System.loadLibrary Hangs

I have a .dll used for address verification and I wrote a JNI wrapper .dll in C++ so I could use it with my application. I wrote a class with both a main method and constructor method and the class works fine at the command prompt. When I try to use the class with my application it hangs at the System.loadLibrary command. I'm using JRun 4 on a Win 2k server. I set the java.library.path to the location of the .dll and made sure all necessary files were in that folder. Any helpful suggestions would be appreciated. Thanks.

A hang at that point in time means it has nothing to do with java.
The dll probably has a dllmain method (or whatever it is called.) That method is being called and is never returning. You need to figure out why.

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System.loadLibrary(weblogicoci37) threw java.lang.UnsatisfiedLinkError:

Hello,
I have a problem about jDriver
the configuration is:
solaris 8
WLS 6.1 sp2
Oracle9i 9.0.1
jDriver oci 901_8
(Weblogic server and Oracle db in same machine)
I follow the "Installing WebLogic jDriver for Oracle" setting from BEA online
documantation.
but I got some error and exception as follow:
Could not create pool connection. The DBMS driver exception was:
java.sql.SQLException: System.loadLibrary(weblogicoci37) threw java.lang.UnsatisfiedLinkError:
/export/home/bea/wlserver6.1/lib/solaris/oci901_8/libweblogicoci37.so: ld.so.1:
/export/home/bea/jdk131/jre/bin/../bin/sparc/native_threads/java: ?P?R??: /usr/local/oracle/OraHome1/lib/libclntsh.so.9.0:
???~?? ELF ??§O?G ELFCLASS64
at weblogic.jdbc.oci.Driver.loadLibraryIfNeeded(Driver.java:226)
at weblogic.jdbc.oci.Driver.connect(Driver.java:76)
somebody can give me a hang,thanks!!!
-Winson

You need to have /export/home/bea/wlserver6.1/lib/solaris/oci901_8 in your LD_LIBRARY_PATH env variable so that the library
can be found and loaded dynamically. Check the startWebLogic.sh script for an example and make sure that it is getting set
appropriately when you start the server.
Bill
Winson Lee wrote:
Hello,
I have a problem about jDriver
the configuration is:
solaris 8
WLS 6.1 sp2
Oracle9i 9.0.1
jDriver oci 901_8
(Weblogic server and Oracle db in same machine)
I follow the "Installing WebLogic jDriver for Oracle" setting from BEA online
documantation.
but I got some error and exception as follow:
Could not create pool connection. The DBMS driver exception was:
java.sql.SQLException: System.loadLibrary(weblogicoci37) threw java.lang.UnsatisfiedLinkError:
/export/home/bea/wlserver6.1/lib/solaris/oci901_8/libweblogicoci37.so: ld.so.1:
/export/home/bea/jdk131/jre/bin/../bin/sparc/native_threads/java: ?P?R??: /usr/local/oracle/OraHome1/lib/libclntsh.so.9.0:
???~?? ELF ??§O?G ELFCLASS64
at weblogic.jdbc.oci.Driver.loadLibraryIfNeeded(Driver.java:226)
at weblogic.jdbc.oci.Driver.connect(Driver.java:76)
somebody can give me a hang,thanks!!!
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USB modem and Internet Sharing causes system to hang.

First my setup. I have a Mac mini (early 2009) running 10.7.2 connected to the Internet using a Sony Ericsson W910 as a USB modem. I am using Internet sharing via Ethernet to a 1st generation (n) AirPort Extreme to give Wi-Fi to other devices (iPhone, Xbox 360, PS3 etc).
Now the problem: When Internet Sharing is on regardless of what interfaces are used (Ethernet, Wi-Fi, Bluetooth PAN etc) eventually—that word is key—my system will hang. Internet will be unavailable to every device and my Mac itself (but they will still be connected to Wi-Fi) and any app that is running willbeachball. Any app I launch—or try to—will also beachball. I've tried leaving it to see if it will resolve itself —even overnight—but it always requires a hard reset.
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It's definitely Internet Sharing which is causing this because when I turn it off I don't have any problems. I've tried every configuration. Only sharing via my mini's Wi-Fi or Ethernet, leaving the AirPort out etc. As soon as I turn on Internet Sharing I've started a countdown to a hang.
On inspecting the Console the last messages before a hang without fail are always:
12/12/2011 06:31:07.000 kernel: 80 80 AppleUSBCDCECMData: getOutputBuffer - Output buffer pool empty
12/12/2011 06:31:07.000 kernel: 80 66 AppleUSBCDCECMData: USBTransmitPacket - Output buffer unavailable
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Repeated hundreds of times. Quick Googling indicates that AppleUSBCDCECMData is a USB driver. Apparently I have version 4.1.15 which appears to be the latest.
I'm aware this is a rare configuration but I believe it affects every USB not just this particular phone.
Is anybody else experiencing this or knows a way to fix it?
Thanks.

Thanks Barry.
The hub is on its way to the manufacturer for after sales service...
But the issue with AirPort remains the same, even after resetting SMC.
Some clarification:
* It happens just after computer wakes up from sleep. Restarting solves the problem and the issue doesn't arise until computer goes standby again.
* The whole WiFi card becomes unresponsive. It is not only the Turn Off button, but the whole functionality is stopped. The card can not be activated/deactivated and it doesn't connect to any network. If it is used for internet sharing, clients are unable to connect.

How to Load 2 library files using System.loadLibrary in one .java file!!!

Hello,
Someone please help me. What I am trying to do is load two .DLL files in my program. Program works fine when I
do the following way i.e. I have two .java files and in each I am loading one .DLL file. But I don't want to have
two .java files I want to load both the .DLL files in one program.
**************** Example.java **********
import java.io.*;
import java.util.*;
public class Example
public native int A(String in);
static
System.loadLibrary( "API2" );
public static void main( String args[])
     Ex ex = new Ex();
     int r;
     r = ex.A("TEST");
public Example()
*****************Ex.java*****************
public class exsysml
public native int A(String in);
public exsysml()
System.loadLibrary("API3");
The above way works. But I need only one .java file to load both the .DLL files. i.e.
import java.io.*;
import java.util.*;
public class Example
public native int A(String in);
static
System.loadLibrary( "API2" );
System.loadLibrary( "API3" );
public static void main( String args[])
     Example ex = new Example();
     int r;
     r = ex.A("TEST");
public Example()
but when I do this way it doesn't work and I get a UnSatisfiedLinkage Error at ex.A("TEST"). While doing the top way it works.
How can I fix this to just have one .java file and load both the library files as done in the bottom program but doing this program doesn't work. Any help is appreciated.
Thanks!

what I figured out so far is that we can only load one library file in a single class and define all the native methods present in that library in the class where we are loading it. Means we can't load multiple library files in a single class. It's just my thought else if someone provides a better solution. I may be wrong so that's why I need your help.
Thanks

Right-click, drop-down menus in Firefox 15 cause entire Mac OS 10.7.4 system to hang, forcing manual reboot.

I bought a new MacBook Pro.
I am running Mac OS 10.7.4 with Firefox 15. Every time I right click or try to use a drop-down menu in Firefox, it causes the entire system to hang, forcing a manual reboot.
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I have tried
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2.) Disabling all the add-ons
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4.) Removing and re-installing Firefox
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Unable to create a Purcahse order from Proman-System is hanging

Hi All,
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Regards,
N.Raju

Hi Nitin,
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System.LoadLibrary + dlopen -- callback causes unresolved symbol

Hi guys,
I am currently trying to use the API
System.loadLibrary(String name)in order to dynamically link shared libaries to SOLARIS JVM.
I am facing some unresolved symbol at run-time .
I load a shared library libhello1 (using system.LoadLibary)
and I call from this lib (via JNI interface) a method which
loads a second library libhello2(using dlopen) and invokes hello2().
hello2 will call back a method hello_bug which is implemented in libhello1.
There is the a mutual or cyclic dependence. This dependance is correctly handled if I link the libhello1 to a standard C implemented executable.
But if I load libHello1 via System.Load, the second lib is correctly loaded but the call back is not possible due to unresolved symbol.
It seems like the symbols are not kept in this case(or the dlopen creates a different thread?...)
The workaround to fix the issue is to link explicitely libHello1 to libHello2 when building libHello2.
I don't know if this is clear to everyone so
I have reproduced this on a very simple case.
Basicaly, I have implemented in standard C language 2 shared libraries:
libHelloModule1.so, libHelloModule2.so
one standard executable and one java interface to call the method
Below is the full code for reproduce:
hello1.h:
#include <dlfcn.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <jni.h>
#include "hello_jni.h" [u]//automatically generated by javah -- ref Makefile[/u]
extern "C" void hello_bug();
hello1.cc :#include "hello1.h"
extern "C" {
JNIEXPORT void JNICALL Java_com_helloworld_Hello_ShowMessage
(JNIEnv *, jobject, jstring){
void *handle;
const char *error;
void (*init) (void);
printf(" load Hello2 \n");
handle = dlopen ("libHelloModule2.so", RTLD_LAZY);
printf (" lib Hello2 onload.. \n");
error = dlerror();
if (!handle) {
      printf ("lib HelloModule2 not loaded correctly %s \n", error);
      exit(1);
   dlerror();
   init =(void(*)()) dlsym(handle, "hello2");
error = dlerror();
        if(error)
                fprintf(stderr, "Could not find print_hello(): %s\n",
error);
                exit(1);
(*init)();
    dlclose(handle);
void hello_bug()
printf ("Hello bug correctly invoked : CQFD\n");
}// extern "C"
hello2.cc
#include "hello1.h"
typedef void ( *PF1) (char *, char *);
extern "C" {
void hello2(){
printf ("Hello2 : ping Hello1\n");
/*simple call work in c not via JNI*/
hello_bug();
Hello.java :
package com.helloworld;
import java.util.*;
import java.io.*;
public class Hello {
private native void ShowMessage(String msg);
public void initialized() {
            System.out.println(" ShowMessage - called");
try {
          ShowMessage("Generated with JNI");
       } catch (Exception e ) {
            e.printStackTrace();         }
public Hello(){
System.loadLibrary("HelloModule1");
            System.out.println(" HelloModule1 loaded");
TestLocal.java :
import java.util.*;
import java.io.*;
import com.helloworld.Hello;
public class TestLocal{
public TestLocal(){
        System.out.println("test local");
public static void main(String[] args) {
        TestLocal test_local = new TestLocal();
        Hello test = new Hello();
        test.initialized();
}THE MOST IMPORTANT IS IN THE MAKEFILE:
Makefile :all: Hello.jar hello_jni.h libHelloModule1.so libHelloModule2.so TestLocal.class dummy
Hello.jar: com/helloworld/Hello.class
jar cvf $@ com/helloworld
com/helloworld/Hello.class: Hello.java
$(JAVAC) -d . Hello.java
hello_jni.h: Hello.jar
$(JAVAH) -jni -o $@ -classpath ./Hello.jar com.helloworld.Hello
libHelloModule1.so : hello_jni.h hello1.o
gcc -G -o $@ hello1.o -lstdc++
libHelloModule2.so : hello2.o
gcc   -G -o $@ hello2.o -Wl -lstdc++ -L. -lHelloModule1   [u] # -->CASE 1 :THIS WORKS [/u]
gcc   -G -o $@ hello2.o -Wl -lstdc++ [u] #-->CASE 2 :THIS DOES NOT WORK[/u]
dummy : dummy_main.o
gcc -o $@ dummy_main.o -L. -lHelloModule1 -L/usr/local/lib -lstdc++
hello2.o : hello2.cc
gcc -I. -O -c hello2.cc
hello1.o : hello1.cc
gcc -I. -O -c hello1.cc
TestLocal.class : TestLocal.java
$(JAVAC) -classpath . -d . TestLocal.java
dummy_main.o : dummy_main.cc
gcc -I. -O -c dummy_main.cc
clean:
rm -rf com *.o *.so *.class *.jar hello_jni.h dummyCASE 1 : libHelloModule1.so is explicitely linked to libHelloModule2
myhost % dummy
load Hello2
lib Hello2 onload..
Hello2 : ping Hello1
Hello bug correctly invoked : CQFD
myhost % java -cp . TestLocal
test local
HelloModule1 loaded
ShowMessage - called
load Hello2
lib Hello2 onload..
Hello2 : ping Hello1
Hello bug correctly invoked : CQFD
CASE 2 : libHelloModule1.so is not explicitely linked to libHelloModule2
myhost % dummy
load Hello2
lib Hello2 onload..
Hello2 : ping Hello1
Hello bug correctly invoked : CQFD
myhost % java -cp . TestLocal
test local
HelloModule1 loaded
ShowMessage - called
load Hello2
lib Hello2 onload..
lib HelloModule2 not loaded correctly ld.so.1: java: fatal: relocation error: file ./libHelloModule2.so: symbol hello_bug: referenced symbol not found
My concern is to have this working in CASE1 with the JNI interface the same way it does in standard C built runtime.
So does any have encountered this?
Is there something I missed somewhere?
Thanks lot for your help
Youss

Hi,
I have implemented JNative which seems to be close to your problem.
It works under Windows and Linux, and loads libraries via dlopen and dlsym.
You can have a look at it's implementation at http://jnative.cvs.sourceforge.net/jnative/JNativeCpp/
Don't forget to load your libraries before trying to call them with System.load("/path/to/your/lib.so"); if they are not referenced by LD_LIBRARY_PATH.
This post may be false since I know nothing about Solaris. Perhaps JNative may be ported under Solaris ?
--Marc (http://jnative.sf.net)

System.loadLibrary works in 1.3.1 but not in 1.2.2

I Have a basic hello world application on Sun Solaris 7 that calls C++ from Java using JNI.
The code works well on 1.3.1, but when I recompile it under 1.2.2 and run I get the following exception when I call System.loadLibrary to load my shared library:
java.lang.UnsatisfiedLinkError: no MyLib in java.library.path
My LD_LIBRARY_PATH is set correctly since it worked under 1.3.1.
Just in case, I used the following code to get and set the java.library.path to no avail.
// Check System properties
String strLibPath = System.getProperty("java.library.path");
System.out.println("The Lib Path before set == " + strLibPath);
StringBuffer strLibPathBuffer = new StringBuffer("/u/kbonacc/mypath:");
strLibPathBuffer.append(strLibPath);
System.setProperty("java.library.path", strLibPathBuffer.toString());
strLibPath = System.getProperty("java.library.path");
System.out.println("The Lib Path after set == " + strLibPath);
Are there any differences between 1.3.1 and 1.2.2 in this respect?
Thanks,
-- Ken

In the bug parade I've heard excuses from Sun programmers that this is a read-only property and isn't supposed to be changed. It probably took them longer to write the reply to the bug than it would have to fix the code.
I looked at the source code for the ClassLoader and for the source release of the JDK 1.3.1 and here's the code I found in the ClassLoader.loadLibrary() method:
        if (sys_paths == null) {
                usr_paths = initializePath("java.library.path");
                sys_paths = initializePath("sun.boot.library.path");
        }It seems it parses and caches the system and user library paths on startup and then never bothers to check them to see if they've changed ever again. I think it would be pretty simple to rewrite that code block by moving one line of code down two lines as this:
        if (sys_paths == null) {
                sys_paths = initializePath("sun.boot.library.path");
        usr_paths = initializePath("java.library.path");I mean, it's not as if loadLibrary is really performance intensive or even critical enough to bother caching at all!
This one code change could fix a lot of headaches.
The particular headache I'm working on is that there doesn't seem to be any support in the Servlet 2.2 or 2.3 specification for JNI files. I'd really love to be able to use a directory like WEB-INF\jni to store libraries that need to be distributed with my web application. I tried to dynamically change java.library.path to include WEB-INF\jni, but alas I ran into the same problem you did, it doesn't work.
Is is possible for this to be fixed, ever? I think it would take longer to say no and make up a reason why not then it would to actually make the fix... seems a good enough arguement to do it to me.
And alternately, can we come up with a standard place to put JNI stuff for web applications in the next Servlet standards?
Thanks in advance!
-J.C.
[email protected]

System freezes(Hangs) if I use Print Button

Hello,
I created few dashboards using SAP xMII.Once I logon to the application, if I press Print button to take the print of the Dashboard screen, System Freezes(Hangs).
Than I have to use Task Manager and kill SAP xMII session thread to close the application.
Did any body came across similar kind of experience or knows about the problem?
Help will be highly appreciated.
Regards
Raman

Raman
R using window.print() function for this or wat?
One important thing to remember
<b>A printer friendly page is really just a page with text, no images, graphics, navigation or advertising.
</b>
Regards
Som

HT1338 My system preference hang after i click desktop and screen saver app.

When ever i try to change my wall paper or click on my desktop and screen saver app the system preference hang..
Any one know how to fix that beside format the whole system?
Thanks in Adv.

Welcome to the Apple Support Communities
Try to delete the Desktop settings file. First, open Finder, select Go menu > Go to Folder, and type ~/Library/Preferences. Then, delete "com.apple.desktop.plist" and "com.apple.systempreferences.plist", and restart. Finally, you should be able to go to Desktop and Screen Saver on System Preferences

System Preferences Hanging

I upgraded my First Gen Macbook to Snow Leopard when it came out. Just recently however, I have started having a problem with system preferences. The first time I open system preferences, it hangs, stalls, and crashes. Once I force quit it, I can launch it normally. So recap:
Launch System Preferences: Hang, Force Quit
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A minor annoyance but still an annoyance

You are not alone friend, I have a 1st gen Macbook Pro, fresh install of Snow Leopard, new user account, NO migration, all updated, and all voodoo done as well (repair permissions, chkdsk, blah blah blah). I have to launch System Preference, watch it hang, force quit, and relaunch successfully. Works that way EVERY time. If I wait too long, I can't open it. Now I open it and just leave it open all day. If I didn't change so many settings so often, I wouldn't care. This entire experience of upgrading to Snow Leopard has sucked. Shame on you Apple.

System Preferences hangs with Mountain Lion

Various parts of system preferences hang under Mountain Lion. Prior to upgrade there was no problem. Any ideas?

I am still having this problem as well. Multiple panes will fail to launch. A reinstallation of ML failed to fix this. I even did a fresh reinstall, manually copying over my Documents, Music, Pictures, and other essential files to a backup drive beforehand. Almost all System Preferences fail to launch. A list of those that fail:
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Security & Privacy
Notifications
iCloud
Mail, Contacts, & Calendars
Date & Time
Software Update (The only one that seems to extend beyond the preference pane. Software update will not launch, even though I know there are iPhoto and iTunes updates to be downlaoded.)
Dictation & Speech
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JNI System.loadLibrary troubles

Hello again!
I am so close to finishing this program I can taste it! But�
OK, I am doing a bit of JNI. All appears to be well except my program can�t seem to use
System.loadLibrary("myCPPdll");
to find the dll file I need to run the C++ code.
I�ve tired replacement with
Runtime.getRuntime().loadLibrary("myCPPdll ");
just for grins with the same result.
I also tried
System.loadLibrary("C:/fullPath/myCPPdll");
with no luck.
The error message I get, regardless if I run from the command line or via Eclipse is
java.lang.UnsatisfiedLinkError: no myCPPdll in java.library.path.
Possibly related: when I use the tutorial form
Static
System.loadLibrary("myCPPdll");
my compiler tells me it can�t find the main. Just how critical is it to have it in this static format? It compiles great without the System call embedded in the static{} block!
Thanks for your time!

I added the .dll and get the same error. It was my
understanding that System.loadLibrary(fileName)
automatically added the file to the library path for
the individual program in question. If this is not
the case, could you please elaborate a bit on adding
it to the path?
No, in effect it searches the path to find the dll library. You need to (re-)read the tutorial -
http://java.sun.com/docs/books/tutorial/native1.1/stepbystep/step5.html

Display on Qosmio F60-10U Turns Mozaic and System Getting Hang

From The Day I purchased F60-10U; i am facing thins problem. My display occasionally Turns into Mozaic and same time System Getting Hang. only thing i can do is restart with power button.
i had given to service center; they told that its because of virus and need to be formatted. as i was 100% sure that its not because of virus; i took back from there.
I had tried below:
1. Update Display Driver
2. Downgrade Display Driver
3. Factory reset
4. Scan for virus with various engines
5. Updated All Drivers
Nothing works...
Anybody else has got same problem?
Hope that i can get some fix for this.
Here is a Picture of Display when its Happens.
Link:[http://www.glowfoto.com/static_image/11-120740L/7879/jpg/09/2010/img4/glowfoto]
Rgrds,
Chintan

I dont think this issue has anything to do with virus and I believe graphic card is defective. All you have done is right and after factory image installation virus will be killed and everything should work well.
Contact service again, let them test with factory settings and if the same will happen again I presume they will exchange motherboard.

TS3742 I have an iMac 24" system. I just recently installed MAC OS X 10.7.4 (Lion) on my system. Since doing so, my system consistently hangs. Particularly when using iMovie and iPhoto.

I have an iMac 24" system. I just recently installed MAC OS X 10.7.4 (Lion) on my system. Since doing so, my system consistently hangs. Particularly when using iMovie and iPhoto. I have to power off my system to get it running again. Any suggestions on what I can do to address this situation.

I would first reset the SMC:
Shut down and unplug the Mac.
Keep the Mac unplugged for at least fifteen seconds.
Plug the Mac back in and do not turn it back on for at least five seconds.
Press the power button to turn the Mac back on.
Then I would reset the PRAM by rebooting the iMac while simultaneously holding the Command-Option-P-R keys until the machine restarts a second time.
Let us know if these procedures don't solve the problems.
Hope this helps

System.loadLibrary Hangs

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