"Java" Linux installation configuration Oracle JDK version 1.7

1 environment

Ubuntu 12.04 32-bit system in VMware virtual machines

2 Specific installation steps

① Download the latest JDK package

Note that the JDK distinguishes between 32-bit and 64-bit versions and is compatible with Ubuntu.

Http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

② Create a directory, unzip the Tarball

mkdir USR/LIB/JVM

Move to the directory, and unzip

[Email protected]:/usr/lib$ sudo mv jdk-7u65-linux-x64.tar.gz./JVM
Extract
Tar zvxf  jdk-7u65-linux-x64.tar.gz./JVM

③ Setting Environment variables

Edit the. Profile file

It's a good idea to back up your profile before you edit it

[Email protected]:/$ cp  ~/.profile ~/.profile_original

Open profile file sudo vim ~/.profile

Add the following command at the end of the. Profile file

Export java_home=/usr/lib/jvm/jdk1.7.0_65

Execute the following command at the terminal to make the modified configuration effective immediately:

SOURCE ~/.profile

Modify the system default JDK.

sudo update-alternatives--install/usr/bin/java Java/usr/lib/jvm/jdk1.7.0_65/bin/java 300

The results shown are as follows:

Modifying the Javac configuration

Effects such as

Then update the operation separately:

$ sudo update-alternatives--config java $ sudo update-alternatives--config javac

④ test whether the installation was successful

Then enter java-version and see the following information to change to the Sun's JDK:

⑤ issues that may be encountered

The following information is displayed when the validation is successful:

The reason: The JDK is 64-bit, and the operating system is 32-bit, does not match

The relationship of the JDK version

x86--32-bit x64--64 bit

When downloading, be sure to note whether it is 32-bit or 64-bit, to match your own system

⑥ Reference Articles

1 Blog Park, how to install JDK under Linux, take Ubuntu as an example

2 Blog Park, Ubuntu 12.04 Install and configure Java JDK

3 Ubuntu Forum, Ubuntu input Java command Prompt Unable to execute binary file