newbie question: need help linking

Wed Dec 1 15:49:00 GMT 2004

Prabhakar, Vijay (IT) writes:
 > Hmm, what about a native method that's written as part of a Java class
 > that's compiled with gcj. Can that be called from a .class file?
Yes. You make it into a shared library. See 
Extra features unique to gcj
 * When you compile your classes into a shared library they can be
 automatically loaded by the `libgcj' system classloader. When
 trying to load a class `gnu.pkg.SomeClass' the system classloader
 will first try to load the shared library
 `lib-gnu-pkg-SomeClass.so', if that fails to load the class then
 it will try to load `lib-gnu-pkg.so' and finally when the class is
 still not loaded it will try to load `lib-gnu.so'. Note that all
 `.'s will be transformed into `-'s and that searching for inner
 classes starts with their outermost outer class. If the class
 cannot be found this way the system classloader tries to use the
 `libgcj' bytecode interpreter to load the class from the standard
 classpath. This process can be controlled to some degree via the
 `gnu.gcj.runtime.VMClassLoader.library_control' property; see *Note
 libgcj Runtime Properties::.
 > I was thinking about writing a class for wrapping and unwrapping
 > primitives when communicating between C++ and Java. In other
 > words, I was hoping to have a class converts RawData objects which
 > are actually arrays (or vectors/other STL datastructures) of C++
 > primitives and returns arrays of Java primitives. Would I be
 > better off writing a C++ template that converts C++ primitives into
 > j<primitive> arrays so that it can communicate with the Java code?
I have no idea. Depends on your application.
Andrew.