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  1. Drools
  2. DROOLS-5928

The use of AND in source pattern of accumulate causes compilation error in executable model.

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Major Major
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    • executable model
    • 2020 Week 52-03 (from Dec 21)
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      1. Extract reproducer. 
        $ unzip reproducer_model_compiler_7a.zip
$ cd reproducer_model_compiler_7a
      2. Build and execute the rule. 
        $ ./run_mvn    # mvn clean compile exec:exec -DgenerateModel=YES
    :
    :
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile-1) @ reproducer_model_compiler_7a ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 13 source files to /work2/testdir/reproducer_model_compiler_7a/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /work2/testdir/reproducer_model_compiler_7a/target/generated-sources/drools-model-compiler/main/java/com/example/reproducer/Rulese69ee9f6a2a84acaa675792cae099156RuleMethods0.java:[28,63] method accumulate in class org.drools.model.DSL cannot be applied to given types;
  required: org.drools.model.view.ViewItem<?>,org.drools.model.functions.accumulate.AccumulateFunction,org.drools.model.functions.accumulate.AccumulateFunction[]
  found: org.drools.model.view.ViewItem
  reason: cannot infer type-variable(s) T
    (actual and formal argument lists differ in length)
[INFO] 1 error
[INFO] -------------------------------------------------------------
    :
    :
      Show
      Extract reproducer. $ unzip reproducer_model_compiler_7a.zip $ cd reproducer_model_compiler_7a Build and execute the rule. $ ./run_mvn # mvn clean compile exec:exec -DgenerateModel=YES : : [INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile-1) @ reproducer_model_compiler_7a --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 13 source files to /work2/testdir/reproducer_model_compiler_7a/target/classes [INFO] ------------------------------------------------------------- [ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [ERROR] /work2/testdir/reproducer_model_compiler_7a/target/generated-sources/drools-model-compiler/main/java/com/example/reproducer/Rulese69ee9f6a2a84acaa675792cae099156RuleMethods0.java:[28,63] method accumulate in class org.drools.model.DSL cannot be applied to given types; required: org.drools.model.view.ViewItem<?>,org.drools.model.functions.accumulate.AccumulateFunction,org.drools.model.functions.accumulate.AccumulateFunction[] found: org.drools.model.view.ViewItem reason: cannot infer type-variable(s) T (actual and formal argument lists differ in length) [INFO] 1 error [INFO] ------------------------------------------------------------- : :
    • Undefined
    • NEW
    • NEW
    • ---
    • ---

      Building a rule written in MVEL dialect like (*1) using AND in source pattern of accumulate like (*1-1) in executable rule model, a compilation error (*2) occurs. This issue does not occur when we build the rule with executable model disabled.

      (*1)

      package com.example.reproducer

import java.math.BigDecimal

dialect "mvel"

rule "rule7a2"
    when
        $total : BigDecimal() from accumulate( $car : Car( discontinued == true ) and Order( item == $car, $price : price ),    // ..... (*1-1)
                                               init( BigDecimal total = BigDecimal.ZERO; ),
                                               action( total += $price; ),
                                               reverse( total -= $price; ),
                                               result( total ) )
    then
        System.out.println("***** Action of rule7a2 -- $total = " + $total);
end

      (*2)

      [ERROR] /work2/testdir/reproducer_model_compiler_7a/target/generated-sources/drools-model-compiler/main/java/com/example/reproducer/Rulese69ee9f6a2a84acaa675792cae099156RuleMethods0.java:[28,63] method accumulate in class org.drools.model.DSL cannot be applied to given types;
  required: org.drools.model.view.ViewItem<?>,org.drools.model.functions.accumulate.AccumulateFunction,org.drools.model.functions.accumulate.AccumulateFunction[]
  found: org.drools.model.view.ViewItem
  reason: cannot infer type-variable(s) T
    (actual and formal argument lists differ in length)

        1. reproducer_model_compiler_7a.zip
          8 kB

              mfusco@redhat.com Mario Fusco
              mfusco@redhat.com Mario Fusco
              Daniel Rosa Daniel Rosa
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                Created:
                Updated:
                Resolved: