change javahome cmd
setx JAVA_HOME -m "Path"
update java windows
Depends on what kind of window it is, also what methods you are using for rendering
If you are using the Swing/AWT, most likley you have to "repaint()" the panel
If you are using bufferStrategy you have to "show()" the bufferStrategy.
It really depends on what kind of "window" you are making.
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