$ unzip reproducer_02801729_1b.zip $ cd reproducer_02801729_1b $ mvn clean compile exec:exec -DgenerateModel=NO : : [INFO] --- kie-maven-plugin:7.44.0.Final-redhat-00003:build (default-build) @ reproducer_02801729_1b --- : : [ERROR] Unable to build KieBaseModel:rules Unable to Analyse Expression for ( Bus bus : $buses ) { System.out.println("bus: " + bus); };: [Error: cannot resolve identifier: Bu] [Near : {... for ( Bus bus : $buses ) { ....}] ^ [Line: 8, Column: 0] : [Rule name='bus1'] [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 2.504 s [INFO] Finished at: 2020-11-18T13:00:35+09:00 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.kie:kie-maven-plugin:7.44.0.Final-redhat-00003:build (default-build) on project reproducer_02801729_1b: Execution default-build of goal org.kie:kie-maven-plugin:7.44.0.Final-redhat-00003:build failed: Unable to get KieModule, Errors Existed: Error Messages: [ERROR] Message [id=1, kieBase=rules, level=ERROR, path=com/example/reproducer/Sample.drl, line=8, column=0 [ERROR] text=Unable to Analyse Expression for ( Bus bus : $buses ) { System.out.println("bus: " + bus); };: [ERROR] [Error: cannot resolve identifier: Bu] [ERROR] [Near : {... for ( Bus bus : $buses ) { ....}] [ERROR] ^ [ERROR] [Line: 8, Column: 0]] [ERROR] --- [ERROR] Warning Messages: [ERROR] --- [ERROR] Info Messages: [ERROR] [ERROR] -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException