Grails Spring Batch plugin not finding jobs - spring

Question

I'm working on a project with Grails 3.3.7 and I'm trying to get the Spring Batch to work using the grails-spring-batch. Just like in the documentation example, I created a MySimpleJobBatchConfig.groovy file in the grails-app/batch directory with the following content :
import myapp.PrintMessageTasklet;
beans {
xmlns batch:"http://www.springframework.org/schema/batch"
batch.job(id: 'mySimpleJob') {
batch.step(id: 'logStart') {
batch.tasklet(ref: 'printMessage')
}
}
printMessage(PrintMessageTasklet) { bean ->
bean.autowire = "byName"
}
}
PrintMessageTasklet is defined as such in src/main/groovy/myapp/PrintMessageTasklet.groovy :
package myapp
import org.springframework.batch.core.StepContribution
import org.springframework.batch.core.scope.context.ChunkContext
import org.springframework.batch.core.step.tasklet.Tasklet
import org.springframework.batch.repeat.RepeatStatus
class PrintMessageTasklet implements Tasklet {
RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) {
println "Test"
return RepeatStatus.FINISHED
}
}
And here's the service that's trying to launch the job in grails-app/services/myapp/SimpleJobService :
package myapp
import grails.gorm.transactions.Transactional
import org.springframework.batch.core.JobParameters
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing
#Transactional
class SimpleJobService {
def jobLauncher;
def mySimpleJob;
def launchSimpleJob() {
jobLauncher.run(mySimpleJob, new JobParameters())
}
}
However, when I run launchSimpleJob, I get the following exception telling me that mySimpleJob is null, despite me having defined it in the MySimpleJobBatchConfig.groovy file.
java.lang.reflect.InvocationTargetException: null
at org.grails.core.DefaultGrailsControllerClass$ReflectionInvoker.invoke(DefaultGrailsControllerClass.java:211)
at org.grails.core.DefaultGrailsControllerClass.invoke(DefaultGrailsControllerClass.java:188)
at org.grails.web.mapping.mvc.UrlMappingsInfoHandlerAdapter.handle(UrlMappingsInfoHandlerAdapter.groovy:90)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
at org.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:77)
at org.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:67)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.IllegalArgumentException: The Job must not be null.
at org.springframework.util.Assert.notNull(Assert.java:134)
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:94)
at myapp.SimpleJobService.$tt__launchSimpleJob(SimpleJobService.groovy:14)
at grails.gorm.transactions.GrailsTransactionTemplate$2.doInTransaction(GrailsTransactionTemplate.groovy:94)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
at grails.gorm.transactions.GrailsTransactionTemplate.execute(GrailsTransactionTemplate.groovy:91)
at myapp.SimpleJobController.launch(SimpleJobController.groovy:9)
... 14 common frames omitted
If I try to start my job using springBatchService.launch('mySimpleJob') instead, the message in the returned map also tells me that it couldn't find the job named "mySimpleJob".
Since I'm quite new to Groovy and Spring Batch and I followed carefully the documentation of this plugin I can't find what's wrong. Does anyone knows how to fix this ?

Answer 1

Fixed it, the plugin documentation was outdated, turns out my BatchConfing needed to be in the src/main/resources/batch folder instead of the grails-app/batch folder.
Also had to change #Transactional to #Transactional(propagation = Propagation.NOT_SUPPORTED) in my service.