Adding files to java classpath at runtime [duplicate]

You can only add folders or jar files to a class loader. So if you have a single class file, you need to put it into the appropriate folder structure first. Here is a rather ugly hack that adds to the SystemClassLoader at runtime: import java.io.IOException; import java.io.File; import java.net.URLClassLoader; import java.net.URL; import java.lang.reflect.Method; public … Read more

What is run time environment?

Distinguish this from Development Environments and Build Environments. You will tend to find a hierarchy here. Run time environment – Everything you need to execute a program, but no tools to change it. Build environment- Given some code written by someone, everything you need to compile it or otherwise prepare an executable that you put … Read more

How to load a jar file at runtime [duplicate]

Reloading existing classes with existing data is likely to break things. You can load new code into new class loaders relatively easily: ClassLoader loader = URLClassLoader.newInstance( new URL[] { yourURL }, getClass().getClassLoader() ); Class<?> clazz = Class.forName(“mypackage.MyClass”, true, loader); Class<? extends Runnable> runClass = clazz.asSubclass(Runnable.class); // Avoid Class.newInstance, for it is evil. Constructor<? extends Runnable> … Read more

Adding Java Annotations at Runtime

It’s possible via bytecode instrumentation library such as Javassist. In particular, take a look at AnnotationsAttribute class for an example on how to create / set annotations and tutorial section on bytecode API for general guidelines on how to manipulate class files. This is anything but simple and straightforward, though – I would NOT recommend … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)