Java Spring集成-JDBC轮询器

我正在尝试使用SpringIntegration进行POC，以轮询数据库中的数据并相应地执行操作。下面的代码能够从数据库中获取数据并从有效负载中读取信息。但是，程序正在抛出错误，原因是“：java.lang.IllegalArgumentException:消息负载必须是表达式实例或表达式字符串。”

如果你能帮上忙，我真的很感激。谢谢

集成主类：

@Configuration
@EnableIntegration
public class SourceListener {

@Bean(name = PollerMetadata.DEFAULT_POLLER)
@Description("Default poller used by file sources")
public PollerMetadata poller() {
    return Pollers.fixedDelay(20, TimeUnit.SECONDS).get();


}
    @Bean
    @InboundChannelAdapter(value = "JDBCInputChannel", autoStartup = "false",poller = @Poller(fixedDelay="5000"))
    public MessageSource<Object> storedProc() {
        JdbcPollingChannelAdapter jdbcPollingChannelAdapter= new JdbcPollingChannelAdapter(dataSource()
                , "SELECT * FROM job limit 1");
        jdbcPollingChannelAdapter.setMaxRows(1);
        jdbcPollingChannelAdapter.setUpdatePerRow(true);
        jdbcPollingChannelAdapter.setUpdateSql("update job set job_id=2");
       jdbcPollingChannelAdapter.setRowMapper(new JobMapper());

        return jdbcPollingChannelAdapter;

    }

    @Bean(name = "controlChannel")
    @Description("Syncronous channel to send commands to the control bus")
    public MessageChannel controlBusChannel() {
        return new DirectChannel();
    }

    @Bean
    @Description("Control Bus used to start and stop the file sources")
    public IntegrationFlow controlBusFlow() {
        return IntegrationFlows.from(controlBusChannel()).controlBus().get();
    }

    @Bean
    public IntegrationFlow controlBusFlowJob() {

        return IntegrationFlows.from(storedProc()).controlBus()
                .get();
    }


    public DataSource dataSource(){
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setPassword("password");
        dataSource.setUrl("jdbc:postgresql://localhost:5000/postgres");
        dataSource.setUsername("postgres");
        return dataSource;
    }

    @Bean
    public MessageChannel JDBCInputChannel() {
        return new DirectChannel();
    }

    @Bean
    public IntegrationFlow sink() {
        return IntegrationFlows.from(JDBCInputChannel())
                .handle(message ->{
                    List<Job> stringlist=(List<Job>) message.getPayload();
                    for(Job str:stringlist)
                        System.out.println(str.getJob_id());

                })
                .get();

    }
}

public class Job {
    private long job_id;

    public Job() {
    }

    public Job(long job_id) {
        this.job_id = job_id;
    }

    public long getJob_id() {
        return job_id;
    }

    public void setJob_id(long job_id) {
        this.job_id = job_id;
    }

    @Override
    public String toString() {
        return "job_id=" + job_id;
    }
}

public class JobMapper implements RowMapper {
    @Override
    public Object mapRow(ResultSet resultSet, int i) throws SQLException {
        return new Job(Long.parseLong(resultSet.getString("job_id")));

    }
}

映射器类：

@Configuration
@EnableIntegration
public class SourceListener {

@Bean(name = PollerMetadata.DEFAULT_POLLER)
@Description("Default poller used by file sources")
public PollerMetadata poller() {
    return Pollers.fixedDelay(20, TimeUnit.SECONDS).get();


}
    @Bean
    @InboundChannelAdapter(value = "JDBCInputChannel", autoStartup = "false",poller = @Poller(fixedDelay="5000"))
    public MessageSource<Object> storedProc() {
        JdbcPollingChannelAdapter jdbcPollingChannelAdapter= new JdbcPollingChannelAdapter(dataSource()
                , "SELECT * FROM job limit 1");
        jdbcPollingChannelAdapter.setMaxRows(1);
        jdbcPollingChannelAdapter.setUpdatePerRow(true);
        jdbcPollingChannelAdapter.setUpdateSql("update job set job_id=2");
       jdbcPollingChannelAdapter.setRowMapper(new JobMapper());

        return jdbcPollingChannelAdapter;

    }

    @Bean(name = "controlChannel")
    @Description("Syncronous channel to send commands to the control bus")
    public MessageChannel controlBusChannel() {
        return new DirectChannel();
    }

    @Bean
    @Description("Control Bus used to start and stop the file sources")
    public IntegrationFlow controlBusFlow() {
        return IntegrationFlows.from(controlBusChannel()).controlBus().get();
    }

    @Bean
    public IntegrationFlow controlBusFlowJob() {

        return IntegrationFlows.from(storedProc()).controlBus()
                .get();
    }


    public DataSource dataSource(){
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setPassword("password");
        dataSource.setUrl("jdbc:postgresql://localhost:5000/postgres");
        dataSource.setUsername("postgres");
        return dataSource;
    }

    @Bean
    public MessageChannel JDBCInputChannel() {
        return new DirectChannel();
    }

    @Bean
    public IntegrationFlow sink() {
        return IntegrationFlows.from(JDBCInputChannel())
                .handle(message ->{
                    List<Job> stringlist=(List<Job>) message.getPayload();
                    for(Job str:stringlist)
                        System.out.println(str.getJob_id());

                })
                .get();

    }
}

public class Job {
    private long job_id;

    public Job() {
    }

    public Job(long job_id) {
        this.job_id = job_id;
    }

    public long getJob_id() {
        return job_id;
    }

    public void setJob_id(long job_id) {
        this.job_id = job_id;
    }

    @Override
    public String toString() {
        return "job_id=" + job_id;
    }
}

public class JobMapper implements RowMapper {
    @Override
    public Object mapRow(ResultSet resultSet, int i) throws SQLException {
        return new Job(Long.parseLong(resultSet.getString("job_id")));

    }
}

错误：

2020-10-03 13:55:45.579  INFO 20400 --- [           main] c.hds.jobmonitor.JobmonitorApplication   : Starting JobmonitorApplication on Gokulanath-Lap with PID 20400 (C:\Users\GRajasubramaniam\Downloads\jobmonitor\target\classes started by GRajasubramaniam in C:\Users\GRajasubramaniam\Downloads\jobmonitor)
2020-10-03 13:55:45.581  INFO 20400 --- [           main] c.hds.jobmonitor.JobmonitorApplication   : No active profile set, falling back to default profiles: default
2020-10-03 13:55:46.096  INFO 20400 --- [           main] faultConfiguringBeanFactoryPostProcessor : No bean named 'errorChannel' has been explicitly defined. Therefore, a default PublishSubscribeChannel will be created.
2020-10-03 13:55:46.104  INFO 20400 --- [           main] faultConfiguringBeanFactoryPostProcessor : No bean named 'integrationHeaderChannelRegistry' has been explicitly defined. Therefore, a default DefaultHeaderChannelRegistry will be created.
2020-10-03 13:55:46.175  INFO 20400 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'integrationChannelResolver' of type [org.springframework.integration.support.channel.BeanFactoryChannelResolver] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-10-03 13:55:46.179  INFO 20400 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'integrationDisposableAutoCreatedBeans' of type [org.springframework.integration.config.annotation.Disposables] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-10-03 13:55:46.190  INFO 20400 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.integration.config.IntegrationManagementConfiguration' of type [org.springframework.integration.config.IntegrationManagementConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-10-03 13:55:46.814  INFO 20400 --- [           main] o.s.s.c.ThreadPoolTaskScheduler          : Initializing ExecutorService 'taskScheduler'
2020-10-03 13:55:46.978  INFO 20400 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : Adding {logging-channel-adapter:_org.springframework.integration.errorLogger} as a subscriber to the 'errorChannel' channel
2020-10-03 13:55:46.978  INFO 20400 --- [           main] o.s.i.channel.PublishSubscribeChannel    : Channel 'application.errorChannel' has 1 subscriber(s).
2020-10-03 13:55:46.978  INFO 20400 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : started bean '_org.springframework.integration.errorLogger'
2020-10-03 13:55:46.978  INFO 20400 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : Adding {service-activator} as a subscriber to the 'controlChannel' channel
2020-10-03 13:55:46.978  INFO 20400 --- [           main] o.s.integration.channel.DirectChannel    : Channel 'application.controlChannel' has 1 subscriber(s).
2020-10-03 13:55:46.978  INFO 20400 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : started bean 'controlBusFlow.org.springframework.integration.config.ConsumerEndpointFactoryBean#0'; defined in: 'class path resource [com/hds/jobmonitor/listener/SourceListener.class]'; from source: 'bean method controlBusFlow'
2020-10-03 13:55:46.979  INFO 20400 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : Adding {service-activator} as a subscriber to the 'controlBusFlowJob.channel#0' channel
2020-10-03 13:55:46.979  INFO 20400 --- [           main] o.s.integration.channel.DirectChannel    : Channel 'application.controlBusFlowJob.channel#0' has 1 subscriber(s).
2020-10-03 13:55:46.979  INFO 20400 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : started bean 'controlBusFlowJob.org.springframework.integration.config.ConsumerEndpointFactoryBean#0'; defined in: 'class path resource [com/hds/jobmonitor/listener/SourceListener.class]'; from source: 'bean method controlBusFlowJob'
2020-10-03 13:55:46.979  INFO 20400 --- [           main] o.s.integration.channel.DirectChannel    : Channel 'application.JDBCInputChannel' has 1 subscriber(s).
2020-10-03 13:55:46.979  INFO 20400 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : started bean 'sink.org.springframework.integration.config.ConsumerEndpointFactoryBean#0'; defined in: 'class path resource [com/hds/jobmonitor/listener/SourceListener.class]'; from source: 'bean method sink'
2020-10-03 13:55:46.981  INFO 20400 --- [           main] o.s.i.e.SourcePollingChannelAdapter      : started bean 'controlBusFlowJob.org.springframework.integration.config.SourcePollingChannelAdapterFactoryBean#0'; defined in: 'class path resource [com/hds/jobmonitor/listener/SourceListener.class]'; from source: 'bean method controlBusFlowJob'
2020-10-03 13:55:46.987  INFO 20400 --- [           main] o.s.i.e.SourcePollingChannelAdapter      : started bean 'sourceListener.storedProc.inboundChannelAdapter'
2020-10-03 13:55:46.995  INFO 20400 --- [           main] c.hds.jobmonitor.JobmonitorApplication   : Started JobmonitorApplication in 1.73 seconds (JVM running for 2.029)
2020-10-03 13:55:47.113 ERROR 20400 --- [   scheduling-1] o.s.integration.handler.LoggingHandler   : org.springframework.messaging.MessageHandlingException: error occurred in message handler [ServiceActivator for [org.springframework.integration.handler.ExpressionCommandMessageProcessor@12e8cf1] (controlBusFlowJob.org.springframework.integration.config.ConsumerEndpointFactoryBean#0)]; nested exception is java.lang.IllegalArgumentException: Message payload must be an Expression instance or an expression String., failedMessage=GenericMessage [payload=[job_id=2], headers={id=1a039c0c-daae-f70e-aad8-8e3421028a5c, timestamp=1601704547110}]
    at org.springframework.integration.support.utils.IntegrationUtils.wrapInHandlingExceptionIfNecessary(IntegrationUtils.java:191)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:187)
    at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:115)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:133)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:106)
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:453)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:403)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:187)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:166)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:47)
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:109)
    at org.springframework.integration.endpoint.SourcePollingChannelAdapter.handleMessage(SourcePollingChannelAdapter.java:234)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.messageReceived(AbstractPollingEndpoint.java:396)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:380)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.pollForMessage(AbstractPollingEndpoint.java:328)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.lambda$null$1(AbstractPollingEndpoint.java:275)
    at org.springframework.integration.util.ErrorHandlingTaskExecutor.lambda$execute$0(ErrorHandlingTaskExecutor.java:57)
    at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50)
    at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:55)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.lambda$createPoller$2(AbstractPollingEndpoint.java:272)
    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
    at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    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:748)
Caused by: java.lang.IllegalArgumentException: Message payload must be an Expression instance or an expression String.
    at org.springframework.integration.handler.ExpressionCommandMessageProcessor.processMessage(ExpressionCommandMessageProcessor.java:92)
    at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:95)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:127)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:170)
    ... 28 more