yurloc opened a new issue, #5909:
URL: https://github.com/apache/incubator-kie-drools/issues/5909
## Parent issue
- #5678
## Failing tests
-
`org.drools.compiler.integrationtests.AccumulateTest#testAccumulateReturningNull`
## Notes
The error message is not very helpful but the stack trace is. This line is
important:
```
at
org.drools.model.codegen.execmodel.generator.visitor.ModelGeneratorVisitor.visit(ModelGeneratorVisitor.java:132)
```
In debug mode and a break point on this line, it can be observed that the
`patternSource` is actually a `FromDesr`, and not an `AccumulateDescr` as
expected. The empty `init()` and `action()` statements are incompliant with the
`fromAccumulate` parser rule and so the parser is forced to recognize this
accumulate statement using `fromExpression`.
## Rule code snippet
```
$totalAmount : Number() from accumulate( Cheese( $price : price ),
init( ),
action( ),
result( null ) );
```
## Error output
```
### parse : ANTLR4_PARSER_ENABLED = true
com.github.javaparser.ParseProblemException: Encountered unexpected token:
":" ":"
at line 1, column 28.
Was expecting one of:
"!="
"%"
"%="
"&"
"&&"
"&="
"("
")"
"*"
"*="
"+"
"+="
","
"-"
"-="
"->"
"/"
"/="
"::"
"<"
"<<="
"<="
"="
"=="
">"
">="
">>="
">>>="
"?"
"^"
"^="
"instanceof"
"|"
"|="
"||"
Problem stacktrace :
org.drools.mvel.parser.GeneratedMvelParser.generateParseException(GeneratedMvelParser.java:16175)
org.drools.mvel.parser.GeneratedMvelParser.jj_consume_token(GeneratedMvelParser.java:16017)
org.drools.mvel.parser.GeneratedMvelParser.Arguments(GeneratedMvelParser.java:5288)
org.drools.mvel.parser.GeneratedMvelParser.PrimaryPrefix(GeneratedMvelParser.java:4929)
org.drools.mvel.parser.GeneratedMvelParser.PrimaryExpression(GeneratedMvelParser.java:4640)
org.drools.mvel.parser.GeneratedMvelParser.PostfixExpression(GeneratedMvelParser.java:4504)
org.drools.mvel.parser.GeneratedMvelParser.UnaryExpressionNotPlusMinus(GeneratedMvelParser.java:4474)
org.drools.mvel.parser.GeneratedMvelParser.DrlxExpressionSwitch(GeneratedMvelParser.java:4375)
org.drools.mvel.parser.GeneratedMvelParser.HalfBinaryExpression(GeneratedMvelParser.java:4310)
org.drools.mvel.parser.GeneratedMvelParser.UnaryExpression(GeneratedMvelParser.java:4201)
org.drools.mvel.parser.GeneratedMvelParser.MultiplicativeExpression(GeneratedMvelParser.java:4102)
org.drools.mvel.parser.GeneratedMvelParser.AdditiveExpression(GeneratedMvelParser.java:4054)
org.drools.mvel.parser.GeneratedMvelParser.ShiftExpression(GeneratedMvelParser.java:4009)
org.drools.mvel.parser.GeneratedMvelParser.RelationalExpression(GeneratedMvelParser.java:3949)
org.drools.mvel.parser.GeneratedMvelParser.InstanceOfExpression(GeneratedMvelParser.java:3868)
org.drools.mvel.parser.GeneratedMvelParser.EqualityExpression(GeneratedMvelParser.java:3798)
org.drools.mvel.parser.GeneratedMvelParser.AndExpression(GeneratedMvelParser.java:3753)
org.drools.mvel.parser.GeneratedMvelParser.ExclusiveOrExpression(GeneratedMvelParser.java:3713)
org.drools.mvel.parser.GeneratedMvelParser.InclusiveOrExpression(GeneratedMvelParser.java:3673)
org.drools.mvel.parser.GeneratedMvelParser.ConditionalAndExpression(GeneratedMvelParser.java:3633)
org.drools.mvel.parser.GeneratedMvelParser.ConditionalOrExpression(GeneratedMvelParser.java:3588)
org.drools.mvel.parser.GeneratedMvelParser.ConditionalExpression(GeneratedMvelParser.java:3556)
org.drools.mvel.parser.GeneratedMvelParser.Expression(GeneratedMvelParser.java:3360)
org.drools.mvel.parser.GeneratedMvelParser.ArgumentList(GeneratedMvelParser.java:5302)
org.drools.mvel.parser.GeneratedMvelParser.Arguments(GeneratedMvelParser.java:5284)
org.drools.mvel.parser.GeneratedMvelParser.PrimaryPrefix(GeneratedMvelParser.java:4929)
org.drools.mvel.parser.GeneratedMvelParser.PrimaryExpression(GeneratedMvelParser.java:4640)
org.drools.mvel.parser.GeneratedMvelParser.PostfixExpression(GeneratedMvelParser.java:4504)
org.drools.mvel.parser.GeneratedMvelParser.UnaryExpressionNotPlusMinus(GeneratedMvelParser.java:4474)
org.drools.mvel.parser.GeneratedMvelParser.DrlxExpressionSwitch(GeneratedMvelParser.java:4375)
org.drools.mvel.parser.GeneratedMvelParser.HalfBinaryExpression(GeneratedMvelParser.java:4310)
org.drools.mvel.parser.GeneratedMvelParser.UnaryExpression(GeneratedMvelParser.java:4201)
org.drools.mvel.parser.GeneratedMvelParser.MultiplicativeExpression(GeneratedMvelParser.java:4102)
org.drools.mvel.parser.GeneratedMvelParser.AdditiveExpression(GeneratedMvelParser.java:4054)
org.drools.mvel.parser.GeneratedMvelParser.ShiftExpression(GeneratedMvelParser.java:4009)
org.drools.mvel.parser.GeneratedMvelParser.RelationalExpression(GeneratedMvelParser.java:3949)
org.drools.mvel.parser.GeneratedMvelParser.InstanceOfExpression(GeneratedMvelParser.java:3868)
org.drools.mvel.parser.GeneratedMvelParser.EqualityExpression(GeneratedMvelParser.java:3798)
org.drools.mvel.parser.GeneratedMvelParser.AndExpression(GeneratedMvelParser.java:3753)
org.drools.mvel.parser.GeneratedMvelParser.ExclusiveOrExpression(GeneratedMvelParser.java:3713)
org.drools.mvel.parser.GeneratedMvelParser.InclusiveOrExpression(GeneratedMvelParser.java:3673)
org.drools.mvel.parser.GeneratedMvelParser.ConditionalAndExpression(GeneratedMvelParser.java:3633)
org.drools.mvel.parser.GeneratedMvelParser.ConditionalOrExpression(GeneratedMvelParser.java:3588)
org.drools.mvel.parser.GeneratedMvelParser.ConditionalExpression(GeneratedMvelParser.java:3556)
org.drools.mvel.parser.GeneratedMvelParser.Expression(GeneratedMvelParser.java:3360)
org.drools.mvel.parser.GeneratedMvelParser.DrlxExpression(GeneratedMvelParser.java:8707)
org.drools.mvel.parser.DrlxParser.lambda$static$0(DrlxParser.java:40)
org.drools.mvel.parser.MvelParser.parse(MvelParser.java:140)
org.drools.mvel.parser.DrlxParser.simplifiedParse(DrlxParser.java:54)
org.drools.mvel.parser.DrlxParser.parseExpression(DrlxParser.java:50)
org.drools.model.codegen.execmodel.generator.DrlxParseUtil.parseExpression(DrlxParseUtil.java:688)
org.drools.model.codegen.execmodel.generator.visitor.FromVisitor.createSingleFrom(FromVisitor.java:91)
org.drools.model.codegen.execmodel.generator.visitor.FromVisitor.visit(FromVisitor.java:80)
java.base/java.util.Optional.flatMap(Optional.java:289)
org.drools.model.codegen.execmodel.generator.visitor.pattern.ClassPatternDSL.buildFromDeclaration(ClassPatternDSL.java:153)
org.drools.model.codegen.execmodel.generator.visitor.pattern.ClassPatternDSL.initPattern(ClassPatternDSL.java:96)
org.drools.model.codegen.execmodel.generator.visitor.pattern.PatternDSL.buildPattern(PatternDSL.java:57)
org.drools.model.codegen.execmodel.generator.visitor.ModelGeneratorVisitor.visit(ModelGeneratorVisitor.java:132)
org.drools.drl.ast.descr.PatternDescr.accept(PatternDescr.java:278)
org.drools.model.codegen.execmodel.generator.visitor.AndVisitor.visit(AndVisitor.java:52)
org.drools.model.codegen.execmodel.generator.visitor.ModelGeneratorVisitor.visit(ModelGeneratorVisitor.java:70)
org.drools.model.codegen.execmodel.generator.ModelGenerator.processRule(ModelGenerator.java:204)
org.drools.model.codegen.execmodel.generator.ModelGenerator.processRuleDescr(ModelGenerator.java:185)
org.drools.model.codegen.execmodel.generator.ModelGenerator.processRules(ModelGenerator.java:164)
org.drools.model.codegen.execmodel.generator.ModelGenerator.generateModel(ModelGenerator.java:130)
org.drools.model.codegen.execmodel.processors.ModelGeneratorPhase.process(ModelGeneratorPhase.java:48)
org.drools.compiler.builder.impl.processors.IteratingPhase.process(IteratingPhase.java:53)
org.drools.model.codegen.execmodel.processors.ModelMainCompilationPhase.process(ModelMainCompilationPhase.java:104)
org.drools.model.codegen.execmodel.ModelBuilderImpl.doSecondBuildStep(ModelBuilderImpl.java:114)
org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:125)
org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:109)
org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:274)
org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:220)
org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:84)
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:285)
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:251)
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:208)
org.drools.testcoverage.common.util.KieUtil.getKieBuilderFromKieFileSystem(KieUtil.java:147)
org.drools.testcoverage.common.util.KieUtil.getKieBuilderFromKieFileSystem(KieUtil.java:134)
org.drools.testcoverage.common.util.KieUtil.buildAndInstallKieModuleIntoRepo(KieUtil.java:78)
org.drools.testcoverage.common.util.KieUtil.buildAndInstallKieModuleIntoRepo(KieUtil.java:72)
org.drools.testcoverage.common.util.KieUtil.getKieModuleFromResources(KieUtil.java:249)
org.drools.testcoverage.common.util.KieUtil.getKieModuleFromResources(KieUtil.java:238)
org.drools.testcoverage.common.util.KieBaseUtil.getKieBaseFromKieModuleFromResources(KieBaseUtil.java:102)
org.drools.testcoverage.common.util.KieBaseUtil.getKieBaseFromKieModuleFromDrl(KieBaseUtil.java:115)
org.drools.compiler.integrationtests.AccumulateTest.testAccumulateReturningNull(AccumulateTest.java:854)
at org.drools.mvel.parser.DrlxParser.simplifiedParse(DrlxParser.java:58)
at org.drools.mvel.parser.DrlxParser.parseExpression(DrlxParser.java:50)
at
org.drools.model.codegen.execmodel.generator.DrlxParseUtil.parseExpression(DrlxParseUtil.java:688)
at
org.drools.model.codegen.execmodel.generator.visitor.FromVisitor.createSingleFrom(FromVisitor.java:91)
at
org.drools.model.codegen.execmodel.generator.visitor.FromVisitor.visit(FromVisitor.java:80)
at java.base/java.util.Optional.flatMap(Optional.java:289)
at
org.drools.model.codegen.execmodel.generator.visitor.pattern.ClassPatternDSL.buildFromDeclaration(ClassPatternDSL.java:153)
at
org.drools.model.codegen.execmodel.generator.visitor.pattern.ClassPatternDSL.initPattern(ClassPatternDSL.java:96)
at
org.drools.model.codegen.execmodel.generator.visitor.pattern.PatternDSL.buildPattern(PatternDSL.java:57)
at
org.drools.model.codegen.execmodel.generator.visitor.ModelGeneratorVisitor.visit(ModelGeneratorVisitor.java:132)
at org.drools.drl.ast.descr.PatternDescr.accept(PatternDescr.java:278)
at
org.drools.model.codegen.execmodel.generator.visitor.AndVisitor.visit(AndVisitor.java:52)
at
org.drools.model.codegen.execmodel.generator.visitor.ModelGeneratorVisitor.visit(ModelGeneratorVisitor.java:70)
at
org.drools.model.codegen.execmodel.generator.ModelGenerator.processRule(ModelGenerator.java:204)
at
org.drools.model.codegen.execmodel.generator.ModelGenerator.processRuleDescr(ModelGenerator.java:185)
at
org.drools.model.codegen.execmodel.generator.ModelGenerator.processRules(ModelGenerator.java:164)
at
org.drools.model.codegen.execmodel.generator.ModelGenerator.generateModel(ModelGenerator.java:130)
at
org.drools.model.codegen.execmodel.processors.ModelGeneratorPhase.process(ModelGeneratorPhase.java:48)
at
org.drools.compiler.builder.impl.processors.IteratingPhase.process(IteratingPhase.java:53)
at
org.drools.model.codegen.execmodel.processors.ModelMainCompilationPhase.process(ModelMainCompilationPhase.java:104)
at
org.drools.model.codegen.execmodel.ModelBuilderImpl.doSecondBuildStep(ModelBuilderImpl.java:114)
at
org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:125)
at
org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:109)
at
org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:274)
at
org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:220)
at
org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:84)
at
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:285)
at
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:251)
at
org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:208)
at
org.drools.testcoverage.common.util.KieUtil.getKieBuilderFromKieFileSystem(KieUtil.java:147)
at
org.drools.testcoverage.common.util.KieUtil.getKieBuilderFromKieFileSystem(KieUtil.java:134)
at
org.drools.testcoverage.common.util.KieUtil.buildAndInstallKieModuleIntoRepo(KieUtil.java:78)
at
org.drools.testcoverage.common.util.KieUtil.buildAndInstallKieModuleIntoRepo(KieUtil.java:72)
at
org.drools.testcoverage.common.util.KieUtil.getKieModuleFromResources(KieUtil.java:249)
at
org.drools.testcoverage.common.util.KieUtil.getKieModuleFromResources(KieUtil.java:238)
at
org.drools.testcoverage.common.util.KieBaseUtil.getKieBaseFromKieModuleFromResources(KieBaseUtil.java:102)
at
org.drools.testcoverage.common.util.KieBaseUtil.getKieBaseFromKieModuleFromDrl(KieBaseUtil.java:115)
at
org.drools.compiler.integrationtests.AccumulateTest.testAccumulateReturningNull(AccumulateTest.java:854)
```
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