An image forming apparatus comprises: a photosensitive member; a plurality of development devices attachable to and detachable from a main body of the image forming apparatus, a motor; and a drive transmission member. During execution of the code, a determination is made as to whether an access indicator is associated with an instruction in response to executing the instruction in the code by a processor in the data processing system. Each of the at least one optimizer includes logic for recognizing a pattern in a received Java byte code, logic for optimizing the recognized pattern to produce optimized native code and logic for outputting optimized native code. The positive electrode contains a positive electrode material in which a coating portion is provided on the surface of a center portion made of a lithium composite oxide such as LiMn2O4. In particular, a method for the electroenzymatic preparation of 2,3-dihydroxyphenyl derivatives, which is catalyzed by the enzyme 2-hydroxybiphenyl 3-monooxygenase and in which simultaneously the NAD formed by reductive cleavage of oxygen is electrochemically reduced, is described. The side portion of the fixing member includes at least two coupling areas and a support area extending from the coupling areas, wherein, a coupling opening is formed in the coupling areas, and the distance from one end of the coupling opening to the boundary of the bottom portion close to the other end of the coupling opening is smaller than the width of the support area.