One more observation and its solution: Default behaviour: the flexmojos-maven-plugin tries to generate the flex compiler configuration file via the plugin goal generate-config-swf whenever the pom.xml changes.
Problematic scenario: if your pom.xml has only the plugin declarations with 'executions' in it, then the above goal fails with following error: /java.lang.RuntimeException: org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.sonatype.flexmojos:flexmojos-maven-plugin:3.8:generate-config-swf (default-cli) on project TreasuryAgreements-UI: Source file not expecified and no default found!/ Solution: need to add one dummy plugin declaration without 'executions' as mentioned above for similar error. After that, the error no longer appears and the config file is generated correctly. -- Sent from: http://apache-flex-development.2333347.n4.nabble.com/