'Unable to compile class for JSP' error message occurs at runtime

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Problem
An "Unable to compile class for JSP" error is thrown at runtime. See the complete error message below.
org.apache.jasper.JasperException: Unable to compile class for JSP/usr//temp//WebSphere_Portal///genjsp/.java:: error while writing : /usr/ /temp//WebSphere_Portal///genjsp/.class (Too many open files)(source unavailable)

Cause
The exception above is thrown when the operating system (OS) and JVM run out of file descriptors. File descriptors are unique to processes to identify open files of different types, including sockets or pipes. Exceptions indicating too many open files are thrown when the OS runs short of file descriptors.

Solution
There is a ulimit parameter in Linux that controls the number of files/connections that can be opened. You can find the current ulimit setting by entering the following command (ulimit -n). Ensure that this is set to at least 8192.