How to check the version of java. Everything about Java. What is, how to check the version, update and how to fix errors, for example java applet not loaded

Hello to all! Today I will try to write a large-scale article about Java. After all, many applications now use it.

And sometimes errors occur during work.

Java - what is and what is this program for

Java is a programming language or technology in which online applications are written. Those. chats on sites, games, downloading files (including photos, videos) and many other things.

The advantage of this technology:

1. Independence of code, operating system and devices i.e. it allows you to run applications on any device, regardless of operating system;
2. And security (this is most likely used in many banks when connecting), because if the operation exceeds the authority, an immediate interruption will occur.

And of the shortcomings, the speed of execution, although there were improvements.

Perhaps there is still, but these are the main ones from official sources.

And here's the story:

How to update Java to the latest version (or install)

In order to update java (or install) you need to go to. And click download java.

And more ... In browsers that are developed on the chromium engine, java may not work. If the version is old, then you can try in the address bar by entering chrome: // flags / # enable-npapi next paragraph " Enable NPAPI ".

But most likely, you will have to download an old version of the browser, look for add-ons, or use Intenet Explorer.

Installation is simple, just click install.

You can also update through the control panel:

And in the application there is an Update tab.

By the way, here is the instruction on how to enable it in browsers.

How to check Java version

To check the version, you can also go to the control panel, select java.

About button.

In the window that opens, we see the version.

How to remove Java

Java is removed the usual way, through the uninstaller, but if you could not uninstall, then use the utility.

This is how the uninstallation looks like via JavaUninstallTool.

Java errors

Here I will try to make out common mistakes during work. If suddenly you had mistakes and you solved them, also do not hesitate to write in the comments, we will help each other, so to speak ...

Java applet not loaded

First, follow the usual steps, make sure that the required version of java is installed, and the firewall does not block. Reboot your computer and router. Further, if all else fails, go to the control panel, select java.

If you use a proxy, then you need to register a proxy in General - Network Settings - Use proxy server.

There are also cases when it is necessary not to store temporary java files on the computer, but to store them on the bank's server, for example, but this is an individual situation. In such situations, you need to read the instructions on the banks' websites. And in general, always, if you configure java for a bank, then read the bank's individual instructions.

Error 1603: Java update did not complete

In this situation, uninstall java using the app, or you can try manually through the control panel. Then reinstall it.

Java is not installed

• Here also try to uninstall if there is an old version and reinstall it. When installing, try to install as administrator.
• Make sure you have full access to all folders.
• Download the offline installer and try installing it.
• If all else fails, make sure that nothing is interfering with the installation, for example: antivirus, firewall.
• All applications require NET Framework and Microsoft Visual C ++, try updating them.

Is not an internal or external team

In this error, copy the path to the program, mine is: C: \ Program Files (x86) \ Java \ jre1.8.0_144 \ bin

We are looking for PATH and click edit.

Be careful here now!

For example, here is my piece of code: C: \ ProgramData \ Oracle \ Java \ javapath; C: \ Program Files (x86) \ Intel \ iCLS Client \; C: \ Program Files \ Intel \ iCLS Client \;

Those. each parameter must be separated by a semicolon. If you are not sure of your abilities, copy this line somewhere, just in case.

So what we do:

1. We go to the end of the line
2. If there is no semicolon, if there is, we write our path C: \ Program Files (x86) \ Java \ jre1.8.0_144 \ bin (your path should be here) and put a semicolon at the end.

You can also try this path: C: \ ProgramData \ Oracle \ Java \ javapath;

(eventually getting to the point where I can write simple little programs for Android or web) but I managed to get java running on my computer (from past experiments).

I'm not sure which java version I have and would like to know if there is a command to see the installed and active Java version. Also, which version works best? All this on 32-bit Ubuntu 12.04

EDIT:
So it looks like I have 6 and 7 when using open 7. I want to use openjdk 7, so how do I uninstall openjdk 6? Is it just through USC good enough or is there a command that needs to be run?

This command should tell you what is currently providing virtual machine java (java) and Java compiler (javac):

File / etc / alternatives / java / etc / alternatives / javac

This assumes that the "alternatives" system is working as expected, which might not be the case, depending on how Java got messed up in the past. To test this, run:

File `which java javac`

If the alternatives system is working correctly and Java is being used, you should see:

/ usr / bin / java: symbolic link to `/ etc / alternatives / java" / usr / bin / javac: symbolic link to `/ etc / alternatives / javac"

Otherwise edit your question, to provide detailed information... It should then be possible to give a more specific answer.

You can uninstall openjdk-6 using Software Center. There are several packages associated with it, so you may need to remove several packages. (All openjdk-6 packages are listed here.)

Or you can use the command line:

Sudo apt-get remove openjdk-6 - \ * icedtea-6 - \ *

However, whichever method you use, you can check first to see what depends on those packages. You may have installed software which needs version 6. (Maybe not, but maybe.)

You can check it out, by simulating delete operation on the command line:

Apt-get -s remove openjdk-6 - \ * icedtea-6 - \ *

This will show you the effects of removing those packages, including other packages removed. (You will notice that since this is a simulation, you do not need sudo.)

If you want you to continue to use Java content online in your web browser (this is not the same as JavaScript), before uninstalling any icedtea-6- or icedtea-6- or openjdk-6- packages (except, maybe openjdk-6-jdk), you should make sure that you have installed icedtea-7- packages that match all installed icedtea-6- packages.

The easiest way:

update-java-alternatives -l shows all Java versions you have installed.

java -version shows you the Java version you are using.

java -showversion shows you the Java version you are using and help.

This will usually be OpenJDK.

Java -version javac -version

These commands display the version of java (the interpreter that executes Java programs) and javac (the compiler that creates them).

See the image above for details.

This is what I did, this worked for me:

Open a terminal:

control + alt + T

Then enter (or copy and paste from here) these commands one at a time:

Sudo rm / var / lib / dpkg / info / oracle-java7-installer * sudo apt-get purge oracle-java7-installer * sudo rm /etc/apt/sources.list.d/*java* sudo apt-get update sudo add-apt-repository ppa: webupd8team / java sudo apt-get update sudo apt-get install oracle-java7-installer

Then, to be safe, I would reboot.

To find your java version type

Java -version

and you should see an output similar to this:

Java version "1.7.0_04" Java (TM) SE Runtime Environment (build 1.7.0_04-b20) Java HotSpot (TM) 64-Bit Server VM (build 23.0-b21, mixed mode)

Although yours will be in 32 bits.

I highly recommend using Java 7, but updates will also try to install Java 6. Everything is fine. But your default should still appear as 7. Everything I chose works as long as your graphics card drivers are working.

• Are PPAs safe to add to my system and what red flags should I follow?

In the process of performing tasks on a computer or laptop, Java is sometimes required. One of the most common reasons is the correct operation of the browser - each of them can use their own copy of the program, so you may need to check the Java version.

What is Java and why is it needed?

Before understanding how Java validation is performed, it is helpful to understand what the program is and what it is for. Thanks to the use of this program, special technology, which allows you to increase the level of reliability of the device, as well as the speed of work. Currently, there are many programs that require Java, as well as websites that require at least a certain version to work correctly.

Checking the Java version is very simple, and regardless of the type of operating system, it can be done in two ways - online or offline.

Checking using the site

The Java technology company, in addition to releasing regular updates, has added a check feature to its official website. installed version programs. In order to get to the page where the Java version is checked, you need to use the site search, or a direct link.

On this portal there is a button offering to launch an application that will determine the version of the program. By agreeing to launch in the pop-up browser security window, after a few seconds the page will display the result of the request, in which the version and update number will be written in brackets.

Offline verification

Not being able to go online, you can use the offline method. On the Windows check The Java version is carried out through the command line - you can start it by finding it in the "Start" - "All Programs" - "Standard" menu, or using the "Run" item, where to write the line cmd.

In the window that opens, you will only need to enter the following command: java -version... Several different messages may appear as a result of the request. If there is one of the latest versions of the program, the command line will display a list of installed instances, each of which will have its version indicated. If there is no installed program on the computer, or one of the first versions is used, an error message will be displayed.

In order to find out the Java version on MacOS and Linux operating systems, you need to use the terminal, where you will need to enter a similar line. The result of executing the query will be the same as on Windows.