Mainly, this error occurs when the user type java -jar filename instead of java -jar filename.jar in the command prompt. Here JAR is missing, which is the leading cause of this error, preventing the JAR file from running. However, if you are directly trying to open the JAR file, skip the first two methods, as they are for the users who are facing this error on the command prompt. Before you move on to the methods, download the latest version of the Java archive utility, as it is required to run the JAR files.
1. Check the path and name of a JAR file
Before applying the in-depth methods, you first need to ensure that your JAR file location contains a correct path with the extension name. If you have unnecessary spaces in the path or forget to mention the extension name of a JAR file, this error will occur. To keep this simple, copy the JAR file and paste it with the bat or batch file, which will run the jar file. This will help you to avoid writing a long path in the command.
2. Run the bat file as an administrator
Unable to access the JAR file can be caused by not having appropriate permissions to run the jar file. Since Windows is showing this error, it means there can be a lack of permissions to your user account, preventing you from running the JAR file. You can try running as an administrator to avoid permission issues.
3. Download the compatible Java version for a JAR File
It is important to figure out what java version is used to compile the JAR file you are trying to run. If the JAR file has compiled in java 7 and you are trying to open it with java 15, this error will occur. Therefore, it is essential to install the compatible java version to run the JAR file. You can try installing the multiple JAVA archive utility to determine which JAVA version is used to compile your JAR file.
4. Give appropriate permissions to the parent JAR file folder
Every folder has security settings that allow users to manage the permissions of the folder. When you create a new folder, the user has all the permissions required to access the files. However, if you don’t have permission to write the data under the parent folder, it will result in this error message. Therefore, try changing the permissions settings to see whether the error persists or not. To give the permissions, follow the steps:
5. Run the JAR file with Java (TM)
Since Java (TM) Platform SE Binary is required to unzip the JAR files, it is possible that you are trying to run it with other programs, which is why you are encountering this error. Hence, try running it with Java (TM) Platform SE Binary which is included in Java. Hence, it is important to download the Java archive utility from the website before executing the following steps: To run the JAR file:
