I've managed to get this working, debugging through the jaxb code. The
problem is that it needs to re-use the Reader, but it calls close(),
which on StringReader sets the str member to null or closes the
InputStream on InputStream reader. To get around this I extended
StringReader and override the close() method to call reset() instead.
Mark
Mark Proctor wrote:
> I'm trying to get XJC to generate the src code for an XSD model at
> runtime using the XJC api, using just input streams as we don't want
> disk access. This is to facilite the data loading of XSD based models
> into Drools at runtime. We will compile the src at runtime using an
> embedded compiler and add it to the Drools classloader. I've already
> done something similar for a Smooks data loadaer
> http://blog.athico.com/2008/07/drools-smooks-data-loader.html. I've
> looked over the maven plugin for XJC, changing it from a File based
> utility to InputStreams, although now stuck. I've included the test
> code below, along with the error and the xsd. If anyone can help, or
> point me to some code that already does this, would be very much
> appreciated.
>
> Thanks
>
> Mark
>
> --------The Test-------------
> test1() throws Exception {
> Options xjcOpts = new Options();
> xjcOpts.setSchemaLanguage( Language.XMLSCHEMA );
> InputStream stream = getClass().getResourceAsStream( "test.xsd" );
> assertNotNull( stream ); InputSource source = new InputSource( new
> InputStreamReader( stream ) );
>
> source.setSystemId( ".xsd" );
> xjcOpts.addGrammar( source );
> ErrorReceiver errorReceiver = new JaxbErrorReceiver4Drools();
> Model model = ModelLoader.load( xjcOpts, new JCodeModel(),
> errorReceiver); final Outline outline =
> model.generateCode(xjcOpts, errorReceiver);
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> model.codeModel.build( xjcOpts.createCodeWriter( new
> SingleStreamCodeWriter( baos ) ) ); String str = new String(
> baos.toByteArray() );
> System.out.println( str ); }
>
> public class JaxbErrorReceiver4Drools extends ErrorReceiver {
> public String stage = "processing";
>
> public void warning(SAXParseException e) {
> e.printStackTrace();
> }
>
> public void error(SAXParseException e) {
> e.printStackTrace();
> }
>
> public void fatalError(SAXParseException e) {
> e.printStackTrace();
> }
>
> public void info(SAXParseException e) {
> e.printStackTrace();
> }
> }
>
> -------------The Error----------------
> java.io.IOException: Stream closed
> at
> com.sun.xml.xsom.impl.parser.NGCCRuntimeEx.parseEntity(NGCCRuntimeEx.java:305)
> at
> com.sun.xml.xsom.impl.parser.ParserContext.parse(ParserContext.java:88)
> at com.sun.xml.xsom.parser.XSOMParser.parse(XSOMParser.java:147)
> at
> com.sun.tools.xjc.ModelLoader.createXSOMSpeculative(ModelLoader.java:496)
> at com.sun.tools.xjc.ModelLoader.loadXMLSchema(ModelLoader.java:366)
> at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:167)
> at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:113)
> at
> org.drools.dataloaders.jaxb.DroolsJaxbTest.test1(DroolsJaxbTest.java:36)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at junit.framework.TestCase.runTest(TestCase.java:154)
> at junit.framework.TestCase.runBare(TestCase.java:127)
> at junit.framework.TestResult$1.protect(TestResult.java:106)
> at junit.framework.TestResult.runProtected(TestResult.java:124)
> at junit.framework.TestResult.run(TestResult.java:109)
> at junit.framework.TestCase.run(TestCase.java:118)
> at junit.framework.TestSuite.runTest(TestSuite.java:208)
> at junit.framework.TestSuite.run(TestSuite.java:203)
> at
> org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
> at
> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
>
>
> -----------The test.xsd file-----------
> schema xmlns = "http://www.w3.org/2001/XMLSchema";
> xmlns:exp="http://www.oracle.com/sample3/";
> targetNamespace="http://www.oracle.com/sample3/";
> elementFormDefault="qualified">
>
> <complexType name="Address">
> <sequence>
> <element name="name" type="string"/>
> <element name="doorNumber" type="short"/>
> <element name="street" type="string"/>
> <element name="city" type="string"/>
> </sequence>
> </complexType>
>
> <complexType name="USAddress">
> <complexContent>
> <extension base="exp:Address">
> <sequence>
> <element name="state" type="string"/>
> <element name="zip" type="integer"/>
> <element name="country" type="string"/>
> </sequence>
> </extension>
> </complexContent>
> </complexType>
>
> <element name="myAddress" type="exp:USAddress"/>
>
> </schema>
>
>
>
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