.JNLP File Recovery

Have files been deleted due to a user’s error or software error? Have you formatted a disk by accident and need to know how to recover the files? Read our .JNLP file recovery guide for Windows, MacOS, Android and IOS in 2024.

JNLP File Recovery

What is a .JNLP file?

A JNLP file is created in the Java Network Launching Protocol (JNLP) format. It contains information such as the remote address for downloading a Java program (.JAR file) and the initial class to run. JNLP files are used for launching and managing Java programs over a network or on the web (e.g., an applet in a web browser).

What Are Common Causes of ".JNLP" Files Lost or Failure?

There are several common causes for ".JNLP" (Java Network Launch Protocol) files to be lost or fail:

  1. File corruption: ".JNLP" files can get corrupted due to various reasons such as improper download, storage device issues, or software errors. This can result in the file becoming unreadable or causing errors during execution.
  2. Missing dependencies: ".JNLP" files often rely on other files or libraries to function properly. If any of these dependencies are missing or not properly configured, it can lead to failure or errors when launching the application.
  3. Outdated Java version: ".JNLP" files require a Java Runtime Environment (JRE) to run. If the JRE is outdated or incompatible with the ".JNLP" file, it may fail to execute or display errors.
  4. Network connectivity issues: Since ".JNLP" files are launched over a network, any issues with the network connection can prevent the file from being downloaded or executed properly. This can include slow internet speeds, intermittent connectivity, or firewall restrictions.
  5. Security settings: Some security settings on the computer or network can prevent the execution of ".JNLP" files. This can include settings that block unsigned or untrusted applications, resulting in failure or warnings when launching the file.
  6. Incorrect file association: If the ".JNLP" file is not associated with the correct program or application on the computer, it may fail to open or execute properly.
  7. User error: In some cases, the failure of ".JNLP" files can be attributed to user error, such as accidentally deleting the file, moving it to a different location, or not following the correct steps to launch the application.

It is important to troubleshoot the specific issue and identify the root cause to resolve the problem with ".JNLP" files.

How to recover lost ".JNLP" files?

Sometimes while working with a computer, laptop or other stationary or mobile devices, you may encounter various bugs, freezes, hardware or software failures, even in spite of regular updates and junk cleaning. As a result, an important ".JNLP" file may be deleted.

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🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

By no means should you think that the only way to recover a ".JNLP" file is always to create it once more.

Use programs for recovering ".JNLP" files if a file was lost after accidental or deliberate deleting, formatting the memory card or the internal storage, cleaning the storage device, after a virus attack or a system failure.

Programs to recover ".JNLP" files

Looking for a way to get files back? In cases when files were deleted and they cannot be restored by using standard operating system tools, use Hetman Partition Recovery.

The tool recovers data from any devices, regardless of the cause of data loss.

Follow the directions below:

  1. Download Hetman Partition Recovery, install and start the program.

  2. The program will automatically scan the computer and display all hard disks and removable drives connected to it, as well as physical and local disks.

    File Recovery Software
  3. Double-click on the disk from which you need to recover ".JNLP" files, and select analysis type.

    Hetman Partition Recovery - Analysis Type
  4. When the scanning is over, you will be shown the files for recovery.

    Hetman Partition Recovery - Files that Can be Restored
  5. To find a file you need, use the program’s interface to open the folder it was deleted from, or go to the folder "Content-Aware Analysis" and select the required file type.

    Hetman Partition Recovery - Deep Scan
  6. Select the files you have been looking for and click "Recovery".

    File Recovery Software - Files List for Recovery
  7. Choose one of the methods for saving the files and recover them.

    Saving recovered files in Hetman Partition Recovery

How to open file with ".JNLP" extension?

Looking for how to open a stereo java Web Start File image file file?

Programs that open ".JNLP" files

Windows
Oracle Java Web Start Oracle Java Web Start
Any <a href=text editor"> Any text editor
Mac
Oracle Java Web Start Oracle Java Web Start
Any <a href=text editor"> Any text editor
Linux
Oracle Java Web Start Oracle Java Web Start
Any <a href=text editor"> Any text editor

Additional Information

  • File type: Java Web Start File

  • File extension: .JNLP

  • Developer: Oracle

  • Category: Web Files

  • Format: XML

  • HEX: 3C

  • ASCII: <

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Comments (1)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 18.12.2019 11:54 #
    Leave a comment if you have any questions about Recovering lost .JNLP files after deleting, cleaning or formatting!
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Vladimir Artiukh

Author: Vladimir Artiukh, Technical Writer

Vladimir Artiukh is a technical writer for Hetman Software, as well as the voice and face of their English-speaking YouTube channel, Hetman Software: Data Recovery for Windows. He handles tutorials, how-tos, and detailed reviews on how the company’s tools work with all kinds of data storage devices.

Oleg Afonin

Editor: Oleg Afonin, Technical Writer

Oleg Afonin is an expert in mobile forensics, data recovery and computer systems. He often attends large data security conferences, and writes several blogs for such resources as xaker.ru, Elcomsoft and Habr. In addition to his online activities, Oleg’s articles are also published in professional magazines. Also, Oleg Afonin is the co-author of a well-known book, Mobile Forensics - Advanced Investigative Strategies.

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Questions and answers

  • What is a .JNLP format and how is it used in web applications?

    The .JNLP (Java Network Launch Protocol) format is a file format used for launching Java applications over the internet. It is commonly used in web applications to enable the automatic download and execution of Java applications or applets on a client machine.

    When a user accesses a web page that includes a .JNLP file, the browser recognizes the file type and passes it to the Java Web Start software. Java Web Start then downloads the necessary Java application or applet from a specified location and launches it on the client machine.

    The .JNLP file contains information such as the location of the Java application or applet, the required Java version, any additional resources or libraries needed, and various application parameters. It acts as a descriptor that instructs the Java Web Start software on how to download, install, and run the Java application.

    Using the .JNLP format allows web applications to provide a seamless and secure way of distributing and launching Java applications over the internet, as it ensures that the client machine has the necessary Java runtime environment and dependencies to run the application.

  • Can you explain the structure and components of a .JNLP file?

    A .JNLP (Java Network Launching Protocol) file is an XML-based file used by Java Web Start to launch Java applications over the internet. It contains the necessary information and instructions for the Java Web Start client to download, install, and run the application.

    The structure of a .JNLP file typically consists of the following components:

    1. XML Declaration: The file starts with an XML declaration specifying the version and encoding used.
    2. JNLP Element: The root element of the file is . It contains various attributes and child elements that define the behavior and properties of the application.
    • codebase: Specifies the base URL where the application and resources can be found.
    • href: Defines the relative or absolute URL of the .JNLP file itself.
    • version: Specifies the version of the JNLP file format.
    • information: Contains information about the application, such as title, vendor, and description.
    • security: Specifies the security requirements and permissions needed by the application.
    • resources: Defines the required JAR files, native libraries, and other resources needed by the application.
    • application-desc: Describes the main entry point of the application, including the class name and arguments.

    Information Element: Within the element, various child elements provide additional details about the application.

    • title: Specifies the title of the application.
    • vendor: Defines the name of the application vendor.
    • description: Provides a brief description of the application.
    • homepage: Specifies the URL of the application's homepage.
    • icon: Defines the icon(s) associated with the application.
    1. Security Element: The element specifies the security requirements and permissions needed by the application to run properly. It may include elements like , , , etc., depending on the required permissions.
    2. Resources Element: The element defines the required JAR files, native libraries, and other resources needed by the application. Each resource is typically specified using the , , or element, along with attributes like href (URL of the resource), version (version number), and main (whether it is the main JAR file).
    3. Application-desc Element: The element describes the main entry point of the application. It specifies the main class that should be executed and any arguments that need to be passed to it.

    These are the basic components of a .JNLP file. The file provides the necessary instructions for the Java Web Start client to download and launch the Java application securely over the network.

  • What are the advantages and limitations of using .JNLP formats for deploying Java applications?

    Advantages of using .JNLP formats for deploying Java applications:

    1. Cross-platform compatibility: .JNLP files can be used to deploy Java applications on any platform that supports Java, including Windows, Mac, and Linux. This eliminates the need to develop and maintain separate installers for different operating systems.
    2. Easy installation and updates: With .JNLP, users can simply click on a link to launch the application, without the need for manual installation. Additionally, the application can be automatically updated when a new version is available, ensuring users always have the latest features and bug fixes.
    3. Security: .JNLP files can be digitally signed, providing a level of security and authenticity for the application. This helps users trust and verify the source of the application before running it.
    4. Network efficiency: .JNLP files utilize Java Web Start technology, which allows applications to be launched and run directly from the web. This reduces the need for large downloads and saves network bandwidth.

    Limitations of using .JNLP formats for deploying Java applications:

    1. Dependency on Java Web Start: .JNLP files rely on Java Web Start technology, which is not universally supported or enabled by default on all systems. This means users may need to install or enable Java Web Start before being able to run the application.
    2. Lack of control over the user's environment: When using .JNLP files, the application runs within a restricted environment provided by Java Web Start. This may limit access to certain system resources or capabilities, potentially affecting the functionality of the application.
    3. Limited offline capabilities: .JNLP files are primarily designed for online deployment, as they rely on the availability of the internet to download and update the application. Offline usage may be limited or require additional configuration.
    4. Compatibility with newer Java versions: As Java evolves, there may be compatibility issues between older .JNLP files and newer Java versions. This can result in the need to update and modify the .JNLP files to ensure compatibility with the latest Java runtime environments.
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