2021. 3. 6. 05:33ㆍ카테고리 없음
When it’s necessary to build your apps or do some programming on Java, it’s always important to have all the necessary tools ready, for example, the compiler (also known as JDK – Java Development Kit) and the runtime (also known as JRE – Java Runtime Environment). Note that by default, JDK comes up with JRE, so you don’t have to manually install JRE again.
Of course, Java programs require a special environment to work on. When you compile a Java program, it generates a “jar” package that contains a universal binary form of the app. When you wish to run it, it’s the task of the JRE to read the universal binary and run it smoothly on the current system.
Linux is my favorite platform for programming, especially Java. You can work with both the Oracle Java and the OpenJDK. For Linux, I prefer the OpenJDK one as it’s more convenient on the Linux platform and almost all the major Linux distros integrate with OpenJDK easier than the Oracle counterpart.
CentOS is the open-source and community edition of the well-known and respected RHEL (Red Hat Enterprise Linux). I just got my CentOS machine ready, now I need to set OpenJDK.
Before we are going to install OpenJDK on Centos 8, there are several prerequisite to be fulfilled, namely: root account or ordinary account with sudo privilege, sufficient disk space, good internet connection. To install the OpenJDK 11 on CentOS 8, we will use the dnf command line as root or user with sudo privileges. Openjdk version '11.0.2' 2019-01-15 LTS OpenJDK Runtime Environment 18.9 (build 11.0.2+7-LTS) OpenJDK 64-Bit Server VM 18.9 (build 11.0.2+7-LTS, mixed mode, sharing) The output may vary depending upon the package and the version you chose it to be the default Java version. CentOS Install OpenJDK When it’s necessary to build your apps or do some programming on Java, it’s always important to have all the necessary tools ready, for example, the compiler (also known as JDK – Java Development Kit) and the runtime (also known as JRE – Java Runtime Environment). There are JDK versions available from the base CentOS repositories. Depending on your version of CentOS, and the JDK you want to install, the following as root should give you what you want: OpenJDK Runtime Environment (Java SE 6) yum install java-1.6.0-openjdk OpenJDK Runtime Environment (Java SE 7) yum install java-1.7.0-openjdk.
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There’re 2 separate ways of setting OpenJDK on CentOS – from the default CentOS repository (OpenJDK 8) and manually downloading and setting the OpenJDK (OpenJDK 11). Don’t forget to check out the latest features of Java 11!
Installing from CentOS repo
Fire up a terminal and make sure that everything is up-to-date –
Now, run the following command –
Installing OpenJDK manually
Note that this is not the recommended way of enjoying OpenJDK. Use the previous method unless you REALLY need the latest OpenJDK.
Using this method, you can also
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Extract the downloaded OpenJDK –
Don’t forget to verify the extraction –
It’s time to make the switch to the newer JDK.
--install /usr/bin/$(basename $bin) $(basename $bin) $bin 100; done'
sudosh-c'for bin in /usr/lib/jvm/jdk-11.0.1/bin/*; do update-alternatives
--set $(basename $bin) $bin; done'
Now, we will grab “update-alternatives” and tell the system to change to the newly set OpenJDK –
Then, select the OpenJDK number that represents the OpenJDK 11 –
Voila! OpenJDK is now present in the system!
Don’t forget to check out the result of the change –
For Java programming, what’s better than a well-packed IDE? Check out Eclipse – one of the finest IDEs for Java programmers!
Java Development Kit (JDK) is used to develop and test Java applications. It is used by millions of Java developers around the world.JDK has 2 versions. OpenJDK and Oracle JDK. OpenJDK is an open source implementation of Oracle JDK. Oracle JDK contains some proprietary codes that OpenJDK does not have. OpenJDK is open source where Oracle JDK is not.
In this article, I am going to show you how to install Oracle JDK 12 and OpenJDK 12 on CentOS 7. So, let’s get started.
Oracle JDK 12 is not available in the official package repository of CentOS 7. But, you can easily download Oracle JDK 12 from the official website of Oracle and install it on CentOS 7.
First, visit https://www.oracle.com/technetwork/java/javase/downloads/index.html from your favorite browser. Once the page loads, click on the DOWNLOADJava Platform (JDK) 12 button as marked in the screenshot below.
Now, click on Accept License Agreement to accept the Oracle Technology Network License Agreement for Oracle Java SE.
Your browser should prompt you to save the file. Select Save File and click on OK.
jdk 12.0.1 RPM package is being downloaded.
Once the download is complete, navigate to the ~/Downloads directory as follows:
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As you can see, the RPM package file I just downloaded is here.
Now, install the RPM package file with the following command:
Oracle JDK 12 is being installed.
Oracle JDK 12 should be installed at this point.
Now, to check that the installation was successful and Oracle JDK 12 is working, run the following command:
As you can see, Oracle JDK 12 is working.
Installing OpenJDK 12:
OpenJDK 12 is not available in the official package repository of CentOS 7. But, you can easily download it from the official website of OpenJDK and install it on CentOS 7.
To download OpenJDK 12, visit https://jdk.java.net/12/ from your favorite web browser and click on the .tar.gz link as marked in the screenshot below.
Your browser should prompt you to save the OpenJDK 12 .tar.gz archive. Select Save File and click on OK.
Your browser should start downloading OpenJDK 12 archive. It may take a while to complete.
Once the download is complete, navigate to the ~/Downloads directory with the following command:
As you can see, the OpenJDK 12 archive you’ve just downloaded is here.
Now, extract the OpenJDK 12 archive in the /opt directory with the following command:
The OpenJDK 12 archive should be downloaded.
As you can see, a new directory is created in the /opt directory. Note the directory name.
Now, you have to add the JAVA_HOME environment variable and add the OpenJDK 12 binary directory to the PATH environment variable. To do that, run the following command:
sudotee/etc/profile.d/openjdk12.sh
Install Openjdk Linux Centos Virtualbox
A new file /etc/profile.d/openjdk12.sh should be created.
Now, reboot your computer with the following command:
Once your computer boots, run the following command to check whether the environment variables JAVA_HOME and PATH is set correctly.
As you can see, the environment variables are correctly set.
Now, check whether OpenJDK 12 is working correctly with the following command:
OpenJDK version 1.8.0_212! This is not the version we installed.
The problem is another version of OpenJDK is installed on your CentOS 7 machine. To solve this problem, just remove the old OpenJDK packages from your CentOS 7 machine as follows:
Now, press y and then press <Enter> to continue.
The older version of OpenJDK should be removed.
As you can see, now the version is correctly displayed. So, the OpenJDK we’ve installed earlier is being used.
Compiling and Running a Simple Java Program with JDK 12:
In this section, I am going to compile and run a simple Java program with JDK 12.
I wrote a simple Java program in a file Welcome.java and put it in the ~/codes directory on my login users HOME directory.
The contents of the Welcome.java Java source file are:
publicstaticvoid main(String[] args){
System.out.println('Welcome to LinuxHint!');
}
}
First, navigate to the directory where the Welcome.java source file is.
Then, to compile the Welcome.java Java source file, run the following command:
Install Openjdk 11 On Centos 8
Once the Welcome.java source file is compiled, a Welcome.class file should be generated. This is a Java class file. It contains Java bytecodes that the Java Virtual Machine (JVM) can understand.
Install Openjdk Linux Centos Linux
As you can see, the correct output is displayed.
So, that’s how you install Oracle JDK 12 and OpenJDK 12 on CentOS 7. Thanks for reading this article.