Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/4172
Hi @wuchong . I am not an expert in Janino and how it works but I do not
think you need Janino's classloader at any point. Using the `open()` of the
`CEPOperator` you just need to compile the code of the `IterativeCondition`
whenever we have a `IterativeConditionWrapper`. In the code snippet you sent
before, line 30 should change to take the user classloader from the runtime
context. If I remember correctly it is
`getRuntimeContext().getUserClassLoader()`.
This will allow Janino to do its magic using the user classloader. After
compiling the class, you can set the `newCondition` field of the
`StateTransitions` to an object of the compiled class.
After this, whenever you have a checkpoint or whenever you
serialize/deserialize the condition, given that this will be a regular
IterativeCondition, Flink will know how to do it.
I am also including @twalthr and @fhueske on this to comment, as they have
more experience with this. In addition, if you have a prototype that does all
this but fails at some step with an error, you can send a link and we can try
to check it out.
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