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Editorial Team
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Asked: 2026-05-31T20:53:42+00:00

I have setup BPS and have created a few BPEL processes which i can

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I have setup BPS and have created a few BPEL processes which i can use to invoke services on the Application Server. I have created a REST proxy service on the ESB which uses an endpoint to a Labview server. In Labview i have a very basic REST service which generates a random value every second. I can access the REST service as follows http://localhost:8000/Maths/random. This generates the follwing output with a random value

RValue:19.000000

I have had success in accessing this service through the Gadget server and displaying the value as a graph using the WSO2 graphics framework.

But I am having problems when I try to invoke the same proxy service from a BPEL process. I have generated a wsdl file for the proxy service from the ESB. This wsdl file is used for the port connections etc. It only has one operation the “mediate” operation with no parameters or elements. I have followed a few of the tutorials for the BPS server to invoke the service but i have had no success so far.
Can anyone show me how this can be done or point me to a similar tutorial?
Many thanks.

U Raza
below is the BPS error i get

[2012-03-15 18:22:33,265] INFO – BpelServerImpl – Registered process {http://areasearvice.bpel.bps}AreaService-14.
[2012-03-15 18:22:42,282] INFO – CarbonAuthenticationUtil – ‘admin’ logged in at [2012-03-15 18:22:42,0282] from IP address 143.53.207.235
[2012-03-15 18:23:09,041] ERROR – BpelObjectFactory$BOMSAXErrorHandler – null:file:///D:/ESB/WSO2/wso2bps-2.1.0/tmp/work/bpelTemp/1.33183578879275E12/BPELREST/RestfulProxy.bpel:88:56:cvc-complex-type.3.2.2: Attribute ‘xml:space’ is not allowed to appear in element ‘bpel:literal’.
[2012-03-15 18:23:09,043] WARN – BpelObjectFactory – Validation errors during parsing, continuing due to -Dorg.apache.ode.compiler.failOnValidationErrors=false switch
[2012-03-15 18:23:09,046] INFO – BpelC – info: [CompilingProcess] Compiling BPEL process.
[2012-03-15 18:23:09,116] INFO – WSDLRegistry – WSDL at file:/D:/ESB/WSO2/wso2bps-2.1.0/tmp/work/bpelTemp/1.33183578879275E12/BPELREST/GetLVRandomProxy.wsdl is a duplicate import, your documents should all be in different namespaces (its’s not nice but will still work).
[2012-03-15 18:23:09,116] INFO – WSDLRegistry – WSDL at file:/D:/ESB/WSO2/wso2bps-2.1.0/tmp/work/bpelTemp/1.33183578879275E12/BPELREST/GetLVRandomProxy.wsdl is already imported, this denotes a circular reference.
[2012-03-15 18:23:09,134] ERROR – BpelC – file:/D:/ESB/WSO2/wso2bps-2.1.0/tmp/work/bpelTemp/1.33183578879275E12/BPELREST/RestfulProxy.bpel:72: error: [CopyToMessageFromNonMessage] Copy to message variable RestProxyPLRequest requires a message for the r-value.
[2012-03-15 18:23:09,139] ERROR – BpelC – file:/D:/ESB/WSO2/wso2bps-2.1.0/tmp/work/bpelTemp/1.33183578879275E12/BPELREST/RestfulProxy.bpel:95: error: [CopyFromMessageToNonMessage] Copy from message variable RestProxyPLResponse requires a message for the l-value.
[2012-03-15 18:23:09,143] ERROR – BPELUploadExecutor – BPEL Process Compilation Failure.
org.apache.ode.bpel.compiler.api.CompilationException: error: [CompilationErrors] Compilation completed with 2 error(s):
file:/D:/ESB/WSO2/wso2bps-2.1.0/tmp/work/bpelTemp/1.33183578879275E12/BPELREST/RestfulProxy.bpel:72: error: [CopyToMessageFromNonMessage] Copy to message variable RestProxyPLRequest requires a message for the r-value.
file:/D:/ESB/WSO2/wso2bps-2.1.0/tmp/work/bpelTemp/1.33183578879275E12/BPELREST/RestfulProxy.bpel:95: error: [CopyFromMessageToNonMessage] Copy from message variable RestProxyPLResponse requires a message for the l-value.
at org.apache.ode.bpel.compiler.BpelCompiler.compile(BpelCompiler.java:815)
at org.apache.ode.bpel.compiler.BpelC.compile(BpelC.java:278)
at org.apache.ode.bpel.compiler.BpelC.compile(BpelC.java:364)
at org.apache.ode.store.DeploymentUnitDir$5.run(DeploymentUnitDir.java:213)
at org.apache.ode.utils.InternPool.runBlock(InternPool.java:57)
at org.apache.ode.store.DeploymentUnitDir.compile(DeploymentUnitDir.java:210)
at org.apache.ode.store.DeploymentUnitDir.compile(DeploymentUnitDir.java:169)
at org.wso2.carbon.bpel.ui.fileupload.BPELUploadExecutor.validateBPELPackage(BPELUploadExecutor.java:262)
at org.wso2.carbon.bpel.ui.fileupload.BPELUploadExecutor.execute(BPELUploadExecutor.java:101)
at org.wso2.carbon.ui.transports.fileupload.AbstractFileUploadExecutor.executeGeneric(AbstractFileUploadExecutor.java:105)
at org.wso2.carbon.ui.transports.fileupload.FileUploadExecutorManager$CarbonXmlFileUploadExecHandler.execute(FileUploadExecutorManager.java:392)
at org.wso2.carbon.ui.transports.fileupload.FileUploadExecutorManager$FileUploadExecutionHandlerManager.startExec(FileUploadExecutorManager.java:276)
at org.wso2.carbon.ui.transports.fileupload.FileUploadExecutorManager.execute(FileUploadExecutorManager.java:125)
at org.wso2.carbon.ui.transports.FileUploadServlet.doPost(FileUploadServlet.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.eclipse.equinox.http.helper.ContextPathServletAdaptor.service(ContextPathServletAdaptor.java:36)
at org.eclipse.equinox.http.servlet.internal.ServletRegistration.handleRequest(ServletRegistration.java:90)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:111)
at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:67)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.wso2.carbon.bridge.BridgeServlet.service(BridgeServlet.java:155)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.wso2.carbon.server.TomcatServer$1.invoke(TomcatServer.java:241)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:396)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:356)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1534)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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1 Answer

  1. Editorial Team

    I tried this and here I have provided a BPEL sample to invoke the following proxy service. Please find the sample artifacts from here.
    Note – You have to get a api key from goodreads and replace with MyKeyHere.

    <proxy name="GetProxy" transports="https http" startOnLoad="true" trace="disable">
        <target>
            <inSequence>
                <log level="full"/>
                <property name="HTTP_METHOD" value="GET" scope="axis2"/>
                <property name="REST_URL_POSTFIX" value="/4776766.xml?key=MyKeyHere" scope="axis2"/>
                <send>
                    <endpoint>
                        <address uri="http://www.goodreads.com/author/list"/>
                    </endpoint>
                </send>
            </inSequence>
            <outSequence>
                <send/>
            </outSequence>
        </target>
    </proxy>
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