Trying to integrate Spring Batch with spring integration getting error - spring-integration

Question

The below class is used to poll for a file in a directory and trigger the spring batch once a file is received in a directory. I am getting some error, which I am not able to figure out. please advice.
Also, if there is some sample code example to do the same, please refer me to that location.
#Configuration
class FilePollingIntegrationFlow {
#Autowired
private ApplicationContext applicationContext;
// this is the integration flow that foirst polls for messages and then trigger the spring batch job
#Bean
public IntegrationFlow inboundFileIntegration(#Value("${inbound.file.poller.fixed.delay}") long period,
#Value("${inbound.file.poller.max.messages.per.poll}") int maxMessagesPerPoll,
TaskExecutor taskExecutor,
MessageSource<File> fileReadingMessageSource,
JobLaunchingGateway jobLaunchingGateway) {
return IntegrationFlows.from(fileReadingMessageSource,
c -> c.poller(Pollers.fixedDelay(period)
.taskExecutor(taskExecutor)
.maxMessagesPerPoll(maxMessagesPerPoll)))
.transform(Transformers.fileToString())
.channel(ApplicationConfiguration.INBOUND_CHANNEL)
.handle((p, h) -> {
System.out.println("Testing:::::"+p);
return p;
})
.handle(fileMessageToJobRequest())
.handle(jobLaunchingGateway(),"toRequest")
.channel(MessageChannels.queue())
.get();
}
#Bean
public FileMessageToJobRequest fileMessageToJobRequest() {
FileMessageToJobRequest fileMessageToJobRequest = new FileMessageToJobRequest();
fileMessageToJobRequest.setFileParameterName("input.file.name");
// fileMessageToJobRequest.setJob(personJob());
System.out.println("FilePollingIntegrationFlow::fileMessageToJobRequest::::Job launched successfully!!!");
return fileMessageToJobRequest;
}
#Bean
public JobLaunchingGateway jobLaunchingGateway() {
SimpleJobLauncher simpleJobLauncher = new SimpleJobLauncher();
// simpleJobLauncher.setJobRepository(jobRepository);
simpleJobLauncher.setTaskExecutor(new SyncTaskExecutor());
JobLaunchingGateway jobLaunchingGateway = new JobLaunchingGateway(simpleJobLauncher);
System.out.println("FilePollingIntegrationFlow::jobLaunchingGateway::::Job launched successfully!!!");
return jobLaunchingGateway;
}
//This is another class used for batch job trigger
public class FileMessageToJobRequest {
private Job job;
private String fileParameterName;
public void setFileParameterName(String fileParameterName) {
this.fileParameterName = fileParameterName;
}
public void setJob(Job job) {
this.job = job;
}
#Transformer
public JobLaunchRequest toRequest(Message<File> message) {
JobParametersBuilder jobParametersBuilder =
new JobParametersBuilder();
jobParametersBuilder.addString(fileParameterName,
message.getPayload().getAbsolutePath());
return new JobLaunchRequest(job, jobParametersBuilder.toJobParameters());
}
}
I am getting the below error:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'inboundFileIntegration' defined in class path resource [com/porterhead/integration/file/FilePollingIntegrationFlow.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.integration.dsl.IntegrationFlow]: Factory method 'inboundFileIntegration' threw exception; nested exception is java.lang.IllegalArgumentException: Target object of type [class org.springframework.batch.integration.launch.JobLaunchingGateway] has no eligible methods for handling Messages.
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766)
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:134)
at com.porterhead.Application.main(Application.java:23)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.integration.dsl.IntegrationFlow]: Factory method 'inboundFileIntegration' threw exception; nested exception is java.lang.IllegalArgumentException: Target object of type [class org.springframework.batch.integration.launch.JobLaunchingGateway] has no eligible methods for handling Messages.
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
... 16 common frames omitted
Caused by: java.lang.IllegalArgumentException: Target object of type [class org.springframework.batch.integration.launch.JobLaunchingGateway] has no eligible methods for handling Messages.
at org.springframework.integration.util.MessagingMethodInvokerHelper.findHandlerMethodsForTarget(MessagingMethodInvokerHelper.java:494)
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:226)
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:135)
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:139)
at org.springframework.integration.handler.MethodInvokingMessageProcessor.<init>(MethodInvokingMessageProcessor.java:52)
at org.springframework.integration.handler.ServiceActivatingHandler.<init>(ServiceActivatingHandler.java:45)
at org.springframework.integration.dsl.IntegrationFlowDefinition.handle(IntegrationFlowDefinition.java:982)
at org.springframework.integration.dsl.IntegrationFlowDefinition.handle(IntegrationFlowDefinition.java:964)
at com.porterhead.integration.file.FilePollingIntegrationFlow.inboundFileIntegration(FilePollingIntegrationFlow.java:85)
at com.porterhead.integration.file.FilePollingIntegrationFlow$$EnhancerBySpringCGLIB$$c1cfa1e9.CGLIB$inboundFileIntegration$1(<generated>)
at com.porterhead.integration.file.FilePollingIntegrationFlow$$EnhancerBySpringCGLIB$$c1cfa1e9$$FastClassBySpringCGLIB$$4ce6110e.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356)
at com.porterhead.integration.file.FilePollingIntegrationFlow$$EnhancerBySpringCGLIB$$c1cfa1e9.inboundFileIntegration(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
... 17 common frames omitted
Please advice.

Answer 1

Since your FileMessageToJobRequest.toRequest() is marked with the #Transformer you should consider to use .transform() instead.
Also I see that you use that toRequest method name for the JobLaunchingGateway what is definitely wrong. So, the proper way to go is like this:
.transform(fileMessageToJobRequest())
.handle(jobLaunchingGateway())
The sample you are looking for is in the Spring Batch Reference Manual.