Class conflicts with third-party libraries on j2ee engine

Hi,
I am deploying a repository manager into EP. In my repository I referenced javax.xml.namespace.QName, which conflicts with the one declared in jaxrpc.jar in j2ee/cluster/server0/bin/ext/webservices_lib.
I am not very clear about how NW j2ee engine loads classes, but it seems that it loads classes in j2ee/cluster/server0/bin/ext/webservices_lib first. As a result, I got a class confliction error:
java.lang.NoSuchMethodError: javax.xml.namespace.QName.<init>(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
If I remove QName.class from the jar in webservices_lib, it works fine, but this not the right way. I have read Note 990854, but not clear about how to do. Could anyone give any help?
Thanks,
Ray

Close this thread as it makes little sense.

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Hi
After some research on the use of different versions of third-party-libraries in SAP netweaver CE 7.1, I am actually quite confused and would be happy if someone could shed a light on that subject....
1. Is there a way to tell netweaver CE 7.1 to use a library in my WEB-INFlib-folder by simple configuration?
E.g. we would like to use a third-party-lib in a newer version than the one which is loaded by CE 7.1. Many application server provide a simple configuration option (e.g inside META-INFapplication.xml) where the web as can be forced to use the library inside WEB-INFlib for this application.
2.Is the concept of "heavy loading" described in a blog by Georgi Danov(Using Hibernate in SAP NetWeaver Composition Environment) the answer to question 1.?
Does it also work for other third-party-libraries than hibernate? Does it work at all?
3. In the blog mentioned in question 2, Mr. Danov is talking about "shared libraries". Does this mean, that I have to forget everything about "bundled" and "standard" libraries explained in help.sap.com/CE, if I want to create a heavy loader?
He is referencing another blog (Applications and shared libraries) which is two years old? Can I still apply the information there to CE?
4. Are "Bundled libraries" applicable when using different versions of third-party-libraries in CE 7.1?
In "Working with libraries" (http://help.sap.com/saphelp_nwce10/helpdata/en/44/f4e00e56ec0486e10000000a155369/frameset.htm) it says:
"Bundled libraries: These provide resources only to a single enterprise application, and are packed inside the application's EAR file."
=>As I want to provide the lib only to my enterprise application, I will probably have to create a bundled library, right? Does this also work if netweaver CE 7.1 uses a different version of the same library?
5. Do I need Netweaver Developer Studio for creating "bundled" libraries?
Or can I copy the binaries in the WEB-INFlib-folder of my application, deploy it and use it?
6. Is configuration of application-j2ee-engine.xml the right place to reference a third-party-library in a specific version which exists in WEB-INF/lib-folder in my application even if it exists also in another version on netweaver?
=> In the document "Troubleshooting: Finding Missing Parent-Child Relations" it says: "To implement the chain of parent-child relations in the deployment descriptor of the component, use either application-j2ee-engine.xml (for applications) or provider.xml (for libraries and services)."
=> "Creating standard libraries" (http://help.sap.com/saphelp_nwce10/helpdata/en/44/f447a8d62b0484e10000000a155369/frameset.htm9 tells me, that I have to configure the file application-j2ee-engine.xml, too.
=> But in "Working with libraries" (http://help.sap.com/saphelp_nwce10/helpdata/en/44/f4e00e56ec0486e10000000a155369/frameset.htm) it says:
"Standard libraries: These provide resources to all enterprise applications deployed on the server. They are packed in EAR files like the enterprise applications."
=> Does this mean, that I have to force Netweaver CE 7.1 to use a higher version of a certain third-party-library? Does this even work? Do all applications deployed on Netweaver 7.1 have to use this library in the higher version?
It is really confusing to read through the documentation!!! Sorry for that avalanche of questions, but I really hope it will make the issue of using libraries (especially if they exist in different versions on the CE 7.1) a little clearer!
Best regards
Bettina

Hi Bettina,
I'll try to answer your questions:
>
> Hi
>
> After some research on the use of different versions of third-party-libraries in SAP netweaver CE 7.1, I am actually quite confused and would be happy if someone could shed a light on that subject....
>
> 1. Is there a way to tell netweaver CE 7.1 to use a library in my WEB-INFlib-folder by simple configuration?
>
> E.g. we would like to use a third-party-lib in a newer version than the one which is loaded by CE 7.1. Many application server provide a simple configuration option (e.g inside META-INFapplication.xml) where the web as can be forced to use the library inside WEB-INFlib for this application.
>
First of all, the appropriate docs are here: [http://help.sap.com/saphelp_nwce10/helpdata/en/44/f4e00e56ec0486e10000000a155369/frameset.htm|http://help.sap.com/saphelp_nwce10/helpdata/en/44/f4e00e56ec0486e10000000a155369/frameset.htm].
Basically what you do is define a lib project in the studio and deploy it do the server. This may be less comfortable then just configuring manually, therefore it work better in larger environments because the server checks that libs are available in all running instances - which it could not do if you manipulate diretories manually (an approach you should never attempt in any SAP envrionment)
> 2.Is the concept of "heavy loading" described in a blog by Georgi Danov(Using Hibernate in SAP NetWeaver Composition Environment) the answer to question 1.?
>
> Does it also work for other third-party-libraries than hibernate? Does it work at all?
>
If Georgi describes it, I hope so, as he is one of our developers who knows best.
> 3. In the blog mentioned in question 2, Mr. Danov is talking about "shared libraries". Does this mean, that I have to forget everything about "bundled" and "standard" libraries explained in help.sap.com/CE, if I want to create a heavy loader?
>
"shared" are all of theses libs, as otherwise they would be specific to an application.
> He is referencing another blog (Applications and shared libraries) which is two years old? Can I still apply the information there to CE?
>
This was about anearly version of CE and even Georgi updated the blog this year to talk about slight differences. So yes, this still applies.
> 4. Are "Bundled libraries" applicable when using different versions of third-party-libraries in CE 7.1?
>
> In "Working with libraries" (http://help.sap.com/saphelp_nwce10/helpdata/en/44/f4e00e56ec0486e10000000a155369/frameset.htm) it says:
>
> "Bundled libraries: These provide resources only to a single enterprise application, and are packed inside the application's EAR file."
>
> =>As I want to provide the lib only to my enterprise application, I will probably have to create a bundled library, right? Does this also work if netweaver CE 7.1 uses a different version of the same library?
>
That depends... Your application uses it's own classloader which means it should only use your libs in case there is another version available on the server. But if you're trying to deploy a lib that is used by a service of the server (int that case loaded by the server not your classloader!) I'm not so sure.
> 5. Do I need Netweaver Developer Studio for creating "bundled" libraries?
>
> Or can I copy the binaries in the WEB-INFlib-folder of my application, deploy it and use it?
>
You need the Studio. No way around that. [Edit:] Sorry, misunderstood you here: I thought you want to copy something into the deployed directory on the server! - Of course, any deployment method would do it and though copying binaries seems to be valid. However, I'm checking this currently with development in detail.
> 6. Is configuration of application-j2ee-engine.xml the right place to reference a third-party-library in a specific version which exists in WEB-INF/lib-folder in my application even if it exists also in another version on netweaver?
>
> => In the document "Troubleshooting: Finding Missing Parent-Child Relations" it says: "To implement the chain of parent-child relations in the deployment descriptor of the component, use either application-j2ee-engine.xml (for applications) or provider.xml (for libraries and services)."
>
> => "Creating standard libraries" (http://help.sap.com/saphelp_nwce10/helpdata/en/44/f447a8d62b0484e10000000a155369/frameset.htm9 tells me, that I have to configure the file application-j2ee-engine.xml, too.
>
> => But in "Working with libraries" (http://help.sap.com/saphelp_nwce10/helpdata/en/44/f4e00e56ec0486e10000000a155369/frameset.htm) it says:
>
> "Standard libraries: These provide resources to all enterprise applications deployed on the server. They are packed in EAR files like the enterprise applications."
>
> => Does this mean, that I have to force Netweaver CE 7.1 to use a higher version of a certain third-party-library? Does this even work? Do all applications deployed on Netweaver 7.1 have to use this library in the higher version?
>
>
>
> It is really confusing to read through the documentation!!! Sorry for that avalanche of questions, but I really hope it will make the issue of using libraries (especially if they exist in different versions on the CE 7.1) a little clearer!
>
> Best regards
> Bettina
Could you tell me what you're trying to deploy? I'll try to get Georgi on this....
Regards,
Benny
Edited by: Benny Schaich-Lebek on Nov 5, 2008 1:40 PM

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Would be very grateful if someone could help me out with the following problem that I am having (apologies if this has been answered elsewhere but I have been searching the web for ages and can't find a solution )
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I am developing on SUSE 11.1 using Suns Java 1.5 and g++ 4.3.2
$LD_LIBRARY_PATH = /home/raughterd/projects/dpa/jnitest:/usr/lib/mpi/gcc/openmpi/lib
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fred.h
#ifndef __FRED_H__
#define __FRED_H__
class fred
public:
void test() const;
#endif // __FRED_H__
fred.cc
#include <iostream>
#include "fred.h"
void fred::test() const
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built it with the following
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g++ -shared fred.o -o libfred.so
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jnitest.java
class jnitest
static
System.loadLibrary("jnitest");
public native void test();
Tester.java
class Tester
public static void main(String[] args)
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javah -jni jnitest
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/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class jnitest */
#ifndef Includedjnitest
#define Includedjnitest
#ifdef __cplusplus
extern "C" {
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* Class: jnitest
* Method: test
* Signature: ()V
JNIEXPORT void JNICALL Java_jnitest_test
(JNIEnv *, jobject);
#ifdef __cplusplus
#endif
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#include <iostream>
#include "jnitest.h"
#include "fred.h"
JNIEXPORT void JNICALL
Java_jnitest_test(JNIEnv *, jobject)
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fred afred;
afred.test();
compiled with
g++ -c -Wall -I. jnitestimpl.cc
g++ -shared jnitestimpl.o -o libjnitest.so
ran the test application
java Tester
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Exception in thread "main" java.lang.UnsatisfiedLinkError: /home/raughterd/projects/dpa/jnitest/libjnitest.so: /home/raughterd/projects/dpa/jnitest/libjnitest.so: undefined symbol: _ZNK4fred4testEv
     at java.lang.ClassLoader$NativeLibrary.load(Native Method)
     at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1751)
     at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1676)
     at java.lang.Runtime.loadLibrary0(Runtime.java:822)
     at java.lang.System.loadLibrary(System.java:993)
     at jnitest.<clinit>(jnitest.java:5)
     at Tester.main(Tester.java:5)
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Forget guys. I was being a complete and utter idiot!! It was compiler options. Forgot the -lfred when building the libjnitest.so

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[email protected] .
Rebecca Tu
TechNet Community Support

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Message was edited by:
prasad chintala

Class conflicts with third-party libraries on j2ee engine

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