WSDL/xml interface referring to wsdl with XSD imports that cannot be resolved 
throws nullpointer
------------------------------------------------------------------------------------------------

                 Key: TUSCANY-2050
                 URL: https://issues.apache.org/jira/browse/TUSCANY-2050
             Project: Tuscany
          Issue Type: Bug
          Components: Java SCA Core Runtime
    Affects Versions: Java-SCA-1.1
            Reporter: clemens utschig
            Priority: Critical
             Fix For: Java-SCA-1.2


having a wsdl interface, that points to a valid wsdl which contains XML schema 
imports that cannot be resolved throws nullpointer.

Caused by: java.lang.RuntimeException: java.lang.NullPointerException
        at 
org.apache.ws.commons.schema.SchemaBuilder.resolveXmlSchema(SchemaBuilder.java:1886)
        at 
org.apache.ws.commons.schema.SchemaBuilder.handleImport(SchemaBuilder.java:1620)
        at 
org.apache.ws.commons.schema.SchemaBuilder.handleXmlSchemaElement(SchemaBuilder.java:175)
        at 
org.apache.ws.commons.schema.SchemaBuilder.build(SchemaBuilder.java:82)
        at 
org.apache.ws.commons.schema.XmlSchemaCollection.read(XmlSchemaCollection.java:359)
        at 
org.apache.ws.commons.schema.XmlSchemaCollection.read(XmlSchemaCollection.java:353)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.XSDModelResolver.loadOnDemand(XSDModelResolver.java:143)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.XSDModelResolver.aggregate(XSDModelResolver.java:173)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.XSDModelResolver.resolveModel(XSDModelResolver.java:104)
        at 
org.apache.tuscany.sca.contribution.resolver.ExtensibleModelResolver.resolveModel(ExtensibleModelResolver.java:127)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLModelResolver.readInlineSchemas(WSDLModelResolver.java:389)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLModelResolver.loadDefinition(WSDLModelResolver.java:323)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLModelResolver.loadOnDemand(WSDLModelResolver.java:288)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLModelResolver.aggregate(WSDLModelResolver.java:223)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLModelResolver.resolveModel(WSDLModelResolver.java:256)
        at 
org.apache.tuscany.sca.contribution.resolver.ExtensibleModelResolver.resolveModel(ExtensibleModelResolver.java:127)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLInterfaceProcessor.resolveWSDLInterface(WSDLInterfaceProcessor.java:144)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLInterfaceProcessor.resolve(WSDLInterfaceProcessor.java:168)
        at 
org.apache.tuscany.sca.interfacedef.wsdl.xml.WSDLInterfaceProcessor.resolve(WSDLInterfaceProcessor.java:43)
        at 
org.apache.tuscany.sca.contribution.processor.DefaultStAXArtifactProcessorExtensionPoint$LazyStAXArtifactProcessor.resolve(DefaultStAXArtifactProcessorExtensionPoint.java:242)
        at 
org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor.resolve(ExtensibleStAXArtifactProcessor.java:108)
        at 
org.apache.tuscany.sca.assembly.xml.BaseAssemblyProcessor.resolveContracts(BaseAssemblyProcessor.java:290)
        at 
org.apache.tuscany.sca.assembly.xml.CompositeProcessor.resolve(CompositeProcessor.java:752)
        at 
org.apache.tuscany.sca.assembly.xml.CompositeProcessor.resolve(CompositeProcessor.java:74)
        at 
org.apache.tuscany.sca.contribution.processor.ExtensibleStAXArtifactProcessor.resolve(ExtensibleStAXArtifactProcessor.java:108)
        at 
org.apache.tuscany.sca.assembly.xml.CompositeDocumentProcessor.resolve(CompositeDocumentProcessor.java:113)
        at 
org.apache.tuscany.sca.assembly.xml.CompositeDocumentProcessor.resolve(CompositeDocumentProcessor.java:47)
        at 
org.apache.tuscany.sca.contribution.processor.ExtensibleURLArtifactProcessor.resolve(ExtensibleURLArtifactProcessor.java:86)
        at 
org.apache.tuscany.sca.contribution.service.impl.ContributionServiceImpl.processResolvePhase(ContributionServiceImpl.java:423)
        at 
org.apache.tuscany.sca.contribution.service.impl.ContributionServiceImpl.addContribution(ContributionServiceImpl.java:333)
        at 
org.apache.tuscany.sca.contribution.service.impl.ContributionServiceImpl.contribute(ContributionServiceImpl.java:155)
        at 
org.apache.tuscany.sca.host.embedded.impl.DefaultSCADomain.<init>(DefaultSCADomain.java:125)
        at 
org.apache.tuscany.sca.host.embedded.SCADomain.createNewInstance(SCADomain.java:230)
        ... 2 more
Caused by: java.lang.NullPointerException
        at 
org.apache.ws.commons.schema.SchemaBuilder.resolveXmlSchema(SchemaBuilder.java:1875)
        at 
org.apache.ws.commons.schema.SchemaBuilder.handleImport(SchemaBuilder.java:1620)
        at 
org.apache.ws.commons.schema.SchemaBuilder.handleXmlSchemaElement(SchemaBuilder.java:175)
        at 
org.apache.ws.commons.schema.SchemaBuilder.build(SchemaBuilder.java:82)
        at 
org.apache.ws.commons.schema.XmlSchemaCollection.read(XmlSchemaCollection.java:359)
        at 
org.apache.ws.commons.schema.XmlSchemaCollection.read(XmlSchemaCollection.java:304)
        at 
org.apache.ws.commons.schema.SchemaBuilder.resolveXmlSchema(SchemaBuilder.java:1884)
        ... 34 more


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