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The Apache HTTP Server, also known as httpd , has been the most popular web server on the Internet since April of 1996. It is both free and robust and that's the reason that almost half of the world's websites runs on Apache HTTP web server, ranging from small hobby websites to huge e-commerce giants and big banks. There are also many companies which use Apache and Tomcat to host Java web application. In a typical setup, Apache web server receives the HTTP request and depending upon the URL it either route to Tomcat or serve the static files directly from the file system. These questions are based mostly on that experience. Though Apache is not just famous in Java world it is even more popular with other web technologies e.g. Perl, PHP, and MySQL. It's one of the powerful and secure web servers so anyone can use it to handle HTTP traffic. It supports both HTTP and HTTPS . It's worth noting that Apache is also an HTTP/1.1 compliant web server. Read more �

Increasing Heap size of Tomcat You can increase heap size of Tomcat by setting JAVA_OPTS or CATALINA_OPTS at the top of the catalina.sh , file if you are running Tomcat in Linux and by putting JAVA_OPTS or CATALINA_OPTS into the catalina.bat file if you are running Tomcat in Windows. This approach will work irrespective of tomcat version i.e. you can increase the heap memory of tomcat 5.5, tomcat 6, tomcat 7 and even tomcat 8 by using this technique. You can find the catalina.sh and catalina.bat file in the bin directory of tomcat installation folder e.g. in my machine catalina.sh and the catalina.bat file is located under C:\Program Files\Apache Software Foundation\Apache Tomcat 7.0.41\bin directory. If you open the catalina.bat property you will see the advice given by Tomcat creator itself on how to give additional JVM options to Tomcat process. Read more �

You can find Tomcat and java version running on Linux either by executing the org.apache.catalina.util.ServerInfo class from catalina.jar or by executing version.sh shell script. The first solution will work on any operating system including Windows and UNIX because it's using a Java class from a catalina.jar file, which is platform independent. Though, if you don't know how to run a class from JAR file, you can check the steps here . Alternatively, you also have a version.bat file inside tomcat/bin directory to check the version of Tomcat in Windows. When you run this script in Linux or Windows it prints information about tomcat version, the java version used to run tomcat, Server built date, OS name, OS Version, architecture, JVM version and JVM vendor etc. Read more �