Problem with a java SQL UDF

Folks:

A co-worker of mine is trying to setup a Java user defined function in DB2/400 ... but we can't get it to work.

The function is very simple ...

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import COM.ibm.db2.app.UDF;
import COM.ibm.db2.app.Clob;
import java.io.Reader;

public class Functions3DB2 extends UDF {

public void testFunc3(int b, int a, int res) throws Exception
{
int blah = b+a;
set(3,blah*2);
}
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After copying the jar containing the class to the /tmp ifs directory we installed it, into schema kmorton3, using the following SQL commands ...

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- call sqlj.install_jar('file:/tmp/kev3.jar','kmorton3.mksis3',0)
- create function testFunc3(b int, a int) returns int
specific testFunc3
deterministic
language java
parameter style db2general
no dbinfo
fenced
returns null on null input
external name 'mksis3:mks.ci.server.schema.Functions3DB2!testFunc3'

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When we try to run the function, we get the following error ...

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select testFunc3(1,2) from fields where ID=-1

[SQL4306] Java stored procedure or user-defined function TESTFUNC3, specific name TESTFUNC3 could not call Java method testFunc3, signature (III)V. Cause . . . . . : The Java method given by the EXTERNAL NAME clause of a CREATE PROCEDURE or CREATE FUNCTION statement could not be found. Its declared argument list may not match what the database expects, or it may not be a "public" instance method. Recovery . . . : Ensure that a Java instance method exists with the "public" flag and the expected argument list for this call.
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I'm not super familiar with UDF's ... can anyone help out here?

Is the function being created correctly in SQL?

Is the java method's signature correct?

Thanks!

david