regards
Kalyan

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Use external libraries in web dynpro java

Dear Experts,
I need to add an external library to my project.
Anyway, I do not know how to do it because it gives me many problems.
I tried modifying the classpath and placing it in the lib folder of the project from "Navigator".
Also project properties, add. jar outside, and throws me the following error:
[javac] Compiling 213 source files to D:\WORK\WORKSPACE\7.2.jdi\LocalDevelopment\t\2BF09F48E6D0E2C201262098A0E4D79F\classes
     [javac] ERROR: D:\WORK\WORKSPACE\7.2.jdi\LocalDevelopment\t\2BF09F48E6D0E2C201262098A0E4D79F\gen_wdp\packages\elsys\com\.....\wd\comp\....\MainView.java:34: package com.estaf does not exist
     [javac] ERROR: import com.estaf.jpay;
     [javac] ERROR:
Given these errors, I know my includes without problems and I can instantiate objects from library classes, but these errors I can not deploy.
I read the following link:
/people/raphael.vogel/blog/2008/05/05/how-to-use-external-libraries-in-the-sap-component-model-part-ii
I did everything the tutorial. I created the external library. I can see in my project "DC-Definition -> Used DCs" The public parts assembly and compilation. Now the problem is that it still does not recognize the classes of the libraries you want to use.
A level of code, when I try to instantiate the class does not recognize me. What could be missing? I did a couple of times step by step and gives me the same results.
I use SAP NetWeaver Developer Studio SAP NetWeaver 7.2 SP03 PAT0007 version.
Infinitely appreciate any help. Thank you very much.
Rasim
Edited by: Rasim Donmez on Apr 11, 2011 4:50 PM
Edited by: Rasim Donmez on Apr 11, 2011 4:51 PM

Hi,
please find below path for adding External Jar files.
right click on the webdynpro dc and select the properties .
then clcik on Java Build path->select libraries->select External External Jars.
after that just rebuild your project (not Build).
Regards,
Govindu
Edited by: Govindu Nagotla on Apr 12, 2011 2:28 PM

Using External Library in Web Dynpro - Error

Hello,
I want to use an external library in a web dynpro. I use WAS 6.40 SP12.
1. I have created an dc web dynpro app
2. I have created an dc external library app
3. I have importet the jar to the external library
4. I have published the jar as public part
5. I have imported the public part to web dynpro
If I build the project I get no error. If I deploy an run the project then I get an error stacktrace:
java.lang.NoClassDefFoundError: com/sap/netweaver/bc/rf/util/uuid/UUID
NoClassDefFoundError - I think the jar-file was not deployed. What is wrong?
Greetings
Thomas

Hi THomas,
Please explain how you are adding the jars into the publicpart of the Libary DC.
You need to create 2 public parts .
1. Assembly
2. Compilation
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Using external libraries in Web Dynpro DCs

Hi,
I've followed the example in the following blog for using external libraries in my Web Dynpro (WD) DCs:
/people/valery.silaev/blog/2005/09/14/a-bit-of-impractical-scripting-for-web-dynpro and some other messages in the forums. However, it isn't working exactly as described in the blog. I have to twist it a bit to get it work. I were wondering if anyone has any better solution for this problem?
The senario is like this:
- External libraries: a.jar, b.jar
- WD DCs: wd1, wd2 in that wd1 and wd2 are both using external libraries a.jar and b.jar; wd1 is a library DC that can be reused in wd2.
According to the example in the blog, the following steps are carried out:
- Step 1. Create an external library DC, add a.jar and b.jar to public part "ExternalLibs" as described in the blog.
- Step 2: Create, build, deploy J2EE Server / Library DC. (Add reference to the public part of the external library DC as a used DC, with both Build-time and Run-time dependency).
- Step 3: Create WD DC wd1, add used DCs and WD reference libraries as described in the blog. Add WD components as public part. Build and deploy WD DC wd1.
All are ok so far!
- Step 4: Create WD DC wd2, add used DCs and WD reference libraries as before. Try to build and FAIL!
The error occurs here because wd2 cannot access to the classes in the external libraries, similar to the problems described in thread Re: Problems with deploying a JAR file.
I've found a workaround, although quite tedious and cumbersom, but it works. My solution so far is:
- Round 1: Perform those 4 steps above, but in step 1, after adding the jars to the public part "ExternalLibs", set the property of the public part "purpose" to "compilation", then build and deploy all other DCs accordingly.
- Round 2: Change the public part "ExternalLibs" property to "assembly", then bulid and deploy all other DCs again.
And now I can reuse the external libraries in my WD DCs as well as WD DCs as library in other WD DCs.
I know it's not an elegant solution. So I were wondering if the experts out there can help me with better solutions?
Many thanks in advance for your help.
Regards,
Van
Edited by: Van Hai Ho on Dec 18, 2007 3:30 PM
Edited by: Van Hai Ho on Dec 18, 2007 3:31 PM

Hi Pascal,
Thank you so much for your help. Your suggestion has helped to make my life a lot easier.
Regards,
Van

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Hi there,
Can you give me some guidance for including external jars in Web Dynpro for Java (CE 7.1.1)?
I vainly tried for some hours now to get my external jars running in the new version of web dynpro (part fo Composition Environment 7.1.1).
The routines described in some other threads didn't help me. For example, in CE 7.1.1 there's no DC Metadata that would allow me to add an external library.
FYI, in the error message during build it simply says the package is not found.
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Holger

See http://help.sap.com/saphelp_nwce10/helpdata/en/d7/fc139ba1549047a5372ad3c0d540ea/frameset.htm
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Hello,
we're stuck here.
We're trying for a week now to include external libraries(e.g. Hibernate) into our Web DynPro Project, without success so far.
We read every single forum and blog entry we could find on this topic.
E.g.: /people/valery.silaev/blog/2005/09/14/a-bit-of-impractical-scripting-for-web-dynpro
We're running Netweaver 2004s SP9 Trial Version.
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Edited by: Christian Wieland on Jan 31, 2008 11:22 AM

Hallo Christian,
this is a bug which should be fixed in NW 7.0 SP9 patch1: [Look at this forum thread on the same issue: External Library DC in NW2004s SP09|External Library DC in NW2004s SP09].
Regards, Bertram

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Raj

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http://help.sap.com/saphelp_nw04/helpdata/en/b8/aa343e32ff1033e10000000a114084/frameset.htm
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Message was edited by:
        Anilkumar Vippagunta

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any help..

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I have created a Web Dynpro DC and I need to use an external JAR file.
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