Cannot use as parameter of a function the result of another function receiving a parameter of its own ----------------------------------------------------------------------------------------------------- Key: DROOLS-5609 URL: https://issues.redhat.com/browse/DROOLS-5609 Project: Drools Issue Type: Bug Components: executable model Affects Versions: 7.42.0.Final Reporter: Ciprian Chiru Assignee: Luca Molteni Priority: Major Given the following rule:   {code:java} import java.util.*; global java.util.Set controlSet; global org.example.drools.service.DummyService dummyService; rule "will execute per each Measurement having ID color" no-loop when Measurement( id == "color", $colorVal : val ) String() from dummyService.dummy(dummyService.dummy($colorVal)) then controlSet.add($colorVal); end{code}   The compilation fails with: {code:java} [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile-1) on project rules: Compilation failure [ERROR] .../target/generated-sources/drools-model-compiler/main/java/rules/Rules38bbab4141b64289855d5e28d5f95ca6RuleMethods0.java:[24,111] no suitable method found for from(org.drools.model.Global<org.example.drools.service.DummyService>,org.drools.model.Global<org.example.drools.service.DummyService>,org.drools.model.Variable<java.lang.String>,rules.P4C.LambdaExtractor4CA52645EC5319D0363A23796D4739AE) [ERROR] method org.drools.model.DSL.<T>from(T) is not applicable [ERROR] (cannot infer type-variable(s) T [ERROR] (actual and formal argument lists differ in length)) [ERROR] method org.drools.model.DSL.<T>from(org.drools.model.Variable<T>) is not applicable [ERROR] (cannot infer type-variable(s) T [ERROR] (actual and formal argument lists differ in length)) [ERROR] method org.drools.model.DSL.<T>from(org.drools.model.functions.Function0<T>) is not applicable [ERROR] (cannot infer type-variable(s) T [ERROR] (actual and formal argument lists differ in length)) [ERROR] method org.drools.model.DSL.<T>from(org.drools.model.Variable<T>,org.drools.model.functions.Function1<T,?>) is not applicable [ERROR] (cannot infer type-variable(s) T [ERROR] (actual and formal argument lists differ in length)) [ERROR] method org.drools.model.DSL.<A,B>from(org.drools.model.Variable<A>,org.drools.model.Variable<B>,org.drools.model.functions.Function2<A,B,?>) is not applicable [ERROR] (cannot infer type-variable(s) A,B [ERROR] (actual and formal argument lists differ in length)) [ERROR] method org.drools.model.DSL.<A,B,C>from(org.drools.model.Variable<A>,org.drools.model.Variable<B>,org.drools.model.Variable<C>,org.drools.model.functions.Function3<A,B,C,?>) is not applicable [ERROR] (cannot infer type-variable(s) A,B,C [ERROR] (argument mismatch; rules.P4C.LambdaExtractor4CA52645EC5319D0363A23796D4739AE cannot be converted to org.drools.model.functions.Function3<A,B,C,?>)) [ERROR] method org.drools.model.DSL.<A,B,C,D>from(org.drools.model.Variable<A>,org.drools.model.Variable<B>,org.drools.model.Variable<C>,org.drools.model.Variable<D>,org.drools.model.functions.Function4<A,B,C,D,?>) is not applicable [ERROR] (cannot infer type-variable(s) A,B,C,D [ERROR] (actual and formal argument lists differ in length)){code} This error can be reproduced with version _7.43.0-SNAPSHOT_