Installing Java 7 on Ubuntu

问题:

to install java I have always used the classic way from the terminal. I would like to install java manually. I placed the folder of the JDK on the desk and I set environment variables (PATH, CLASSPATH and JAVA_HOME). From the terminal, if I type java -version I get printed

foralobo@ubuntu-vincy:~$ java -version
java version "1.7.0_21"
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)

But when I try to install eclipse or netbeans, the system warns by saying that there is no java installed on the machine.

What is missing to compleatare manual installation? (Ubuntu 13.04)

回答1:

This answer used to describe how to install Oracle Java 7. This no longer works since Oracle end-of-lifed Java 7 and put the binary downloads for versions with security patches behind a paywall. Also, OpenJDK has grown up and is a more viable alternative nowadays.

In Ubuntu 16.04 and higher, Java 7 is no longer available. Usually you're best off installing Java 8 (or 9) instead.

sudo apt-get install openjdk-8-jre

or, f you also want the compiler, get the jdk:

sudo apt-get install openjdk-8-jdk

In Trusty, the easiest way to install Java 7 currently is to install OpenJDK package:

sudo apt-get install openjdk-7-jre

or, for the jdk:

sudo apt-get install openjdk-7-jdk

If you are specifically looking for Java 7 on a version of Ubuntu that no longer supports it, see https://askubuntu.com/questions/761127/how-do-i-install-openjdk-7-on-ubuntu-16-04-or-higher .

回答2:

sudo apt-get update
sudo apt-get install openjdk-7-jdk

and if you already have other JDK versions installed

sudo update-alternatives --config java

then select the Java 7 version.

回答3:

In addition to flup's answer you might also want to run the following to set JAVA_HOME and PATH:

sudo apt-get install oracle-java7-set-default

More information at: http://www.ubuntuupdates.org/package/webupd8_java/precise/main/base/oracle-java7-set-default

回答4:

Download the 32-bit or 64-bit Linux from "http://www.oracle.com/technetwork/java/javase/downloads/index.html" "compressed binary file" - it has a ".tar.gz" file extension.

Uncompress it

tar -xvf jdk-7u75-linux-x64.tar.gz (32-bit)

tar -xvf jdk-7u75-linux-x64.tar.gz (64-bit)

The JDK 7 package is extracted into ./jdk1.7.0_75 directory.

Now move the JDK 7 directory to /usr/lib

sudo mkdir -p /usr/lib/jvm
sudo mv ./jdk1.7.0_75 /usr/lib/jvm/

Now run

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0_75/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0_75/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0_75/bin/javaws" 1

This will assign Oracle JDK a priority of 1, which means that installing other JDKs will replace it as the default. Be sure to use a higher priority if you want Oracle JDK to remain the default.

Correct the file ownership and the permissions of the executables:

sudo chmod a+x /usr/bin/java
sudo chmod a+x /usr/bin/javac
sudo chmod a+x /usr/bin/javaws
sudo chown -R root:root /usr/lib/jvm/jdk1.7.0_75

Run

sudo update-alternatives --config java

You will see output similar to the one below - choose the number of jdk1.7.0_75 - for example 3 in this list (unless you have have never installed Java installed in your computer in which case a sentence saying "There is nothing to configure" will appear):

$ sudo update-alternatives --config java

There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                  Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-6-oracle1/bin/java   1047      auto mode
  1            /usr/bin/gij-4.6                       1046      manual mode
  2            /usr/lib/jvm/java-6-oracle1/bin/java   1047      manual mode
  3            /usr/lib/jvm/jdk1.7.0_75/bin/java      1         manual mode

Press enter to keep the current choice [*], or type selection number: 3

update-alternatives: using /usr/lib/jvm/jdk1.7.0_75/bin/java to provide /usr/bin/java (java) in manual mode

Repeat the above for:

sudo update-alternatives --config javac
sudo update-alternatives --config javaws

回答5:

I think you should consider Java installation procedure carefully. Following is the detailed process which covers almost all possible failures.

Installing Java with apt-get is easy. First, update the package index:

sudo apt-get update

Then, check if Java is not already installed:

java -version

If it returns "The program java can be found in the following packages", Java hasn't been installed yet, so execute the following command:

sudo apt-get install default-jre

You are fine till now as I assume.

This will install the Java Runtime Environment (JRE). If you instead need the Java Development Kit (JDK), which is usually needed to compile Java applications (for example Apache Ant, Apache Maven, Eclipse and IntelliJ IDEA execute the following command:

sudo apt-get install default-jdk

That is everything that is needed to install Java.

Installing OpenJDK 7:

To install OpenJDK 7, execute the following command:

sudo apt-get install openjdk-7-jre 

This will install the Java Runtime Environment (JRE). If you instead need the Java Development Kit (JDK), execute the following command:

sudo apt-get install openjdk-7-jdk

Installing Oracle JDK:

The Oracle JDK is the official JDK; however, it is no longer provided by Oracle as a default installation for Ubuntu.

You can still install it using apt-get. To install any version, first execute the following commands:

sudo apt-get install python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update

Then, depending on the version you want to install, execute one of the following commands:

Oracle JDK 7:

sudo apt-get install oracle-java7-installer

Oracle JDK 8:

sudo apt-get install oracle-java8-installer

回答6:

PPA method no longer works.

While Oracle Java 6 and 7 are not supported for quite a while, they were still available for download on Oracle's website until recently.

However, the binaries were removed about 10 days ago (?), so the Oracle Java (JDK) 6 and 7 installers available in the WebUpd8 Oracle Java PPA no longer work.

Oracle Java 6 and 7 are now only available for those with an Oracle Support account (which is not free), so I can't support this for the PPA packages.

Source : http://www.webupd8.org/2017/06/why-oracle-java-7-and-6-installers-no.html Dated : June 2017

Oracle's download page says

Updates for Java SE 7 released after April 2015, and updates for Java SE 6 released after April 2013 are only available to Oracle Customers through My Oracle Support (requires support login).

Java SE Advanced offers users commercial features, access to critical bug fixes, security fixes, and general maintenance".

I had to download it from Oracle archives - http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html

You need an account for this though.

回答7:

flup's answer is the best but it did not work for me completely. I had to do the following as well to get it working:

1. export JAVA_HOME=/usr/lib/jvm/java-7-oracle/jre/
2. chmod 777 on the folder
3. ./gradlew build - Building Hibernate

回答8:

Oracle Java 1.7.0 from .deb packages

wget https://raw.github.com/flexiondotorg/oab-java6/master/oab-java.sh
chmod +x oab-java.sh
sudo ./oab-java.sh -7
sudo apt-get update
sudo sudo apt-get install oracle-java7-jdk oracle-java7-fonts oracle-java7-source 
sudo apt-get dist-upgrade

Workaround for 1.7.0_51

There is an Issue 123 currently in OAB and a pull request

Here is the patched vesion:

wget https://raw.github.com/ladios/oab-java6/master/oab-java.sh
chmod +x oab-java.sh
sudo ./oab-java.sh -7
sudo apt-get update
sudo sudo apt-get install oracle-java7-jdk oracle-java7-fonts oracle-java7-source 
sudo apt-get dist-upgrade

回答9:

Open Applicaction -> Accessories -> Terminal

Type commandline as below...

sudo apt-get install openjdk-7-jdk

Type commandline as below...

apt-cache search jdk

(Note: openjdk-7-jdk is symbolically used here. You can choose the JDK version as per your requirement.)

For "JAVA_HOME" (Environment Variable) type command as shown below, in "Terminal" using your installation path...

export JAVA_HOME=/usr/lib/jvm/java-7-openjdk

(Note: "/usr/lib/jvm/java-7-openjdk" is symbolically used here just for demostration. You should use your path as per your installation.)

For "PATH" (Environment Variable) type command as shown below, in "Terminal" using your installation path...

export PATH=$PATH:/usr/lib/jvm/java-7-openjdk/bin

(Note: "/usr/lib/jvm/java-7-openjdk" is symbolically used here just for demostration. You should use your path as per your installation.)

Check for "open jdk" installation, just type command in "Terminal" as shown below

javac -version