Existing transaction detected in JobRepository - Spring Batch with Grails Plugin - grails

Question

Every time I start my batch job it throws an IllegalStateException and says it detected a transaction in JobRepository. I did some research and removed all #Transactional annotations in my code.
I use the Grails Spring Batch Plugin you can find here, and I work with Grails 2.3.11 and Java 8. My code looks like this:
SimpleJobBatchConfig.groovy
beans {
xmlns batch:"http://www.springframework.org/schema/batch"
batch.job(id: 'simpleJob') {
batch.step(id: 'printStep') {
batch.tasklet(ref: 'printHelloWorld')
}
}
printHelloWorld(SimpleJobTasklet) { bean ->
bean.autowire = 'byName'
}
}
BatchTestController.groovy
class BatchelorController {
def batchTestService
def index() {
}
def launchSimpleJob() {
batchTestService.launchSimpleJob()
}
}
BatchTestService.groovy
class BatchTestService {
def springBatchService
def launchSimpleJob() {
springBatchService.launch("simpleJob")
}
}
SimpleJobTasklet.groovy
class SimpleJobTasklet implements Tasklet {
#Override
RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
println("Hello World!")
return RepeatStatus.FINISHED
}
}

Answer 1

Grails services are transactional by default. You can customize the settings for the whole class or per-method with #Transactional but if you have no annotations it's the same as having a class-scope Spring #Transactional annotation.
To make your service non-transactional, add static transactional = false, e.g.
class BatchTestService {
static transactional = false
def springBatchService
...
}
}