Using Deployable Proxy in J2ee Server library

Hallo experts,
i want to use a deployable proxy in a j2eelibrary.
In the j2eelibrary i have a plain java class, that consumes the deployable proxy.
with a webdynpro i tested it and got a classaCastException
in the java class (in j2eelibrary) where "ctx.lookup" is performed.
any idea?
when i test the deployable proxy directly from a webdynpro everything works fine.
Thank You for help
Michel

no ideas?

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To add a 3rd party jar file to be a runtime jar file to J2EE Server Component
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Here is my problem:
=====================================================
I can't open the provider.xml with SAP's special editor for the provider.xml.
The special SAP editor doesn't exist for me.
Here is my question:
=====================================================
Q1) Do I copy/paste my JAR_X file where <jar_0> is located? (Below is the
      J2EE Server Component Library SDA structure.)
Q2) If you were to update the provider.xml with notepad, what would you
type in provider.xml for JAR_X?
Q3) Is there anything else that I need to do?
Thanks,
Steve
J2EE Server Component Library SDA structure.
======================================
|-META-INF_
|         |-manifest.mf
|         |-sap_manifest.mf
|         |-SearchRules.xml
|         |-<SDA>.xml
|         |...
|-<jar_0>
|- ...
|-<jar_N>
|-dispatcher_
|           |-provider.xml
|           |-properties
|           |-runtime.properties
|           |-persistent__
|           |            |-<persistent_files(2)>
|           |-descriptors_
|                        |-<descriptor_files(3)>
|-server_____
|           |-provider.xml
|           |-properties
|           |-runtime.properties
|           |-persistent__
|           |            |-<persistent_files>
|           |-descriptors_
|                        |-<descriptor_files>
|-os_libs____
            |-<char set>__
                         |-<platform>__
                                      |-<jvm bitlength>__
                                                        |-<native lib files>

Thank you for all your solution...
my provider.xml was missing the <!DOCTYPE> tag for me to use the SAP LibraryDD Editor
Thanks again,
Steve
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE provider-descriptor SYSTEM "library.provider.dtd">
<provider-descriptor>
     <display-name>
      Your_Lib_Name
    </display-name>
     <component-name>
      Your_Lib_Name
    </component-name>
     <major-version>6</major-version>
     <minor-version>40</minor-version>
     <micro-version>0</micro-version>
     <provider-name>
      sap.com
    </provider-name>
     <references>
          <reference
               provider-name="sap.com"
               strength="weak"
               type="library">Your_Lib_Name</reference>
     </references>
     <jars>
          <jar-name>my_jar.jar</jar-name>
     </jars>
</provider-descriptor>

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J2EE Server Component DC - signauth/libraryimpl
Java External Library DC - signauth/library
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Hi Experts
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HI Gurus,
I am following this article below which helpfully explains how to create a proxy. So far so good. I have been able to create a proxy. However, the article only describes how to build a proxy.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/70c7d0f7-153d-2a10-5d96-d334b67cd771
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http://help.sap.com/saphelp_nw70/helpdata/EN/5c/971740198d8f5ce10000000a155106/frameset.htm
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Praveen Gudapati

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Hi
Since my WebAS J2EE server is behind a proxy, any application from within the server is not able to connect to the internet for ex: webdynpro application is not able to collect data from a webservice.
I've gone through previous posts but were not quite useful.
I tried applying parameters to the server0 java process
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I'm creating an External Library DC to be accessed by an EAR Project using reference. I understand you need to place this DC into a J2EE Server Component Library DC to be able to be deployed. There is a choice for this DC on 7.0. Why there is none in 7.1? Am I missing something or there is a new way to accomplish this?

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http://help.sap.com/saphelp_nwce10/helpdata/en/45/c93bc6a24a4ebce10000000a11466f/frameset.htm

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I am using a work laptop and have the same problem. When I try to change the "configure proxy", they only available option is "use this proxy server for all protocols". Could it be that my system administrator blocked me from changing it since they don't want us to use Firefox.
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB6.4; FNGP_SYS)

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
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You can use "Disable all add-ons" on the ''Safe mode'' start window.
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