Question

我试图每5秒轮询一次数据库，并希望获得过去5秒内创建/更新的所有记录。

这是代码块

@Bean
    public JpaExecutor jpaExecutor() {
        JpaExecutor executor = new JpaExecutor(this.entityManagerFactory);
        executor.setJpaQuery("from Product p where p.updateDttm >= :updateDttm");
        executor.setJpaParameters(Collections.singletonList(new JpaParameter("updateDttm", "2019-02-28 12:02:15.000", null)));
        return executor;
    }

这是我遇到的错误

ERROR 908 --- [ask-scheduler-8] o.s.integration.handler.LoggingHandler   : org.springframework.messaging.MessagingException: nested exception is java.lang.IllegalArgumentException: Query has parameters but no parameter source provided
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.pollForMessage(AbstractPollingEndpoint.java:343)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.lambda$null$1(AbstractPollingEndpoint.java:277)
    at org.springframework.integration.util.ErrorHandlingTaskExecutor.lambda$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$2(AbstractPollingEndpoint.java:274)
    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
    at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
    at java.util.concurrent.Executors$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: Query has parameters but no parameter source provided
    at org.springframework.integration.jpa.core.DefaultJpaOperations.setParametersIfRequired(DefaultJpaOperations.java:348)
    at org.springframework.integration.jpa.core.DefaultJpaOperations.getQuery(DefaultJpaOperations.java:117)
    at org.springframework.integration.jpa.core.DefaultJpaOperations.getResultListForQuery(DefaultJpaOperations.java:190)
    at org.springframework.integration.jpa.core.JpaExecutor.doPoll(JpaExecutor.java:569)
    at org.springframework.integration.jpa.core.JpaExecutor.poll(JpaExecutor.java:505)
    at org.springframework.integration.jpa.core.JpaExecutor.poll(JpaExecutor.java:476)
    at org.springframework.integration.jpa.inbound.JpaPollingChannelAdapter.doReceive(JpaPollingChannelAdapter.java:82)
    at org.springframework.integration.endpoint.AbstractMessageSource.receive(AbstractMessageSource.java:160)
    at org.springframework.integration.endpoint.SourcePollingChannelAdapter.receiveMessage(SourcePollingChannelAdapter.java:250)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:360)
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.pollForMessage(AbstractPollingEndpoint.java:329)

Answer 1

您的执行最终会遵循以下逻辑：

if (requestMessage == null) {
            result = doPoll(this.parameterSource, 0, maxNumberOfResults);
        }

您似乎没有配置this.parameterSource的地方。

可以通过以下方式进行配置：

/**
 * Specify the {@link ParameterSource} that would be used to provide
 * additional parameters.
 * @param parameterSource Must not be null.
 */
public void setParameterSource(ParameterSource parameterSource) {

但是，如果偏爱executor.setJpaParameters上的二传手，则需要放弃该BeanPropertyParameterSourceFactory.setStaticParameters()。 createParameterSource(null)可用于在 setParameterSource()。

我认为我们可以考虑在此问题上进行一些改进，以在内部构建JpaExecutor进行轮询，就像在进行出站操作时为ParameterSource所做的那样。

随时可以就此事提出GH问题。

与JPA的Spring集成返回错误：:查询具有参数，但未提供参数源

1 个答案: