Is Java installed? To run the Java command, first you must have Java installed. This means either the Java Runtime Environment (JRE) or the full Java Development Kit (JDK).

The error Unable to update the Minecraft Runtime Environment usually occurs when the installation location of Minecraft and Java differs. Here's the fix.

Gowdiak said the flaw affects Java SE 7 and that it is present in not just the browser runtime environment and development kit software, but also in the Server JRE by using flaw in the Java ...