JAXBContext.newInstance(Class<?>) throws "JAXBException: Package java.lang with JAXB class xxx defined in a module java.base must be open to at least java.xml.bind module" if the class is in java.lang package

[LanceAndersen]

Previously tracked via: https://bugs.openjdk.java.net/browse/JDK-8184726

Run the following java program:

import java.io.StringReader;

import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBElement; import javax.xml.bind.Marshaller; import javax.xml.bind.Unmarshaller; import javax.xml.namespace.QName; import javax.xml.transform.stream.StreamSource;

public class TestJAXB {

public static void main(String[] args) throws Exception { 
    // marshal 
    int[] x = new int[]{1,5,2,3,4}; 
    JAXBElement<int[]> xe = new JAXBElement<int[]>(new QName("", "root"), int[].class, JAXBElement.GlobalScope.class, x); 
    Marshaller m = JAXBContext.newInstance(int[].class).createMarshaller(); 
    m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true); 
    m.marshal(xe,System.out); 

    // unmarshal 
    Unmarshaller u = JAXBContext.newInstance(int[].class).createUnmarshaller(); 
    JAXBElement e = u.unmarshal(new StreamSource(new StringReader( 
            "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n" + 
            "<root>\n" + 
            " <item>1</item>\n" + 
            " <item>5</item>\n" + 
            " <item>2</item>\n" + 
            " <item>3</item>\n" + 
            " <item>4</item>\n" + 
            "</root>\n")), int[].class); 
} 

}

Exception in thread "main" javax.xml.bind.JAXBException: Package java.lang with JAXB class [I defined in a module java.base must be open to at least java.xml.bind module. at java.xml.bind@9/javax.xml.bind.ModuleUtil.delegateAddOpensToImplModule(ModuleUtil.java:148) at java.xml.bind@9/javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:285) at java.xml.bind@9/javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:270) at java.xml.bind@9/javax.xml.bind.ContextFinder.find(ContextFinder.java:407) at java.xml.bind@9/javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:706) at java.xml.bind@9/javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:647) at TestJAXB.main(TestJAXB.java:16)

Please note, the exception is thrown in JAXBContext.newInstance(int[].class), other code is just to show a whole example.

[lukaseder]

I'm also running into this when unit testing https://github.com/jOOQ/jOOX. Adding

    opens org.joox to java.xml.bind;

To the module-info.java seems to work, but this shouldn't be required IMO.