Based upon the documentation for CNI (Interoperating with C/C++) it looks like 
it should be possible to derive my own native CNI class from 
java::lang::Object. However when I compile the enclosed example there is a 
problem with the generated object, it contains no vtable for the class and 
there is an issue with creating the static variable class$. Am I doing 
something wrong or is this feature broken?

The compilation output was obtained by commenting out the derivation of MyClass 
from java::lang::Object.

Compiler output start++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
g++ -v -save-temps -o testit testit.cc -lgcj
Reading specs from /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-
3.3/install2/lib/gcc-lib/i686-pc-linux-gnu/3.3/specs
Configured with: ../configure --enable-java-gc=boehm --enable-fast-character --
prefix=/home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2 : 
(reconfigured) ../configure --enable-threads=posix --enable-java-gc=boehm --
enable-fast-character --prefix=/home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-
3.3/install2 --enable-shared --enable-languages=c++,java
Thread model: posix
gcc version 3.3
 /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/lib/gcc-lib/i686-
pc-linux-gnu/3.3/cc1plus -E -D__GNUG__=3 -quiet -v -D__GNUC__=3 -
D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=0 -D_GNU_SOURCE testit.cc testit.ii
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent 
directory "/home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/i686-
pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/include/c++/3.3
 /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-
3.3/install2/include/c++/3.3/i686-pc-linux-gnu
 /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-
3.3/install2/include/c++/3.3/backward
 /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/include
 /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/lib/gcc-lib/i686-
pc-linux-gnu/3.3/include
 /usr/include
End of search list.
 /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/lib/gcc-lib/i686-
pc-linux-gnu/3.3/cc1plus -fpreprocessed testit.ii -quiet -dumpbase testit.cc -
auxbase testit -version -o testit.s
GNU C++ version 3.3 (i686-pc-linux-gnu)
        compiled by GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-98).
GGC heuristics: --param ggc-min-expand=98 --param ggc-min-heapsize=128433
 as --traditional-format -V -Qy -o testit.o testit.s
GNU assembler version 2.11.90.0.8 (i386-redhat-linux) using BFD version 
2.11.90.0.8
 /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/lib/gcc-lib/i686-
pc-linux-gnu/3.3/collect2 -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o 
testit /usr/lib/crt1.o /usr/lib/crti.o /home/scratch_scarp/shanes/xaud_work/C++/
GCC/gcc-3.3/install2/lib/gcc-lib/i686-pc-linux-gnu/3.3/crtbegin.o -
L/home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/lib/gcc-lib/i686-
pc-linux-gnu/3.3 -L/home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-
3.3/install2/lib/gcc-lib/i686-pc-linux-gnu/3.3/../../.. testit.o -lgcj -
lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -
lgcc /home/scratch_scarp/shanes/xaud_work/C++/GCC/gcc-3.3/install2/lib/gcc-
lib/i686-pc-linux-gnu/3.3/crtend.o /usr/lib/crtn.o
Compiler output end++++++++++++++++++++++++++++++++++++++++++++++++++++

Test Code start---------------------------------------------------------
#include <iostream>
#include <string>
#include <stdio.h>
#include <gcj/cni.h>
#include <java/lang/Object.h>
#include <java/lang/System.h>

using namespace std;

class ::MyClass //: public java::lang::Object // <--Uncomment to see problem!
{
public:
  gnu::gcj::RawData * string;

  MyClass ();
  gnu::gcj::RawData * getText ();
  void printText ();
};

::MyClass::MyClass()
{
  char* text = "44444";
  string = (gnu::gcj::RawData * )text;
}

gnu::gcj::RawData *
::MyClass::getText ()
{
  return string;
}

void
::MyClass::printText ()
{
  printf("%s\n", (char*) string);
}

void
PassTest(java::lang::String * text)
{
  string stext((char *)JvGetStringChars(text),2*JvGetStringUTFLength(text));
  cerr << "'" << stext << "'" << endl;
}

int
main(int argc,
    char *argv[])
{
  JvCreateJavaVM(NULL);
  JvAttachCurrentThread(NULL, NULL);
  JvInitClass(&java::lang::System::class$);

  java::lang::String * string = JvNewStringLatin1("trace");
  PassTest(string);
  MyClass * abc = new MyClass;
  abc->printText();
  return 0;
}
Test code end------------------------------------------------------------