FULL PRODUCT VERSION :
java version "1.7.0_02"
Java(TM) SE Runtime Environment (build 1.7.0_02-b13)
Java HotSpot(TM) Client VM (build 22.0-b10, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Windows xp

A DESCRIPTION OF THE PROBLEM :
Running apt against two web service files, apt reported error like below:
-----------
error: Methods in an endpointInterface must be implemented in the implementation
 class. Interface Class:ReliableEchoPortType Implementation Class:ReliableEchoS
erviceImpl Method: echo(java.lang.String)
-----------

Based on my investigation, I think it is related with the fact that the class com.sun.tools.javac.code.Type$ClassType doesn't overwrite the method quals().

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Open a dos console, then running below steps(I also attached the command output). For the step 4, several sun standard jar files are required:

1) D:\public\apt_bug>echo %JAVA_HOME%
D:\depot090810\dev\src1212\build\jdk7_02\jdk1.7.0_02

2)D:\public\apt_bug>%JAVA_HOME%/bin/java -version
java version "1.7.0_02"
Java(TM) SE Runtime Environment (build 1.7.0_02-b13)
Java HotSpot(TM) Client VM (build 22.0-b10, mixed mode)

3)D:\public\apt_bug>%JAVA_HOME%/bin/javac -d ./ ReliableEchoPortType.java

4)D:\public\apt_bug>%JAVA_HOME%/bin/apt -sourcepath ./ -g -AdoNotOverWrite=true -A
ignoreNoWebServiceFoundWarning=true -proc:only ReliableEchoServiceImpl.java -pro
cessor com.sun.tools.ws.processor.modeler.annotation.WebServiceAp -classpath ./;
./lib/com.sun.xml.ws.jaxws-tools.jar;./lib/com.sun.xml.ws.jaxws-rt.jar;./lib/com
.sun.xml.bind.jaxb-xjc.jar;./lib/com.sun.xml.bind.jaxb-impl.jar

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Apt can process this file normally.
ACTUAL -
Apt reported a error:
error: Methods in an endpointInterface must be implemented in the implementation
 class. Interface Class:ReliableEchoPortType Implementation Class:ReliableEchoS
erviceImpl Method: echo(java.lang.String)
1 error

ERROR MESSAGES/STACK TRACES THAT OCCUR :
D:\public\apt_bug>%JAVA_HOME%/bin/apt -sourcepath ./ -g -AdoNotOverWrite=true -A
ignoreNoWebServiceFoundWarning=true -proc:only ReliableEchoServiceImpl.java -pro
cessor com.sun.tools.ws.processor.modeler.annotation.WebServiceAp -classpath ./;
./lib/com.sun.xml.ws.jaxws-tools.jar;./lib/com.sun.xml.ws.jaxws-rt.jar;./lib/com
.sun.xml.bind.jaxb-xjc.jar;./lib/com.sun.xml.bind.jaxb-impl.jar

warning: The apt tool and its associated API are planned to be
removed in the next major JDK release. These features have been
superseded by javac and the standardized annotation processing API,
javax.annotation.processing and javax.lang.model. Users are
recommended to migrate to the annotation processing features of
javac; see the javac man page for more information.
warning: Annotation types without processors: javax.xml.bind.annotation.XmlRootE
lement,javax.xml.bind.annotation.XmlAccessorType,javax.xml.bind.annotation.XmlTy
pe,javax.xml.bind.annotation.XmlElement
1 warning
warning: Supported source version 'RELEASE_6' from annotation processor 'com.sun
.tools.ws.processor.modeler.annotation.WebServiceAp' less than -source '1.7'
error: Methods in an endpointInterface must be implemented in the implementation
 class. Interface Class:ReliableEchoPortType Implementation Class:ReliableEchoS
erviceImpl Method: echo(java.lang.String)
1 error
1 warning

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
1) ReliableEchoServiceImpl.java

package mc.wsrm;

import javax.jws.WebService;

@WebService(portName = "ReliableEchoPort",
            serviceName = "ReliableEchoService",
            targetNamespace = "http://wsrm.mc/",
            endpointInterface = "mc.wsrm.ReliableEchoPortType",
            wsdlLocation = "/wsdls/ReliableEcho.wsdl"
            )
//@Policy(uri="policy:DefaultReliability1.1")
public class ReliableEchoServiceImpl{

  public String echo(String msg) {
    System.out.println("%% Echoing: " + msg + " %%");

    return msg;
  }

  public void onewayOp(String msg) {
    System.out.println("%% Oneway Op: " + msg + " %%");
  }
  
}

2) ReliableEchoPortType.java

package mc.wsrm;

import javax.jws.Oneway;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebResult;
import javax.jws.WebService;
import javax.xml.bind.annotation.XmlSeeAlso;
import javax.xml.ws.RequestWrapper;
import javax.xml.ws.ResponseWrapper;


/**
 * This class was generated by the JAX-WS RI.
 * JAX-WS RI 2.2.7b06
 * Generated source version: 2.2
 *
 */
@WebService(name = "ReliableEchoPortType", targetNamespace = "http://wsrm.mc/")
public interface ReliableEchoPortType {


    /**
     *
     * @param arg0
     * @return
     * returns java.lang.String
     */
    @WebMethod
    @WebResult(targetNamespace = "")
    @RequestWrapper(localName = "echo", targetNamespace = "http://wsrm.mc/", className = "mc.wsrm.Echo")
    @ResponseWrapper(localName = "echoResponse", targetNamespace = "http://wsrm.mc/", className = "mc.wsrm.EchoResponse")
    public String echo(
        @WebParam(name = "arg0", targetNamespace = "")
        String arg0);

    /**
     *
     * @param arg0
     */
    @WebMethod
    @Oneway
    @RequestWrapper(localName = "onewayOp", targetNamespace = "http://wsrm.mc/", className = "mc.wsrm.OnewayOp")
    public void onewayOp(
        @WebParam(name = "arg0", targetNamespace = "")
        String arg0);

}

3) And several standand jar files shown in the command, which are required when running apt: com.sun.xml.bind.jaxb-impl.jar, com.sun.xml.bind.jaxb-xjc.jar, com.sun.xml.ws.jaxws-rt.jar, com.sun.xml.ws.jaxws-tools.jar,
---------- END SOURCE ----------