使用XSOMParser错误进行WSDL解析

Question

我有一个WSDL文件，我正在使用XSOMParser来解析文件。但它给了一些例外。

我的代码是：

private void initXsom() throws IOException {
        try {
            SchemaImpl schema = (SchemaImpl) wsdlObject.getTypes()
                    .getExtensibilityElements().get(0);

            Element el = schema.getElement();
            InputStream is = prepareSchema(el);

            XSOMParser parser = new XSOMParser();

            // is needed to read element documentations which are inside
            // annotations
            parser.setAnnotationParser(new AnnotationFactory());

            parser.parse(is);

            String targetNamespace = wsdlObject.getTargetNamespace();
            if (parser.getResult() == null)
                throw new IOException(
                        "Could not initialize XML Schema");
            schemaObject = parser.getResult().getSchema(targetNamespace);

            addSchemaElements();

        } catch (TransformerException | SAXException e) {
            throw new IOException("Problem initializing XML Schema.", e);
        }

    }

它给了我例外：

Exception in thread "main" java.io.IOException: Problem initializing XML Schema.
    at eu.impact_project.iif.ws.generic.WsdlDocument.initXsom(WsdlDocument.java:170)
    at eu.impact_project.iif.ws.generic.WsdlDocument.<init>(WsdlDocument.java:105)
    at eu.impact_project.iif.ws.generic.SoapService.<init>(SoapService.java:57)
    at eu.impact_project.iif.ws.generic.SoapService.<init>(SoapService.java:47)
    at soapUi.mainClass.main(mainClass.java:20)
Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Premature end of file.
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)
    at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
    at com.sun.xml.xsom.parser.JAXPParser.parse(JAXPParser.java:79)
    at com.sun.xml.xsom.impl.parser.NGCCRuntimeEx.parseEntity(NGCCRuntimeEx.java:298)
    at com.sun.xml.xsom.impl.parser.ParserContext.parse(ParserContext.java:87)
    at com.sun.xml.xsom.parser.XSOMParser.parse(XSOMParser.java:147)
    at com.sun.xml.xsom.parser.XSOMParser.parse(XSOMParser.java:102)
    at eu.impact_project.iif.ws.generic.WsdlDocument.initXsom(WsdlDocument.java:158)

任何人都可以帮助我解决这个问题。 感谢