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Remember that create() returns a reference to a remote interface, not the bean object itself. This means that certain programming practices that may be taken for granted in Java may not be used with EJBs. For example, objects are passed to EJBs via the arguments of the method calls and results are passed back to the client

{ float xDif = firstPoint.x - secondPoint.x; float yDif = firstPoint.y - secondPoint.y; return atan2(xDif, yDif); }

via the EJBs return object. It is not possible to maintain a reference to an input argument of an EJB, change that argument s values inside of the EJB, and then have access to those changes at the client.

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That is, it keeps the same form but now with the new radius R . That s the math of the transformation. The physics is that if we started with a theory with a small compacti ed dimension R, we have transformed to a dual theory with a large extra dimension R . What this means for the string is that a string in a type IIA theory (with small compacti ed dimension), which winds around the small compact dimension (with winding states) is dual to a string in type IIB theory (with the dimension transformed to a large dimension of radius R ), which has momentum along that dimension. Each time the string in type IIA theory winds around the compact dimension, this corresponds to increasing the momentum in type IIB theory by one unit. 25 25 Now let s examine how pL and pR , and by extension 0 and 0, transform under this symmetry. Recall Eq. (8.22) that states

Calling Session Bean Methods from a Client After all the components of a session bean have been created and a remote reference to the EJB is made available to a client, the exposed business methods of the EJBObject and the life cycle methods of the EJBHome are available to the client as if the EJB were local to that client. Coding Clients to Call EJBs After the session bean reference has been made available to a client, it is up to the client to instantiate the bean components through the bean s home interface. Only then can the business logic methods of the bean class be accessed via the exposed methods of the EJBObject. For Java Platform EE applications to run in an efficient and stable fashion, both client and server developers should adhere to standard programming policy practices and procedures, two of which are mentioned next. Session Beans, Reentrance, and Loop-Back Calls If a bean is allowed to invoke methods on itself or another bean that invokes methods on the initial bean, the initial bean is said to be reentrant. This type of self-accessing call is referred to as a loop-back call. As opposed to an entity bean, a session bean is never allowed to be reentrant. If a session bean attempts to make a loop-back, the EJB container should throw a java.rmi.RemoteException. Remove the Bean When Done When a client no longer has use for a session bean, it should remove the session object using the javax.ejb.EJBObject. remove() method or the javax.ejb.EJBHome.remove(Handle handle) method. If the javax.ejb.EJBHome.remove(Object primaryKey) method is called on a session by mistake, the javax.ejb.RemoveException will be thrown because session beans, unlike entity beans, do not have a primary key.

(1.9)

The EJB framework allows many different types of clients to instantiate EJBs and takes advantage of the business logic that they implement. For the rest of this section, examples of different types of clients calling a session bean will be presented along with some of the necessary tasks that must be completed to support these different clients. This section concentrates on how clients can be integrated with EJBs.

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