- 1 year ago
Running a Java program with different JRE?
To run a Java program with a different Java Runtime Environment (JRE), you need to specify the path to the desired JRE executable when executing the program. This allows you to choose a specific JRE version or installation to run your Java application.
Here's how you can run a Java program with a different JRE:
Locate the Desired JRE:
First, make sure you have the desired JRE version installed on your system. The JRE installation typically contains ajava
executable in itsbin
directory.Specify the JRE Path:
When executing your Java program from the command line, provide the full path to thejava
executable of the desired JRE. This will override the default JRE used by the system.For example, if you have JRE version 11 installed at
/path/to/jre11
, you can use the following command to run your Java program:bash/path/to/jre11/bin/java -cp /path/to/your/app.jar com.yourpackage.YourMainClass
Replace
/path/to/jre11
with the actual path to your desired JRE installation, and adjust the classpath (-cp
) and main class (com.yourpackage.YourMainClass
) according to your Java program.Setting JAVA_HOME Environment Variable (Optional):
Optionally, you can set theJAVA_HOME
environment variable to the path of the desired JRE installation. This can be helpful if you frequently switch between different JRE versions.For example, in Unix/Linux/Mac, you can add the following line to your shell profile (e.g.,
.bashrc
,.bash_profile
, or.zshrc
):javascriptexport JAVA_HOME=/path/to/jre11
In Windows, you can set the
JAVA_HOME
variable using the System Properties.By setting
JAVA_HOME
, you can use thejava
command directly without providing the full path:bashjava -cp /path/to/your/app.jar com.yourpackage.YourMainClass
Remember that the specific steps may vary depending on your operating system. The key is to specify the path to the desired JRE executable when running your Java program, either by providing the full path explicitly or by setting the JAVA_HOME
environment variable.