Methods related to accessing constantpool entry by offset:
readEntry(int offset)
readEntry(int offset, Class<T> cls)
readEntryOrNull(int offset)
readMethodHandleEntry(int offset)
readModuleEntry(int offset)
readNameAndTypeEntry(int offset)
readPackageEntry(int offset)
readUtf8Entry(int offset)
readUtf8EntryOrNull(int offset)

Expectation of the API is to provide offset within the classfile which is the index of the pool entry to be read. But the classfile doesn't contain indices. Hence the APIs are unusable