Linking .jar.so

Thu Jul 10 22:15:00 GMT 2008

Hi all,
I'm trying to convert .jar to .so and then linking it with a .cpp program.
Here are the steps I did. I fail to link .o and .so ! May be you have 
an idea to solve this problem ?
Thanks,
Benjamin
 >> ERROR
$ gcj -o essai3.bin essai3.o -L . -lgcj -lstdc++ ant.jar.so 
ant-launcher.jar.so
test.o: In function `main':
test.cpp:22: undefined reference to `void 
org::apache::tools::ant::Main::main(JArray<java::lang::String*>*)'
collect2: ld returned 1 exit status
 >> STEPS
$ gcj -shared -findirect-dispatch -fjni -fPIC -Wl,-Bsymbolic 
/opt/ant/lib/ant.jar -o ant.jar.so
$ gcj -shared -findirect-dispatch -fjni -fPIC -Wl,-Bsymbolic 
/opt/ant/lib/ant-launcher.jar -o ant-launcher.jar.so
$ gcjh -v -cni -classpath 
/opt/ant/lib/ant.jar:/opt/ant/lib/ant-launcher.jar:/usr/lib/jvm/java-6-sun/jre/lib/rt.jar 
org.apache.tools.ant.Main
$ g++ -c -g -O -I. test.cpp
$ gcj -o essai3.bin essai3.o -L . -lgcj -lstdc++ ant.jar.so 
ant-launcher.jar.so
 >> Program : test.cpp
#include <gcj/cni.h>
#include <java/lang/System.h>
#include <java/io/PrintStream.h>
#include <java/lang/Throwable.h>
#include <org/apache/tools/ant/Main.h>
int main(int argc, char *argv[])
{
 using namespace java::lang;
 try
 {
 JvCreateJavaVM(NULL);
 JvAttachCurrentThread(NULL, NULL);
 String *message = JvNewStringLatin1("Hello from C++");
 JvInitClass(&System::class$);
 System::out->println(message);
 
 org::apache::tools::ant::Main::main(NULL);
 
 JvDetachCurrentThread();
 }
 catch (Throwable *t)
 {
 System::err->println(JvNewStringLatin1("Unhandled Java 
exception:"));
 t->printStackTrace();
 }
}