The fix is in CVS, as usual. So you have to get the 3,2 branch code. An easier solution is to wait for the first RC of JBoss 3.2.4 (which should be out soon), which will use Tomcat 5.0.19.
Alternatively you can do what I did last week which is to get the 3.2.3 source and build the fix yourself.
The change is to simply add a no-argument constructor to /varia/src/main/org/jboss/jmx/adaptor/control/OpResultInfo.java
After you've built it you can then update the class in deploy/jmx-console.war/WEB-INF/classes.