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FAQ Entries in EJB

Should synchronization primitives be used on bean methods?
Can I use Threads in a enterprise bean?
Why are beans not allowed to create their own threads?
How does EJB support polymorphism?
What classes does a client application need to access EJB?
What's an .ear file?
Can beans use stored procedures in a database?
Is method overloading allowed in EJB?
How can JMS be used from EJB 1.1?
Is there a J2EE server for RedHat Linux 6.1?
How does Container Managed Persistence work with automatically generated database ID fields? Should I map the ID field explicitly or leave it unspecified?
How can one have non-client specific state in stateless session beans?
Let's assume I use a JavaBean as a go-between a JSP and an EJB, and have, say, 50 concurrent clients that need to access the EJB functionality. Will the JSP container actually instantiate 50 instances of the bean, or can it reuse a single instance to access the EJB?
What's the reason for having two interfaces -- EJBHome for creating, finding & removing and EJBObject for implementing business methods. Why not have an single interface which supports both areas of functionality?
Can a bean act as a singleton to provide logging and other services?
How do you implement callbacks in EJB?
How do you model for a JOIN operation in a relational database using entity bean(s)? Do you have to have separate entity beans for each table in the database?
How should singleton EJBs be implemented in a cluster ?
Are there any good examples of how to handle one-to-many, many-to-one, and many-to-many entity bean relationships?
Which IDEs are available that support EJB development? And are any free or low-cost?
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