I am currently trying to get QueryDSL running with Scala in Gradle. To generate the required Q-objects I built the following task: task gen << {
def exporter = new GenericExporter()
exporter.setKeywords(Keywords.JPA);
exporter.setTargetFolder(new java.io.File("${buildDir}/generated/scala"))
exporter.setSerializerClass(ScalaEntitySerializer.class)
exporter.setTypeMappingsClass(ScalaTypeMappings.class)
exporter.setEntityAnnotation(Entity.class);
exporter.setEmbeddableAnnotation(Embeddable.class);
exporter.setEmbeddedAnnotation(Embedded.class);
exporter.setSupertypeAnnotation(MappedSuperclass.class);
exporter.setSkipAnnotation(Transient.class);
exporter.setCreateScalaSources(true)
exporter.export(“de”) }
classes.dependsOn(gen)
Problem is that it has to run after things have already been built because GenericExporter is analyzing the generated byte code. How can I tell Gradle to build the Scala-Files the task will generate?
You’ll have to add a task of type ScalaCompile and configure it as necessary.
Thanks for the quick reply. Got it working during my lunch-break 
I got it working using: task compileGenerated(type: ScalaCompile) {
source = file("${buildDir}/generated/scala")
destinationDir = new File("${buildDir}/classes/generated")
scalaCompileOptions.incrementalOptions.analysisFile = new File("${buildDir}/tmp/scala/compilerAnalysis/compileCustomScala.analysis")
classpath = buildscript.configurations.classpath }
compileGenerated.dependsOn(gen) classes.dependsOn(compileGenerated)
The final problem I have is now the order of tasks. I expected compileGenerated to be executed right before classes doing ‘gradle clean build’. Instead I got the following order: :entity:clean :entity:gen UP-TO-DATE :entity:compileGenerated UP-TO-DATE :entity:compileJava UP-TO-DATE :entity:compileScala :entity:processResources :entity:classes :entity:jar :entity:assemble :entity:compileTestJava UP-TO-DATE :entity:compileTestScala UP-TO-DATE :entity:processTestResources UP-TO-DATE :entity:testClasses UP-TO-DATE :entity:test :entity:check :entity:build
So compileGenerated gets executed before compileScala. How can I get my compileGenerated-task to execute at the right moment?
Got it, but is it the right thing to do?: task compileGenerated(type: ScalaCompile) {
outputs.upToDateWhen {
return false
}
source = file("${buildDir}/generated/scala")
destinationDir = new File("${buildDir}/classes/generated")
scalaCompileOptions.incrementalOptions.analysisFile = new File("${buildDir}/tmp/scala/compilerAnalysis/compileCustomScala.analysis")
classpath = buildscript.configurations.classpath }
compileGenerated.dependsOn(gen) jar.dependsOn(compileGenerated)
You are missing a task dependency. I don’t know exactly how your tasks build on each other, but maybe it’s ‘gen.dependsOn(compileScala)’.
Not sure what exactly your question is about. The need for ‘upToDateWhen { false }’ is an indication that something might be configured incorrectly. Also you probably want to include the generated code in the Jar.
You gave me the correct line After inserting it I was also able to remove upToDateWhen { false }. Thanks a lot!