Running mvn scala:run without compiling again

I’m running mvn scala:compile and then mvn scala:run.

But seems that mvn scala:run is calling the compile and skipping it because files are already there. Is there an option to run it wuthout checking?

$ mvn scala:run -DmainClass=example.Hello
[INFO] Scanning for projects...
[INFO] 
[INFO] -------------------< com.example:sample-scala-hbase >-------------------
[INFO] Building Sample Scala HBase App 1.0.0
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] >>> scala-maven-plugin:3.3.2:run (default-cli) > test-compile @ sample-scala-hbase >>>
Downloading from apache.snapshots: https://repository.apache.org/snapshots/net/minidev/json-smart/maven-metadata.xml
Downloading from apache.snapshots.https: https://repository.apache.org/content/repositories/snapshots/net/minidev/json-smart/maven-metadata.xml
Downloading from central: https://repo.maven.apache.org/maven2/net/minidev/json-smart/maven-metadata.xml
Downloading from dynamodb-local-oregon: https://s3-us-west-2.amazonaws.com/dynamodb-local/release/net/minidev/json-smart/maven-metadata.xml
Downloading from repository.jboss.org: https://repository.jboss.org/nexus/content/groups/public/net/minidev/json-smart/maven-metadata.xml
Downloaded from central: https://repo.maven.apache.org/maven2/net/minidev/json-smart/maven-metadata.xml (1.2 kB at 934 B/s)
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ sample-scala-hbase ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ sample-scala-hbase ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- scala-maven-plugin:3.3.2:compile (default) @ sample-scala-hbase ---
[WARNING]  Expected all dependencies to require Scala version: 2.13.8
[WARNING]  com.example:sample-scala-hbase:1.0.0 requires scala version: 2.13.8
[WARNING]  org.scalameta:munit_2.13:0.7.29 requires scala version: 2.13.6
[WARNING] Multiple versions of scala libraries detected!
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ sample-scala-hbase ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory D:\projects\sample-scala-hbase\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ sample-scala-hbase ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- scala-maven-plugin:3.3.2:testCompile (default) @ sample-scala-hbase ---
[WARNING]  Expected all dependencies to require Scala version: 2.13.8
[WARNING]  com.example:sample-scala-hbase:1.0.0 requires scala version: 2.13.8
[WARNING]  org.scalameta:munit_2.13:0.7.29 requires scala version: 2.13.6
[WARNING] Multiple versions of scala libraries detected!
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] <<< scala-maven-plugin:3.3.2:run (default-cli) < test-compile @ sample-scala-hbase <<<
[INFO]
[INFO]
[INFO] --- scala-maven-plugin:3.3.2:run (default-cli) @ sample-scala-hbase ---
[WARNING]  Expected all dependencies to require Scala version: 2.13.8
[WARNING]  com.example:sample-scala-hbase:1.0.0 requires scala version: 2.13.8
[WARNING]  org.scalameta:munit_2.13:0.7.29 requires scala version: 2.13.6
[WARNING] Multiple versions of scala libraries detected!
hello
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  6.812 s
[INFO] Finished at: 2022-06-15T00:00:39+10:00
[INFO] ------------------------------------------------------------------------

[slandelle]

Is it possible to build a fat jar with scala-maven-plugin? Similar to what maven-assembly-plugin does?

Well, just use use maven-assembly-plugin then. It would work just fine.

[rsibanez89]

Thanks again @slandelle, my goal was to use the scala-maven-plugin for CI/CD. Building and packaging in one machine, and then running it on the other machine, without trying to compile again. Is it possible to build a fat jar with scala-maven-plugin? Similar to what maven-assembly-plugin does?

# build an package in one agent
mvn package

# running it in production machine
java -jar target/scala-docker-example-1.0.0-jar-with-dependencies.jar

Maybe that is not the goal of the scala-maven-plugin. The scala-maven-plugin is just for local development?

Sorry these basics questions, I’m new to scala.