Constant pool entries are reused for different kinds of constants

Names of class members in Java class files as indexes into the file's constant pool. Changing (using something like BCEL) the value of the UTF8 constant used by a member's name renames the member. However, that constant might also be used for something that's not a reference to that member, like a string literal in code or a reference to a different class's member of the same name, so that rename strategy could break things. Instead, new UTF8 and name-and-type constants should be added and the member reference constants should be adjusted to refer to those. Alternatively, a higher-level library like ASM may be more convenient.