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How do I open a Java JAR file?Follow these steps to open a JAR file and extract the contents to the local filesystem:
Is a JAR file just a ZIP file?A Java JAR file is really just a ZIP file. Java applications can be made up of hundreds or even thousands of classes, property files and other artifacts. When a Java application is packaged, all of those resources are zipped up into a single, compressed file. To open a JAR file you can use any standard ZIP utility. Of course, Java being Java, we can’t just call a ZIP file a ZIP file. We must call it something cute. Thus, in Java, we create JavaBeans. And where should JavaBeans be stored? They should be stored in a jar file. That’s why we use the term JAR in Java, and not ZIP. But the fact is, if you open a Java JAR file, you’re really just opening a ZIP file that contains all of the resources a Java app needs to run. What does JAR stand for?JAR is an acronym to abbreviate the term Java ARchive. Because JAR is an acronym, we capitalize each letter. We also pronounce the full word “jar.” We do not say each letter individually as you do with JDK or JRE. A Java JAR file uses a standard compression algorithm used by programs like 7-Zip and Gzip. Run or open a JAR file?Sometimes when a person uses the term “open a JAR file” they really mean they want to run a JAR file. To run a JAR file you must first install Java on your computer. With Java installed, run the JAR file on the command line with the following command: java -jar jarfilename.jar This will search for the main-class in the JAR file and run it. Extract the contents of a JARWhen you install Java, the Java JAR utility is installed as well. This utility can both create JAR files and open JAR files. To extract the contents of a JAR file to the filesystem with the Java JAR utility, just issue the following command: jar xf jar-file-name [files-to-open]Open a JAR Java commandJAR optionMeaningjarThe Java utility to create and open JAR filesx optionIndicates the files in the JAR should be extractedf optionSpecifies the name of the JAR to openjar-file-nameThe name of the JAR to open and extractfiles-to-openOptional command to specify which files in the JAR to open and extract The Java JAR file in reviewThe JAR file is an important artifact in the world of Agile software development in Java. Really, though, the JAR file is just a ZIP file with a different file extension. If you ever need to open a JAR file, any ZIP utility that uses a standard compression algorithm is more than sufficient to perform the task. This Tutorial Explains What is a JAR File and How to Run and Open it in Windows, MAC, Linux using .JAR File Openers: You must have come across JAR files at some point while surfing the Internet and must have wondered about it, about what it is and what it does. Here, in this tutorial, we will tell you everything about .JAR files, what they are, what they do, and how to open them. You can use decompression if you want to view the files in the JAR, and if you want to run it, you will need the Java Runtime Environment. There are also some JAR file opener tools like File Viewer Plus, WinZip, 7-Zip, WinRAR, etc. What You Will Learn:
What Is A JAR FileJAR is the abbreviation for Java Archive files. As the name says, it is an archive file. The archive file is a single file that has other files packed together to decrease storage space, probability of error, and many similar reasons. They are very much like ZIP files, the only difference being that it is used by the Java Runtime Environment. The manifest in JAR files is their unique feature. A manifest is a special metafile that controls the behavior of JAR along with containing the information about the files within the file like compiled Java code, also called CLASS files, security certificates, image files, audio files, etc. Runtime Environment can read and run the JAR file as a single request. It could be a browser add-on, a game, an application theme, and whatnot. It can be used for many purposes on mobile and desktop both. And since it contains thousands of files in a compressed format, you can easily move and share them. How To Open JAR FilesDecompression (View Files) [image source] If you want to view each file in a non-executable jar file, you can do that with the help of a JAR file compatible compression/decompression software. Either WinRAR or 7-ZIP, any one of them is a good choice. After you have installed WinRAR or 7-ZIP, run it, open the file, and extract files in it. [image source] Once you have extracted them, you can click on the files to view them. Although most files are usually a simple text file, you might need additional software to view some. If you want the programs like 7-Zip or WinRAR to be the default programs for opening these files, right-click on the file, go to the ‘Open With’ option and then pick the default program. Click the browse button in the ‘Open With’ window to launch the File Explorer window. Then, find the .exe file for the software program you want as the default program for opening these files. Java Runtime Environment (To Run The file)[image source] If you want to run the JAR file, you will need the Java Runtime Environment. If you have the Java Runtime Environment, then all you need to do is to double click on the file name. But it will only work if that particular file is executable. If not, you can just view the files in it. If the file doesn’t run by double-clicking on it, chances are, it is not an executable file. And if your file is using an archive program like 7-ZIP, or WinRAR but you want to open them with Java, follow these steps:
Programs To Open .JAR Files In Windows#1) File Viewer PlusFile Viewer Plus is a universal file opener compatible with Windows with which you can convert, save, view, and edit files. You can open more than 300 different types of files. You can play many multimedia formats, edit and save images and documents, convert files in batches to many file formats, and inspect the contents of a file with the help of this program. Follow these steps to Open .JAR using File Viewer Plus:
Price: $58.94 Website: File Viewer Plus #2) Corel WinZip 24WinZip is one of the most used file compression utilities for Windows with which you can compress and decompress file archives along with creating backups for data and securely encrypting data. Compressing files saves storage space and can quickly transfer the files over the Internet. Follow these steps to open a JAR file using Corel WinZip 24:
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Website: Corel WinZip 24 #3) 7-Zip7-Zip is an open-source application that is widely used for archiving and compressing data. You can combine many files into an archive or just compress them to reduce the file size for saving storage space or enabling a quick file transfer. Follow these steps to open a .JAR file with 7-Zip:
Price: Free Website: 7-Zip #4) RARLAB WinRARWith RARLAB WinRAR file archiving utility, you can encrypt, compress, package, and back up your files. Although it is only available for Windows, you can also run it on Linux and macOS using Wine or similar compatibility layer applications. Follow these steps to open a .JAR file with WinRAR:
Price: Free Website: RARLAB WinRAR JAR File Openers For Mac#1) Corel WinZip Mac 7Corel WinZip Mac 7 is the OS X version of WinZip that allows you to compress and decompress file archives quickly using the drag-and-drop tools. It supports various compression formats and is used mainly to create .ZIP and .ZIPX archives. You can conveniently back up your files by creating data backup files and save them on a CD or DVD with the help of Zip and CD burning tool. Follow these steps to open a JAR file using Corel WinZip Mac 7:
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Website: Corel WinZip Mac 7 You can also use any web browser for opening the JAR files for Windows, Mac, Linux, and Android along with Oracle Java Runtime Environment. How To Run JAR In Windows 10Follow these steps:
However, if you are still not able to Run JAR on Windows 10, you might need to change the registry a bit.
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How To Open JAR File Without JREJAR is a Java application and every Java application needs either a Java Virtual Machine or Java Runtime Environment. But not everyone has them. So, if JRE isn’t installed in your system, here’s what you can do:
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This way, you will be able to execute the file through the .exe file and batch file. How To Run A JAR File In LinuxIf you have Java installed on your Linux, you will be able to run the JAR file with a double-click or picking option from right-click. You only need Java Runtime Environment and you will be able to easily run the file in Linux. However, sometimes it is not that easy, even with Java installed, you get an error message. [image source] You will get the error something like what is shown in the above image. To fix this error,
Now, with just double-click, the file will run without any problem. However, if you are still not able to run the file, here’s what you can do:
You should be able to run the file successfully now. How To Open Jar Files OnlineThere are many tools available online that you can use to open the JAR files.
The options might vary with the online tool you want to use, so pick accordingly. Suggested reading => How to open XML files online. Errors In Opening JAR Files[image source] It is not rare to see errors when trying to access Java applications. The errors could be due to the security settings in the Windows operating system. You might encounter error messages like blocked Java Application, or an untrusted application is blocked from running by your security settings. But you can fix these issues by fixing the security level in the Java control panel applet. First, make sure Java is enabled in your browser. You can learn how to enable Java in your browser here. Set up the control panel properly for using Java, otherwise, you might not be able to open Java applets even after you have installed JRE. And make sure you restart the browser after enabling Java in your browser. And also ensure that you are running Java’s latest version. Sometimes, when Windows doesn’t know what to do with the JAR file, it tries to open it in a program that doesn’t support the format. In that case, right-click on the file, select open with and choose the app that is suitable for opening the JAR file. To run it directly in the Java Runtime Environment, go to program files and click on the Java folder. Then go to jre1.8.0_211 and open the bin to select java.exe. [image source] If it shows a security error while opening, go to the start menu and type configure Java in the search tab. It will open the Java Control Panel. Navigate to the security tab and check the box beside “enable Java content for browser and web start application”. Change the security level to high and if needed, add to the exception site list. Click on OK. Converting A JAR FileYou can decompile the CLASS files of Java files using the Java decompilers. All you have to do is upload the file and pick the decompiler you want to use. To use the Java application on the Android platform, you will need to convert a Java application and that will need JAR to APK file conversion. You can run the file in an Android emulator so that it automatically creates an APK file. But the easiest way is to get a Java program on Android just by compiling the APK from the original source code. You can use programming applications like Eclipse to make executable JAR files. But you can’t convert a JAR file directly to a Java Web Archive file or WAR file. It is because WAR files have a particular structure that is not present in JAR files. Instead, what you can do is add the file into the lib directory after building a WAR, this will make the components inside the JAR files available for use. You can watch the video here about how to convert the JAR file. It is easy to rename the file extension from .JAR to .ZIP and easier to make a ZIP file from a JAR file. The file doesn’t actually convert but it allows programs like 7-Zip or PeaZip or similar programs to open the JAR file easily. FAQs For Opening A JAR FileQ #1) Why can’t I open my JAR file? Answer: Try updating or reinstalling your Java Runtime Environment and if you still can’t open it, maybe that file isn’t meant to open or tamper with. Q #2) Are JAR files executable? Answer: Not all JAR files are executable. But some often contains a runnable software or source code that can be made executable. Q #3) How is the JAR file different from the executable JAR file? Answer: JAR file is a blend of compiled Java classes while executable JAR files are also the same but with Main class. Q #4) What is a manifest file in a JAR? Answer: MANIFEST is the manifest file in JAR and you can find it under the META-INF directory. It contains a simple list of pairs of keys and values, grouped into sections and are called attributes or headers. ConclusionThis tutorial explains what .JAR file extension is and how to open it. And if you encounter an error while opening the .JAR file, the above-mentioned steps will help you deal with them. There are so many programs that can help you open a JAR file and converting them isn’t too difficult as well. Coral WinZip is the best option for opening the JAR file since it is available for almost all platforms and is easy to use. You can also use WinRAR or 7-Zip if you have them pre-installed on your system. How do I open .jar files?Follow these steps to open a JAR file and extract the contents to the local filesystem:. Change the extension of the JAR file from . jar to . zip.. Right-click on the JAR file and select Extract All.. View the contents of the open JAR file on the file system.. |