$ sudo apt-get update
$ sudo apt-get install libservlet2.5-java 

libservlet2.5-java is installed in your system.

Make ensure the libservlet2.5-java package were installed using the commands given below,

$ sudo dpkg-query -l | grep libservlet2.5-java *

You will get with libservlet2.5-java package name, version, architecture and description in a table

libservlet2.5-java package basic information: