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I assume that the Java wrapper has the same functionality as the native code.
Given that and according to Java API documentation you can only set the width and height properties of the capture. Description of get states that
When querying a property that is not supported by the backend used by the "VideoCapture" class, value 0 is returned.
The same sentence can be found at the C++ documentation of get.
From the above I think that you cannot set the exposure.
