Session bean

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posted 19 years ago

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Hi,

can any one tell me what will happen if we use class variable in stateful session bean instead of instance variable. what about stateless bean.

Thanks
ARathi

Anand Ko

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posted 19 years ago

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life of the variable will be that of the bean (for both stateless or stateful). I guess, u need to take care of the state if u are going to use.

Anand<br />SCJP 1.4, SCWCD 1.4, SCEA 5.0(1/3)

Nicholas Cheung

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posted 19 years ago

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You can use class variables instead of instance variables when you want to have overall information for the bean. For example, the number of times that the beans being created or activated, etc.

But as others said, you must be very sure about the state/data of the bean, otherwise, it is very easy for the data to be corrupted.

Nick

SCJP 1.2, OCP 9i DBA, SCWCD 1.3, SCJP 1.4 (SAI), SCJD 1.4, SCWCD 1.4 (Beta), ICED (IBM 287, IBM 484, IBM 486), SCMAD 1.0 (Beta), SCBCD 1.3, ICSD (IBM 288), ICDBA (IBM 700, IBM 701), SCDJWS, ICSD (IBM 348), OCP 10g DBA (Beta), SCJP 5.0 (Beta), SCJA 1.0 (Beta), MCP(70-270), SCBCD 5.0 (Beta), SCJP 6.0, SCEA for JEE5 (in progress)

Soni Prasad

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posted 19 years ago

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But according to specifications:
"An enterprise Bean must not use read/write static fields. Using read-only static fields is allowed. Therefore, it is recommended that all static fields in the enterprise bean class be declared as final."

Then how can one use class variables(Static variables) in EJBs. Am I confused

SCJP 1.4, SCBCD 1.3

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