[CXF-2908] Using a Java enum type in a JAX-RS matrix parameter results in a StackOverflowError when generating the WADL

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.9
• Fix Version/s: 2.2.10, 2.3
• Component/s: JAX-RS

Environment

Windows XP, Tomcat 6.0.20, JDK 1.6.0_19

• Assignee: Sergey Beryozkin
• Reporter: Greg Katz
• Created: 23/Jul/10 19:09
• Updated: 11/Oct/10 14:45
• Resolved: 26/Jul/10 21:49

Description

Repro steps:

1. Create a JAX-RS endpoint method that uses an object with an enum-typed property as a matrix parameter.
2. Hit the WADL URI for the endpoint's path (or "above" the endpoint's path). Something like http://host:port/rest?_wadl, in other words.

Result:

The org.apache.cxf.jaxrs.model.wadl.WadlGenerator throws a StackOverflowError.

ERROR 2010-07-23 09:45:09.417 http-8080-1>  Servlet.service() for servlet CXFServlet threw exception
java.lang.StackOverflowError
        at java.lang.Class.privateGetPublicMethods(Class.java:2536)
        at java.lang.Class.getMethods(Class.java:1410)
        at org.apache.cxf.jaxrs.utils.InjectionUtils.getParametersFromBeanClass(InjectionUtils.java:853)
        at org.apache.cxf.jaxrs.model.wadl.WadlGenerator.doWriteBeanParam(WadlGenerator.java:447)
        at org.apache.cxf.jaxrs.model.wadl.WadlGenerator.doWriteBeanParam(WadlGenerator.java:456)
        at org.apache.cxf.jaxrs.model.wadl.WadlGenerator.doWriteBeanParam(WadlGenerator.java:456)
        at org.apache.cxf.jaxrs.model.wadl.WadlGenerator.doWriteBeanParam(WadlGenerator.java:456)
        at org.apache.cxf.jaxrs.model.wadl.WadlGenerator.doWriteBeanParam(WadlGenerator.java:456)
        ...

Example code:

@Path("/whatever")
@Produces("application/json")
public interface WhateverEndpoint {
    
    @GET
    @Path("/")
    public Whatever[] getWhatevers(@MatrixParam("")WhateverSearchCriteria criteria);

}

@XmlRootElement
public class WhateverSearchCriteria {

    private EnumType enumValue;

    public EnumType getEnumValue() {
        return enumValue;
    }

}

@XmlRootElement
public enum EnumType {

    Value1,
    Value2;

}

Observations:

When I commented out the enum-typed property, the StackOverflowError went away.

I stepped through the WadlGenerator in the debugger and noticed something about getParametersFromBeanClass that might be the source of the problem. getParametersFromBeanClass gets all of the no-arg methods that begin with get and then discards "getClass". However, it doesn't discard the Enum class's getDeclaringClass method. This method returns an object of type java.lang.Class. In the debugger, I saw that all of the remaining doWriteBeanParam stack frames after the one whose type argument was the enum type had a type argument of java.lang.Class.