How to run java without installing Java Runtime (JRE).

f you only want to run a JAR file and do not want to fully install Java on your system, you have a couple of lightweight options:

• Use a Portable Java Runtime:
  Download the “jPortable” Java Runtime Environment from PortableApps.com, along with the “jPortable Launcher.” This setup allows you to run JAR files without installing Java system-wide-just extract and run from a folder1, 4. jPortable64 allows you to easily add a 64-bit Java® runtime environment to your portable device. No Java® runtime environment needs to be installed on the local machine and no admin rights are required. JARs can be run using our jPortable Launcher.

• Extract and Use Java Without Installing:
  Download the Java Runtime (JRE) or Java Development Kit (JDK) as a ZIP or tar.gz archive (Oracle often provides these). Extract it to a folder, then run your JAR file using the included java.exe without a full installation. For example, from the command line:

  text

  path\to\java\bin\java -jar yourfile.jar


  This method avoids system changes and keeps Java self-contained 1, 4.

Both options let you run your JAR file with minimal system impact and no permanent installation.