Spring VS ejb

Plain transaction is complicate:

beginTransaction
run function
if(error) rollback;
endTransaction

We have ejb to simplify the transaction code:

• ejb has session bean, to simplify the transaction codes, can do declare service
• But cannot run in Tomcat
• ejb can run in jboss and weblogic
• ejb is not POJO

Why Spring

• Lite weight
• Can run in Tomcat
• Spring can take over the function of ejb's session bean, declare service
• Spring can replace part functions of ejb

But ejb has much better performance on distributed system than Spring