Dlopen within JNI routine?

Hello,
I have a set of JNI-callable C++ routines in lib1.so,
From within one of these I would like to dlopen() a second
C++ library lib2.so.
dlopen() of this' second library always fails, with dlerror() reporting
'ld.so.1: java: fatal: JNI_OnLoad: can't find symbol'
This second library is purely for local use within a single
JNI-callable routine. Example code below.
How can I make this work please?
Thanks
-- Steve
sun01% java -version
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)
sun01% CC -V
CC: Forte Developer 7 C++ 5.4 2002/03/09
sun01% more Jmaster.java
import java.util.*;
public class Jmaster
static
System.loadLibrary("lib1");
private native void lib1doit();
public static void main(String[] dummy)
Jmaster me = new Jmaster();
me.lib1doit();
sun01% more liblib1.cpp
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <link.h>
#include <errno.h>
#include "Jmaster.h"
JNIEXPORT void JNICALL Java_Jmaster_lib1doit(JNIEnv* env, jobject obj)
char* dlerr;
fprintf(stderr,"Loaded liblib1.so from Java, about to dlopen liblib2.so\n");
// Open lib2
void* mydll = dlopen("liblib2.so",RTLD_NOW);
if ((dlerr=dlerror()) != NULL)
fprintf(stderr,"ERROR! dlopen of liblib2 failed: %s\n",dlerr);
exit(-1);
// Get call to 'lib2doit()'
void(*doit2)() = (void(*)()) dlsym(mydll,"lib2doit");
if ((dlerr=dlerror()) != NULL)
fprintf(stderr,"ERROR! dlsym of lib2doit failed: %s\n",dlerr);
exit(-1);
// Call 'doit2()'
doit2();
// Close lib2
dlclose(mydll);
if ((dlerr=dlerror()) != NULL)
fprintf(stderr,"ERROR! dlclose of liblib2 failed: %s\n",dlerr);
exit(-1);
sun01% more liblib2.cpp
#include <stdio.h>
extern "C" void lib2doit()
fprintf(stderr,"HELLO from lib2\n");
sun01% javac Jmaster.java
sun01% javah -jni Jmaster
sun01% CC -G liblib1.cpp -o liblib1.so -xildoff -library=Cstd -features=no%strictdestrorder -ldl -I/usr/j2sdk1.4.2/include -I/usr/j2sdk1.4.2/include/solaris
sun01% CC -G liblib2.cpp -o liblib2.so -xildoff -library=Cstd -features=no%strictdestrorder
sun01%
sun01% java Jmaster
Loaded liblib1.so from Java, about to dlopen liblib2.so
ERROR! dlopen of liblib2 failed: ld.so.1: java: fatal: JNI_OnLoad: can't find symbol
sun01%

"Johannes Hönig" wrote:
>
Hi
The specification said:
"The enterprise bean must not attempt to load a native library. This funciton is
reserved for the EJB container. Allowing the enterprise bean to load native code
would create a securtiy hole."
Is there a way that the container loads the library. So that I can access it by JNDI
or something simular?
Or do I blind trust the native code that he works fine?The standard approach is to have an RMI server object load the native
library and expose its interface (as a subinterface of Remote,
naturally). Your beans can then call this server via RMI and if they're
in the same container (a given, usually) then you will not incur any RMI
overhead (marshalling, serialization, etc).
Cheers,
Alexander Petrushko
mailto:[email protected]
Consulting Services available
Freemarker vs JSP:
http://javaworld.com/javaworld/jw-01-2001/jw-0119-freemarker.html

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Hello
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