Installing the JDK under Linux-ubuntu

1. Prepare a pure Ubuntu system using Xshell to connect to the server

2. Install RPM, Resource Pack Manager

Direct Input Command:

Apt-get Install rpm

Also need to install Alien

Apt-get Install Alien

3. Download the JDK installation package jdk-7u79-linux-x64.rpm

It is said to be installed directly, using Alien-i jdk-7u79-linux-x64.rpm

But I was first converted into a Debain package and then installed.

Alien-d jdk-7u79-linux-x64.rpm

Dpkg-i Jdk-7u79-linux-x64.deb

Installation Successful

4. Configure Environment variables

Using the VI Editor to open/etc/profile

Input command: Vi/etc/profile

Press the I key to enter edit mode

At the end of the profile file, add:
Export java_home=/usr/share/jdk1.6.0_14
Export path= $JAVA _home/bin: $PATH
Export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar

Then press "ESC" key to exit Edit mode and enter: WQ press ENTER to save and exit

5. It's a little bit more of a pit daddy. After the JDK installation is successful, the two jar packages under the directory are not normal

A/usr/java/jdk1.7.0_79/lib under Tools.pack needs to be decompressed into Tools.jar.

A/usr/java/jdk1.7.0_79/jre/lib under Rt.pack needs to be decompressed into Rt.jar.

If the Java Virtual machine does not start, it will report

Error occurred during initialization of VM Java/lang/noclassdeffounderror:java/lang/object errors

Extract using Java's own unpack200 tool

Enter the command:

unpack200 Tools.pack Tools.jar

unpack200 Rt.pack Rt.jar

6. Finally reboot the system.

Reboot

Installing the JDK under Linux-ubuntu