There’s a principle called “eating your own dogfood”. By using a tool, you demonstrate the usefulness of the tool. It is often asked, “if the compiler for language X isn’t written in language X, why should I risk using it?” This of course only applies to languages suitable for the domain of compiler writing.
As the GDB said: This generally means that another instance of this process was already running or is hung in the debugger So find out it and kill it. 😉 I restarted the mac, and it run successfully. Tip: Well, this may be not work sometimes, so I strongly suggest that you press cmd+. to … Read more
“Bootstrapping” comes from the term “pulling yourself up by your own bootstraps.” That much you can get from Wikipedia. In computing, a bootstrap loader is the first piece of code that runs when a machine starts, and is responsible for loading the rest of the operating system. In modern computers it’s stored in ROM, but … Read more
Yes it is deprecated. Replace your SessionFactory with the following: In Hibernate 4.0, 4.1, 4.2 private static SessionFactory sessionFactory; private static ServiceRegistry serviceRegistry; public static SessionFactory createSessionFactory() { Configuration configuration = new Configuration(); configuration.configure(); ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings( configuration.getProperties()). buildServiceRegistry(); sessionFactory = configuration.buildSessionFactory(serviceRegistry); return sessionFactory; } UPDATE: In Hibernate 4.3 ServiceRegistryBuilder is deprecated. Use … Read more
Is there a way to actually write a compiler in its own language? You have to have some existing language to write your new compiler in. If you were writing a new, say, C++ compiler, you would just write it in C++ and compile it with an existing compiler first. On the other hand, if … Read more
This is called “bootstrapping”. You must first build a compiler (or interpreter) for your language in some other language (usually Java or C). Once that is done, you can write a new version of the compiler in language Foo. You use the first bootstrap compiler to compile the compiler, and then use this compiled compiler … Read more