How to unload native libraries?

Hi,
we have written a J2EE application which needs native libraries (DLL's). Every time that we redeploy the ear file the DLL does not get unloaded and reloaded 'coz it seems 2 B loaded by a classloader which is not a child of the ear classloader. Is there a way we can unload and reload native libraries (DLL's)? Right now, the only way 2 get around this problem is 2 restart the application server (Weblogic 7.0) which is a pain!
Thanx in advance
Sid

Is there a way we can
unload and reload native libraries (DLL's)?Yes and no.
There is no way to doit in java.
There is a way in C/C++.
You create two dlls. One with the code and one that just proxies to the other dll. The proxy also loads and unloads the dll as it changes and keeps track of the methods.
If the actual interface to the dll changes then it is somewhat more problematic. If the proxy uses va_args then it can handle that as well.
Obviously care must be taken in what is being done in the dll. For instance static values would have to be re-initialized with the correct values. That is going to be difficult if a method in java drove the initialization.

Similar Messages

Unloading Native Libraries in java

Hi all,
This is what i have read from a document.
The VM calls JNI_OnUnload when the class loader containing the native library is garbage collected.
When the class loader containing the native library is garbage collected, will the native library gets unloaded.

Well it should be unloaded:
"The benefits of the new approach are:
1. Name space separation based on class loaders is preserved in native libraries. A native library cannot easily mix classes from different class loaders.
2. In addition, native libraries can be unloaded when their corresponding class loaders are garbage collected"
As stated in the same document.

The struggle of creating a Custom ClassLoader for Native libraries

Hello Everyone,
I'm having a really hard time writing and using my own ClassLoader in a Java Applet.
Context :
As the this link shows - http://codethesis.com/tutorial.php?id=1 - loading and especially unloading native libraries through Java requires defining our own ClassLoader, and use it to instantiate a class loading a library. When the class using native libraries has finished execution, setting all references to the classloader and calling the garbage collector will cause the native library to be unloaded. The class to load within the custom classloader is thus read byte after byte from the jar and defined using the Classloader.defineClass(..) function. So that's what I did. But I've got two problems.
Problem 1 :
On one single machine over 15 tested, the magic number of a given class read from the Jar using Applet.class.getResourceAsStream(classname) takes a value different from CAFEBABE and the defineClass function then throws an "Incompatible magic value" exception (see below). The workaround I found is to force the first 4 bytes of the byte array read from the class with CAFEBABE. But I still would like to understand why it takes a different value on this machine.
Exception in thread "thread applet-MyApplet.class-1" java.lang.ClassFormatError: Incompatible magic value 409165630 in class file Reader
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at NativeClassLoader.findClass(Unknown Source)
Problem 2 :
On windows, the NativeClassLoader works perfectly, but on Linux, I'm getting a java.lang.VerifyError (see below).
Code is compiled with java 1.6.0_06 on windows XP. I tried to remove everything related to native code (remove .so load), the same error is raised.
java.lang.VerifyError: (class: Reader, method: <clinit> signature: ()V) Illegal instruction found at offset 1
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getConstructor0(Class.java:2699)
at java.lang.Class.newInstance0(Class.java:326)
at java.lang.Class.newInstance(Class.java:308)
Code :
NativeClassReader (custom) :
public class NativeClassLoader extends ClassLoader {
 //the unique instance of the NativeClassLoader
 private static NativeClassLoader instance;
 private NativeClassLoader () {
 super(NativeClassLoader.class.getClassLoader());
 * Get the Singleton instance of the class
 public static NativeClassLoader getInstance () {
 if (instance == null)
 instance = new NativeClassLoader();
 return instance;
 public static void dispose () {
 instance = null;
 * Load a class using its full java name (prefixed with package)
 public Class findClass (String theName) {
 byte[] b = null;
 try {
 b = loadClassDataFromJar(theName);
 Class clazz = defineClass(theName, b, 0, b.length);
 resolveClass(clazz);
 return clazz;
 } catch (Exception e) {
 return null;
 * Gets the bytes of a class file stored in the current jar using
 * its full class name
 public byte[] loadClassDataFromJar (String theName)
 throws Exception {
 String filename = "/" + theName.replace('.', '/') + ".class";
 InputStream is = SawsApplet.class.getResourceAsStream(filename);
 BufferedReader br = new BufferedReader(new InputStreamReader(is));
 //compute file size
 Vector vChars = new Vector();
 int c;
 while ((c = br.read()) != -1)
 vChars.add(new Byte((byte) c));
 //fill in byte array with chars read from the buffer
 byte[] buff = new byte[vChars.size()];
 //workaround for a bug on one (some) Vista machine(s)
 //force magic number to CAFEBABE instead of 18635F3E
 if (vChars.size() > 3) {
 buff[0] = (byte) 0xCA;
 buff[1] = (byte) 0xFE;
 buff[2] = (byte) 0xBA;
 buff[3] = (byte) 0xBE;
 for (int i = 4; i < vChars.size(); ++i)
 buff[i] = ((Byte) vChars.get(i)).byteValue();
 return buff;
}Reader (loading native libary) :
public class Reader {
 static {
 System.loadLibrary("myLib");
 public static native String getData();
}Main :
 NativeClassLoader cLoader = NativeClassLoader.getInstance();
 Class clazz = cLoader.findClass("Reader"); // ClassFormatError thrown here
 Object reader = clazz.newInstance(); // VerifyError thrown here
 Method m = clazz.getMethod("getData");
 String s = m.invoke(reader);
 print(s);
 s = null;
 m = null;
 reader = null;
 clazz = null;
 cLoader = null;
 NativeClassLoader.dispose();
 System.gcAny ideas would be really appreciated :-)
Guillaume

Are you using the executable exe file and the filename as a parameter in the custom task?
Andreas Baumgarten | H&D International Group

Native libraries in ABAP runtime

Hello
I have a question. Im developing application which is doing lots of XML processing (quite complicated and time consuming). Since XML support in ABAP itself its very poor we decided to use Java libraries on external server. Comunication between java and abap is done via Jco. But ... the best solution could be if we could use native libraries (java or C JNI wrapper to java) in ABAP. Is there a method or approach to expose interface in ABAP OO and then code implementation to use native library. How to deploy such library in R3.
I saw that all classes from iXML are connected somehow to native runtime.
Does anybody know how to do that, or just can point me to any documentation or example ?
Best regards
Marcin

Can you make sure this native library is in the PATH(Windows) or LD_LIBRARY_PATH
(UNIX)?
Cameron Purdy wrote:
That has nothing to do with it being an EJB. It just means it can't find the
code to call.
Peace,
Cameron Purdy
Tangosol, Inc.
Clustering Weblogic? You're either using Coherence, or you should be!
Download a Tangosol Coherence eval today at http://www.tangosol.com/
"marc claeys" <[email protected]> wrote in message
news:3cd7e60a$[email protected]..
Everywhere I read not to use (load) native libraries in a bean.
However I couldn't find a reason for not doing so I tried.
The loading of the lib. is successful but when trying to call
a function of it I receive:
java.lang.UnsatisfiedLinkError: beanHelloWorld
Could someone explain why this happens?
Thanks in advance
Marc
Rajesh Mirchandani
Developer Relations Engineer
BEA Support

Using native libraries in web application (weblogic on linux)

I have a problem with loading native libraries for use with my web application. Where do I have to put them in order for the server to see them? The same app on windows runs perfectly fine, because it has no problems finding the dll files.
 So far I have tried modifying the weblogic startup scripts, to include the library in LD_LIBRARY_PATH environment variable. I've also tried modifying the security policy just in case, but I don't think it's the case, because like I said, the app ran fine on windows without messing with the policies. So, any ideas, how I could load the libraries?
 The system is a WebLogic 8.1SP4 installed on Linux i386 using JRockit JVM, the native library in question is JAI 1.1.3-alpha native acceleration library.
 PS. if it's in the wrong group, please direct me to the correct one.

Fukiku,
 Did you get this working?
 You can also try setting the environment variable java.library.path.
 Please post your stack trace to the forum as well.
 
 Hussein Badakhchani

JMF with Native Libraries as Signed Applet

Hello
After spending a few days hunting through forums, digging into JMF source code and hacking in the dark I'm about to give up, but thought I'd start yet another thread on this. It's a long, sad story...
Problem: Deploying a JMF based program that relies on native libraries (in this case the FOBS4JMF bindings) as an applet: how to get jmf.properties and the native libraries loaded properly.
Partial Solution: the native libraries packaged in a signed jar file, added to the applet's archive property, extracted using getResourceAsStream(), and loaded using System.load(). This is how FOBS4JMF loads it's native library anyway (via the com.moesol.NativeLibraryFinder):
Class classInApplet; // name of a class loaded by the applet
File outputFile; // location for extracted library
InputStream is = classInApplet.getResourceAsStream(resource);
copyStream(is, outputFile);
System.load(outputFile.getAbsolutePath());Why this doesn't really work:
(a) JMF (com.media.util.Registry) only searches for jmf.properties (which contains the instructions to use the FOBS4JMF plugin) in real folders (i.e. not jars) on the classpath of the local machine. I could extract the jmf.properties to a folder on the local machine, but have no way of making sure that folder would be on the classpath. Calls to "System.getProperty("java.class.path") give varying results - including an empty string on FF/OSX. Even if i could get the classpath somehow, chances are that it wouldn't contain any folders writable under Vista's UAC, which would leave me out of luck.
JMF also looks for a file called ".jmfdir" in various platform specific locations, and appends the contents of this file to the classpath, so if i could write to that file i'd be golden. This seems like it would work on non windows platforms, because JMF looks for that in "user.home"). However, from what i can tell, on windows, JMF uses a native call to a function called nGetUserHome() to determine where to find .jmfdir - which leads to the second problem...
(b) the JMF native libraries are loaded through calls to System.loadLibrary(), not System.load(), which means that they have to be on the "java.library.path" in order to be found - and again, I have no way of extracting the libraries to a directory on that path (at least not one writable under Vista UAC). This wouldn't be a problem, as I could pre-load the libraries myself with System.load(), except that JMF throws an exception if it can't find one, and stops trying to do whatever it thinks it needs the library for. Again, not a problem if I use only the FOBS4JMF native code (though i would like to use the DirectAudio renderer on windows) - except that the nGetUserHome() function described above is in a native library (jmutil.dll). So, when com.media.util.Registry.getJMFDir() tries to find ".jmfdir" it first tries to load "jmutil.dll" using System.loadLibrary(). This throws an exception inf "jmutil.dll" is not on the "java.library.path", and com.media.util.Registry.getJMFDir() returns null. Here's the relevant code from com.media.util.Registry.getJMFDir() - with my annotations
All of these problems are fixable by relatively minor tweaks to the JMF source - but I don't think that's allowed under the SCSL. So if anyone has any, i mean ANY other suggestions, please BRING 'EM ON.
thanks
-chris
EDIT: just for kicks, i checked to see where JMF expects to find .jmfdir on windows - ie the result of nGetUserHome(). At least on XP this seems to be c:\WINDOWS. if it's the same on Vista, then fixing the loadLibrary problem won't help bc I still won't be able to write to this file.
Edited by: wodenx on May 7, 2010 9:46 AM

Hi-
Thanks for responding so quickly.
As far as the natives go, you might try using the new JNLP embedded applet ability in the plugin2 architecture.I was going to look into that, but decided it wasn't necessary since I can get the FOBS native code to link properly. It's really the registry that's the problem, since without solving that I can't get JMF to USE the FOBS code.
Can you get it all to work if the JMF installer is invoked? If so, perhaps if you add an installer-desc that calls the normal JMF setup.exe (though that final warning to reboot is both unnecessary and odious).I don't think it would work even with the JMF installer, bc I need to point JMF at the FOBS specific jmf.properties. I might be get it to work by invoking my own installer though, to place my jmf.properties somewhere in the native class path, so that's worth looking at. Thank you. Problem there is that on Vista users would have to elevate to run the applet, which is not ideal.necessary and odious).
Why do you particularly want to embed media in a web page?The customer may want it. I might be able to convince them to go with JNLP/WebStart, but I think I might have the same problem there. Please correct me if I'm wrong...
I've also read that there are problems with JMF and JNLP owing to the fact that JMF doesn't recognize the security manager invoked by JNLP, and so gives your program no permissions. Haven't tried it myself yet.
Thanks again!
Edited by: wodenx on May 7, 2010 12:07 PM

Native Libraries and Swing

Hi everyone,
I have a problem with the awt/jfc packages...
I'm making a p2p client which sends a request to a server (as a part of the client) which respondes in to this request. Sending and responding to the request takes a couple of milliseconds. My problem arise when I want to transfer files - When the server notice that a filetransfer is incoming, it should pop up a filedialog to define the target file to store the data. To spice things up I've created a custom frame and filedialog which extends JWindow. This works great, but the loadingtime sucks! If I remove EVERYTHING from the constructor in the filedialog, the creation of an instance (which now does nothing,doesn't even call super) takes about 14 seconds! How can this be?? The conclusion I've reached is that this only occurs during the instantiation of the first graphical component, meaning that it loads the native libraries during this instantiation. But how can this take 14 seconds??? If anyone knows why and,even more important, how to solve this, please let me know...
Regards,
Andreas Nilsson

The source of all evil was a simple deadlock.

Defining Native Libraries? (Unsatisifed link error)

I am testing an application that we previously had working on 10g release 2 (as well as Tomcat and WebLogic, all on Windows). At the moment my application can't find a couple of native libraries, which should be easy enough to fix. Just set the java.library.path.
My problem is that I can't find anywhere in the Oracle 10g administration to specify the locations of the libraries or set the java.library.path that is used. How is this done?
I added the location to the PATH environment variable (which 10g seems to ignore) and I have tried following the docs at http://download-west.oracle.com/docs/cd/B14099_12/core.1012/b13996/oc4j.htm#sthref394 (although I realise this is for release 2 and not release 3) without success.
I've search the forums and this seems to be an oft asked question. Does anyone know how to do it, or can point me at the documentation?
Cheers

Thanks Maro, but I have already tried that without success I am afraid. I had added the following:
<environment>
<variable id="LD_LIBRARY_PATH" value="C:\Program Files\Documentum\Shared" append="true" />
</environment>
I still get "java.lang.UnsatisfiedLinkError: no dmcl40 in java.library.path"
And, indeed, when I look that the java.library.path all I have is
C:\product\10.1.3\OracleAS_1\jdk\bin;.;C:\WINDOWS\system32;C:\WINDOWS;
C:\product\10.1.3\OracleAS_1\opmn\bin;C:\product\10.1.3\OracleAS_1\opmn\lib;
C:\product\10.1.3\OracleAS_1\bin;C:\WINDOWS;C:\WINDOWS\system32
The folder C:\Program Files\Documentum\Shared is also in my PATH environment varibale (which Oracle is ignoring for some reason).
This is really frustrating. :o(

Native Libraries

What is the effect of loading native libraries into a WLS instance? Is this
forbidden/frowned upon/ok ?
One effect we have seen is that may be related is that if a native library
is not properly unloaded - either via WLS crash or just poor programming,
restarting the WLS instance is not possible as it belives that the port is
still in use (by another process) What is the relationship here?
thanks,
g

Loading native libraries is not recommended, however, not forbidden.
Writing a stable native code is not easy, if your native code screws up
(such as memory leak), in most cases, weblogic will screw up too.
For restarting, if you restart weblogic, weblogic can use its port. Once
weblogic is killed, OS will release its port for reuse.
My 2 cents.
Cheers - Wei
Garrick Evans <[email protected]> wrote in message
news:8itojp$b0j$[email protected]..
What is the effect of loading native libraries into a WLS instance? Isthis
forbidden/frowned upon/ok ?
One effect we have seen is that may be related is that if a native library
is not properly unloaded - either via WLS crash or just poor programming,
restarting the WLS instance is not possible as it belives that the port is
still in use (by another process) What is the relationship here?
thanks,
g

Calling native libraries from OC4J (howto config)

Hello folks,
I need your help. I am trying to set up OC4J so that I can call native libraries from my servlet. Could you point me to the respective documentation or give a hint on how to configure OC4J for this? Thank you.
GKK

gday GKK --
I don't have an example, so I'm working from memory here and assuming you are using OC4J standalone.
There's two aspects which need to be considered:
1: the Java wrapper classes you have which call out to the native libary.
2: the native libs themselves (which I'll call a .dll from hereon in for simplicity).
What you would need to do is make sure the Java wrapper classes are all available to the web application. This can be done by either packaging them in a jar file and putting it into the web-inf/lib directory of your web application, or leaving them in an unpackaged form and putting it into the web-inf/classes directory.
I do vaguely remember helping someone debug a JSP tag lib issue once before which used native code and we ran into some problems with concurrent use of the same DLL (a Java restriction) because a DLL can only be registered once per JVM instance and the threading model meant it was being loaded more than once -- but it may have also had something to do with the JSP taglib cache.
If you do get some form of Java runtime exception showing concurrent access error for the native lib, what you can do is move the lib with the Java wrapper classes into the global classpath (j2ee/home/applib) meaning it's only ever loaded once..
Then what you need to do is make sure the DLL itself is accessible to the Java process -- on Windows this is done by making sure directory holding the DDL is set in the PATH environment variable before -- before starting OC4J. On other platforms, it can be done using the LD_LIBRARY_PATH environment variable.
That should be all you need to do to make it work.
cheers
-steve-

Standalone OC4J 9.0.4 - Loading Native Libraries - Unsatisfied Link Error

Hello,
I incidentally happen to have a similar problem as has been described in several posts in this forum. The problem is that of loading Native libraries in OC4J.
The scenario is
1) Environment is Standalone OC4J 9.0.4, Windows 2000, JDK 1.4.2
2) A Java wrapper loads DLL1 which internally loads DLL2.
(To be more specific the DLL1 is a SAPSSOEXT.DLL and the DLL2 is SAPSECU.DLL. These are used for establishing SSO with SAP portal)
The phase-1 of Java wrapper loading DLL1 is achieved by setting either the PATH or the java.library.path variables.
The phase-2 of DLL1 loading DLL2 is what is failing with an Unsatisfied Link Error.
Since I am using a standalone version and not a OC4J app-server, the OPMN related configuration for specified PATH variables will not be relevant here. Is there any other place where I can configure these.
regards
Shivaram

A small correction to my observation above.
The call to load DLL1 via System.loadLibrary() is successful. However when I attempt to call any method on it it fails with UnsatisfiedLinkError.
Contrary to what was written above the error occured even before DLL1 attempted to load DLL2.
So why is it that the call to loadLibrary is successful but the call to actual function is failing? (This works flawlessly on the command line)
Is this a path problem, if so how do I configure it in OC4J standalone. Variables PATH, java.library.path, LD_LIBRARY_PATH none of them seem to have any effect on this.
I tried debugging using a windows file monitor. The library DLL1 is being read from the correct path and is being opened successfully.
Any suggestions will be greatly appreciated.

Parent class loaders are not searched for native libraries?

I'm loading a native library in the default system classloader. I think create several new children of the default class loader and instantiate some new objects in those child classloaders. The problem is that those new objects get a LinkUnsatisfiedError when they try to call the native methods.
I was under the impression that ClassLoaders would delegate native method class to their parent class loader, the same way that they do when searching for class definition. This is confirmed by this quote from http://java.sun.com/docs/books/jni/html/design.html:
"Because each class loader maintains a set of native libraries, the programmer may use a single library to store all the native methods needed by any number of classes as long as those classes have the same defining loader."
I'm in a serious catch-22 here, because I cannot load the native library in the child classloaders (native libs are not allowed to be loaded by multiple class loaders), and I need to put the objects in a separate classloader. What is the solution?

i.getClass().getResourceAsStream("/hello.txt"); //this should be disallowedWhy is getting a resource so bad? It puts a dependency on a module, but in a plugin system, dependencies should be supported. Netbeans platform supports this same thing. I use image resources from some core modules at my own risk. If you really want to block it, override the getResource method of URLClassLoader to block unwanted resource fetching. You will have to use the SecurityManager, AccessController, ProtectionDomain, and AccessControlContext and I'm not going to tell you how ;)
i.getClass().newInstance(); //something even worseNot possible to block without package private constructors or similar restrictions as above.

ADSSAP native libraries missing - NW2004s SP12 installation on HP-UX ...

Hi Experts,
We have installed NW2004s SP 12 server on HP-UX, then after we have configured ADS as per the installation manual. Unfortunately OS Native libraries are missing in the following path ...
/sr/sap/EPL/JC03/j2ee/os_libs/
I'm not sure whether HP-UX is a supporting environment for running ADS?
If yes, how should i get those compatible native libraries for my installation.
Due to above reason we couldnt able to run Interactive forms.
Please leave your advice on this.
Thanks
MMK

Hi Swathi,
HP-UX IA64 is a non-supporting platform for ADS, so installed ADS on supporting environment and then configured.
Thanks
Mohan krishna

How do I transfer Libraries from one computer to the other?

ok i know this might sound like a dumb question but i have no idea how to do it how do i? i downloaded another library onto this computer but it wouldnt transfer any of my songs so how do i transfer libraries??

Probably the most straightforward way to get iTunes onto your new computer is to network it with the old one and copy your iTunes folder across. This works fine if you have been using iTunes to completely manage your music and all your songs are in iTunes Music not in different folders. You can also use this method with an external hard drive, you drag the folder from the old computer to the external drive and then from the drive to the new computer. If the songs in your library are not all in the iTunes Music folder you can consolidate them. When you consolidate, any songs in the iTunes Library that are not in the iTunes Music Folder are copied to the Music Folder and the Library is updated to point to those new files. Files already in the iTunes Music Folder have no changes made to them: Copying all your iTunes files to one location - Windows
Copying the whole folder brings with it the iTunes Music folder and also the iTunes Library (iTunes Library.itl in Windows) database file which holds all the information about your songs (Playlists, Ratings, Play Counts, Last Played, Date Added, etc). You'll get more information including the Folder/File structure in this article: What are the iTunes library files?
When you copy the iTunes folder make sure you put it into the same location on the new computer. This has to be the exact same place, on a PC this is \Documents and Settings\Username\My Documents\My Music\. When you open iTunes on the new computer it will be the same as on the original one Songs, Playlists, Play Counts, Ratings etc. When I moved iTunes a while ago for my daughter I was also using the same version of iTunes, not sure how important that is but it's probably worth keeping them the same.
If you have an iPod it can be used as an external drive and you can move the iTunes folder onto it: How to use your iPod to move your music to a new computer

How to symlink vendor libraries in DW? It doesn't consider that a library is in the local site folde

Here's my question on Stackoverflow.
http://stackoverflow.com/questions/13223428/how-to-symlink-vendor-libraries-in-dw-it-doesn t-consider-that-a-library-is-in
And here I duplicate it. Please see on Stackoverflow because I'm afraid I'll not be able to format my question here right way using these forum tools.
I use Win XP and Dreamweaver. I have ZF2 project. Here its "site root directory", using DW words:
application_root/
    config/
        application.config.php
        autoload/
            global.php
            local.php
            // etc.
    data/
    module/
    vendor/
    public/
        .htaccess
        index.php
    init_autoloader.php
I have it here C:\xampp\htdocs\mySite
In /vendor directory there must be ZF2 library. But I have it in other directory'C:\xampp\htdocs\ZF2' and just want to put symlink to it in my /vendor directory.
But if do so DW considers that ZF2 library is outside of my project directory. For example I want to require a class:
require_once('\Zend\Mvc\Application.php');
But DW says:
This file is outside of the root folder of site "mySite", and may not be accessible when you publish the site... Would you like to copy the file there now?
No, I don't want to copy. I don't want to make a score of the same library in every directory of my projects. But DW seems doesnt allow to do it. It makes me to copy only.
So my question is. Is it possible to set DW that it allows to use symlinks to include libraries which are not in the "site root directory"? How to do it?
I've read this http://www.adobe.com/devnet/dreamweaver/articles/setup_php.html , but it doesn't help. It has one sentence about the problem and that's all it has. It absolutely doesn't give the answer how to solve it.
However, this results in two identical copies of every file. Instead it's common practice to store project files in a folder inside the document root of the testing server, which is what you'll do in this tutorial.
And there is nothing in the tutorial about the problem.

Non-Windows browsers do not have a concept of a "trusted" site. In Windows, IE and Chrome do not repeatedly prompt for credentials because they use the user's login credentials on the desktop. Other devices do not have this capability. Instead,
you need to use something like ADFS to authenticate users.
Trevor Seward
Follow or contact me at...
&nbsp&nbsp
This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

How to unload native libraries?

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