Пишет java runtime environment

How to Fix «Java Runtime Environment not found» error

In this post, we will solve the «Java Runtime Environment not found error». This java error is one of the common errors faced by developers or end-users. Whenever you try to install any software which requires java like eclipse or Minecraft. Also, if you are new to java development, JDK or Java Development Kit is necessary for you.

Following this tutorial will help you to resolve all Java runtime errors. Additionally, you will learn to install, remove and set java variables in Windows10 and Ubuntu.

These are the very common errors you will find related to Java.

• java runtime environment not found
• java runtime environment not found windows 10
• eclipse java runtime environment not found
• eclipse java runtime environment not found path
• java SE runtime environment not found
• java runtime environment not found at bin javaw.exe
• unable to load java runtime environment
• cannot determine a valid java home
• java runtime environment not found mac

Let’s understand some basic concepts of Java runtime first. Check out this post, if you are getting a java command not found error.

What is a runtime environment?

• JRE (Java Runtime Environment)
• CLR (Common Language Runtime) for .net framework

The target would be JRE or CLR for your program, need to decide by you. As soon as you execute any program, it’s in run time.

JRE vs JDK

How to install Java runtime environment step by step

Let’s solve 1 st reason for «Java runtime environment not found», Because java is not installed.

First, check for any pre-installed java version —

Open the command prompt with «Run as administrator» and run java command.

How to install java runtime environment in Windows 10

Once Download completes. Browse to the «jdk-15.0.1_windows-x64_bin.exe» file and double-click on it, to run the installer. Click Next.

I recommend keeping «C:\Program files\java\jdk-15.0.1 (64-bit)» as the default installation folder. Select Next.

You may select different installation folders also. For example, if you are installing a second instance of java software. Click on change and browse for the target folder.

Let installation complete, it may take a few minutes.

Click close. Now you are done with java installation on windows 10.

How to set the environment variable for java in windows10

Set the Environment variable for java in windows 10 by these steps —

Type «environment» in the search window. Click «open» on «Edit the system environment variables«

Click on Environment variables.

Select «Path» > Then click Edit.

Select New > Give path of java installation directory > For example, «C:\Program files\java\jdk-15.0.1\bin» in my case. If you have selected a different folder for java installation in step4. You can enter your path to the bin folder.

Click OK.

Set «classpath» for java. Click «New» in the environment variable window. It allows to set up the new environment variables.

In «Variable name», enter «classpath«. Also in «variable value» provide path to your java installation till «lib» folder. In my case it is «C:\program files\java\jdk-15.0\lib > Select OK

Close all open environment variables windows by selecting OK.

How to check what version of java I have?

Installation and java variables have been set up. Now, Let’s validate the java installation and version.

Open the command prompt with «run as administrator» rights in windows 10.

Run the «java» command to check your Java and JRE (Java Runtime Environment) version.

Check java SDK version with javac command

Video tutorial-JRE error solved for Windows

«Java Runtime Environment not found» error fixed for windows 10

Select the java program and click Uninstall.

Java software will go from the window. You can clean up java variables also, set up in step10 and 11 earlier.

How to install java runtime environment in Ubuntu 20.04

There are two ways to download and install java or JDK in Ubuntu 20.04

A.) Using the apt command

B.) Download the Oracle JDK package and install it manually

Let’s see both options one by one-

A.) How to install java or JRE in Ubuntu 20.04 using the apt command

To install Java in Ubuntu using the repository, Follow these commands

Update package index using apt command

Check if you have any old java versions installed in the system. In my case, java is not installed.

Command ‘java’ not found, but can be installed with:

sudo apt install openjdk-11-jre-headless # version 11.0.9.1+1-0ubuntu1~20.04, or
sudo apt install default-jre # version 2:1.11-72
———————-output-truncated————————————

Run the «apt» command to install java or JRE. I will install default-jre version 2:1.11-72 in my Ubuntu system from the list.

$ sudo apt install default-jre

Select «Y» and press Enter. Let installation complete. it will take a few minutes.

Check the java version

output

How to Remove java from Ubuntu 20.04

Run apt command to remove JRE package installed. Press Y and then enter.

$ sudo apt autoremove "JRE package name"

B.) How to install the latest java or JDK in Ubuntu 20.04 from oracle (manually)

Java JRE download steps —

Visit oracle.com and download JDK 15 or the latest available .deb and transfer to your system. I am downloading Debian package jdk-15.0.1_linux-x64_bin.deb.

Alternatively, you can download java using wget command.

$ sudo wget "download link"

Reference output

Rename the .deb file using mv command, if required. Then install the Debian package using the dpkg command.

$ sudo dpkg -i ".deb-file-path"

output

Default installation directory path of java would be «/usr/lib/jvm/jdk-15.0.1/«. So, make a note of it, as it will be required to set up a Java_HOME variable.

How to set the «JAVA_HOME» variable in Ubuntu 20.04

Set the JAVA_HOME variable for all users in Ubuntu by editing the environment file.

Edit /system/environment file

Add path «/usr/lib/jvm/jdk-15.0.1/bin» to the last of the environment file. Then, save and exit.

Run source command to execute changes made in the environment file.

$ sudo source /etc/environment

Check your java version

Remove java runtime environment package using dpkg command

Run the dpkg command with the —purge option to completely clean java from Ubuntu 20.04

$ sudo dpkg --purge "package-name"

Video Tutorial — JRE error solved for Ubuntu

Video on «How to fix java runtime environment error in Ubuntu 20.04»

Frequently Asked Questions (FAQs)

Where is the java runtime environment on Windows 10?

The default installation folder for java runtime is «C:\Program files\java\jdk-15.0.1\bin» in the case of windows 10.

What does Java Runtime Environment do?

Java Runtime Environment (JRE) helps to run java programs like the eclipse.

What is the java runtime environment used for?

Java runtime environment helps to run java programs like Tomcat, eclipse and Jenkins.

What is the java runtime environment?

Java runtime environment JRE is a software that runs on the operating system. Which provides class libraries and resources to run java programs.

How to set the java runtime environment in windows 10?

Type «environment» in the search window. Click «open» on «Edit the system environment variables«
Click on Environment variables.
Select «Path» > Then click Edit.
Select New > Give path of java installation directory > For example, «C:\Program files\java\jdk-15.0.1\bin«
Click OK

Ending notes

I hope after reading this article, you will be able to solve the «Java Runtime Environment not found error». Because majorly reasons for java related errors are, either Java is not installed or the java variable is not set.

if you still have issues, please comment and let me know, I will try to help you.

About The Author

Dev

Hi, My Name is Dev and as an Information Technology professional, My Life revolves around Gadgets, Servers, Storage, Software, Operating system, Internet and Cloud computing. My philosophy is “being healthy” and follow your “passion or hobbies” to make your life interesting. Please feel free to contact me for any questions, feedback and suggestions.

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How to fix JRE not found

Java Runtime Environment, or JRE is a piece of software that provides the necessary functions and system resources for a typical Java program to run. It is widely used in developing and distributing Java programs.

When you try to run a software written in Java without setting up the JRE correctly before that, the error “Java Runtime Environment not found” error would pop up. The error message basically means that you have not installed JRE on your computer, or in case you did, the system can’t find it. It’s also possible that the application which is being installed is not compatible with the Windows operating system or the application has a problem.

In this article, we will show you how to fix the “Java Runtime Environment not found” error on Windows and Ubuntu.

JRE not found solution: Add JAVA_HOME environment variable

Java Runtime Environment relies on an environment variable named JAVA_HOME in otder to locate where to find resources for programs written in Java. In many cases, a corrupt JRE setup or Windows misconfiguration may cause the JAVA_HOME variable to be deleted, hence the system cannot find JRE when needed.

Before proceeding, please verify whether you actually have Java installed or not by opening C:Program FilesJava and look for a folder called jre6, jre7 or jreX with X being a version number. If it’s there and the folder has files inside it, then JRE is installed. Remember the installation path of JRE as we will need it later.

In order to add JAVA_HOME back to the list of environment variables, follow the instructions below.

First, on the Desktop, right-click in My Computer (This PC) icon, then select Properties > Advanced system settings on the left side.

In the new System Properties, select Advanced tab, then click on Environment Variables button to open up the list of all environment variables.

Fix JRE not found: Reinstall JRE

There are numerous people who has faced the same problem, and a smart guy named appleoddity from WhatTheTech came up with an automated script that fixes these kind of problem once and for all. Follow the instruction below if the solution above does not work for you.

• Completely uninstall every single Java installation from your computer. By Java, I mean both the JRE and JDK. You can use the built-in Programs and Features on Windows or any third party utility (no need for a paid program though).
• Download fixjava.bat from this page and run it. If you are using Windows Vista or Windows 7, 8, 10, you must right-click on the file and select Run As Administrator.
• Once the installation has done, download a fresh Java Runtime Environment installer to your computer and reinstall it. Notice that you have to select the correct 32-bit or 64-bit version that matches your system architecture.

Install JRE on Ubuntu

Installing Java in Linux should be easy using package managers, such as apt, yum, or pacman, depending on your Linux distribution. However, there are times that you may encounter “java: command not found” error, even though you think you have installed it. We have covered this problem before, if you’re encountering it, check out our guide on How to fix “java command not found”.

We hope that the information above is useful to you and helped you fix Java Runtime Environment not found error. We usually don’t write about Java programming, but we have covered how to convert JSONObject to String that may be helpful to Java beginners.

If you’re seeing a “not found” error, you may want to check out our other guides to similar error messages with curl, AWS CLI.

If you have any questions, then please feel free to ask in the comments below.

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