What is an App Server?

I recently came across an interesting article on TSS aptly titled "What is an App Server?"

The traditional mindset has been, App Server = J2EE App Server, but that is changing now. As mentioned in that article,"an application server provides an environment where applications can run, no matter what the applications are or what they do"

Some people have been questioning whether it is correct to call WSAS an App Server since it does not support any of the JEE(J2EE) specs. This article on TSS should provide good answers to their questions.

System calls to Linux kernel

System call provides an interface to user-space processes to interact with kernel. This interface gives applications to access hardware and other operating system resources. This article gives you a good introduction to implement system calls in i 386 architecture.

It seems that _syscallX macros have been removed from "unistd.h". Hence, we have to use syscall available from libc.

Running WSAS on WebLogic

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Amila has written a blog post about running WSAS on WebLogic. WebLogic uses its own StAX parser implementation. Due to some issues in the way Axiom uses the underlying StAX parsers, some of the functionality did not work properly when WSAS or Axis2 were deployed on WebLogic. Now, Amila has fixed Axiom so to handle this issue. For more details, see Amila's blog post.