How to Download and Install Java 6 Update 21 on Your Computer
Download Java 6 Update 21: Why and How
Java is one of the most popular programming languages and platforms in the world. It allows you to run applications and games on your computer, web browser, mobile device, and more. However, to enjoy the full benefits of Java, you need to keep it updated to the latest version. In this article, we will explain what Java 6 Update 21 is, why you need it, and how to download and install it on your computer.
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What is Java 6 Update 21 and why do you need it?
Java 6 Update 21 is a release of the Java SE (Standard Edition) platform that was launched in July 2010. It contains several improvements and bug fixes for the Java runtime environment, the Java virtual machine, and the Java development tools. Some of the main features and benefits of Java 6 Update 21 are:
Java SE 6 Update 21 features and benefits
It includes version 17.0 of the Java HotSpot Virtual Machine, which offers better performance and stability, as well as new features such as compressed object pointers, escape analysis-based optimization, code cache management, and the Garbage First (G1) garbage collector.
It supports custom loading progress indicators for Java Web Start applications and applets, which allow you to enhance the user experience by showing how much of the application has been downloaded during startup.
It adds support for more system configurations, such as Oracle Enterprise Linux, Red Hat Enterprise Linux, Oracle VM, and Google Chrome.
It updates the Olson time zone data to version 2010i, which reflects the latest changes in daylight saving time and time zone rules around the world.
Java SE 6 Update 21 security and compatibility issues
While Java SE 6 Update 21 offers many advantages, it also has some drawbacks that you should be aware of before downloading it. Some of the main security and compatibility issues are:
It is not the latest version of Java SE. As of June 2023, the latest version is Java SE 17, which has more features, security patches, and bug fixes than Java SE 6. Oracle recommends downloading the latest JRE (Java Runtime Environment) and JDK (Java Development Kit) versions for production use.
It may not be compatible with some applications or websites that require a newer version of Java. You may encounter errors or performance issues if you try to run them with Java SE 6 Update 21. You should check with the developers or providers of those applications or websites before downloading Java SE 6 Update 21.
It may raise a warning dialog when you mix signed and unsigned code in a Java Web Start application or applet. This is because mixing signed and unsigned code can pose a security risk for your computer. You should only trust signed code from reputable sources and avoid unsigned code if possible.
It may cause a security exception when you drag-and-drop data from a trusted application or applet to an untrusted one. This is because drag-and-drop can result in a null value being passed instead of the expected data. You should only drag-and-drop data from trusted sources and avoid untrusted ones.
As you can see, Java SE 6 Update 21 has both pros and cons. You should weigh them carefully before deciding whether to download it or not. If you decide to download it, here is how you can do it.
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How to download and install Java SE 6 Update 21 on your computer
Downloading and installing Java SE 6 Update 21 on your computer is a simple process that takes only a few minutes. Here are the steps you need to follow:
Step 1: Check your current Java version and system requirements
Before you download Java SE 6 Update 21, you should check if you already have it or a newer version installed on your computer. To do this, you can use the online Java version test tool or the offline Java version command. If you have Java SE 6 Update 21 or a newer version, you do not need to download it again. If you have an older version or no version at all, you should check if your system meets the minimum requirements for Java SE 6 Update 21. These are:
Operating SystemProcessorMemoryDisk Space
Windows XP/Vista/7/8/10 (32-bit or 64-bit)Pentium 2 266 MHz or higher128 MB or higher150 MB or higher
Mac OS X 10.5.8 or higher (Intel-based)Intel Core Duo or higher512 MB or higher80 MB or higher
Linux (32-bit or 64-bit)Pentium 2 266 MHz or higher64 MB or higher98 MB or higher
Solaris (SPARC or x86)UltraSPARC IIi 270 MHz or higher, AMD Opteron/Athlon64/Phenom/Turion/Sempron, Intel Xeon/Core2/Core i3/i5/i7/Pentium/Celeron/Atom128 MB or higher120 MB or higher
If your system meets these requirements, you can proceed to the next step. If not, you may need to upgrade your hardware or software before downloading Java SE 6 Update 21.
Step 2: Download Java SE 6 Update 21 from a trusted source
The next step is to download Java SE 6 Update 21 from a trusted source. You should always download Java from the official Oracle website or from a reputable third-party provider. You should avoid downloading Java from unknown or suspicious sources, as they may contain malware or viruses that can harm your computer. To download Java SE 6 Update 21 from the Oracle website, you can follow these steps:
Go to the .
Select the "Java Archive" link under the "Additional Resources" section.
Select the "Java SE 6" link under the "Java Platform (JDK) / JRE" section.
Select the "Java SE Runtime Environment (JRE) - Downloads" link under the "Java SE Runtime Environment" section.
Select the "Accept License Agreement" radio button under the "Java SE Runtime Environment 6u21" section.
Select the appropriate download link for your operating system and architecture (32-bit or 64-bit).
Save the file to your preferred location on your computer.
To download Java SE 6 Update 21 from a third-party provider, you can follow these steps:
Go to a reputable website that offers Java downloads, such as .
Select the "Download" button for Java SE Runtime Environment (JRE) - Downloads.
Select the appropriate download link for your operating system and architecture (32-bit or 64-bit).
Save the file to your preferred location on your computer.
Note that some third-party providers may require you to create an account or sign up for a newsletter before downloading Java. You should read their terms and conditions carefully before agreeing to anything.
Step 3: Run the installer and follow the instructions
Once you have downloaded the Java SE 6 Update 21 file, you can run the installer and follow the instructions to install it on your computer. The installation process may vary slightly depending on your operating system and the source of the download, but generally, you can follow these steps:
Double-click on the downloaded file to launch the installer.
Select the "Install" button to start the installation.
Select the "Next" button to proceed with the installation.
Select the "Custom" option to choose the features and components you want to install. You can also select the "Typical" option to install the default features and components.
Select the "Next" button to continue with the installation.
Select the "Finish" button to complete the installation.
The installer may ask you to restart your computer o