The Internal Exception Java.IO.IOException error usually occurs when you launch Minecraft, or when the game is underway. This error can be caused by a number of different things.

Test your knowledge of exception handling in Java with this tough, 10-question, multiple choice quiz.

Runtime errors can occur without warning and be difficult to resolve. Here are the five most common runtime errors in Java and advice on how to avoid them.

Java exception handling with stack traces, exception chaining, try-with-resources, final re-throw, and StackWalker.

Minecraft Internal Exception errors can be frustrating to get rid of if you do not know what to do.