Using a Java enum type in a JAX-RS matrix parameter results in a
StackOverflowError when generating the WADL
------------------------------------------------------------------------------------------------------------
Key: CXF-2908
URL: https://issues.apache.org/jira/browse/CXF-2908
Project: CXF
Issue Type: Bug
Components: JAX-RS
Affects Versions: 2.2.9
Environment: Windows XP, Tomcat 6.0.20, JDK 1.6.0_19
Reporter: Greg Katz
*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}}.
{noformat}
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)
...
{noformat}
*Example code:*
{code:java}
@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;
}
{code}
*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}}.
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