Add a warning when re-augmenting non-mutable Quarkus application

[rsvoboda]

Description

The proper flow to re-augment your application with a different build time configuration is

mvn clean install -Dquarkus.package.type=mutable-jar
java -Dquarkus.launch.rebuild=true -Dfoo=bar -jar target/quarkus-app/quarkus-run.jar

But one can easily forget to add -Dquarkus.package.type=mutable-jar when building the app.

In that case the error complains about NSFE for deployment-class-path.dat and the log looks like this:

java -Dquarkus.launch.rebuild=true -jar target/quarkus-app/quarkus-run.jar 
Exception in thread "main" java.nio.file.NoSuchFileException: /Users/rsvoboda/Downloads/code-with-quarkus/target/quarkus-app/lib/deployment/deployment-class-path.dat
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
	at java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:218)
	at java.base/java.nio.file.Files.newByteChannel(Files.java:380)
	at java.base/java.nio.file.Files.newByteChannel(Files.java:432)
	at java.base/java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:422)
	at java.base/java.nio.file.Files.newInputStream(Files.java:160)
	at io.quarkus.bootstrap.runner.QuarkusEntryPoint.doReaugment(QuarkusEntryPoint.java:72)
	at io.quarkus.bootstrap.runner.QuarkusEntryPoint.doRun(QuarkusEntryPoint.java:48)
	at io.quarkus.bootstrap.runner.QuarkusEntryPoint.main(QuarkusEntryPoint.java:32)

Implementation ideas

Add more clear error message saying that re-augmentation was requested, but the application wasn't built with quarkus.package.type=mutable-jar

[geoand]

Sounds reasonable. @rsvoboda would you like to update the error message?

[rsvoboda]

Sure. I will adjust https://github.com/quarkusio/quarkus/blob/main/independent-projects/bootstrap/runner/src/main/java/io/quarkus/bootstrap/runner/QuarkusEntryPoint.java#L69 to first check if the file exists.

In case it doesn't exist, error message to be printed and return from the method immediately. Sounds good @geoand ?

[geoand]

👌