shangeyao opened a new issue, #4428:
URL: https://github.com/apache/streampark/issues/4428

   ## Parent Issue
   Part of #4408 — Remove Scala from StreamPark.
   
   ## Implementation Track
   Delivered in PR #4418 on branch `feature/remove-scala`.
   
   ## Scope
   Design and implement `FlinkStreamingJob` abstract base class in 
`org.apache.streampark.flink.core.java` package. Preserve lifecycle execution 
order: `main` → `init` → `ready` → `handle` → `execute` → `destroy`. Use Java 
DataStream API exclusively (Flink 1.17–1.20).
   
   ## Estimated Files
   ~1 new Java file; replaces `FlinkStreaming.scala`
   
   ## Dependencies
   - Depends on #4417 (JDK 11 baseline)
   
   ## Acceptance Criteria
   - [ ] `FlinkStreamingJob` compiles and lifecycle order matches Scala 
trait\n- [ ] `handle()` is abstract; `ready()`, `destroy()`, `configure()` have 
empty defaults\n- [ ] Migration note added to Javadoc
   
   ---
   _Sub-issue 0.1 of Scala removal epic (#4408)._


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