FULL PRODUCT VERSION :
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Confirmed under Windows Vista and 7 32bit, XP and 64bit untested

A DESCRIPTION OF THE PROBLEM :
XMLEncoder fails to encode a bean when it extends an interface with getters that have generic type.


REGRESSION. Last worked in version 7

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run the test case under java 7

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
output from java 6:

<?xml version="1.0" encoding="UTF-8"?>
<java version="1.6.0_22" class="java.beans.XMLDecoder">
 <object class="test.Test$WorkingBean">
  <void property="cod_id">
   <int>99</int>
  </void>
 </object>
 <object class="test.Test$BrokenBean">
  <void property="cod_id">
   <int>99</int>
  </void>
 </object>
</java>
ACTUAL -
cod_id doesn't get serialised
output from java 7:

java.lang.NoSuchMethodException: <unbound>=Test$BrokenBean.getCod_id();
Continuing ...
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.7.0" class="java.beans.XMLDecoder">
 <object class="test.Test$WorkingBean">
  <void property="cod_id">
   <int>99</int>
  </void>
 </object>
 <object class="test.Test$BrokenBean"/>
</java>


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NoSuchMethodException: <unbound>=Test$BrokenBean.getCod_id();
Continuing ...

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package test;

import java.beans.XMLEncoder;

public class Test {
public static class WorkingBean {
private Integer cod_id;

public WorkingBean() {

}

public Integer getCod_id() {
return cod_id;
}

public void setCod_id(Integer cod_id) {
this.cod_id = cod_id;
}
}


public static class BrokenBean implements WithCodId<Integer> {
protected Integer cod_id;

public BrokenBean() {

}

public Integer getCod_id() {
return cod_id;
}

public void setCod_id(Integer cod_id) {
this.cod_id = cod_id;
}
}

public static interface WithCodId<T extends Number> {
T getCod_id();
void setCod_id(T value);
}

public static void main(String[] args) {
WorkingBean b1 = new WorkingBean();
b1.setCod_id(99);

BrokenBean b2 = new BrokenBean();
b2.setCod_id(99);

XMLEncoder enc = new XMLEncoder(System.out);
enc.writeObject(b1);
enc.writeObject(b2);
enc.close();
}
}


---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Hardcode type in the WithCodId interface.