Head First EJB

Comparing Remote vs. Local interfaces

The EJBObject and EJBHome interfaces have more methods than the EJBLocalObject and EJBLocalHome interfaces because there are methods that don’t make sense in a local context.

REMOTE client view

<<interface>> EJBHome

EJBMetaData getEJBMetaData()

HomeHandle getHomeHandle()

void remove(Handle h)

void remove(Object key)

<<interface>> EJBObject

Object getPrimaryKey()

EJBHome getEJBHome()

Handle getHandle()

void remove()

boolean isIdentical(EJBObject o)

LOCAL client view

Sharpen your pencil

Based on what you now know about the difference between local and Remote client interfaces, decide if the following statements are true or false. You’ll have to make some inferences and smart guesses for some of them.

Select all that are true:

	The only way to remove a local session bean is through the component interface
	Entity beans can be removed through a local home interface
	If you see an isIdentical() call, this must be a local bean
If you see a getHandle() call, this must be a Remote ...