我正在使用Grails 3.3.7处理一个项目，我试图使用grails-spring-batch来使Spring Batch工作。就像文档示例中一样，我在grails-app/batch目录中创建了一个MySimpleJobBatchConfig.groovy文件，其中包含以下内容：

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"
    }
}

在src/main/groovy/myapp/PrintMessageTasklet.groovy中，PrintMessageTasklet的定义如下：

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
    }
}

下面是尝试在grails-app/services/myapp/SimpleJobService中启动作业的服务：

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())
    }
}

然而，当我运行launchSimpleJob时，我得到以下异常，告诉我mySimpleJob为空，尽管我已经在MySimpleJobBatchConfig.groovy文件中定义了它。

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

如果我尝试使用springBatchService.launch('mySimpleJob')来启动作业，则返回的Map中的消息也会告诉我，它找不到名为“mySimpleJob”的作业。
由于我是Groovy和Spring Batch的新手，我仔细地阅读了这个插件的文档，我找不到哪里有问题。有人知道如何修复这个问题吗？