如何在SpringBoot下关闭JPA for SpringBatch(How to turn off JPA for SpringBatch under SpringBoot)

 我们有一个使用Spring Integration和Spring Batch的Spring Boot应用程序。 我们在轮询器中放置一个文件并处理它。 该过程将记录插入到数据库中，然后将它们读出来进行一些处理并写入文件。 假设有10条记录。 我们第一次读取10条记录并写入10条记录。 在不停止服务器的情况下，我们通过数据库上的SQL客户端删除所有记录，再次运行相同的文件，我们得到10条记录，其中20条记录被读取。 我相信有一些JPA或缓存与数据源进行。 我们已经尝试关闭JPA和缓存的几个自动配置选项，但是我们没有找到正确的配置选项来关闭缓存。 
 
 为问题添加更多细节。 
 
 基本上我们有cron调度器，它有一个FileHandler。 这个handleFile方法我们有以下几点。 
 
public File handleFile(File file) throws Throwable {
    JobParametersBuilder jobParametersBuilder = new JobParametersBuilder();
    Job job = (Job) appContext.getBean("processInitialFileJob");
    JobExecution jb = jobLauncher.run(job, jobParametersBuilder.toJobParameters());
    ....
}
 
 我们可以对上面的代码做些什么来确保它具有新的JPA会话或根本不使用JPA会话？ 这项工作需要每次从数据库读取，而不是数据库的缓存表示。 

We have a Spring Boot application that uses Spring Integration and Spring Batch. We drop a file in the poller and it processes. This process inserts records into a database and then reads them back out does some processing and writes a file. Let's say there are 10 records. The first time we get 10 records read and 10 written. Without stopping the server, we delete all the records through a SQL client on the database, run the same file again and we get 10 records read with 20 written. I believe there is some JPA or caching going on with the datasource. We've tried turning off several auto configuration options for JPA and caching but we haven't found the right configuration option to turn off caching.
 
Adding a bit more detail to the question.
 
Basically we have cron scheduler that has a FileHandler. This the handleFile methods we have the following.
 
public File handleFile(File file) throws Throwable {
    JobParametersBuilder jobParametersBuilder = new JobParametersBuilder();
    Job job = (Job) appContext.getBean("processInitialFileJob");
    JobExecution jb = jobLauncher.run(job, jobParametersBuilder.toJobParameters());
    ....
}
 
What can we do to the code above to ensure that it has a new JPA session or not use the JPA session at all? This job needs to read from the database each time and not a cached representation of the database.

原文：https://stackoverflow.com/questions/43374433