private
    val JApiClass.kotlinSourceFilePath: String
        get() = "$packagePath/$bytecodeSourceFilename"

    private
    val JApiClass.bytecodeSourceFilename: String
        get() = newClass.orNull()?.classFile?.getAttribute("SourceFile")?.let { it as? SourceFileAttribute }?.fileName
            ?: throw java.lang.IllegalStateException("Bytecode for $fullyQualifiedName is missing the 'SourceFile' attribute")