How to download jar files java

You can simply install these updates by using File renameTo. The next problem you will have is installing the updates. The problem you might have is with locked files. If any Java process is using the Jar's, you won't be able to update them Now, this requires some clever juggling to make work, depending on your situation. Generally, you want to make the updater a separate program that does not rely on any of the application jars.

This prevents the updater from locking the files it is trying to update. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 8 years, 2 months ago. Active 3 months ago. Viewed 11k times. Improve this question. You might want to check this out: stackoverflow. Add a comment. Active Oldest Votes. Download the file using httpclient library in a specific folder. Here is an example. Copy the downloaded file replacing the earlier file.

Improve this answer. Community Bot 1 1 1 silver badge. Santosh Santosh The question is vague, but if you don't mind getting your hands dirty However, some applications are dedicated to modifying other types, and file formats are abundant, even for a single type of file.

The one in question here is JAR, which can easily get associated with another type of program, thus making it impossible for users to launch JAR applications by just double-clicking these files. Luckily, Jarfix comes to save the day. JAR files are nothing more than special executable files created by Java , which come bundled with a variety of classes and functions to make the dedicated program work.

Also, Java Runtime Environment must be installed on the computer in order to run Java apps. The problem is that some archiving utilities assume that you use JAR files to compress files into archives and, after installing these archiving utilities, they get automatically associated with JAR files, thus overwriting Java.

In such cases, it becomes difficult for users to open JAR files with Java, unless they know how to fiddle with the Windows settings to manually change the filetype association. Users might even think that the JAR program in question is not functional just because it seemingly cannot be opened with Java.

As mentioned above, you can rely on Jarfix to solve this issue. As such, you can also carry it around on an USB flash drive to restore the JAR filetype association on other computers that deal with this issue.

However, you must have administrative permissions. A small prompt appears to inform you that the operation is successful, also pointing out the location of the Java Runtime Environment program on your computer. In case the problem persists, you can run Jarfix again.