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  1. Red Hat Decision Manager
  2. RHDM-1621

Some expressions consisting of BigDecimal-type arithmetic operations written in MVEL dialect causes compilation errors in executable model.

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Major Major
    • 7.11.0.GA
    • 7.10.0.GA
    • BRE
    • False
    • False
    • CR1
    • +
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      1. Extract reproducer. 
        $ unzip reproducer_model_compiler_21b.zip
$ cd reproducer_model_compiler_21b
      2. Build and execute the rule. 
        $ mvn clean compile exec:exec -DgenerateModel=NO
    :
    :
***** start
***** com.example.reproducer.Bus@1a15b789, weight = 12200
***** end
    :
    :

$ mvn clean compile exec:exec -DgenerateModel=YES
    :
    :
05:29:18.595 [INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile-1) @ reproducer_model_compiler_21b ---
05:29:18.598 [INFO] Changes detected - recompiling the module!
05:29:18.599 [INFO] Compiling 6 source files to /work2/testdir/reproducer_model_compiler_21b/target/classes
05:29:18.814 [INFO] -------------------------------------------------------------
05:29:18.814 [ERROR] COMPILATION ERROR : 
05:29:18.814 [INFO] -------------------------------------------------------------
05:29:18.814 [ERROR] /work2/testdir/reproducer_model_compiler_21b/target/generated-sources/drools-model-compiler/main/java/com/example/reproducer/PC3/LambdaConsequenceC3EC93517F775872A1B91F3DCC90DB9B.java:[23,41] bad operand types for binary operator '+'
  first type:  java.math.BigDecimal
  second type: java.math.BigDecimal
05:29:18.815 [INFO] 1 error
05:29:18.815 [INFO] -------------------------------------------------------------
    :
    :
      Show
      Extract reproducer. $ unzip reproducer_model_compiler_21b.zip $ cd reproducer_model_compiler_21b Build and execute the rule. $ mvn clean compile exec:exec -DgenerateModel=NO : : ***** start ***** com.example.reproducer.Bus@1a15b789, weight = 12200 ***** end : : $ mvn clean compile exec:exec -DgenerateModel=YES : : 05:29:18.595 [INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile-1) @ reproducer_model_compiler_21b --- 05:29:18.598 [INFO] Changes detected - recompiling the module! 05:29:18.599 [INFO] Compiling 6 source files to /work2/testdir/reproducer_model_compiler_21b/target/classes 05:29:18.814 [INFO] ------------------------------------------------------------- 05:29:18.814 [ERROR] COMPILATION ERROR : 05:29:18.814 [INFO] ------------------------------------------------------------- 05:29:18.814 [ERROR] /work2/testdir/reproducer_model_compiler_21b/target/generated-sources/drools-model-compiler/main/java/com/example/reproducer/PC3/LambdaConsequenceC3EC93517F775872A1B91F3DCC90DB9B.java:[23,41] bad operand types for binary operator '+' first type: java.math.BigDecimal second type: java.math.BigDecimal 05:29:18.815 [INFO] 1 error 05:29:18.815 [INFO] ------------------------------------------------------------- : :
    • 2021 Week 10-12 (from Mar 8)

      When building a rule (*1) that contains a BigDecimal-type arithmetic operations written in MVEL dialect like (*1-1) with executable model enabled, a compilation error occurs with the message like (*3) in RHDM 7.10.0. The model compiler generates java code (*2) from (*1-1) but the generated code is not sufficient to perform BigDecimal-type arithmetic operations.

      (*1)

      package com.example.reproducer

import java.math.BigDecimal

dialect "mvel"

rule "rule21b1"
    when
        $bus : Bus()
    then
        BigDecimal bd1 = 10;
        BigDecimal bd2 = 20;
        $bus.weight = $bus.weight + (bd1.multiply(bd2));    .............. (\*1-1)
        System.out.println("***** " + $bus + ", weight = " + $bus.weight);
end

      (*2) Java code generated from (*1-1) in RHDM 7.10.0

              $bus.setWeight($bus.getWeight() + bd1.multiply(bd2));

      (*3) Error message

      05:29:18.595 [INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile-1) @ reproducer_model_compiler_21b ---
05:29:18.598 [INFO] Changes detected - recompiling the module!
05:29:18.599 [INFO] Compiling 6 source files to /work2/testdir/reproducer_model_compiler_21b/target/classes
05:29:18.814 [INFO] -------------------------------------------------------------
05:29:18.814 [ERROR] COMPILATION ERROR : 
05:29:18.814 [INFO] -------------------------------------------------------------
05:29:18.814 [ERROR] /work2/testdir/reproducer_model_compiler_21b/target/generated-sources/drools-model-compiler/main/java/com/example/reproducer/PC3/LambdaConsequenceC3EC93517F775872A1B91F3DCC90DB9B.java:[23,41] bad operand types for binary operator '+'
  first type:  java.math.BigDecimal
  second type: java.math.BigDecimal
05:29:18.815 [INFO] 1 error
05:29:18.815 [INFO] -------------------------------------------------------------

      Other operations cause compilation errors as well as '+' operation.

      • $bus.weight = $bus.weight - (bd1.multiply(bd2))
      • $bus.weight = $bus.weight * (bd1.multiply(bd2))
      • $bus.weight = $bus.weight / (bd1.multiply(bd2))

      On the releases from RHDM 7.9.0 to 7.9.1, the expression using '+' or '-' operator was successfully compiled and executed.

      • $bus.weight = $bus.weight + (bd1.multiply(bd2))
      • $bus.weight = $bus.weight - (bd1.multiply(bd2))

              lmolteni@redhat.com Luca Molteni
              rhn-support-myoshida Masato Yoshida
              Daniel Rosa Daniel Rosa
              Daniel Rosa Daniel Rosa
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                Created:
                Updated:
                Resolved: