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How To Fix The “Java Command Not Found” In Linux? – Its Linux Foss

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bash java command not found

If you are trying to run a Java program from the Bash terminal and you receive the error “java: command not found,” it may be because Java is not installed on your system or it is not in your system’s PATH.

Here are some steps you can take to resolve the issue:

  1. Verify that Java is installed on your system by running the command “java -version” in the terminal. If Java is not installed, you will need to download and install it from the official website.

  2. If Java is installed, but you still receive the error, try adding the directory where the Java executable is located to your system’s PATH. You can do this by adding the following line to your .bashrc or .bash_profile file:

    export PATH=$PATH:/path/to/java/bin

    Replace “/path/to/java/bin” with the actual path to the Java executable directory.

  3. After making changes to your .bashrc or .bash_profile file, you will need to source the file for the changes to take effect. You can do this by running the command “source ~/.bashrc” or “source ~/.bash_profile” in the terminal.

  4. Finally, try running the “java” command again in the terminal to see if the issue has been resolved.

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javac \”command not found\” error

Why is Java command not found?

The “Java command not found” error occurs when the system is unable to locate the Java executable in the command line. There are a few possible reasons for this error, including:

  1. Java is not installed on your system: If you do not have Java installed on your system, then the Java command will not be available. You can check if Java is installed on your system by running the command “java -version” in the command line. If Java is not installed, you will need to download and install it from the official website.

  2. Java is not in the system PATH: Even if Java is installed on your system, the Java executable might not be in the system PATH, which is a list of directories that the system searches when trying to find an executable. To fix this issue, you can add the directory containing the Java executable to the system PATH.

  3. Typing error: Another possible reason for the error message is a typing error. Make sure that you are typing the correct command and that there are no typos in the command.

  4. Permissions issue: It’s possible that the user executing the command does not have sufficient permissions to execute the Java command. In this case, you may need to run the command as an administrator or grant appropriate permissions to the user.

By addressing the above possible causes, you should be able to resolve the “Java command not found” error.

Why is bash command not found?

If you receive an error message saying “bash: command not found” when running a command in your terminal or command prompt, it typically means that the command you are trying to run is not installed on your system or the command’s location is not in your system’s PATH.

Here are a few possible reasons why you might be getting the error message:

  1. The command is not installed: The command you are trying to run may not be installed on your system. You can check if a command is installed by using the which command or the where command (on Windows). For example, to check if the git command is installed, you can run which git or where git. If the command is not installed, you will need to install it.

  2. The command is not in your PATH: Your system’s PATH is a list of directories where your system searches for executable files. If the directory containing the command you are trying to run is not in your PATH, your system won’t be able to find it. You can check your PATH by running echo $PATH. If the directory containing the command is not in your PATH, you can add it by editing your shell profile file (e.g. ~/.bashrc or ~/.bash_profile on Unix/Linux systems) and adding the directory to the PATH variable.

  3. The command is not spelled correctly: Make sure you are typing the command correctly. The command name is case-sensitive, so git is not the same as GIT. Also, make sure you are not misspelling the command.

  4. The command is not compatible with your operating system: Some commands are only available on specific operating systems or may require certain dependencies that are not installed on your system.

If you’re still having trouble after checking these possible reasons, you may want to seek further assistance or do additional research.

How to set JAVA_HOME in Linux?

To set the JAVA_HOME environment variable in Linux, follow these steps:

  1. Determine the path to the Java installation directory. For example, if you installed Java in /usr/lib/jvm/java-11-openjdk-amd64/, then this is the path to your Java installation directory.

  2. Open a terminal and type the following command:

bash
sudo nano /etc/environment

This will open the /etc/environment file in the nano text editor with superuser privileges.

  1. Add the following line at the end of the file:
makefile
JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64/"

Replace the path with the path to your Java installation directory.

  1. Save the file by pressing Ctrl+O and then exit nano by pressing Ctrl+X.

  2. Load the environment variables into your current session by typing the following command in the terminal:

bash
source /etc/environment
  1. To check if JAVA_HOME has been set correctly, type the following command:
bash
echo $JAVA_HOME

This should display the path to your Java installation directory.

Note: Setting JAVA_HOME in the /etc/environment file will make it available system-wide. If you only want to set JAVA_HOME for your user, you can add the same line to your ~/.bashrc file instead.

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Java command not found centos 7

If you are trying to run a Java command on CentOS 7 and you receive an error message saying “Java command not found”, it’s likely that Java is not installed on your system or the Java executable is not in your system’s PATH.

To check if Java is installed on your system, you can run the following command in the terminal:

java -version

If Java is not installed, you can install it by following these steps:

  1. Update the package index on your system:

    sql
    sudo yum update
  2. Install the Java Development Kit (JDK) using the following command:

    sudo yum install java-devel
  3. Verify that Java is installed correctly by running the following command:

    java -version

If Java is installed but you still receive the “Java command not found” error, you may need to add the Java executable to your system’s PATH. To do this, you can edit the /etc/profile file and add the following lines at the end:

bash
export JAVA_HOME=/usr/java/latest export PATH=$PATH:$JAVA_HOME/bin

Save the file and then run the following command to apply the changes:

bash
source /etc/profile

After this, you should be able to run Java commands without any issues.

Sudo java command not found

If you are getting the error message “sudo: java: command not found” when trying to run a Java command with sudo, it is likely that the Java executable is not included in the system’s PATH environment variable or that Java is not installed on the system.

To check if Java is installed on your system, you can run the following command:

java -version

If Java is not installed, you will need to install it before you can run Java commands with sudo. To install Java on Ubuntu, for example, you can use the following command:

csharp
sudo apt-get install default-jdk

If Java is installed but the system is unable to find the executable, you may need to add the path to the Java executable to the system’s PATH environment variable. You can do this by adding the following line to your .bashrc file:

ruby
export PATH=$PATH:/path/to/java/bin

Replace “/path/to/java/bin” with the actual path to the directory containing the Java executable. Once you have added this line, you can reload your .bashrc file by running the following command:

bash
source ~/.bashrc

This should allow you to run Java commands with sudo without encountering the “sudo: java: command not found” error.

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