11/30/2021

Tomcat 8 Jdk

Tomcat Setup

Tomcat 8 Docker Image. A docker image for Tomcat 8 and Oracle JDK 7. Map the directory containing your war files into the container under /deploy, using volumes.For example. Docker Official Image packaging for Apache Tomcat - docker-library/tomcat.

Table of Contents

Introduction

There are several ways to set up Tomcat for running on different platforms. The main documentation for this is a file called RUNNING.txt. We encourage you to refer to that file if the information below does not answer some of your questions.

Windows

Installing Tomcat on Windows can be done easily using the Windows installer. Its interface and functionality is similar to other wizard based installers, with only a few items of interest.

  • Installation as a service: Tomcat will be installed as a Windows service no matter what setting is selected. Using the checkbox on the component page sets the service as 'auto' startup, so that Tomcat is automatically started when Windows starts. For optimal security, the service should be run as a separate user, with reduced permissions (see the Windows Services administration tool and its documentation).
  • Java location: The installer will provide a default JRE to use to run the service. The installer uses the registry to determine the base path of a Java 7 or later JRE, including the JRE installed as part of the full JDK. When running on a 64-bit operating system, the installer will first look for a 64-bit JRE and only look for a 32-bit JRE if a 64-bit JRE is not found. It is not mandatory to use the default JRE detected by the installer. Any installed Java 7 or later JRE (32-bit or 64-bit) may be used.
  • Tray icon: When Tomcat is run as a service, there will not be any tray icon present when Tomcat is running. Note that when choosing to run Tomcat at the end of installation, the tray icon will be used even if Tomcat was installed as a service.
  • Refer to the Windows Service HOW-TO for information on how to manage Tomcat as a Windows service.

The installer will create shortcuts allowing starting and configuring Tomcat. It is important to note that the Tomcat administration web application can only be used when Tomcat is running.

Unix daemon

Tomcat can be run as a daemon using the jsvc tool from the commons-daemon project. Source tarballs for jsvc are included with the Tomcat binaries, and need to be compiled. Building jsvc requires a C ANSI compiler (such as GCC), GNU Autoconf, and a JDK.

Before running the script, the JAVA_HOME environment variable should be set to the base path of the JDK. Alternately, when calling the ./configure script, the path of the JDK may be specified using the --with-java parameter, such as ./configure --with-java=/usr/java.

Using the following commands should result in a compiled jsvc binary, located in the $CATALINA_HOME/bin folder. This assumes that GNU TAR is used, and that CATALINA_HOME is an environment variable pointing to the base path of the Tomcat installation.

Please note that you should use the GNU make (gmake) instead of the native BSD make on FreeBSD systems.

Tomcat can then be run as a daemon using the following commands.

You may also need to specify -jvm server if the JVM defaults to using a server VM rather than a client VM. This has been observed on OSX.

jsvc has other useful parameters, such as -user which causes it to switch to another user after the daemon initialization is complete. This allows, for example, running Tomcat as a non privileged user while still being able to use privileged ports. Note that if you use this option and start Tomcat as root, you'll need to disable the org.apache.catalina.security.SecurityListener check that prevents Tomcat starting when running as root.

jsvc --help will return the full jsvc usage information. In particular, the -debug option is useful to debug issues running jsvc.

The file $CATALINA_HOME/bin/daemon.sh can be used as a template for starting Tomcat automatically at boot time from /etc/init.d with jsvc.

Note that the Commons-Daemon JAR file must be on your runtime classpath to run Tomcat in this manner. The Commons-Daemon JAR file is in the Class-Path entry of the bootstrap.jar manifest, but if you get a ClassNotFoundException or a NoClassDefFoundError for a Commons-Daemon class, add the Commons-Daemon JAR to the -cp argument when launching jsvc.

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Introduction

Apache Tomcat is an open-source web server and servlet container that is used to serve Java applications.

It is developed by the Apache Software Foundation, written in Java and released under Apache License 2.0.

It is a top level project of the Apache foundation. Apache Tomcat currently implements Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket.

Apache tomcat 8 has upgraded some features. Some of them are listed below:

  1. Tomcat 8 requires JAVA 7 or Higher to work.
  2. Tomcat 8 supports Java Servlet 3.1
  3. Tomcat 8 supports JavaServer Pages 2.3
  4. Tomcat 8 supports Java Unified Expression Language 3.0
  5. Tomcat 8 supports Java WebSocket 1.0

In this tutorial, we'll learn how to install and configure latest release of Apache Tomcat 8 on CentOS 7 server.

Requirements

A server running CentOS v. 7.A static IP Address for your server.A non-root user account with sudo privilege set up on your server.

Installing Java

Before installing Tomcat, you will need to install Java Development Kit (JDK) on your system, so any Java web application code can be executed.

To install OpenJDK 7 JDK using yum, run this command:

sudo yum install java-1.7.0-openjdk-devel

Finally, to verify if the Java installation was successful, run the following command:

java -version

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The output should be similar to what is displayed below:

Create Tomcat User

Before proceeding with the Tomcat installation. First create a separate system user and group which will run the Tomcat server:

First, create a new tomcat group:

sudo groupadd tomcat

Then create a new tomcat user with a home directory of /opt/tomcat and group tomcat by running the following command:

sudo useradd -M -s /bin/nologin -g tomcat -d /opt/tomcat tomcat

Download and Install Apache Tomcat

Now, download the latest version of Tomcat 8 available at http://tomcat.apache.org/download-80.cgi.You can use wget to download the Tomcat 8 in /tmp directory.

cd /tmpsudo wget http://mirror.fibergrid.in/apache/tomcat/tomcat-8/v8.0.33/bin/apache-tomcat-8.0.33.tar.gz

Now, extract the contents of the Tomcat archive you just downloaded to /opt and rename apache-tomcat-8.0.33 to tomcat.To do this, run the following command:

cd /optsudo tar -xvf /tmp/apache-tomcat-8.0.33.tar.gzsudo mv apache-tomcat-8.0.33 tomcat

Next, setup proper ownership using the following commands:

sudo chown -R tomcat:tomcat /opt/tomcat

Create a systemd Service File

Now, you will need to create a systemd file to run Tomcat as a service.

You can create this file by running the following command:

sudo nano /etc/systemd/system/tomcat8.service

Add the following content:

Save and close the file then run the following commands to start the Tomcat service and enable Tomcat service to start on boot:

sudo systemctl daemon-reloadsudo systemctl start tomcat8Tomcat - Dev - Compiling JSPs with JDK 1.8 in Tomcat 8sudo systemctl enable tomcat8

Test Apache Tomcat

By default tomcat runs on port 8080, So you will need to open port 8080 in your firewall to access tomcat from network.

You can allow port 8080 through firewall by running the following command:

sudo firewall-cmd --permanent --add-port=8080/tcp

Tomcat 8 Jdk 11

sudo firewall-cmd --reload

After that, you can access apache tomcat by typing URL http://server-ip-address:8080. You should see the default Tomcat splash page as below:

Update Tomcat Port

Tomcat uses, by default, port number 8080 on your system. It is very important to rememeber that you would have a port number conflict if there is another service running on the same port on your system. So, to get around this you will need to change the tomcat port from 8080 to something else.

You can change the port number for your tomcat server by changing in the configuration file.

You can do this by editing server.xml file located under /opt/tomcat/conf directory.

sudo nano /opt/tomcat/conf/server.xml

Change port number from 8080 to 8081 as below:

Save and exit the file and restart Tomcat8 service.

sudo systemctl restart tomcat8.service

Next, open port 8081 in firewall to access tomcat from network.

You can allow port 8081 through firewall by running the following command:

sudo firewall-cmd --permanent --add-port=8081/tcpsudo firewall-cmd --reload

Configure Apache Tomcat

By default, you can not access admin and other sections like Server Status, Manager App and Host Manager.

To access all these sections, you will need to add user accounts for admins and managers.

You can do this by editing tomcat-users.xml file:

sudo nano /opt/tomcat/conf/tomcat-users.xml

Find the section `` and add the following lines before that:

Save and close the file, restart tomcat service to take new changes into effect.

sudo systemctl restart tomcat8.service

Finally, Tomcat is setup and running. You can access the admin and other sections by typing URL http://server-ip-address:8081 in your web browser:

After clicking Manager App, you will be asked to enter the username and password, you just created above, after login you will see below interface:

Tomcat Web Application Manager

You can manage your Java applications using the Tomcat Web Application Manager. It is also used to Start, Stop, Reload, Deploy, and Undeploy. You can also diagnostics on your apps using Tomcat Web Application Manager.

Server StatusTomcat Host Manager

Tomcat 8 Jdk Free

Conclusion

I hope you now have enough knowledge to install and configure Tomcat 8 on your server.

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