How To Install Tomcat on Ubuntu?

Recently, I started working on Ubuntu OS 14.04. I feel Ubuntu is much simpler than what I thought earlier. Lets leave about Ubuntu, I want to blog more about Ubuntu OS afterwards. Here I want to brief about how to install Tomcat webserver on Ubuntu. Apache Tomcat is an open source webserver where we can deploy java applications.

Go to terminal window on Ubuntu and login as a root user.

1. Install Java First:

Before installing Tomcat server, it is better to install Java. Run the following command on terminal window to check Java is already installed.

java -version

If it returns "The program 'java' can be found in the following packages:" the Java is not installed on Ubuntu. To install Java, just run the below command. After this we have to add Java to environment variables in .bashrc. We will add both Java and Tomcat after the installation of Tomcat webserver.

apt-get install default-jdk

2. Install Tomcat Webserver

There are two ways to install Tomcat in Ubuntu.

The first method is simply run the below command on terminal window.

apt-get install tomcat

The second method is installing tomcat from binaries. Click on Apache Tomcat7 Download site. The latest version of Tomcat is 7.0.63 as on July 2015. Just right click on tar.gz under Core: and copy the URL link as shown below.

Now run the following command with copied link terminal window. I suggest phrase the command in notepad and copy on command prompt and enter. So that we can make sure that we don't miss any letter in URL while pasting it on terminal window. Otherwise you can do as your comfort.

wget http://apache.mirror1.spango.com/tomcat/tomcat-7/v7.0.63/bin/apache-tomcat- 7.0.63.tar.gz

Decompress the file after downloading with below command.
tar xvzf apache-tomcat-7.0.63.tar.gz

Move the tomcat to the right location with below command.
mv apache-tomcat-7.0.53 /opt/tomcat

3. Install Tomcat Webserver

Now we have to add Java and Tomcat to environment variables of Ubuntu OS. Just open the .bashrc with vim editor. You can find some tutorials online on how to use vim editor on Ubuntu.

Run the following command.

vim ~/.bashrc

Add the below two lines to the end of the .bashrc file and save then exit.

export JAVA_HOME=/usr/lib/jvm/default-java
export CATALINA_HOME=/opt/tomcat

To ensure the changes are effected run the following command.

. ~/.bashrc

Run the below command to start the tomcat.

$CATALINA_HOME/bin/startup.sh

If you get following result, then we have done proper installation of tomcat and Java.

Using CATALINA_BASE: /opt/tomcat
            Using CATALINA_HOME: /opt/tomcat
            Using CATALINA_TMPDIR: /opt/tomcat/temp
            Using JRE_HOME: /usr/lib/jvm/default-java
            Using CLASSPATH: /opt/tomcat/bin/bootstrap.jar:/opt/tomcat/bin/tomcat-juli.jar
            Tomcat started.

We can verify the Tomcat is running successfully or not. Just open the browser and type http://localhost:8080/ or http://127.0.0.1:8080/ and enter. Then you will see the screen as shown in below image.

Hope this will be useful for the guys who are new to Ubuntu. If you have any issue please put it comments section, so that I can respond with a solution.

Java Health Center - Overview and Features

This video highlights the features available in Health Center. Health Center is a low-processor and memory usage diagnostic tool for monitoring the status of a running IBM Java Virtual Machine (JVM). Health Center provides live information and recommendations in each of the following areas: - Classes: information about classes being loaded - Environment: details of the configuration and system of the monitored application - Garbage Collection: information about the Java heap and pause times - Locking: information about contention on inflated locks - Profiling: sampling profile of Java methods including call paths

Continue Reading >>>>

WebSphere MQ Interview Questions

What is MQ and what does it do? Ans. MQ stands for MESSAGE QUEUEING. WebSphere MQ allows application programs to use message queuing to participate in message-driven processing. Application programs can communicate across different platforms by using the appropriate message queuing software products. What is Message driven process? Ans . When messages arrive on a queue, they can automatically start an application using triggering. If necessary, the applications can be stopped when the message (or messages) have been processed. What are advantages of the MQ? Ans. 1. Integration. 2. Asynchrony 3. Assured Delivery 4. Scalability. How does it support the Integration? Ans. Because the MQ is independent of the Operating System you use i.e. it may be Windows, Solaris,AIX.It is independent of the protocol (i.e. TCP/IP, LU6.2, SNA, NetBIOS, UDP).It is not required that both the sender and receiver should be running on the same platform What is Asynchrony? Ans. With messag...

Continue Reading >>>>

Java Garbage Collection

Explain Garbage collection mechanism in Java? Garbage collection is one of the most important features of Java. The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources can be reclaimed and reused. A Java object is subject to garbage collection when it becomes unreachable to the program in which it is used. Garbage collection is also called automatic memory management as JVM automatically removes the unused variables/objects (value is null) from the memory. Every class inherits finalize() method from java.lang.Object, the finalize() method is called by garbage collector when it determines no more references to the object exists. In Java, it is good idea to explicitly assign null into a variable when no more in use. In Java on calling System.gc() and Runtime.gc(), JVM tries to recycle the unused objects, but there is no guarantee when all the objects will garbage collected. Garbage collection is an automatic pro...

Continue Reading >>>>

Java J2ee Planet

Search This Blog