HongYi Chen created KAFKA-19786:
-----------------------------------
Summary: Session mode compileScala reports missing classes java
main directory
Key: KAFKA-19786
URL: https://issues.apache.org/jira/browse/KAFKA-19786
Project: Kafka
Issue Type: Bug
Components: build
Affects Versions: 4.1.0
Reporter: HongYi Chen
Assignee: HongYi Chen
*Problem*
When running `{{{}:core:compileScala{}}}` under
{{{}`keepAliveMode=SESSION`{}}}, joint compilation adds a non-existent
directory ({{{}.../core/build/classes/java/main{}}}) to {{{}javac{}}}’s
classpath.
This triggers:
```
Unexpected javac output: warning: [path] bad path element
".../core/build/classes/java/main": no such file or directory
error: warnings found and -Werror specified
```
The same task succeeds under `{{{}keepAliveMode=DAEMON`{}}}.
*Current Workaround*
Added a scoped compiler flag `({{{}-Xlint:-path{}}})` only under
`{{{}keepAliveMode=SESSION`{}}} to suppress the {{[path]}} warning and allow
the build to succeed.
*Steps to Reproduce*
```
./gradlew clean :core:compileScala -PkeepAliveMode=session # fails before
workaround
./gradlew clean :core:compileScala -PkeepAliveMode=daemon # succeeds
```
*Goal of This Ticket*
Identify why SESSION-mode joint compilation includes the missing
{{classes/java/main}} entry in {{{}javac{}}}’s classpath, align its behavior
with DAEMON mode, and remove the temporary suppression once the classpath is
corrected.
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