removeParam
The removeParam method shall remove a configuration parameter either from the specified groupName or from the default groupName. It should return the value of the parameter that it removes.
Return
The removeParam method should return the value of the parameter that it removes.
Parameters
groupName
Group from which the configuration parameter is to be removed. Note: If groupName is null, then the default groupName shall be used.
paramName
Name of the configuration parameter.
Throws
This exception shall be thrown if paramName is null.