When using GroovyScriptEngine.loadScriptByName(scriptName), the reloading will fail with a groovy.util.ResourceException if a dependent class has been removed from the script root filesystem. To reproduce this issue, start with a script and a dependent class:
When these classes are initially compiled with GroovyScriptEngine, things work fine. There are no errors when loading the script like this:
However, once DependentClass.groovy is completely removed from the filesystem and ClassA is modified to remove the reference, the same gse.loadScriptByName('ClassA.groovy') will fail with a groovy.utilResourceExeption.
It appears GroovyScriptEngine keeps a dependency cache and gets confused in this case. The line that fails is a check for lastModifedTime of this dependency. The dependency of course no longer exists, but the check for lastModiedTime occurs before ClassA compile has been attempted.
I am working on a PR that fixes this. It seems to me that inside gse.isSourceNewer(entry), it can just treat a ResourceException during getLastModifed(scriptName) as an indication to just attempt a recompile instead of throwing the exception.