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1.1 Invoking a local EJB from another EJB 4 1.1 Invoking a local EJB from another EJB 4 1.12 Improving your client-side EJB lookup code 31 2.1 Generating home, remote, local, and local home interfaces 37 2.7 Facilitating bean lookup with a utility object 58 7.6 Preventing access to entity data 239 Invoking a remote EJB from another EJB 6 1.2 Invoking a remote EJB from another EJB 6 1.12 Improving your client-side EJB lookup code 31 2.1 Generating home, remote, local, and local home interfaces 37 4.1 Retrieving an environment variable 134 Accessing EJBs from a servlet 8 1.4 Invoking an EJB from a JavaServer Page 12 1.12 Improving your client-side EJB lookup code 31 2.1 Generating home, remote, local, and local home interfaces 37 2.7 Facilitating bean lookup with a utility object 58 Invoking an EJB from a JavaServer Page 12 1.3 Accessing EJBs from a servlet 8 3.15 Creating an interface to your entity data 120 5.15 Holding a transaction across multiple JavaServer Pages 191 Invoking EJB business logic from a JMS system 15

Languages like C and Pascal have had enumerated data types for decades. Enumerations were finally introduced in Java 5. In case you are unfamiliar with them, we ll start with the basics. In listing 8.4, the user type field has a type of UserType. UserType is a Java enumeration that is defined as follows:

public enum UserType {SELLER, BIDDER, CSR, ADMIN};

1.5 1.6

With EJBs, the implementation of these methods is fairly simple since they only delegate to the Home interfaces. Note the use of the DBUtil.getNextTxId method (line 39), which makes the database identifier creation transparent to the POJOs when creating a new transaction. The references on the required Home interfaces are stored in noninitialized private attributes. The attributes can be initialized by the concrete aspects that implement this abstract one. Thus, the subaspects can implement session or entity EJB specificities, and must initialize the Homes. For instance, the POJOSession aspect performs this initialization in the ejbCreate method, as shown in Listing 11-13. Listing 11-13. EJB References Initialization in the POJOSession Aspect package aop.j2ee.business.aspect; [...] // imports public aspect POJOSession extends EJBResolver { declare parents: SessionBeanProtocol extends javax.ejb.SessionBean; [...] // see above for the other methods implementations public void SessionBeanProtocol.ejbCreate() { try { if(txHome==null) txHome = EJBGetter.getTxHome(); if(accountHome==null) accountHome = EJBGetter.getAccountHome(); } catch (Exception ex) {

This effectively means that any data type defined as UserType (like our persistent field in the User object) can only have the four values listed in the enumeration. Like an array, each element of the enumeration is associated with an index called the ordinal. For example, the UserType.SELLER value has an ordinal of 0, the UserType.BIDDER value has an ordinal of 1, and so on. The problem is determining how to store the value of enumerated data into the column. The Java Persistence API supports two options through the @Enumerated annotation. In our case, we specify that the ordinal value should be saved into the database:

@Enumerated(EnumType.ORDINAL) ... protected UserType userType;

Persisting a reference to an EJB instance 18 1.7 Retrieving and using a persisted EJB reference 20 1.8 Persisting a home object reference 21 Retrieving and using a persisted EJB reference 20 1.6 Persisting a reference to an EJB instance 18 1.8 Persisting a home object reference 21 Persisting a home object reference 21 1.6 Persisting a reference to an EJB instance 18 1.7 Retrieving and using a persisted EJB reference 20 1.12 Improving your client-side EJB lookup code 31 Comparing two EJB references for equality Using reflection with an EJB 25 23

This means that if the value of the field is set to UserType.SELLER, the value 0 will be stored into the database. Alternatively, you can specify that the enumeration value name should be stored as a String:

@Enumerated(EnumType.STRING) ... protected UserType userType;