Head First EJB

Which APIs does EJB 2.0 guarantee?

Supported APIs

• Java 2 Standard Edition, v 1.3 (J2SE)

• JNDI API 1.2

• JTA 1.01 extension (the UserTransaction interface only)

• JDBC 2.0 extension

• JMS 1.02 extension

• JavaMail 1.1, sending mail only

• JAXP 1.0

Note

J2SE support is Java 1.3, NOT 1.4!

Just because an API is in the J2SE standard library for version 1.4, does not mean that API is guaranteed for EJB! The EJB spec requires only J2SE version 1.3, so if you write a bean that relies on something in J2SE 1.4, your bean is not guaranteed to be portable across any EJB 2.0 container.

That means, for example, that the Java Cryptography Extension (JCE) APIs are not guaranteed to be supported by EJB 2.0, even though they are now part of the J2SE platform as of version 1.4.

Relax

You don’t have to memorize all of the exact version numbers

The exam isn’t going to trick you on something as trivial as remember whether JavaMail is 1.1 or 1.2, or whether the JTA extension is 1.01 or 1.03. The only numbers you really need to know (besides the 2.0 in EJB 2.0!) are the JDBC 2.0 extension, and that only version 1.3 (not necessarily 1.4) of J2SE is guaranteed.

Sharpen your pencil

Without looking it up, write down what each of these APIs do. If you don’t know, take a good guess based on what you know about EJB.

We’ll start you off by giving you the most difficult one.

J2SE	___________________________________
JNDI	___________________________________
JTA	___________________________________
JDBC	___________________________________
JMS	___________________________________ ...