To make the application work, simply configure the data source reference of Customer BMP EJB with the REPEATABLE_READ transaction isolation level.

要让应用程序工作，只需用REPEATABLE_READ事务隔离级别来配置Customer BMP EJB的数据源引用。

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Isolation: JPA 1.0 doesn't support custom isolation levels, so developers are required to specify the default transaction isolation level on the database side.

isolation： JPA 1.0不支持自定义隔离级别，因此开发人员需要指定数据库端的默认事务隔离级别。

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Follow the steps in transaction isolation level setting for a data source reference to change the transaction isolation level to REPEATABLE_READ, and run the application again.

遵循为数据源引用设置事务隔离级别中的步骤将事务隔离级别更改为REPEATABLE_READ，然后再次运行该应用程序。

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