java - Opengl multiple glDrawArrays calls -

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i have problem vertex array objects in opengl (java, lwjgl). program works, have object, can move around it. draw call simple: 

gl11.gldrawarrays(drawmode, 0, 4);

in shader have 1 uniform model, (called model ^^). tried following: (pseudo code) 

update model   draw   update model   draw again

this doesn't work. why? know there instancing, isn't aim here. want draw 2 things 2 draw calls. see first one.. have idea?

** edit **

i hate it. hate principe... again , again forget flip buffer before using in opengl. again. point... first time flipped second time not... can't brain flip buffers -.-


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