none: bpel fault handling

Understanding fault handling mechanism of bpel took time for me, so lets note down the issue..

i want to explain bpel fault handling in 2 steps.. In step 1, there is a bpel process which does nothing except for throwing an exception. In step 2, there is a sample web service throwing a user defined exception and bpel catches and throws that exception..

Process without web service :

Here are the files for the bpel module:

FaultWsdl.wsdl

<?xml version="1.0" encoding="UTF-8"?>

<definitions name="wsdl" targetNamespace="http://j2ee.netbeans.org/wsdl/wsdl"

xmlns="http://schemas.xmlsoap.org/wsdl/"

xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"

xmlns:xsd="http://www.w3.org/2001/XMLSchema"

xmlns:tns="http://j2ee.netbeans.org/wsdl/wsdl"

xmlns:plnk="http://docs.oasis-open.org/wsbpel/2.0/plnktype"

xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:ns0="http://xml.netbeans.org/schema/schema">

<types>

<xsd:schema targetNamespace="http://j2ee.netbeans.org/wsdl/wsdl">

<xsd:import schemaLocation="schema.xsd" namespace="http://xml.netbeans.org/schema/schema"/>

</xsd:schema>

</types>

</message>

</message>

</message>

</operation>

</portType>

<soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>

<soap:operation/>

<soap:body use="literal" namespace="http://j2ee.netbeans.org/wsdl/wsdl"/>

</input>

<soap:body use="literal" namespace="http://j2ee.netbeans.org/wsdl/wsdl"/>

</output>

<soap:fault use="literal" name="fault1" namespace="http://j2ee.netbeans.org/wsdl/wsdl"/>

</fault>

</operation>

</binding>

<soap:address location="http://localhost:${HttpDefaultPort}/wsdlService/wsdlPort"/>

</port>

</service>

<plnk:partnerLinkType name="wsdl">

<!-- A partner link type is automatically generated when a new port type is added. Partner link types are used by BPEL processes.

In a BPEL process, a partner link represents the interaction between the BPEL process and a partner service. Each partner link is associated with a partner link type.

A partner link type characterizes the conversational relationship between two services. The partner link type can have one or two roles.-->

<plnk:role name="wsdlPortTypeRole" portType="tns:wsdlPortType"/>

</plnk:partnerLinkType>

</definitions>

schema.xsd i think jaxws wants the schema in a seperate file than the wsdl, at least netbeans web service client generation wizard does!

<?xml version="1.0" encoding="UTF-8"?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"

targetNamespace="http://xml.netbeans.org/schema/schema"

xmlns:tns="http://xml.netbeans.org/schema/schema"

elementFormDefault="qualified">

<xsd:element name="faultstr" type="xsd:string"></xsd:element>

</xsd:schema>

FaultProcess.bpel

<?xml version="1.0" encoding="UTF-8"?>

<process

name="FaultProcess"

targetNamespace="http://enterprise.netbeans.org/bpel/BpelFault1/Process1"

xmlns="http://docs.oasis-open.org/wsbpel/2.0/process/executable"

xmlns:xsd="http://www.w3.org/2001/XMLSchema"

xmlns:sxt="http://www.sun.com/wsbpel/2.0/process/executable/SUNExtension/Trace"

xmlns:sxed="http://www.sun.com/wsbpel/2.0/process/executable/SUNExtension/Editor"

xmlns:tns="http://enterprise.netbeans.org/bpel/BpelFault1/Process1">

</partnerLinks>

</variables>

<copy>

<from>'This error is thrown from the bpel process'</from>

</copy>

<copy>

</copy>

</assign>

</sequence>

</process>

and offcourse the client call code:

try {

org.netbeans.j2ee.wsdl.wsdl.WsdlService service = new org.netbeans.j2ee.wsdl.wsdl.WsdlService();

org.netbeans.j2ee.wsdl.wsdl.WsdlPortType port = service.getWsdlPort();

javax.xml.ws.Holder part1 = new javax.xml.ws.Holder();

part1.value = new String("test");

port.wsdlOperation(part1);

} catch (org.netbeans.j2ee.wsdl.wsdl.WsdlOperationFault ex) {

System.out.println("fault: " + ex.getFaultInfo() );

}

The expected output is :

fault: This error is thrown from the bpel process

and done :) However, when web service thrown exceptions are considered, not so easy :(

Process catching exception thrown by invoked web service:

The sample web service:

MyWebService.java

package ws;

import javax.jws.WebMethod;

import javax.jws.WebParam;

import javax.jws.WebService;

@WebService()

public class MyWebService {

@WebMethod(operationName = "operation")

public String operation(@WebParam(name = "parameter")

String parameter) throws MyException {

throw new MyException("Exception thrown from web service :) ");

}

and the exception class..

MyException.java

package ws;

public class MyException extends Exception {

private String errorCode;

public MyException() {

}

public MyException(String msg) {

super(msg);

}

public String getErrorCode() {

return errorCode;

}

public void setErrorCode(String errorCode) {

this.errorCode = errorCode;

}

Now the bpel module files:

FaultCatchProcess.bpel

<?xml version="1.0" encoding="UTF-8"?>

<process

name="FaultCatchProcess"

targetNamespace="http://enterprise.netbeans.org/bpel/BpelFault2/FaultCatchProcess"

xmlns="http://docs.oasis-open.org/wsbpel/2.0/process/executable"

xmlns:xsd="http://www.w3.org/2001/XMLSchema"

xmlns:sxt="http://www.sun.com/wsbpel/2.0/process/executable/SUNExtension/Trace"

xmlns:sxed="http://www.sun.com/wsbpel/2.0/process/executable/SUNExtension/Editor"

xmlns:tns="http://enterprise.netbeans.org/bpel/BpelFault2/FaultCatchProcess" xmlns:ns0="http://ws/">

</partnerLinks>

</variables>

<copy>

</copy>

</assign>

</sequence>

</catch>

</faultHandlers>

<copy>

</copy>

</assign>

<copy>

</copy>

</assign>

</sequence>

</process>

FaultCatchWsdl.wsdl

<?xml version="1.0" encoding="UTF-8"?>

<definitions name="FaultCatchWsdl" targetNamespace="http://j2ee.netbeans.org/wsdl/FaultCatchWsdl"

xmlns="http://schemas.xmlsoap.org/wsdl/"

xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"

xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://j2ee.netbeans.org/wsdl/FaultCatchWsdl" xmlns:ns="http://ws/" xmlns:plnk="http://docs.oasis-open.org/wsbpel/2.0/plnktype" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/">

<types>

<xsd:schema targetNamespace="http://j2ee.netbeans.org/wsdl/FaultCatchWsdl">

<xsd:import namespace="http://ws/" schemaLocation="MyWebServiceService.xsd"/>

</xsd:schema>

</types>

</message>

</message>

</message>

</operation>

</portType>

<soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>

<soap:operation/>

<soap:body use="literal" namespace="http://j2ee.netbeans.org/wsdl/FaultCatchWsdl"/>

</input>

<soap:body use="literal" namespace="http://j2ee.netbeans.org/wsdl/FaultCatchWsdl"/>

</output>

<soap:fault use="literal" name="fault1" namespace="http://j2ee.netbeans.org/wsdl/FaultCatchWsdl"/>

</fault>

</operation>

</binding>

<soap:address location="http://localhost:${HttpDefaultPort}/FaultCatchWsdlService/FaultCatchWsdlPort"/>

</port>

</service>

<plnk:partnerLinkType name="FaultCatchWsdl">

<!-- A partner link type is automatically generated when a new port type is added. Partner link types are used by BPEL processes.

In a BPEL process, a partner link represents the interaction between the BPEL process and a partner service. Each partner link is associated with a partner link type.

A partner link type characterizes the conversational relationship between two services. The partner link type can have one or two roles.-->

<plnk:role name="FaultCatchWsdlPortTypeRole" portType="tns:FaultCatchWsdlPortType"/>

</plnk:partnerLinkType>

</definitions>

The following wsdl and xsd are local copies for the web service wsdl..

MyWebServiceService.wsdl

<?xml version="1.0" encoding="UTF-8"?>

<types>

<xsd:schema>

<xsd:import namespace="http://ws/" schemaLocation="MyWebServiceService.xsd"></xsd:import>

</xsd:schema>

</types>

</message>

</message>

</message>

</operation>

</portType>

<soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document"></soap:binding>

<soap:operation soapAction=""></soap:operation>

<input>

<soap:body use="literal"></soap:body>

</input>

<soap:body use="literal"></soap:body>

</output>

<soap:fault name="MyException" use="literal"></soap:fault>

</fault>

</operation>

</binding>

<soap:address location="http://localhost:8080/BpelFaultWS1/MyWebServiceService"></soap:address>

</port>

</service>

</definitions>

MyWebServiceService.xsd

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:tns="http://ws/" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="1.0" targetNamespace="http://ws/">

<xs:element name="MyException" type="tns:MyException"></xs:element>

<xs:element name="operation" type="tns:operation"></xs:element>

<xs:element name="operationResponse" type="tns:operationResponse"></xs:element>

<xs:complexType name="operation">

<xs:sequence>

<xs:element name="parameter" type="xs:string" minOccurs="0"></xs:element>

</xs:sequence>

</xs:complexType>

<xs:complexType name="operationResponse">

<xs:sequence>

<xs:element name="return" type="xs:string" minOccurs="0"></xs:element>

</xs:sequence>

</xs:complexType>

<xs:complexType name="MyException">

<xs:sequence>

<xs:element name="errorCode" type="xs:string" minOccurs="0"></xs:element>

<xs:element name="message" type="xs:string" minOccurs="0"></xs:element>

</xs:sequence>

</xs:complexType>

</xs:schema>

MyWebServiceServiceWrapper.wsdl

<?xml version="1.0" encoding="UTF-8"?>

<definitions

xmlns="http://schemas.xmlsoap.org/wsdl/"

xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"

xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"

xmlns:xsd="http://www.w3.org/2001/XMLSchema" name="MyWebServiceServiceWrapper" targetNamespace="http://enterprise.netbeans.org/bpel/MyWebServiceServiceWrapper" xmlns:tns="http://enterprise.netbeans.org/bpel/MyWebServiceServiceWrapper" xmlns:plnk="http://docs.oasis-open.org/wsbpel/2.0/plnktype" xmlns:ns="http://ws/">

<plnk:partnerLinkType name="MyWebServiceLinkType">

<plnk:role name="MyWebServiceRole" portType="ns:MyWebService"/>

</plnk:partnerLinkType>

</definitions>

However, i think there is a bug here when bpel called from a java or web client.. Yes, the exception thrown by the web service is caught properly, but the detail info just disappears :( While testing via test module of the composite app, there is not such bug..

Here is the test with xml:

input

<soapenv:Envelope xsi:schemaLocation="http://schemas.xmlsoap.org/soap/envelope/ http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:faul="http://j2ee.netbeans.org/wsdl/FaultCatchWsdl">

<soapenv:Body>

<faul:FaultCatchWsdlOperation>

<part1>

</part1>

</faul:FaultCatchWsdlOperation>

</soapenv:Body>

</soapenv:Envelope>

output

<?xml version="1.0" encoding="UTF-8"?>

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://schemas.xmlsoap.org/soap/envelope/ http://schemas.xmlsoap.org/soap/envelope/">

<SOAP-ENV:Body>

<SOAP-ENV:Fault>

<faultcode xmlns="">SOAP-ENV:Client</faultcode>

<faultstring xmlns="">fault1</faultstring>

<message>Exception thrown from web service :) </message>

</MyException>

</detail>

</SOAP-ENV:Fault>

</SOAP-ENV:Body>

</SOAP-ENV:Envelope>

here the client call:

try {

org.netbeans.j2ee.wsdl.faultcatchwsdl.FaultCatchWsdlService service = new org.netbeans.j2ee.wsdl.faultcatchwsdl.FaultCatchWsdlService();

org.netbeans.j2ee.wsdl.faultcatchwsdl.FaultCatchWsdlPortType port = service.getFaultCatchWsdlPort();

ws.Operation part1 = new ws.Operation();

part1.setParameter("test");

ws.OperationResponse result = port.faultCatchWsdlOperation(part1);

System.out.println("Result = "+result);

} catch (org.netbeans.j2ee.wsdl.faultcatchwsdl.FaultCatchWsdlOperationFault ex) {

System.out.println("My exception is : " + ex.getFaultInfo().getMessage());

}

and the output:

My exception is : null

PS: i wrote down whole files to make trying the code easier..

You know, most portions of the files are automatically generated..

Btw, my ide is Netbeans 6.5 and i deploy to glassfish v2, and i use openesb for bpel..

Ooohh, done finally :)

Edit on 03/09/2009, 12:07 : The format of the post was a mess, so it is fixed by now..
The next post is about the bug mentioned here (in red)..

none

1 Eylül 2009 Salı

bpel fault handling

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