reflection - java: unchecked call to getConstructor(java.lang.Class<?>...)

Question

I am using reflection to construct a class (ConfigBuilder) that takes a File as argument:

Class myClassType = Class.forName(className);
Class[] types = new Class[] { File.class };
Constructor cons = myClassType.getConstructor(types);
Object[] constructorArgs = new Object[] { myFile };
cb = (ConfigBuilder) cons.newInstance(constructorArgs);

but I get this warning:

warning: [unchecked] unchecked call to getConstructor(java.lang.Class<?>...) as a member of the raw type java.lang.Class
Constructor cons = myClassType.getConstructor(types);

Obviously, it seems that getConstructor expects a generic type so I tried something like:

Class<?>[] types = new Class<?>[] { File.class };

but I get the same warning message

Any idea ?

David

Answer 1

The warning actually refers to myClassType. You need to parameterize it (and the cons) as well.

Class<?> myClassType = Class.forName(className);
Class<?>[] types = new Class[] { File.class };
Constructor<?> cons = myClassType.getConstructor(types);