RS01143: NPE DURING RULESET PARSING USING FASTPATH OR SEQUENTIAL ALGORITHM IF A RULE IS USING LIST OF ENUMS

Operational Decision Manager V8.0.1 Download Document
WebSphere Operational Decision Management V7.5.0.3 Fix Pack

APAR status

• Closed as program error.

Error description

• An NPE exception is thrown during ruleset parsing.
  
  Exception in thread "main" java.lang.NullPointerException
         at ilog.jit.lang.IlxJITInvokeExpr.getType(Unknown Source)
         at ilog.jit.coding.IlxJITStatCoder.visit(Unknown Source)
         at ilog.jit.lang.IlxJITReturnStat.accept(Unknown Source)
   ..
         at
  ilog.rules.engine.sequential.platform.IlrSEQTaskFactory.a(Unknow
  n Source)
         at
  ilog.rules.engine.sequential.platform.IlrSEQTaskFactory.newTaskI
  mpl(Unknown Source)
         at ilog.rules.engine.IlrRuleset$4.run(Unknown Source)
         at
  java.security.AccessController.doPrivileged(AccessController.jav
  a:202)
         at ilog.rules.engine.IlrRuleset.generateTaskImpl(Unknown
  Source)
         at ilog.rules.engine.IlrRuleset$3.run(Unknown Source)
  ..
         at ilog.rules.engine.IlrRuleset.a(Unknown Source)
         at ilog.rules.engine.IlrRulesetArchiveParser.for(Unknown
  Source)
  ..
         at
  ilog.rules.engine.IlrRulesetArchiveParser.parseArchive(Unknown
  Source)
         at
  SimpleRuleEngineRunner.main(SimpleRuleEngineRunner.java:36)
  
  The rule task algorithm is defined as Fastpath. Problem also
  exist in Sequential
  The issue is due to a certain rule binding:  when a variable is
  bind to an Enum and then in the "if" section, one checks whether
  this variable is one of the object in a list of another class.
  An example of such rule is as follows:-
  
  definitions
      set 'record' to a record in the records of 'the application'
  ;
      set 'my history details' to a history detail  in the hists
  of record ;
      set 'my code' to an enum code modificator in the code
  modificators of 'my history details' ;
      set 'info' to an additional info ;
  
  if
    'my code' is one of the code modificators of info
  then
     print "test";
  

Local fix

• 1) Use Rete
  2) The issue occurs in a rule statement where one looks
  for an <enum> in a list of <enum>.
  In order to avoid the problem the <enum> object should be
  looked into an array of <enum>
  Converting  the method returning a list of Enum into an method
  returning an array can be done at the B2X level.
  - Change the type of this BOM method to the array of the <enum>
  ( xom.MyEnum[ )]
  In it's b2x  return the array of the <enum> instead of
  List.
  return (xom.MyEnum[])this.getMyBOMMember().toArray(new
  xom.MyEnum[this.getMyBOMMember().size()]);
  

Problem summary

• the code generating the executable  code corresponding to teh
  condition does not handle a list of enum
  

Problem conclusion

• The code is modified so that list of enums are generated
  properly
  

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:

Modules/Macros

• None
  999
  

Fix information

• Fixed component name

  WS ILOG RTS

• Fixed component ID

  5724Y0000

Applicable component levels

• R711 PSY

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