Error while calling java from RPG Java exception "java.lang.UnknownError:"

Hi
I am using V5R2 and JDK1.4.1
and calling Java from RPG, and having a weird problem
Every thing works when i call this RPG program first
time, but when i call the RPG program second time i
get
error saying

Message ID . . . . . . :   RNQ0301       Severity . .
. . . . . :   99         
 Message type . . . . . :   Inquiry                   
                         
 Date sent  . . . . . . :   01/19/04      Time sent  .
. . . . . :   10:54:23   
                                                      
                         
 Message . . . . :   Java exception received when
calling Java method (C G D    
   F).                                                
                         
 Cause . . . . . :   RPG procedure PU610B01 in program
CXSXA/PU610B received    
   Java exception "java.lang.UnknownError:" when
calling method "<init>" with   
   signature "(Ljava.lang.String;)V" in class         
                         
   "com.pfizer.maps.data.PORPGToJava".                
                         
 Recovery  . . . :   Contact the person responsible
for program maintenance to  
   determine the cause of the problem.                
                         
 Possible choices for replying to message . . . . . .
. . . . . . . . . :       
   D -- Obtain RPG formatted dump.                    
                         
   S -- Obtain system dump.                           
                         
   G -- Continue processing at *GETIN.                
     

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