Library names in java ( JNI )

I want to load library name called MathLib.
but i am getting error like below..
Exception in thread "main" java.lang.UnsatisfiedLinkError: no MathLib in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1517)
at java.lang.Runtime.loadLibrary0(Runtime.java:788)
at java.lang.System.loadLibrary(System.java:834)
at MathLib.<clinit>(MathLib.java:12)
i want to know is MathLib is available or not..
if yes
i want an example on this MathLib and also some library names in Java

i mean if mathlib is available i want one example
program on that.I have no idea whether it is. Did you try Google?
and u r telling that mathlib is not available.I just said it's not available to your program.
now i want to know the library name which one have to
give in the above line code.The file name of the library you want to use, of course. How would we know which one it is? mathlib.dll?

Similar Messages

Library name compatibility 32/64 bit and across platforms

Hi all,
I have a numerical C library which I wish to link to using JNI. The binary will be shipped in the jar file to keep everything "clean" for the client.
Unfortunately the SUN System.mapLibraryName method is completely useless when it comes to bundling binaries that are specific to an architecture. Some tests I have performed show:
Linux 64 bit Pentium M: os.name = "Linux", os.arch = "amd64", mapLibraryName = "libNAME.so"
Linux 32 bit: os.name = "Linux", os.arch = "i386", mapLibraryName = "libNAME.so"
iBook G4: os.name = "Mac OS X", os.arch = "ppc", mapLibraryName = "libNAME.jnilib"
Windows XP 32 bit: os.name = "Windows XP", os.arch = "x86", mapLibraryName = "NAME.dll"
Sun Blade 1500 (64 bit): os.name = "SunOS", os.arch = "sparc", mapLibraryName = "libNAME.so"
you will notice that Linux 32/64 and Solaris all use "libNAME.so"... despite the architecture they are running on! (Apple is not a problem because it supports Universal binaries).
I'm thinking that I will have to use some horrible library name and loading code to deal with these problems... creating library names along the lines of
Linux 64 bit Linux: "libNAME-linux-intel-64.so"
Linux 32 bit Linux: "libNAME-linux-intel-32.so"
Linux 32 bit PPC Linux: "libNAME-linux-ppc-32.so"
iBook G4: "libNAME.jnilib"
Windows XP 64 bit: "NAME-64.dll"
Windows XP 32 bit: "NAME-32.dll"
Sun Blade 1500 (64 bit): "libNAME-sunos-64.so"
My main concern is Linux and Windows 32/64 bit, rather than cross-CPU handling.
I am not looking forward to writing this... has this problem come up before? And if so, what have people done to deal with it? I guess an alternative would be to use a naming convention in the directory structure, but that's really the same solution.
Kind regards,
Sam

I have concluded that the best way to solve this problem is to create a pre-processing method for System.loadLibrary that takes the library name (as it would be passed to System.loadLibrary) and returns a more operating system and architecture-friendly String.
I have created a class that does OS/Architecture detection and then returns the following on various platforms for the input parameter "name":
Apple (G3, G4, G5, Intel): "name" (expects user to build Universal Binaries)
Linux (i686): "name-linux-x86"
Linux (Intel/AMD 64): "name-linux-x86_64"
Linux (sparc): "name-linux-sparc"
Linux (PPC 32 bit): "name-linux-ppc"
Linux (PPC 64 bit): "name-linux-ppc_64"
Windows XP/Vista (i686): "name-windows-x86"
Windows XP/Vista (Intel/AMD 64): "name-windows-x86_64"
Sun Solaris (Blade): "name-sun-sparc"
Sun Solaris (Intel 64 bit): "name-sun-x86_64"
This String can then be safely sent to System.loadLibrary, which will do the usual additions of "lib", ".so", ".jnilib" and ".dll" and search in all the right places. It is not possible to write a wrapper for System.loadLibrary itself as native library loading needs to know the name of the calling class.
I'd be happy to share the code with anyone who requests, but it's a bit too long to post here.
Incidentally... in my research into native library loading, I encountered the "Bundle-NativeCode" entry for Manifest files. It may be possible to construct an entry for each os.name/os.arch pair to assign native binaries accordingly. However it appeared that every pairing would need to be specified (whereas my solution is more forgiving), and I'm not entirely sure if that method allows one to define the (shortened form of the) library name... it may just be useful for bundling binaries inside the jar file.

Include a C++ library in a Java program

Hi,
my question is if I could include a C++ library in my java program and, in that case, how to do it.
Thanks!

my question is if I could include a C++ library in my
java program and, in that case, how to do it.
Although JNI allows that keep in mind that certainly in some cases it is easier to create a C++ application (executable) and then have java communicate with that app.

What are the simple to use COM library in your java code

Hi,
what are the simple to use COM library in your java code

PhHein wrote:
[javax/comm|http://java.sun.com/products/javacomm/reference/api/javax/comm/package-summary.html]
No, he wants to use Windows COM objects!
@OP
It's not easy. You can try j-integra or ezjcom, which I tried years ago and was not too happy, but maybe
they improved or they are just fine for your needs. $$$ involved!
If you want to do it by yourself, it won't be easy at all, I promise, but it can be done with JNI or JNA.
If your interactions are very few and simple, maybe some workarounds could be found.

PKCS#11 library issue on Java 5

Hi,
I'm facing problem with PKCS#11 library name using SunPKCS11 in Java 5. My sample program runs successfully either providing only PKCS#11 library name or providing library name with absolute path in Java6.
My sample code is given below:
String str_pkcs11Config = null;
str_pkcs11Config = "name = Gemalto \n" + "library = *gclib.dll*\n" + "slot = 0";
System.out.println("Configuration : \n" + str_pkcs11Config);
java.io.ByteArrayInputStream bais = new java.io.ByteArrayInputStream(str_pkcs11Config.getBytes());
Provider obj_provider = new SunPKCS11(bais);
Security.insertProviderAt(obj_provider, 1);
KeyStore obj_keyStore = KeyStore.getInstance("PKCS11");
obj_keyStore.load(null, "password".toCharArray());
for (Enumeration list = obj_keyStore.aliases(); list.hasMoreElements(); ) {
String str_keyAlias = (String) list.nextElement();
if (obj_keyStore.isKeyEntry(str_keyAlias)) {
System.out.println("Key Alias : " + str_keyAlias);
X509Certificate[] certChain = (X509Certificate[]) obj_keyStore.getCertificateChain(str_keyAlias);
if (certChain != null) {
for (int i = 0; i < certChain.length; i++) {
System.out.println("Subject DN : " + certChain.getSubjectDN().toString());
Platform is windows XP. The above program fails with Java5 with following error:
java.security.ProviderException: Library gclib.dll does not exist
at sun.security.pkcs11.SunPKCS11.<init>(SunPKCS11.java:109)
at sun.security.pkcs11.SunPKCS11.<init>(SunPKCS11.java:80)
gclib.dll is in PATH i.e. WINDOWS/System32/
But the above program works fine on Java5 if i specify the full path for gclib.dll. Please tell me how should i get rid of this problem. I don't wana specify full path for library.
Thanx in advance.
Regards,
Israr Ahmed

It sounds like we are hitting the same issue.
I actually had success using the 32-bit library found here: /opt/nfast/toolkits/pkcs11/libcknfast.sl.
As you mentioned, the 64-bit library is found here: /opt/nfast/toolkits/pkcs11/libcknfast-64.so
Unfortunately, the system I was working on is in a customer test lab, so I don't have access at the moment. A few other things that I was going to try were:
1. Renaming the 64-bit library to either libcknfast.sl or libcknfast.so. Maybe Oracle makes assumption about the filename of the library?
2. Setting the environment variable LIBPATH=<directory containing library> (either in /opt/oracle/extapi/64/hsm/ncipher/1.58.42/ or /opt/nfast/toolkits/pkcs11/) and verify by running “su - <user>” where <user> is the name of the Oracle process.
3. Sifting through Oracle Configuration files to make sure that the path to the library hadn't somehow been altered to be incorrect.
Perhaps you can try these and report back? I can't access my problem system without going on-site, unfortunately.
Also, do you have the ability to log a Service Request @ https://metalink.oracle.com? I am negotiating to purchase this ability, but cannot at the moment.
Message was edited by:
cglidden

If I use "JSP - Java - JNI" ??

When the Java -> JNI -> C is writen and tested OK.
How can I use JSP to import the Class into JSP page???
I tried. But failure.
Have someone show a sample?? help~ Q_Q

Thanks you again... ^_^ to help
All My step and files are shown below:
--[1 step]--------[ JSP file ]--------------------------
<jsp:useBean id="myBean" scope="page" class="Counter"/>
<jsp:getProperty name="myBean" property="count"/>
--[2 step]---------[ write JavaBean ]-----------------
public class Counter{
public Counter(){}
public native String printt(); // It's Native entry
public static void main(String[] args){ // This just for Java in DOS runable.
new Counter().printt();
public String getCount(){
return(new Counter().printt());
@@@@@@@@@@@@@@@@ <= the server will call getCount() method, which the DLL's create the printt() method.it may cause the 1st errors because can't find printt().I guess.
public void setCount(int newCount){}
static{
System.loadLibrary("HelloWorld"); //LOAD the DLL's from C create
---[3 step]------ [ Create Counter.h ] -- CMD:[ javah - jni Counter ]---------
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class Counter */
#ifndef IncludedCounter
#define IncludedCounter
#ifdef __cplusplus
extern "C" {
#endif
* Class: Counter
* Method: printt
* Signature: ()Ljava/lang/String;
JNIEXPORT jstring JNICALL Java_Counter_printt
(JNIEnv *, jobject);
#ifdef __cplusplus
#endif
#endif
----[4 step]--- [Write HelloWorld.c ]-------------
#include <jni.h>
#include <stdio.h>
#include "Counter.h"
JNIEXPORT jstring JNICALL
Java_Counter_printt(JNIEnv *env,jobject this){
printf("Hello World!\n hihihi success!");
return;
---[5 step]-- [use VC++ 5 to create the DLL from HelloWorld.c ]
---[6 step] ----- The result that Server says -------
500 Internal Server Error
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:195)
...

How to get the current function name in java

How to get the current function name in java.
In c it is done as
printf("%s",__func__);
Thanx in advance.

j0o wrote:
System.out.println("Class Name: " + new Exception().getStackTrace()[0].getClassName() +
"/n Method Name : " + new Exception().getStackTrace()[0].getMethodName() +
"/n Line number : " + new Exception().getStackTrace()[0].getLineNumber());
I pointed the OP at this approach yesterday in one of his multi-posts. I still have not been given my Dukes!

With multiple libraries, why don't I see library name when opening iPhoto?

I have split my iPhoto Library, so that I have one library per year, eg library name: iPhoto 2009. When I open iPhoto, choosing a library, shouldn't I see the library name somewhere? Thanks,
Owen

Generally, when I open iPhoto, the header in the iPhoto window just says "iPhoto", regardless of the library used, but, on one occasion, I did see the library name in the header. I don't know what caused this.
I backup photos to an external HD, but I prefer to also have a backup DVD, at least for the originals. I can't do that with a single iPhoto Library.
Thanks,
Owen

File Name in Java Map

Hello,
I want to add the time stamp in the file name in JAVA map.
Actually we are directly writing the file on to the file system from Java map and also giving its output to other map.
So we need when we write the file on the file system the file name should be ABC_timestamp.
Can anyone help me how to do this in Java Map.
Thanks and Regards
Hemant

Hi,
>>>Actually we are directly writing the file on to the file system from Java map and also giving its output to other map.
are you sure you want to do this?
this is highly inadvisable as mappings do not support restarts and any error handling
further more what if the mapping will crash but the file will be created?
if you restart the mapping you will get a second file?
I'd recomment not doing anything like that - maybe think about your scenario once more ?
Regards,
Michal Krawczyk

Why is the name of java file is same as public class?

hello friends
why we need to assign same name to .java file as the name of public class in .java file? while its not necessary for the class having no modifier?

This question has been asked several times. Serch the forum.
x

Changed library name - FCPX won't open?

Ouch.
I inadvertently changed the Library name of an FCP X file in the Finder Window ... and now FCP X won't open. I immediately changed it back to the original name, and FCP X still won't open. The FCP X logo comes up, and then the app seems to freeze and not open.
Sound familiar?
There must be a work around or a fix, right?
All ears,
Ben

HI Al,
Interesting. And that's why I did the change IN the Finder Window. I couldn't click the Library open IN the app. It was as if frozen. I tried a dozen times to click, or to hit enter when highlighted. So I thought it wasn't something that could be done.
In fact, now that you've encouraged me that such a thing is possible I'm going to try again.
In the meanwhile I had a few crashes, re-installed FCPX, muddled around a bit. It seems to be working now. Could have had something to do with FCPX 10.1.1 working with an earlier project done in FXPX 10.0 ... and when I opened FCPX (I think I opened it to set up another project) there was no automatic request to update the original project. Maybe something weird happened there and caused some kind of corruption. But in the end I did get the original project updated ... and am now learning how to organize in this little beastie.
I did learn something interesting about relinking media though. You can't JUST relink clips to their original media files in FCPX 10.1 ... because when you go to locate your original movie ... it's imbedded in the Library (all those hidden folders), and there is no way to access the library that way. Someone over at Creative Cow created a workaround, quite brilliant I think. It works anyhow. In the Finder Window you 'open package contents', work your way to the folder that contains the unlinked media files, then drag that folder to the margin on the left of Finder Window (where you can drag folders you work on regularly). THEN you can do a relink and work your way to the folder you need that way. Works fine.
I'm going to try renaming my Library now. Wish me luck. So useful to be able to do this.
Thank you kindly Al,
Ben

Tried opening a file in library and it states can't open database with library name? It says Relaunch then will not open? and Blocks me completely from Aperture. I have to go to Finder to Rename it? I need this file how do I get it to open?

Tried opening a file in library and it states can't open database with library name? It says Relaunch then will not open? and Blocks me completely from Aperture. I have to go to Finder to Rename it? I need this file how do I get it to open?

Aftershotz,
You're going to have to give a bit more information.
What do you mean by "opening a file in library?" There is no function of Aperture to open files -- you can open (switch) libraries.
You'll have to be more specific about error messages, too. Perhaps some screenshots would be useful to diagnose your problem. "Can't open database with library name" is not enough detail about what Aperture is really telling you.
nathan

"Check that the library name an prefix are correct." Yep, they are. Now what?

Hello,
I have a customer who is using a Labview wrapper for an IVI driver to create an application to send commands to an LXI instrument. The problem is even the initialize call results in the following error:
Driver Status: (Hex 0xBFFA000A) Check that the library name (VTEXSwitch.dll) and prefix (VTEXSwitch) are correct.
There are no problems communicating with the instrument using a web browser and NI-MAX sees the instrument fine. The customer gets this exact same error when they rename the actual DLL file to something different, which indicates to me that the labview wrapper isn't finding it at all. I've looked everywhere I can think of, but I can't see how Labview is supposed to know the path where it is looking for that DLL.
This same wrapper has worked for a lot of other people. I made sure they had installed the IVI Compliance Package and IVI Shared Components, and tried reinstalling the IVI driver from the manufacturer. The problem is still there. What should I do?

BurlapSage wrote:
I've looked everywhere I can think of, but I can't see how Labview is supposed to know the path where it is looking for that DLL.
Probably it uses the standard windows algorithm as described in MSDN

IPhoto LIbrary name in title bar

Once upon a time iPhoto would show the name of the iPhoto Library in use in the title bar. If, for instance, I decided to create a Library called "Vacations," when I opened iPhoto by option-clicking and chose the Vacations library, the iPhoto title bar would say "iPhoto - Vacations."
I've looked around and see the latest questions regarding this were back in 2006. I've tried a bunch of ways to attempt to get this to pop up, but to no avail.
Any suggestions? Am I missing something?

You can get the library name in the title bar if you use iPhoto Library Manager to select and open your library. That feature works with the free version.
OT

IPhoto 6.0.3 - Library name in title bar?

I just upgraded. I thought that previous versions showed the folder name of the Library in the title bar. Now it just says "iPhoto" and the only obvious way to determine where the library is, is to use the "Show File" item on a photo, and then use the Finder to backtrack up the folder tree. This defeats the ability to have multiple Libraries. Grrr.

Neil:
iPhoto has the library name in the title bar for me. Started with V6 and still does so with 6.0.3. A couple of times witb 6.0.2 it seemed to not do that but then started up again. Didn't do anything to try to correct it but maybe some of my permissions repairs for other issues helped. You might give it a try.

Library names in java ( JNI )

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