Web Service Consumption in Web Dynpro Java

Hi,
I'm using NetWeaver 2004s for Java. I have generated a Web Service out of a BAPI. I use that Web Service in a Web Dynpro Java Application as Model. Model generation works fine. But when I call the Web Service during execution of the corresponding Web Dynpro Application, I get the following Exception:
"java.rmi.RemoteException: Service call exception; nested exception is: java.lang.Exception: Call to returned http code 500 with unacceptable content type (text/html; charset=iso-8859-1). <HTML> <HEAD> <TITLE>Unknown Host</TITLE> </HEAD> <BODY BGCOLOR="white" FGCOLOR="black"> <H1>Unknown Host</H1> <HR> Description: Unable to locate the server named "us0308.wdf.sap.corp" --- the server does not have a DNS entry. Perhaps there is a misspelling in the server name, or the server no longer exists. Double-check the name and try again. <HR> </BODY>"
Testing the Web Service via transaction WSADMIN works fine. Can anybody give me an advise how to solve that problem?
Thanks in advance!
Regards,
Frank

Had Exactly same problem with authorization issues on the server hosting the webservices.
Create a CPIC user Id on the server hosting the webservice. The user id should have authorization to execute the webservice.
Create a webservice destination in VA for the said webservice using the user id
1. Log on to the J2EE Engine as an administrator using the Visual Administrator.
2. Expand -> Server ->Services.
3. Select the Destinations service.
4. Under Destinations, select HTTP and choose New
You need to create two destinations one for matadata and another for execution data.
Use the destinations while creating the WS model in NWDS.
if you have issues importing the model using the URL, you can create the model using the WSDL and use the WS Destinations to execute it.
I am following the same approach after i had faced similar issues with webservices on PI7.1 and Portal 7.0
About the option to use _setusername, _set...., not all webservices come with the _set methods.
and moreover if you do that, it would be more of hardcoding in the code, which should be avoided.
Regards,
Nitin
Edited by: Nitin Mahajan on Jun 11, 2009 6:11 PM

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<code>
java.lang.IllegalArgumentException: Target role name 'GetProductMaster' not defined for model class 'Request_GetProductMaster'
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</code>
 
The model is imported without errors, and gives the following tree: 
<ul>
<li>ProdMast</li>
<ul>
<li> Model Classes</li>
<ul>
<li> GetProductMaster</li>
<li> GetProductMasterResponse</li>
<ul><li> GetProductMasterReturn</li></ul>
<li> Product</li>
<li> Request_GetProductMaster</li>
<ul><li> GetProductMaster</li>
<li> Response</li></ul>
<li> Response_GetProductMaster</li>
<ul><li> Fault</li>
<li> GetProductMasterResponse</li></ul>
<li> WebServiceException</li>
</ul></ul></ul>
 
If you know what could be causing this problem or a way to make it work please let me know 
Thanks, 
Guillermo

The WSDL that I'm using (generated by Apache Axis) is the following: 
<code>
<?xml version="1.0" encoding="UTF-8"?> <wsdl:definitions targetNamespace="http://XXX.XXX.XXX.XXX:9876/axis/services/WebMasterData" xmlns:apachesoap="http://xml.apache.org/xml-soap" xmlns:impl="http://XXX.XXX.XXX.XXX:9876/axis/services/WebMasterData" xmlns:intf="http://XXX.XXX.XXX.XXX:9876/axis/services/WebMasterData" xmlns:tns1="http://ws.web.test.company.com" xmlns:tns2="urn:Product" xmlns:tns3="urn:WebServiceException" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:wsdlsoap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <!WSDL created by Apache Axis version: 1.2 Built on May 03, 2005 (02:20:24 EDT)> <wsdl:types> <schema elementFormDefault="qualified" targetNamespace="http://ws.web.test.company.com" xmlns="http://www.w3.org/2001/XMLSchema"> <import namespace="urn:WebServiceException"/> <import namespace="urn:Product"/> <element name="getProductMaster"> <complexType> <sequence> <element name="sessionId" type="xsd:string"/> <element name="language" type="xsd:string"/> </sequence> </complexType>>
 </element> <element name="getProductMasterResponse"> <complexType> <sequence> <element maxOccurs="unbounded" name="getProductMasterReturn" type="tns2:Product"/> </sequence> </complexType> </element> </schema> <schema elementFormDefault="qualified" targetNamespace="urn:Product" xmlns="http://www.w3.org/2001/XMLSchema"> <import namespace="urn:WebServiceException"/> <complexType name="Product"> <sequence> <element name="num_conv_stat_cs" nillable="true" type="xsd:int"/> <element name="cat_desc" nillable="true" type="xsd:string"/> <element name="prod_typ" nillable="true" type="xsd:string"/> <element name="dst_chan" nillable="true" type="xsd:string"/> <element name="old_prod_nbr" nillable="true" type="xsd:string"/> <element name="slsorg" nillable="true" type="xsd:string"/> <element name="id" nillable="true" type="xsd:string"/> <element name="div" nillable="true" type="xsd:string"/> <element name="nwt_val" nillable="true" type="xsd:decimal"/> <element name="sls_uom" nillable="true" type="xsd:string"/> <element name="den_conv_alt_uom" nillable="true" type="xsd:int"/> <element name="nwt_un" nillable="true" type="xsd:string"/> <element name="num_conv_layer" nillable="true" type="xsd:int"/> <element name="prod_grp" nillable="true" type="xsd:string"/> <element name="brn_desc" nillable="true" type="xsd:string"/> <element name="hilgt" nillable="true" type="xsd:string"/> <element name="num_conv_pl" nillable="true" type="xsd:int"/> <element name="den_conv_stat_cs" nillable="true" type="xsd:int"/> <element name="den_conv_layer" nillable="true" type="xsd:int"/> <element name="extl_prod_nbr" nillable="true" type="xsd:string"/> <element name="net_vol_un" nillable="true" type="xsd:string"/> <element name="num_conv_alt_uom" nillable="true" type="xsd:int"/> <element name="den_conv_pl" nillable="true" type="xsd:int"/> <element name="bs_uom" nillable="true" type="xsd:string"/> <element name="net_vol_val" nillable="true" type="xsd:decimal"/> <element name="prod_desc" nillable="true" type="xsd:string"/> </sequence> </complexType> </schema> <schema elementFormDefault="qualified" targetNamespace="urn:WebServiceException" xmlns="http://www.w3.org/2001/XMLSchema"> <import namespace="urn:Product"/> <complexType name="WebServiceException"> <sequence/> </complexType> </schema> <schema elementFormDefault="qualified" targetNamespace="http://XXX.XXX.XXX.XXX:9876/axis/services/WebMasterData" xmlns="http://www.w3.org/2001/XMLSchema"> <import namespace="urn:WebServiceException"/> <import namespace="urn:Product"/> <element name="fault" type="tns3:WebServiceException"/> </schema> </wsdl:types> <wsdl:message name="WebServiceException"> <wsdl:part element="impl:fault" name="fault"/> </wsdl:message> <wsdl:message name="getProductMasterRequest"> <wsdl:part element="tns1:getProductMaster" name="parameters"/> </wsdl:message> <wsdl:message name="getProductMasterResponse"> <wsdl:part element="tns1:getProductMasterResponse" name="parameters"/> </wsdl:message> <wsdl:portType name="WebMasterData"> <wsdl:operation name="getProductMaster"> <wsdl:input message="impl:getProductMasterRequest" name="getProductMasterRequest"/> <wsdl:output message="impl:getProductMasterResponse" name="getProductMasterResponse"/> <wsdl:fault message="impl:WebServiceException" name="WebServiceException"/> </wsdl:operation> </wsdl:portType> <wsdl:binding name="WebMasterDataSoapBinding" type="impl:WebMasterData"> <wsdlsoap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/> <wsdl:operation name="getProductMaster"> <wsdlsoap:operation soapAction=""/> <wsdl:input name="getProductMasterRequest"> <wsdlsoap:body use="literal"/> </wsdl:input> <wsdl:output name="getProductMasterResponse"> <wsdlsoap:body use="literal"/> </wsdl:output> <wsdl:fault name="WebServiceException"> <wsdlsoap:fault name="WebServiceException" use="literal"/> </wsdl:fault> </wsdl:operation> </wsdl:binding> <wsdl:service name="WebMasterDataService"> <wsdl:port binding="impl:WebMasterDataSoapBinding" name="WebMasterData"> <wsdlsoap:address location="http://XXX.XXX.XXX.XXX:9876/axis/services/WebMasterData"/> </wsdl:port> </wsdl:service> </wsdl:definitions> 
</code>

Difference between Web Service Developer and Web Compononent Developer?

What's the difference between Web services Developer and Web Component Developer? What's their job description. I'm aiming to be a web application developer. Which track should I follow?

Here is another article on J2SE vs JEE:
http://www.velocityrevies.com/forums/t151124-what-is-j2se-vs-j2ee.html
I believe the people who said JSE is only for desktop development are not correct, as well as their saying their are 2 kinds of developer (web service and component).
As I understand it, web service developers provide a way to expose the data and functionality of a program written in a particular language (such as Java or C#) as XML documents to anyone subscribing to the service over the internet. The remote applications subscribing to the service therefore can be written in any other language. For example, imagine a Cobol program trying to get data from a program written in Java. Since both cobol and Java should have ways to parse XML documents, they don't have to know each other's syntax. There are many programs written in many many languages in the web and XML is a standard way for them to communicate. Web Services are an advanced topic and you shouldn't worry about it until you master web applications and/or desktop applications.
As I understand it, a web component developer creates java widgets that produce some visual image with basic functionality associated with it. For example, an html button. These widgets are used by other developers for the presentation layer when creating a web application or desktop application. I'm not sure about this definition since I never messed with web component development. I suggest you keep way from this specialized area on concentrate on web applications and/or desktop applications.
You can consider application development as devided into two general categories. Web development and Desktop development (there are others). Web development is further broken down into browser based applications and mobile device applications. I suspect their are more jobs in web development than desktop development. I therefore suggest you concentrate on browder based web development (just my opinion). However, each has their advantages and disadvantages over each other, depending on the task at hand(http://stackoverflow.com/questions/905365/desktop-development-versus-web-development)
Disclaimer:
http://myweb.accessus.net/~090/univdisc.html

Consume a Web Service from a Web Page

I had tried out the Tutorial "Consume a Web Service from a Web Page". I have encountered this error :
; nested exception is: java.lang.NullPointerException.
oracle.adf.model.adapter.AdapterException: DCA-40010: The Web Service call failed. The service returned a SOAP fault with the message: [S:Receiver] EJB Exception: : java.lang.NullPointerException
     at oracle.model.freightjb.CalculateFreightBean.calculateFreightCost(CalculateFreightBean.java:23)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
     at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
     at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
     at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
     at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
     at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
     at com.bea.core.repackaged.springframework.jee.spi.MethodInvocationVisitorImpl.visit(MethodInvocationVisitorImpl.java:37)
     at weblogic.ejb.container.injection.EnvironmentInterceptorCallbackImpl.callback(EnvironmentInterceptorCallbackImpl.java:55)
     at com.bea.core.repackaged.springframework.jee.spi.EnvironmentInterceptor.invoke(EnvironmentInterceptor.java:50)
     at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
     at com.bea.core.repackaged.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
     at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
     at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
     at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
     at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
     at com.bea.core.repackaged.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
     at $Proxy170.calculateFreightCost(Unknown Source)
     at oracle.model.freightjb.CalculateFreight_5vfuh6_WSOImpl.__WL_calculateFreightCost_WS(CalculateFreight_5vfuh6_WSOImpl.java:72)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
I tried to modify abit the code as i changed the web method parameter from object (BatchOrder order) to variables(eg. int) and it works. When I test the Web Services I need to select the include checkbox den it works nicely else i will also encounter this problem. Does this mean the web services can not take it object as parameter?

Hi Paolo,
maybe I faced the same issue. I solved it reading the thread:
web service deployable client
Hope this help
Cheers
Roberto

Oracle web services or WebLogic web services ?

On " Oracle® Fusion Middleware Introducing Web Services" I read that on Oracle Fusion Middleware 11g platform there are 2 type of web services :
1) SOA, ADF, and WebCenter services
2) WebLogic Web services (Java EE Web services)
But what is the difference ? both web services aren't based on java specification ? why there is the distinction ?
Anyone can help me ?
Edited by: kronos72it on Nov 18, 2009 4:43 AM

It depends what you intend to do. The Oracle WebServices stack adds dynamics (needed for BPEL, etc.) and the OWSM security interceptors to the stack. Both have different security policy models and are not interoperable in this sense. I would go for the Oracle stack as the OWSM security is much easier to administer...
--olaf

Web Service Consumption in Web Dynpro Java

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