RS03864: LOCAL RULE VARIABLES MAY HAVE ALWAYS THE SAME VALUE IN DE

21.0.2-WS-CP4BA-IF011
21.0.3-WS-CP4BA-IF007
Operational Decision Manager V8.9.2.3: Interim Fix 22 for Engine
Operational Decision Manager V8.9.2.1: Interim Fix 54 for Engine

APAR status

• Closed as program error.

Error description

• hen using Decision Engine sequential or fastpath algorithm if 2
  local variables are initialized with the same value in the
  condition part of a rule they are seen as the same, so modifying
  the value of one variable lead to the other being modified the
  same way.
  the rule
  when {
  context:IlrContext() from ?context;
  evaluate (a : 0);
  evaluate (b : 0);
  }
  then {
  System.out.println("a = "+a);
  System.out.println("b = "+b);
  System.out.println("*************");
  b = 14 - a;
  System.out.println("a = "+a);
  System.out.println("b = "+b);
  }
  
  prints
  
  a = 0
  b = 0
  *************
  a = 14
  b = 14
  
  where you would expect
  a=0
  b=14
  

Local fix

• initialize variables with different expression to prevent their
  unification, for example to resolve the problem in the sample
  given use:
  evaluate(a: 1-1);
  evaluate(b:2-2);
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Using Decision Engine sequential or fastpath algorithm with  *
  * initialization of local variables.                           *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * When using Decision Engine sequential or fastpath algorithm  *
  * if 2                                                         *
  * local variables are initialized with the same value in the   *
  * condition part of a rule they are seen as the same, so       *
  * modifying                                                    *
  * the value of one variable lead to the other being modified   *
  * the                                                          *
  * same way.                                                    *
  * the rule                                                     *
  * when {                                                       *
  * context:IlrContext() from ?context;                          *
  * evaluate (a : 0);                                            *
  * evaluate (b : 0);                                            *
  * }                                                            *
  * then {                                                       *
  * System.out.println("a = "+a);                                *
  * System.out.println("b = "+b);                                *
  * System.out.println("*************");                         *
  * b = 14 - a;                                                  *
  * System.out.println("a = "+a);                                *
  * System.out.println("b = "+b);                                *
  * }                                                            *
  *                                                              *
  * prints                                                       *
  *                                                              *
  * a = 0                                                        *
  * b = 0                                                        *
  * *************                                                *
  * a = 14                                                       *
  * b = 14                                                       *
  *                                                              *
  * where you would expect                                       *
  * a=0                                                          *
  * b=14                                                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  

Problem conclusion

• The code is fixed.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WDS FOR RULES

• Fixed component ID

  5725B6903

Applicable component levels