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[Solved] Error: Could not find Java SE Runtime Environment

In this post, I will be sharing how to fix error: could not find java se runtime environment. This error may occur if you are trying to run a simple java -version command or when you try to open a .jar file using the «java -jar xxx.jar» command in the command window. You will face the following message:

[Fixed] Error: could not find java se runtime environment

1. Go to «Programs and Features» and uninstall all the previous java versions. Check the location «C:/Program Files/. » and delete all the java folders inside it.

2. Also, clean up your registry (delete the java key present inside it).

3. Go to Start and then click on the Run.

5. Go to the path «HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Uninstall» . Uninstall folder will contain many registry entries within curly brackets as shown below.

6. Now, click on the Edit tab and then Find (Note: Highlight Uninstall folder before searching for the particular registry.)

7. Enter version string as value to find corresponding registry entry to be deleted.

Steps for finding registry keys

a. Any version of Java 7

Follow format 7.0.xxx
where xxx can be 100, 120, 130, 140, and so on

Please refer to below examples:
Type 7.0.100 in the search field, it will find registry key for Java7 update 10
Type 7.0.120 in the search field, it will find registry key for Java7 update 12
Type 7.0.180 in the search field, it will find registry key for Java7 update 18

b. Any version of Java 6

Follow format 6.0.xxx
where xxx can be 100, 120, 130, 140, and so on

Please refer to below examples:
Type 6.0.100 in the search field, it will find registry key for Java6 update 10
Type 6.0.120 in the search field, it will find registry key for Java6 update 12
Type 6.0.180 in the search field, it will find registry key for Java6 update 18

c. Any version of Java 5

Follow format 1.5.0.xxx
where xxx can be 100, 120, 130, 140, and so on

Please refer to below examples:
Type 1.5.0.100 in the search field, it will find registry key for jre1.5.0_01
Type 1.5.0.120 in the search field, it will find registry key for jre1.5.0_12
Type 1.5.0.180 in the search field, it will find registry key for jre1.5.0_18

8. Once you find the registry key, highlight that key and then Right-click on it and choose Delete.

9. Confirm the Delete and click Yes.

After following the above steps, now, reinstall Java and set System variable JAVA_HOME in your machine to your JRE(or JDK) path.

Please find the example below:

JAVA_HOME- C:\Program Files\Java\jdk1.7.0_80

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Path- C:\Program Files\Java\jdk1.7.0_80\bin

How to Check Error is Resolved

You can check if the above solution is correct by executing the following commands in the command window.

1. By printing JAVA_HOME in the command window.

2. Checking the version of Java in the command window.

That’s all for today, please mention in the comments in case you know any other way to solve the error: could not find java se runtime environment.

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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?

Runtime basically means everything you require to run a program. Which includes environment variables, directory structure, common libraries etc. This can also be a virtual machine like

  • 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

JRE JDK
Stands for Java Runtime Environment Stands for Java development kit
To run Java programs, you need JRE Helps to build Java programs and applets
Platform dependent contains libraries and supporting tool Platform dependent contains tools development and debugging
JRE does not contain a development kit. JDK includes JRE also to execute the program

Simple JRE VS JDK

What are the causes of the «Java Runtime environment not found» error

  1. Java is not installed in your system
  2. Java installation not completed (due to errors)
  3. Environment variables of Java are not set
  4. Java conflict due to more than one Java Runtime installation

Because JRE is platform-dependent, I have covered java installation, variable setup and un-installation for Windows and Ubuntu both.

Choose Windows 10 or Ubuntu 20.04 from the post and follow step by step to get java issues resolved.

Java download

Before installation, first, we need to download java

Step1

Visit oracle.com and download JDK 15 or the latest available for your system. I am downloading it for Windows 10 (64-bit). The latest available versions of java are listed in the screenshot.

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.

Step2

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

Step3

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.

Step4

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.

Step5

Let installation complete, it may take a few minutes.

Step6

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 —

Step7

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

Step8

Click on Environment variables.

Step9

Select «Path» > Then click Edit.

Step10

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.

Step11

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

Step12

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.

Step13

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

Step14

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

How to uninstall java from Windows 10

In case, you are not happy with your old java or JRE version and want to install a new. For that, you need to remove the old Java version.

Cleanup of Java from Windows 10 is pretty easy. Follow these steps to remove java from your system.

Step15

Search add or remove programs and click open

Step16

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

Step17

Update package index using apt command

Step18

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

output

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

sudo apt install openjdk-11-jre-headless # version 11.0.9.1+1-0ubuntu1

Step19

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.

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

Step20

Check the java version

output

How to Remove java from Ubuntu 20.04

Step21

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

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

Step22

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.

Reference output

Step23

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

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.

Step24

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.

Step25

Check your java version

Remove java runtime environment package using dpkg command

Step26

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

Video TutorialJRE error solved for Ubuntu

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

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