ubuntu14.04 installing JDK and TOMCAT7 eclipse

I. Installing the JDK:

2. Download JDK: http://www.oracle.com/technetwork/java/javase/downloads/index.html Note that the downloaded file ends in tar.gz, for example: jdk-7u21-linux-i586.tar.gz
4. Unzip: I created a new Javadev directory in the home directory to hold Java related software.
   sudo tar-zxvf/home/hsiung/download/jdkxxxx.tar.gz-c/home/hsiung/javadev/
6. Setting environment variables
   Note that many of the online tutorials are to copy or move the JDK folder to the USR folder, this is not necessary, as long as the path path to configure the correct JDK path on the line, so no need to move.
   

   Access to the root account can also be used by ordinary users
   sudo-s//Open the. bashrc file with the editor
   Gedit. BASHRC under the ordinary user Note add sudo
   Add the environment variable as above in the last line (file location according to your actual situation)
   
   Export java_home=/home/hsiung/javadev/jdk1.7.0_67
   Export JRE_HOME=${JAVA_HOME}/JRE
   Export Classpath=.:${java_home}/lib:${jre_home}/lib
   Export Path=${java_home}/bin: $PATH
   
   Restart or logoff takes effect.

7. Configure the default JDK version (to replace OPENJDK)

   Open the terminal, just open it anywhere, and then execute the command in turn.

   sudo update-alternatives--install /home/hsiung/javadev/bin /java

   sudo update-alternatives--install /home/hsiung/javadev/bin /javac

   sudo update-alternatives--install /home/hsiung/javadev/bin /jar

   sudo update-alternatives--install /home/hsiung/javadev/bin /javah

   sudo update-alternatives--install /home/hsiung/javadev/bin /javap

   You only need to replace the path of the blue portion of the upper part of the bin directory under your JDK . Pay attention to one sentence of execution!

   Finally, execute the command below:

   sudo update-alternatives--config java

   If you first install the JDK, you will be prompted

   Thereis only one alternative in link Group Java (providing/usr/bin/java):/home/apples/javadevelop/jdk-7u21-linux-i586/ Bin/java

   No configuration required.

   For non-initial installation, there will be different versions of the JDK option.

9. Test:
   Check that the command output is correct
   Echo $JAVA _home
   Echo $JRE _home
   Echo $PATH
   Java-version

Two. Install Tomcat

2. Download: http://tomcat.apache.org/ Download the tar.gz file below the core. Tomcat 7.
4. Unzip, ibid. Or in the Javadev directory. And finally the/javadev/tomcat7/.

6. Configuring the Environment

   Open the Tomcat directory and go to the bin directory. sudo gedit open startup.sh, added at the end

   Java_home= your Java path
   

   Path= $JAVA _home/bin: $PATH

   Classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar

   Tomcat_home= /HOME/HSIUNG//JAVADEV/TOMCAT7

8. Modify Permissions
   Many people will encounter this problem:

   Ubuntu under Tomcat does not start, prompting

   Neither the Java_home nor the JRE_HOME environment variable is defined
   At least one of these environment variable are needed to run this program
   If the Java test output is correct, then the permissions are insufficient.
   ~# chmod 777/home/hsiung/javadev/tomcat7-r//Note is root

10. Start
    /home/hsiung/javadev/tomcat7/bin/startup.sh
    
    
    Output:
    Using catalina_base:/HOME/HSIUNG/JAVADEV/TOMCAT7
    Using Catalina_home:/HOME/HSIUNG/JAVADEV/TOMCAT7
    Using Catalina_tmpdir:/home/hsiung/javadev/tomcat7/temp
    Using Jre_home:/home/hsiung/javadev/jdk1.7.0_67/jre
    Using CLASSPATH:/home/hsiung/javadev/tomcat7/bin/bootstrap.jar:/home/hsiung/javadev/tomcat7/bin/tomcat-juli.jar
    Tomcat started.

12. Once the server is started, you can enter it in the browser: http://localhost:8080 will be able to see the Tomcat Welcome page.

Turn Tomcat off: under the Tomcat/bin directory
sudo./shutdown.sh
Three. Install Eclipse

2. Download http://www.eclipse.org/downloads/

   If you need to develop JSP website can download Java EE version, or download javase version
   I downloaded the Java EE version: Eclipse IDE for Java eedevelopers, choose your current ubuntu corresponding number of digits

4. Unzip ibid.
6. Click Eclipse to run it. Here's a common error:a Java Runtime environment (JRE) or Java development Kit (JDK)
   Must is available in order to run Eclipse. No Java virtual machine is found after searching the following locations:
   /home/hsiung/javadev/eclipse/jre/bin/java Java in your current PATH
   Workaround:
   Open terminal input in the Eclipse directory:
   mkdir JRE
   CD JRE
   Ln-s /home/hsiung/javadev/jdk1.7.0_67/bin bin//Red is your JDK directory

7. Creating Eclipse shortcuts on the desktop

   Create a new blank file on the desktop, named: eclipse.desktop

   Open the newly created Eclipse.desktop file with sudo gedit, and paste the following inside:

   [Desktopentry]

   Encoding=utf-8

   Name=eclipseplatfrom

   Comment=eclipseide

   exec= /home/hsiung/javadev/eclipse/eclipse

   icon= /home/hsiung/javadev/eclipse/icon.xpm

   Terminal=false

   Startupnotify=true

   Type=application

   Categories=application;development;

   Name[zh_cn]=eclipse

ubuntu14.04 installing JDK and TOMCAT7 eclipse