Difference between revisions of "JDK setup"
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It's everywhere, and you need some library to execute these programs.
 
It's everywhere, and you need some library to execute these programs.
  
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==Get Java==
+
 
 +
 
 +
=Get Java=
 
2 versions of Java are available:
 
2 versions of Java are available:
 
* '''JRE''' as Java Runtime Environment. For end-users. Download JRE: https://java.com/getjava‎
 
* '''JRE''' as Java Runtime Environment. For end-users. Download JRE: https://java.com/getjava‎
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You need to install the JDK on your development station & servers.
 
You need to install the JDK on your development station & servers.
  
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==Windows installation==
 
  
−
==Linux installation==
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 +
=Windows installation=
 +
 
 +
1. Create a new environment variable
 +
* Name:  JAVA_HOME
 +
* Value:    path to your JDK installation (C:\Program Files\java\jdk1.7.0_45)
 +
 +
2. Update the PATH
 +
* Add following sequence to the end of the PATH variable:
 +
      > %JAVA_HOME%\bin
 +
 +
3. Check installation
 +
* Open a new terminal console [Run -> "cmd"]
 +
* Run:  java -version
 +
 
 +
 +
 
 +
=Linux installation=
  
 
On a server, I advise you to put the JDK instead of the JRE. Many services requires the JDK such as JMX.
 
On a server, I advise you to put the JDK instead of the JRE. Many services requires the JDK such as JMX.
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I advise you to use the official ORACLE library, instead of the OpenSource OpenJDK due to stability issues and JavaFX2 compability.
 
I advise you to use the official ORACLE library, instead of the OpenSource OpenJDK due to stability issues and JavaFX2 compability.
  
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===ORACLE JVM automatic installation (ubuntu)===
+
 
 +
==ORACLE JVM automatic installation (ubuntu)==
 
This is for Ubuntu based distributions only.
 
This is for Ubuntu based distributions only.
  
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</syntaxhighlight>
 
</syntaxhighlight>
  
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===ORACLE JVM manual installation (debian)===
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−
====Download JDK====
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==ORACLE JVM manual installation (debian)==
 +
 
 +
===Download JDK===
 +
 
 
You've to retrieve the JDK / JRE from the ORACLE website
 
You've to retrieve the JDK / JRE from the ORACLE website
 
* Through a graphical interface: http://www.oracle.com/technetwork/java/javase/downloads/index.html
 
* Through a graphical interface: http://www.oracle.com/technetwork/java/javase/downloads/index.html
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$ORACLE_JVM_URL --output-document=$ORACLE_JVM_FILENAME
 
$ORACLE_JVM_URL --output-document=$ORACLE_JVM_FILENAME
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
 
You have to adjust the ORACLE_JVM_URL to the exact JVM you want to use.
 
You have to adjust the ORACLE_JVM_URL to the exact JVM you want to use.
  
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====Installation====
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 +
===Installation===
 +
 
 
* Get binaries
 
* Get binaries
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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cd /usr/lib/jvm
 
cd /usr/lib/jvm
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
 
* Register new version
 
* Register new version
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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</syntaxhighlight>
 
</syntaxhighlight>
 
You have to adjust the source folder /usr/lib/jvm/'''jdk1.7.0_45'''/bin/.
 
You have to adjust the source folder /usr/lib/jvm/'''jdk1.7.0_45'''/bin/.
 +
 
* Adjust symlink
 
* Adjust symlink
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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</syntaxhighlight>
 
</syntaxhighlight>
 
You have to adjust the source folder in LS command.
 
You have to adjust the source folder in LS command.
 +
 
* Set system default version
 
* Set system default version
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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update-alternatives --config jar
 
update-alternatives --config jar
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
 
* Check result
 
* Check result
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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</syntaxhighlight>
 
</syntaxhighlight>
  
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====Environment variable JAVA_HOME====
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 +
===Environment variable JAVA_HOME===
 
You need to add an environment variable JAVA_HOME, if it does not already exist:
 
You need to add an environment variable JAVA_HOME, if it does not already exist:
 
* Debian
 
* Debian
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vim /etc/profile
 
vim /etc/profile
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
 
* Ubuntu
 
* Ubuntu
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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export JAVA_HOME="/usr/lib/jvm/default-java"
 
export JAVA_HOME="/usr/lib/jvm/default-java"
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
 
Update PATH:
 
Update PATH:
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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</syntaxhighlight>
 
</syntaxhighlight>
  
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===OpenJdk===
+
 
 +
==OpenJdk==
 
It’s always good to setup OpenJDK as well, especially for the old versions as there is more updates than the ORACLE version.
 
It’s always good to setup OpenJDK as well, especially for the old versions as there is more updates than the ORACLE version.
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
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===Choose default java version===
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==Choose default java version==
 
<syntaxhighlight lang="bash">
 
<syntaxhighlight lang="bash">
 
update-alternatives --config java
 
update-alternatives --config java
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update-alternatives --config jar
 
update-alternatives --config jar
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
  
 
==Reminders==
 
==Reminders==

Revision as of 12:24, 26 January 2014

“Java” is one of the most popular and common language in this world.

It's everywhere, and you need some library to execute these programs.


Get Java

2 versions of Java are available:

You need to install the JDK on your development station & servers.


Windows installation

1. Create a new environment variable

  • Name: JAVA_HOME
  • Value: path to your JDK installation (C:\Program Files\java\jdk1.7.0_45)

2. Update the PATH

  • Add following sequence to the end of the PATH variable:
     > %JAVA_HOME%\bin

3. Check installation

  • Open a new terminal console [Run -> "cmd"]
  • Run: java -version


Linux installation

On a server, I advise you to put the JDK instead of the JRE. Many services requires the JDK such as JMX.

While on Windows ORACLE java is almost the only JVM available, on Linux you can choose your JVM vendor: OpenJDK, ORACLE, .... I advise you to use the official ORACLE library, instead of the OpenSource OpenJDK due to stability issues and JavaFX2 compability.


ORACLE JVM automatic installation (ubuntu)

This is for Ubuntu based distributions only.

Add a new repository: 

add-apt-repository ppa:webupd8team/java
apt-get update

Install ORACLE JDK packages: 

apt-get install oracle-java7-installer oracle-jdk7-installer

This will download the latest JDK, install it automatically and set the new JVM as the default one.

To remove the repository: 

apt-add-repository --remove ppa:webup8team/java


ORACLE JVM manual installation (debian)

Download JDK

You've to retrieve the JDK / JRE from the ORACLE website 

export ORACLE_JVM_URL='http://download.oracle.com/otn-pub/java/jdk/7u45-b18/jdk-7u45-linux-x64.tar.gz'
export ORACLE_JVM_FILENAME='jdk-linux-x64.tar.gz'
wget -c --no-cookies --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F" \
$ORACLE_JVM_URL --output-document=$ORACLE_JVM_FILENAME

You have to adjust the ORACLE_JVM_URL to the exact JVM you want to use.


Installation

  • Get binaries
tar -xzvf $ORACLE_JVM_FILENAME
mv jdk1.7.* /usr/lib/jvm
cd /usr/lib/jvm
  • Register new version
update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_45/bin/java 1065
update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_45/bin/javac 1065
update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.7.0_45/bin/jar 1065
update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.7.0_45/bin/javaws 1065

You have to adjust the source folder /usr/lib/jvm/jdk1.7.0_45/bin/.

  • Adjust symlink
rm /usr/lib/jvm/default-java
ln -s /usr/lib/jvm/jdk1.7.0_45/ /usr/lib/jvm/default-java

You have to adjust the source folder in LS command.

  • Set system default version
update-alternatives --config java
update-alternatives --config javac
update-alternatives --config javaws
update-alternatives --config jar
  • Check result
java -version


Environment variable JAVA_HOME

You need to add an environment variable JAVA_HOME, if it does not already exist:

  • Debian
vim /etc/profile
  • Ubuntu
vim /etc/environment

Add the following line: 

export JAVA_HOME="/usr/lib/jvm/default-java"

Update PATH: 

if [ "`id -u`" -eq 0 ]; then
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:$JAVA_HOME/bin"
else
PATH="/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:$JAVA_HOME/bin"
fi
export PATH


OpenJdk

It’s always good to setup OpenJDK as well, especially for the old versions as there is more updates than the ORACLE version. 

apt-get install openjdk-6-jdk openjdk-7-jdk


Choose default java version

update-alternatives --config java
update-alternatives --config javac
update-alternatives --config javaws
update-alternatives --config jar


Reminders

Don't forget to adjust the JAVA_HOME in all JAVA related services:

  • Tomcat: /etc/default/tomcat7
  • Eclipse IDE: eclipse.ini
  • Jenkins
  • etc.
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