If you've got a jar that just won't open because the seal is too tight or something is stuck in the lid, try one of these easy tips.

JEP 238: Multi-Release JAR Files extends the JAR file format to allow multiple, Java-release-specific versions of class/resource files to coexist in the same archive. This upgrade makes it easier ...

How to install Java on your computer To run Java apps, open JAR files or compile some source code into bytecode you’ll need to install Java. To download and install Java on Windows, MacOS or Ubuntu, ...

We've all been there. The jar lid won't budge and no one else is around. Martha Stewart has a super simple hack for how to open a jar.