Java runtime version test

Java runtime version test

—>What Version of Java Are You Using?

On a computer with multiple web browsers, be sure to check the Java version in every browser. I say this because multiple copies of Java can sometimes be installed with different browsers using different copies. Also, Java can be enabled in one browser and disabled in another.
Note: The portion of Java that runs programs is referred to as either the Java Run-time Environment (JRE) or the Java Virtual Machine (JVM).

Method 1: Ask Java

This is my favorite — straight from the horse’s mouth (so to speak). The Java Run-time Environment is aware of its version and the company that authored it. So I wrote a very simple applet (the source code is on the About page) that gets this information from the JRE and displays it in a pink rectangle.

If Java is working, you will see a pink rectangle above with one line of text that says something like:

Java Version 1.8.0_25 from Oracle Corporation or
Java Version 1.7.0_67 from Oracle Corporation or
Java Version 1.6.0_45 from Sun Microsystems Inc. or
Java Version 1.6.0_33 from Apple Inc.

In part this is because the applet is unsigned. In the Bizarro world of Oracle, unsigned applets are treated as more dangerous than signed applets. This is backwards for two reasons. First, unsigned applets run in a restricted Java sandbox whereas signed applets are given unrestricted access to the system. Yes, the sandbox has been buggy and broken, but some security is better than none. Second, it shows a faith in the Certificate Authority system that is unwarranted.

Java on Mac Computers

The rest of this topic is a bit dated, so it has been suppressed by default.
At times Java on OS X was complicated as Java 6 came from Apple and Java 7 came from Oracle.

For many years this page had eight other methods of determining the installed version of Java.
But the page got really big, so they are no longer shown by default. But, they are still available:

Website created and maintained by Michael Horowitz mh _at_ javatester.org
Java and JavaScript are trademarks of Oracle in the US and other countries. This site is independent of Oracle.

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Java runtime version test

—>What Version of Java Are You Using?

On a computer with multiple web browsers, be sure to check the Java version in every browser. I say this because multiple copies of Java can sometimes be installed with different browsers using different copies. Also, Java can be enabled in one browser and disabled in another.
Note: The portion of Java that runs programs is referred to as either the Java Run-time Environment (JRE) or the Java Virtual Machine (JVM).

Method 1: Ask Java

This is my favorite — straight from the horse’s mouth (so to speak). The Java Run-time Environment is aware of its version and the company that authored it. So I wrote a very simple applet (the source code is on the About page) that gets this information from the JRE and displays it in a pink rectangle.

If Java is working, you will see a pink rectangle above with one line of text that says something like:

Java Version 1.8.0_25 from Oracle Corporation or
Java Version 1.7.0_67 from Oracle Corporation or
Java Version 1.6.0_45 from Sun Microsystems Inc. or
Java Version 1.6.0_33 from Apple Inc.

In part this is because the applet is unsigned. In the Bizarro world of Oracle, unsigned applets are treated as more dangerous than signed applets. This is backwards for two reasons. First, unsigned applets run in a restricted Java sandbox whereas signed applets are given unrestricted access to the system. Yes, the sandbox has been buggy and broken, but some security is better than none. Second, it shows a faith in the Certificate Authority system that is unwarranted.

Java on Mac Computers

The rest of this topic is a bit dated, so it has been suppressed by default.
At times Java on OS X was complicated as Java 6 came from Apple and Java 7 came from Oracle.

For many years this page had eight other methods of determining the installed version of Java.
But the page got really big, so they are no longer shown by default. But, they are still available:

Website created and maintained by Michael Horowitz mh _at_ javatester.org
Java and JavaScript are trademarks of Oracle in the US and other countries. This site is independent of Oracle.

Источник

Checking the Client JRE Software Version

There are many reasons to check if a particular version of the Java Runtime Environment (JRE) software is available on a client machine. For example, you might want to launch a different version of your rich Internet application (RIA) or redirect the user to a different page depending on the client’s JRE software version.

Use the Deployment Toolkit script’s versionCheck function to check if a particular version or range of JRE versions is installed on the client.

Function signature: versionCheck: function(versionPattern)

• versionPattern – String specifying the version or range of versions to check for, such as such as «1.4», «1.5.0*» (1.5.x family), and «1.6.0_02+» (any version greater than or equal to 1.6.0_02).

Usage: Creating a different user experience depending on the client’s JRE software version

In this example, a Launch button is created for the Notepad application only if the version of JRE software on the client is greater than or equal to 1.6. If not, the browser is redirected to oracle.com .

Note: Depending on the client’s operating system and version of the Java platform, you might be able to verify version information for JRE software at the major version level (for example, 1.6) or at a finer update level (for example, 1.6.0_10).

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How To Find and Verify Installed Java Runtime Version?

Java Runtime Environment is used to run Java applications. Java Runtime Environment is called JRE. There are different versions of JRE most recent major versions are 6,7,8. Some of the applications generally require a different version because of comp ability problems. In this tutorial, we will look at how to get JRE or Java versions from various operating systems. If you want to learn JRE and differences with JDK please read the following tutorial.

Java or JRE Version Numbers

Java uses a bit different version numbers. All java versions first numbers is 1 actual major version numbers change according to release which is current 8 . Example Java version number is like below.

Determine Java Version in Windows From Command Line

We have different methods to determine Java or JRE version in windows. The first way is running java command in command line with version information. We will also provide -version option like below.

We can see that cırrent JRE or Java version is 1.8.0_144 . Here we can call 8 as a major version number.

Determine Java Version in Windows From GUI

We can use the Java menu which resides in the Control Panel.

And then In the General tab click to About button. This will open a new window that will provide information about the current Java or JRE version.

We can see and get the following information.

• Version 8 specifies the main version of Java which is 8 in this example.
• Update 144 specifies the minor version which numbered as 144.

Determine Java Version Linux (CentOS, RedHat, Fedora, Ubuntu, Debian, Kali, Mint)

We will use java command from the command line to get information about Java or JRE installation of Linux distributions.

We can see that a lot of information about Java and the platform is provided.

• openjdk version «1.8.0_131» is the current version of Java. We can see that the Java implementation is OpenJDK which is an open version of Java for Linux distributions.
• ubuntu is the operating system where Java is created.
• OpenJDK 64-Bit Server VM specifies the Java CPU architecture which is 64 bit.

Determine Java Version Online

We can also use the currently installed Java version from the web. We will navigate to the following URL which is provided by Oracle Java. We will see a screen like below. First, we will click on the Agree and Continue button.

For security reasons, current popular browsers have disabled the Java or JRE by default. So Google Chrome, Mozilla Firefox, etc. will show a warning like Java is disabled or not installed . If Java is enabled for browser we will see the current version of Java without a problem.

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How to check Java version

This article describes some ways which you can use to check version of Java on your Windows computer. More exactly, the version of Java Runtime Environment (JRE) or Java Development Kit (JDK).

If you have OracleJDK installed on your computer, simply click menu Start, type about java into the search area, then click the About Java icon in the result. You can see the current version of Java in the following dialog:

Or you can go to Control Panel, switch to Large icons view and click the Java logo:

Then in the Java Control Panel dialog, click About button as shown in the following screenshot:

The second way (more familiar with programmers) to check Java version is opening a command prompt and type the following command:

Here, the version of Java is 1.8.0, and 201 is the update number. Each version can have several update numbers — the higher the more recent it is.

Note that “Java(TM) SE Runtime Environment” meaning that you’re using Oracle JDK. In case you’re using OpenJDK, the output should be:

If JDK/JRE is not installed or somehow the PATH environment variable is not updated for Java, you can see the following message:

Note that there can be multiple installations of JRE and/or JDK on a computer. In that case, the version of Java you see in the console is of the first JRE/JDK found in the list of environment variables.

To check the version exactly, you need to go to the bin directory of a JDK/JRE installation, for example:

cd C:\Program Files\Java\jdk1.8.0_201\bin

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About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook and watch his Java videos you YouTube.

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