[Bug]: The script transform randomly fails while obtaining scripting language

[fraserward]

Apache Hop version?

2.7.0

Java version?

opernjdk 11.0.22

Operating system

Linux

What happened?

I run the same code every few hours and 95% of the time it works, but 5% of the time I get an error on the script transform about loading the engine. This is with both python and EMCAScript language as the script engine.

ERROR: Error obtaining scripting engine for language ECMAScript
ERROR: java.util.ConcurrentModificationException
at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1135)
at org.apache.hop.pipeline.transforms.script.ScriptUtils.populateEngineFactoryMap(ScriptUtils.java:117)
at org.apache.hop.pipeline.transforms.script.ScriptUtils.getScriptEngineManager(ScriptUtils.java:94)
at org.apache.hop.pipeline.transforms.script.ScriptUtils.populateEngineFactoryMap(ScriptUtils.java:112)
at org.apache.hop.pipeline.transforms.script.ScriptUtils.createNewScriptEngineByLanguage(ScriptUtils.java:59)
at org.apache.hop.pipeline.transforms.script.Script.init(Script.java:691)
at org.apache.hop.pipeline.transform.TransformInitThread.run(TransformInitThread.java:66)
at java.base/java.lang.Thread.run(Thread.java:829

and

ERROR: Error obtaining scripting engine for language python
ERROR: java.util.ConcurrentModificationException
at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1135)
at org.apache.hop.pipeline.transforms.script.ScriptUtils.populateEngineFactoryMap(ScriptUtils.java:117)
at org.apache.hop.pipeline.transforms.script.ScriptUtils.getScriptEngineManager(ScriptUtils.java:94)
at org.apache.hop.pipeline.transforms.script.ScriptUtils.populateEngineFactoryMap(ScriptUtils.java:112)
at org.apache.hop.pipeline.transforms.script.ScriptUtils.createNewScriptEngineByLanguage(ScriptUtils.java:59)
at org.apache.hop.pipeline.transforms.script.Script.init(Script.java:691)
at org.apache.hop.pipeline.transform.TransformInitThread.run(TransformInitThread.java:66)
at java.base/java.lang.Thread.run(Thread.java:829)

Issue Priority

Priority: 3

Issue Component

Component: Transforms

[bamaer]

3729-concurrent-exception-in-scripts.hpl.txt