File Extension Library

.JAR File Extension

  • Developer by: Oracle
  • Category: Executable Files
  • Format: Zip

What are .JAR files and how to open them?

Can't open .JAR file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .JAR file.

What is a .JAR file extension?

.JAR file extension is created by Oracle. .JAR has been classified as Executable Files. The format of .JAR file is Zip.

.JAR is Java Archive File

A JAR file is a Java archive (JAR) file used by the Java Runtime Environment (JRE), a framework used for executing Java programs. JAR files may serve as program libraries or as standalone programs that run if the JRE is installed on the computer or mobile device.

JAR files can contain .CLASS files, application resources, and an optional manifest file (META-INF/MANIFEST.MF). They are compressed using .ZIP compression and may optionally be digitally signed using the jarsigner tool included with the Java SDK. JAR files may be created with the jar tool, and they can be accessed using Java's java.util.jar API.

JAR files are used for some mobile games supported by Java-enabled mobile devices. They are also used by Mozilla Firefox, Thunderbird, SeaMonkey, and Sunbird to store themes and add-ons.

NOTE: The Java Runtime Environment is also referred to as the Java Virtual Machine (JVM). Sun Microsystems, the original developers of the JRE/JVM, were acquired by Oracle.

List of all softwares that can open the Java Archive File
File Viewer Plus
Oracle Java Runtime Environment
Corel WinZip 23
WinRAR 5
Corel WinZip Mac 6.5
Oracle Java Runtime Environment
Oracle Java Runtime Environment
File Viewer for Android

How to fix problems with .JAR files

  1. You need to update the application that you normally use to open .JAR files. Only the latest version of the software supports the current .JAR file format
  2. You need to check the .JAR file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)