如何在付款期结束后找到下周五(How to find the following Friday after a pay period ends)

 在探索EclipseLink源代码后，我发现存储在持久化上下文（隔离缓存）中的对象位于名为identityMaps的映射中，每个实体类都有一个存储该类型所有对象的映射。 
 
 您可以使用以下方法打印地图的内容： 
 
public interface IdentityMapAccessor {
    /**
     * PUBLIC:
     * Used to print all the Objects in the identity map of the given Class type.
     * The output of this method will be logged to this session's SessionLog at SEVERE level.
     */
    public void printIdentityMap(Class theClass);

    /**
     * PUBLIC:
     * Used to print all the Objects in every identity map in this session.
     * The output of this method will be logged to this session's SessionLog at SEVERE level.
     */
    public void printIdentityMaps();
}
 
 例子： 
 
((JpaEntityManager) entityManager.getDelegate())
            .getActiveSession()
            .getIdentityMapAccessor()
            .printIdentityMaps();
((JpaEntityManager) entityManager.getDelegate())
            .getActiveSession()
            .getIdentityMapAccessor()
            .printIdentityMap(MyClass.class);

After exploring the EclipseLink source code I found that the objects stored in the persistence context (isolated cache) are located in a maps called identityMaps for each entity class there is a map which stores all the objects of that type.
 
You can print the contents of the map using the following methods:
 
public interface IdentityMapAccessor {
    /**
     * PUBLIC:
     * Used to print all the Objects in the identity map of the given Class type.
     * The output of this method will be logged to this session's SessionLog at SEVERE level.
     */
    public void printIdentityMap(Class theClass);

    /**
     * PUBLIC:
     * Used to print all the Objects in every identity map in this session.
     * The output of this method will be logged to this session's SessionLog at SEVERE level.
     */
    public void printIdentityMaps();
}
 
Examples:
 
((JpaEntityManager) entityManager.getDelegate())
            .getActiveSession()
            .getIdentityMapAccessor()
            .printIdentityMaps();
((JpaEntityManager) entityManager.getDelegate())
            .getActiveSession()
            .getIdentityMapAccessor()
            .printIdentityMap(MyClass.class);