Compiling C++ classes on Linux

Question

Thanks in advance for your help!
I'm trying to compile a C++ class (that calls another class) with JNI. It compiles but the functions don't seem to be in the .o file.
The HelloWorld example runs fine.
Any ideas?

Answer 1

Did have a long, detailed message, but it didn't post, for some reason.
There's a class written in C++ which I want to use, Token. I have a wrapper Java class, Tokenizer. The Tokenizer C++ class I defined holds a Token object, as a data member.
When running java, the .so is found, but the method isn't, what I get is:
UnsatisfiedLinkError: getType
so I checked the shared library file, and the method doesn't show in it:
nm -s libtoken.so
... <methods from Token, not Tokenizer>
I tried also:
nm -s tokenizer.o
00000000 t gcc2_compiled.
When running
nm -s token.o, I get the full list of methods.
I just noticed, the C++ class and ata members are defined in the .h file. Am I supposed to define the class and data members in the generated .h file?
Here is the compilation process:
g++ -c -I/usr/local/java/jdk1.3/include -I/usr/local/java/jdk1.3/include/linux token.cc
g++ -c -I/usr/local/java/jdk1.3/include
-I/usr/local/java/jdk1.3/include/linux tokenizer.cc
ld -shared -o libtoken.so token.o tokenizer.o
java -Djava.library.path=.:/usr/local/java/jdk1.3/lib/i386/:/usr/local/lib ex3 symboltableitem.cmm
Exception in thread "main" java.lang.UnsatisfiedLinkError: getType
at Tokenizer.getType(Native Method)
at Parser.declaration(Parser.java:69)
at Parser.declaration(Parser.java:42)
at ex3.main(ex3.java:33)
Tried also compiling this way, and then Java doesn't find 'main':
g++ -I/usr/local/java/jdk1.3/include -I/usr/local/java/jdk1.3/include/linux token.cc tokenizer.cc -Xlinker -G -o libtoken.so
java -Djava.library.path=.:/usr/local/java/jdk1.3/lib/i386/:/usr/local/lib ex3 symboltableitem.cmm
Exception in thread "main" java.lang.UnsatisfiedLinkError: /a/fs-01/grad/amigo/Compilers/Ex3/libtoken.so: /a/fs-01/grad/amigo/Compilers/Ex3/libtoken.so: undefin
ed symbol: main
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1382)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1306)
at java.lang.Runtime.loadLibrary0(Runtime.java:749)
at java.lang.System.loadLibrary(System.java:820)
at ex3.main(ex3.java:22)
I'm just about to give up and re-write the class in Java. But that's not what JNI is supposed to do :)
Thanks,
ami