J2ME and native methods

is it possible to use native methods within MIDlet, working with J2ME?

on www.jguru.com they say:"For both size and security reasons, JNI is not supported by the J2ME CLDC."

Similar Messages

How to put native methods in jar file

Hi.I have an executable jar file(test.jar) that makes use of other jar files and native methods. For example, test.jar uses Jnpout32.dll. . test.jar , the other jar files and the native methods are all in the same directory. When I created test.jar I wrote a manifest file which specifies the class path of the other jar files and the native methods as follows and provided it as an option in the jar cfmev command.
Class Path: jdbc.jar Jnpout32reg.dll //content of manifest.txt file that I provided to the jar command
//carriage return I then run the command java -jar test.jar to run the file.
All I am seeing is the following error message
Exception in thread "AWT EventQueue-o
"Java.lang.NoClassDefFoundError.
gnu/io/SerialPortEventListner"
{code}
Any ideas? thanks in advance!
Edited by: Nostalgia on May 22, 2009 8:05 AM

You seem to be confusing Java's classpath with your os's path. The classpath only applies to Java classes. See if this discussion helps:
http://www.inonit.com/cygwin/jni/helloWorld/load.html

J2ME SDK 3 and Siemens - preverification error: Native Methods

Dear experts,
I am working on this issue for a week, but without success.
Maybe because I am trying to combine something new and old :-(
I tried to use Siemens TC45 GSM java module with j2ME Platform SDK 3.0.
It goes well and I have results until I use standard libraries like:
Import javax.microedition.io.*;But I also need Siemens library so I included:
Import com.siemens.icm.io.*;When building (preverifying stage) I got error:
ERROR: native methods should not appear
If I write similar midlet in SUN ONE Studio 4 ME (with j2me1.0.4) I can preverify it and build midlet without errors. So I assume that I have problems in SDK3.0 with version of preverifier or with some other settings somewhere. Can anyone please point me to the right direction?
Thank you,
Mitja

The issue is resolved. You have to update Java ME SDK 3.0.5 to obtain the fix:
1. Ensure that you have downloaded and installed the latest Java ME SDK 3.0.5 (published on Dec 23, 2011). In the updated 3.0.5 release we have added the Japanese and simplified Chinese localizations and "Update Center" feature that is required to obtain the fix.
2. Run Update Center either from Start menu or from Netbeans "Java ME" menu (in this case you should install Netbeans integration during Java ME SDK installation).
3. Install "Java ME SDK Tools Netbeans Update Site" via Update Center.
4. Restart Netbeans IDE.
5. In Netbeans, go to Tools -> Plugins, Reload Catalog and install "Utilities" update from "Java ME SDK Tools" category.
That's it.
For more details refer to corresponding blog post at: http://blogs.oracle.com/javamesdk/entry/update_java_me_sdk_through
Alexander Burdukov, Engineering Manager for Java ME SDK product.

Calling multiple DLL from Java and calling same native method

i have two dll files named DLL_1.dll and DLL_2.dll .
Both of them contain a native method which has a signature
JNIEXPORT void JNICALL Java_Database_Notify
(JNIEnv *, jclass);
This method is common to both the DLL
Now i load both of the DLL's using,
System.loadLibrary("DLL_1");
System.loadLibrary("DLL_2");
Both of the DLL are loaded form same Java Application
But the problem is that , whenever i try to call the Notify Method , it calls the Notify method of DLL_1 only.
How do i call the Notify Methos of second DLL(i.e DLL_2).
Is there any reference that i can get to all the DLL files when i load then , so that i can use that reference to invoke the Notify method of that particular DLL.

i have two dll files named DLL_1.dll and DLL_2.dll .
Both of them contain a native method which has a
signature
JNIEXPORT void JNICALL Java_Database_Notify
(JNIEnv *, jclass);
This method is common to both the DLL
Now i load both of the DLL's using,
System.loadLibrary("DLL_1");
System.loadLibrary("DLL_2");
Both of the DLL are loaded form same Java
Application
But the problem is that , whenever i try to call the
Notify Method , it calls the Notify method of DLL_1
only.
How do i call the Notify Methos of second DLL(i.e
DLL_2).
Is there any reference that i can get to all the DLL
files when i load then , so that i can use that
reference to invoke the Notify method of that
particular DLL.You need to explain exactly what you are trying to achieve.
As per the description above it is impossible in java.
And I didn't say JNI, I said java.
Your above statement suggests that you think that you can have exactly the same java signature do two different things.
Note again that I said java not JNI.
A JNI method is just a tag that represents a java signature. Your description suggests that you are attempting to do it twice.
There are three possibilities.
1. Your explanation is incomplete.
2. You are trying to do something that is impossible in java.
3. You are trying to solve a problem and your description of your solution is not sufficient to determine what that is (and of course the solution is wrong.)

Urgent - How to call native methods from J2ME

Hi,
I have to do some very heavy processing work, so I have my code written in C. And now I want these native functions to be called from a J2ME application. I had thought this was not possible and J2ME did not support something like JNI as J2SE did.
However, when contacted with Sun Technical Support we were advised to use KNI in J2ME. I went through the KNI documentation and did not find any example to do so.
On reading about it I understood that it cannot be implemented by developers as the native functions if any using KNI should be implemented while compiling the KVM.
I would like to know whether my understanding is correct, or is it possible to call native functions from J2ME. Say I would like to have my native functions called from J2ME and run it on my Nokia N73 or other such phones.
Experts please clear this.
Regards,
Kamalakshan

Hi,
You are right in your assumptions regarding KNI. Here is some related thread that might also help. There has been [some work|http://developer.symbian.com/main/downloads/papers/MIDlet_Native_Services_Framework/MIDlet_Native_Services_Framework_v1.1.zip] done in accessing native services through a MIDlet.
Mihai

If my native method depends on other dll, how and where should place them?

I write a native method called A, and A needs to call some funciton in b.dll, c.dll,
then I generate the dll for A, and load in the java code, but how should I deal with b and c.dll
thanks

according to what you say, i just need to put the dlls which the native method depend on to the you mentioned location,right?
I tried but failed.
can you give me more idea?

Native Methods and Applets

Hi, I need to use data glove woth vrml.
To do so i use a java class that invoke native methods, because the glove's sdk are only for VC++, but i receive the security exception. I know that applets con't load native methods and i think that java classes loaded from vrml are considered like applets.
Anyone can tell me if is possible to change security policy, for example giving all permissions to applet, i'm not interested in security, the code work in local. Thanks to all this is for my thesis in VR.

Right. I understand. Here's what I've been able to find out:
1) As I thought, your script node Java class is being run by the Microsoft JVM. (Hence the com.ms.. exception.)
2) In order for the VM to run classes that use native code, you'll have to make your code trusted by:
- i) Asserting the permission required to run native code in your Java source, through a PolicyEngine.assertPermission method call. See http://support.microsoft.com/kb/q175622/
- ii) Package up the class in a Microsoft CAB file and sign the cab file. See http://support.microsoft.com/default.aspx?scid=kb;en-us;Q193877
Look at http://www.jguru.com/faq/view.jsp?EID=468498 first for an overview of both of these.
3) It seems that Cortona (as a non-standard extension) can use script classes in cab files (whether signed or not), so you might be in luck here. See http://forums.parallelgraphics.com/show/forum/general/messages/59/
You might need to get hold of the (now unsupported) Microsoft SDK for Java 4.0 in order to create and sign your CAB file. I found this at ftp://ftp.crystalpoint.com/updates/ovweb/sdkjava40.exe but I cannot vouch for this executable. Use at your own risk.
For the benefit of other readers, it seems that Cortona cannot be used with the Sun JRE, so the OP is out of luck there.
Let us know how you get on.
Alex

Connector.isNetworkMonitorActive(Native Method)... ?

Hi I'm doing this lines:
import javax.microedition.io.*;
import java.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class Server
     public static void main( String[] args )
          try
          // Create the server listening socket for port 8787
               ServerSocketConnection scn = (ServerSocketConnection)
          Connector.open("socket://:8787");
and get followint exception:
xception in thread "main" java.lang.UnsatisfiedLinkError: isNetworkMonitorActive
at javax.microedition.io.Connector.isNetworkMonitorActive(Native Method)
at javax.microedition.io.Connector.<clinit>(Connector.java:142)
at Server.main(Server.java:18)
Pleased for suggestions
I'm running windows.

OK.
Actualy it work when I run J2ME - KToolbar.
How do I to import the needed "stuff". I'm using JCreator
Thanks

J2me and java card, need help to communicate

we are trying to put together a reader to read smartcards using j2me and we figure that it would be easiest if we could develop it to work with java cards rather than standard smart cards, the problem is we get garbage when we communicate to it, the chip sends us crap, any suggestions what might be wrong, any calls we might be missing, has anyone worked with j2me and java cards or smart cards, any help would be appreciated.
einar

.... reader app and the ME behind it .... smells like mobile ....
First of all - if you want to have one mobile application running on this just make sure that whatever is written in ME can use drivers from the reader chip ....
Workin on the PC is something completely different. There was one good example how to develop one host application in Java provided with the JCOP tools long ago ... I don't know if this is now in the new Eclipse tools.
But - there was a small API provided that can give you good hints what to do - and - once you have it on the reader side - you can easily integrate ME methods with this ...

How to view the source code for a Native Method

hi
i am using a Native method Math.pow() ;
but since it is a native method it is taking more time to execute ;
since this method i had to call at least 700 times it is affecting the performance of the application ;
so i am thinking to write the user defined method based on the logic which has been implemented in the pow() method ;
for that i need to know in which .c file this method has been written ;
or else it can not be viewed at all ( if it is in the .dll)
can u help me out
nik

Hi!
Here is part of StrictMath.java code.
* The class <code>StrictMath</code> contains methods for performing basic
* numeric operations such as the elementary exponential, logarithm,
* square root, and trigonometric functions.
* <p>
* To help ensure portability of Java programs, the definitions of
* many of the numeric functions in this package require that they
* produce the same results as certain published algorithms. These
* algorithms are available from the well-known network library
* <code>netlib</code> as the package "Freely Distributable
* Math Library" (<code>fdlibm</code>). These algorithms, which
* are written in the C programming language, are then to be
* understood as executed with all floating-point operations
* following the rules of Java floating-point arithmetic.
* <p>
* The network library may be found on the World Wide Web at:
* <blockquote><pre>
* http://metalab.unc.edu/
* </pre></blockquote>
* <p>
* The Java math library is defined with respect to the version of
* <code>fdlibm</code> dated January 4, 1995. Where
* <code>fdlibm</code> provides more than one definition for a
* function (such as <code>acos</code>), use the "IEEE 754 core
* function" version (residing in a file whose name begins with
* the letter <code>e</code>).
* @author unascribed
* @version 1.9, 02/02/00
* @since 1.3

Returning several values from a C native method

Hi,
I need to return 3 values from a native methode : an int (the return code), a string of variable length and a double.
In pure C, my function would be defined as "int f ( char* s, double* d)", and I would "malloc" the string into the calling function, then copy my string to "s" and use "*d" to return the double...
Is there a way to do that with JNI? I found some examples where the native function returns only one parameterlike: "return(*env)->NewStringUTF(env, buffer);" But I didn't find examples where the native function returns several parameters, including a string.
Thanks in advance!
JM

This really has nothing to do with JNI.
You have a method, and you want to return more than one type of value.
The following solutions are possible.
1. Return an array that contains all the values (actual return value.)
2. Return an object that contains all the values (actual return value.)
3. Use an array via the parameter list and fill in a value.
4. Use an object via the parameter list and fill in the values.

EXCEPTION_ACCESS_VIOLATION while calling a native method.....

Hi guys,
i am trying to call a native method from my java code, but i am getting this following error,
# An unexpected error has been detected by HotSpot Virtual Machine:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x052bd55f, pid=2740, tid=3884
# Java VM: Java HotSpot(TM) Client VM (1.5.0_07-b03 mixed mode, sharing)
# Problematic frame:
# C [F3BC1ENG.DLL+0xd55f]
In the log file,
# An unexpected error has been detected by HotSpot Virtual Machine:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x052bd55f, pid=2740, tid=3884
# Java VM: Java HotSpot(TM) Client VM (1.5.0_07-b03 mixed mode, sharing)
# Problematic frame:
# C [F3BC1ENG.DLL+0xd55f]
--------------- T H R E A D ---------------
Current thread (0x03b26e50): JavaThread "httpWorkerThread-8080-0" daemon [_thread_in_native, id=3884]
siginfo: ExceptionCode=0xc0000005, reading address 0x05e71000
Registers:
EAX=0x31304443, EBX=0x05d048f0, ECX=0x0c4c0d16, EDX=0x05e70000
ESP=0x2c76ef38, EBP=0x2c76f034, ESI=0x05e71000, EDI=0x05d06d20
EIP=0x052bd55f, EFLAGS=0x00010213
Top of Stack: (sp=0x2c76ef38)
0x2c76ef38: 00000001 052a9264 2c76f228 052a92a4
0x2c76ef48: 01190002 00000000 00000000 00000000
0x2c76ef58: 00000000 ffffffff 00000002 05d05d38
0x2c76ef68: 00000000 00000000 00000000 00000000
0x2c76ef78: ffffffff 7c9106eb 00000004 00000000
0x2c76ef88: 00000000 00000000 00000000 00000000
0x2c76ef98: 00000000 00000000 00000000 00000000
0x2c76efa8: 00000000 052bf3e1 2c76efd4 0000101f
Instructions: (pc=0x052bd55f)
0x052bd54f: 00 8b 7c 24 2c 8b 4a 18 8d 72 18 8b c1 c1 e9 02
0x052bd55f: f3 a5 8b c8 eb 16 8b b4 24 bc 00 00 00 8b 7c 24
Stack: [0x2c670000,0x2c770000), sp=0x2c76ef38, free space=1019k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [F3BC1ENG.DLL+0xd55f]
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j palmsecuresdk.sample.PvsAuthenticationJNI.identifyMatch(I[BLjava/util/List;ILjava/util/List;)I+0
j packService.palmsImpl.identify([B)Ljava/lang/String;+55
j packService.palmsSEI_Tie.invoke_identify(Lcom/sun/xml/rpc/server/StreamingHandlerState;)V+50
j packService.palmsSEI_Tie.processingHook(Lcom/sun/xml/rpc/server/StreamingHandlerState;)V+58
j com.sun.xml.rpc.server.StreamingHandler.handle(Lcom/sun/xml/rpc/spi/runtime/SOAPMessageContext;)V+819
j com.sun.xml.rpc.server.http.JAXRPCServletDelegate.doPost(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+394
j com.sun.enterprise.webservice.JAXRPCServlet.doPost(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+139
j javax.servlet.http.HttpServlet.service(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+139
j javax.servlet.http.HttpServlet.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+30
j org.apache.catalina.core.ApplicationFilterChain.servletService(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/Servlet;Lorg/apache/catalina/util/InstanceSupport;)V+93
j org.apache.catalina.core.StandardWrapperValve.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)I+644
j org.apache.catalina.core.StandardPipeline.doInvoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+77
j org.apache.catalina.core.StandardPipeline.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+3
j org.apache.catalina.core.StandardContextValve.invokeInternal(Lorg/apache/catalina/Wrapper;Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)I+238
j org.apache.catalina.core.StandardContextValve.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)I+252
j org.apache.catalina.core.StandardPipeline.doInvoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+77
j com.sun.enterprise.web.WebPipeline.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+53
j org.apache.catalina.core.StandardHostValve.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)I+89
j org.apache.catalina.core.StandardPipeline.doInvoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+77
j com.sun.enterprise.web.VirtualServerPipeline.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+149
j org.apache.catalina.core.ContainerBase.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+6
j org.apache.catalina.core.StandardEngineValve.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)I+58
j org.apache.catalina.core.StandardPipeline.doInvoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+77
j org.apache.catalina.core.StandardPipeline.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+3
j org.apache.catalina.core.ContainerBase.invoke(Lorg/apache/catalina/Request;Lorg/apache/catalina/Response;)V+6
j org.apache.coyote.tomcat5.CoyoteAdapter.service(Lorg/apache/coyote/Request;Lorg/apache/coyote/Response;)V+296
j com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter()V+19
j com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(Ljava/io/InputStream;Ljava/io/OutputStream;)Z+15
j com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(Ljava/io/InputStream;Ljava/io/OutputStream;)Z+25
j com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask()Z+74
j com.sun.enterprise.web.connector.grizzly.ReadTask.doTask()V+161
j com.sun.enterprise.web.connector.grizzly.TaskBase.run()V+1
j com.sun.enterprise.web.connector.grizzly.WorkerThread.run()V+22
v ~StubRoutines::call_stub
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x037aec00 JavaThread "AWT-Windows" daemon [_thread_in_native, id=2664]
0x0376bb10 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=4020]
0x03a526c0 JavaThread "Thread-25" daemon [_thread_blocked, id=2508]
0x03a3b8e8 JavaThread "Timer-5" daemon [_thread_blocked, id=2260]
0x03a51e18 JavaThread "Timer-4" [_thread_blocked, id=2192]
0x035bae38 JavaThread "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv].StandardHost[server].StandardContext[__JWSappclients]]" daemon [_thread_blocked, id=2548]
0x035fac10 JavaThread "httpWorkerThread-4848-1" daemon [_thread_blocked, id=3492]
0x03786530 JavaThread "httpWorkerThread-4848-0" daemon [_thread_blocked, id=1952]
0x035fa9e8 JavaThread "SelectorThread-4848" [_thread_in_native, id=408]
0x03576828 JavaThread "httpWorkerThread-8181-1" daemon [_thread_blocked, id=1964]
0x0356ee10 JavaThread "httpWorkerThread-8181-0" daemon [_thread_blocked, id=3476]
0x00c29278 JavaThread "SelectorThread-8181" [_thread_in_native, id=3512]
0x03acb208 JavaThread "httpWorkerThread-8080-1" daemon [_thread_blocked, id=3472]
=>0x03b26e50 JavaThread "httpWorkerThread-8080-0" daemon [_thread_in_native, id=3884]
0x03bea780 JavaThread "SelectorThread-8080" [_thread_in_native, id=1500]
0x03606198 JavaThread "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv]]" daemon [_thread_blocked, id=3788]
0x03b57620 JavaThread "SingleSignOnExpiration" daemon [_thread_blocked, id=3528]
0x03b5fb58 JavaThread "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv].StandardHost[server].StandardContext[]]" daemon [_thread_blocked, id=3480]
0x03c03d58 JavaThread "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv].StandardHost[server].StandardContext[newPalmService]]" daemon [_thread_blocked, id=3524]
0x03629bf0 JavaThread "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv].StandardHost[server].StandardContext[palmSecure_ws]]" daemon [_thread_blocked, id=3560]
0x03acbee8 JavaThread "SingleSignOnExpiration" daemon [_thread_blocked, id=2308]
0x0374f418 JavaThread "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv].StandardHost[__asadmin].StandardContext[]]" daemon [_thread_blocked, id=2708]
0x03601a88 JavaThread "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv].StandardHost[__asadmin].StandardContext[web1]]" daemon [_thread_blocked, id=2284]
0x03b4e748 JavaThread "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv].StandardHost[__asadmin].StandardContext[asadmin]]" daemon [_thread_blocked, id=680]
0x037e4ac8 JavaThread "Timer-3" [_thread_blocked, id=2100]
0x03a97b08 JavaThread "RMI RenewClean-[192.168.10.19:1464]" daemon [_thread_blocked, id=2080]
0x037a7f38 JavaThread "RMI TCP Accept-0" daemon [_thread_in_native, id=1580]
0x03a4a050 JavaThread "RMI TCP Accept-8686" daemon [_thread_in_native, id=1316]
0x0379ccd0 JavaThread "Thread-15" [_thread_blocked, id=316]
0x03771d20 JavaThread "Thread-14" [_thread_blocked, id=228]
0x0376bcf0 JavaThread "Thread-13" [_thread_blocked, id=436]
0x0373d2a8 JavaThread "RMI LeaseChecker" daemon [_thread_blocked, id=904]
0x0373aa68 JavaThread "RMI RenewClean-[192.168.10.19:1429,com.sun.enterprise.admin.server.core.channel.LocalRMIClientSocketFactory@ac4d3b]" daemon [_thread_blocked, id=2320]
0x00c66dd0 JavaThread "Timer-2" daemon [_thread_blocked, id=1512]
0x038e3350 JavaThread "Timer-1" [_thread_blocked, id=2272]
0x03a4ac60 JavaThread "Thread-10" [_thread_in_native, id=4052]
0x03a6fc88 JavaThread "Thread-8" [_thread_in_native, id=1052]
0x03a43818 JavaThread "Thread-7" [_thread_in_native, id=2600]
0x03a1e808 JavaThread "Thread-6" [_thread_in_native, id=1648]
0x03a1ac20 JavaThread "GC Daemon" daemon [_thread_blocked, id=4084]
0x03a52e18 JavaThread "RMI Reaper" [_thread_blocked, id=144]
0x03a52c30 JavaThread "Timer-0" daemon [_thread_blocked, id=208]
0x03a3d730 JavaThread "RMI TCP Accept-0" daemon [_thread_in_native, id=2044]
0x00c17020 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=3456]
0x00c15bf0 JavaThread "CompilerThread0" daemon [_thread_blocked, id=4064]
0x00c14ed8 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=4060]
0x00c0fd90 JavaThread "Finalizer" daemon [_thread_blocked, id=4044]
0x00c0e8c0 JavaThread "Reference Handler" daemon [_thread_blocked, id=2436]
0x0032df88 JavaThread "main" [_thread_blocked, id=1532]
Other Threads:
0x00bdc778 VMThread [id=4028]
0x00c31a20 WatcherThread [id=4068]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation total 11712K, used 4051K [0x06a70000, 0x07720000, 0x11510000)
eden space 10432K, 27% used [0x06a70000, 0x06d435b0, 0x074a0000)
from space 1280K, 90% used [0x075e0000, 0x077017d8, 0x07720000)
to space 1280K, 0% used [0x074a0000, 0x074a0000, 0x075e0000)
tenured generation total 25784K, used 15468K [0x11510000, 0x12e3e000, 0x26a70000)
the space 25784K, 59% used [0x11510000, 0x1242b290, 0x1242b400, 0x12e3e000)
compacting perm gen total 26880K, used 26785K [0x26a70000, 0x284b0000, 0x2aa70000)
the space 26880K, 99% used [0x26a70000, 0x28498618, 0x28498800, 0x284b0000)
ro space 8192K, 67% used [0x2aa70000, 0x2afcd9f8, 0x2afcda00, 0x2b270000)
rw space 12288K, 46% used [0x2b270000, 0x2b813808, 0x2b813a00, 0x2be70000)
Dynamic libraries:
0x00400000 - 0x00406000      D:\Sun\AppServer\lib\appserv.exe
0x7c900000 - 0x7c9b0000      C:\WINDOWS\system32\ntdll.dll
0x7c800000 - 0x7c8f4000      C:\WINDOWS\system32\kernel32.dll
0x77c10000 - 0x77c68000      C:\WINDOWS\system32\MSVCRT.dll
0x6d730000 - 0x6d8c7000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\client\jvm.dll
0x77d40000 - 0x77dd0000      C:\WINDOWS\system32\USER32.dll
0x77f10000 - 0x77f56000      C:\WINDOWS\system32\GDI32.dll
0x77dd0000 - 0x77e6b000      C:\WINDOWS\system32\ADVAPI32.dll
0x77e70000 - 0x77f01000      C:\WINDOWS\system32\RPCRT4.dll
0x76b40000 - 0x76b6d000      C:\WINDOWS\system32\WINMM.dll
0x6d2f0000 - 0x6d2f8000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\hpi.dll
0x76bf0000 - 0x76bfb000      C:\WINDOWS\system32\PSAPI.DLL
0x00a10000 - 0x00a27000      C:\Program Files\Common Files\Logishrd\LVMVFM\LVPrcInj.dll
0x6d700000 - 0x6d70c000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\verify.dll
0x6d370000 - 0x6d38d000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\java.dll
0x6d720000 - 0x6d72f000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\zip.dll
0x6d530000 - 0x6d543000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\net.dll
0x71ab0000 - 0x71ac7000      C:\WINDOWS\system32\WS2_32.dll
0x71aa0000 - 0x71aa8000      C:\WINDOWS\system32\WS2HELP.dll
0x71a50000 - 0x71a8f000      C:\WINDOWS\System32\mswsock.dll
0x76f20000 - 0x76f47000      C:\WINDOWS\system32\DNSAPI.dll
0x76fb0000 - 0x76fb8000      C:\WINDOWS\System32\winrnr.dll
0x76f60000 - 0x76f8c000      C:\WINDOWS\system32\WLDAP32.dll
0x76fc0000 - 0x76fc6000      C:\WINDOWS\system32\rasadhlp.dll
0x04220000 - 0x04248000      C:\WINDOWS\system32\rsaenh.dll
0x769c0000 - 0x76a73000      C:\WINDOWS\system32\USERENV.dll
0x5b860000 - 0x5b8b4000      C:\WINDOWS\system32\netapi32.dll
0x6d550000 - 0x6d559000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\nio.dll
0x662b0000 - 0x66308000      C:\WINDOWS\system32\hnetcfg.dll
0x71a90000 - 0x71a98000      C:\WINDOWS\System32\wshtcpip.dll
0x6d520000 - 0x6d528000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\management.dll
0x6d670000 - 0x6d676000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\rmi.dll
0x6d070000 - 0x6d1d7000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\awt.dll
0x73000000 - 0x73026000      C:\WINDOWS\system32\WINSPOOL.DRV
0x76390000 - 0x763ad000      C:\WINDOWS\system32\IMM32.dll
0x774e0000 - 0x7761c000      C:\WINDOWS\system32\ole32.dll
0x73760000 - 0x737a9000      C:\WINDOWS\system32\ddraw.dll
0x73bc0000 - 0x73bc6000      C:\WINDOWS\system32\DCIMAN32.dll
0x73940000 - 0x73a10000      C:\WINDOWS\system32\D3DIM700.DLL
0x6d2b0000 - 0x6d2ef000      C:\Program Files\Java\jdk1.5.0_07\jre\bin\fontmanager.dll
0x7c9c0000 - 0x7d1d4000      C:\WINDOWS\system32\shell32.dll
0x77f60000 - 0x77fd6000      C:\WINDOWS\system32\SHLWAPI.dll
0x773d0000 - 0x774d2000      C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2180_x-ww_a84f1ff9\comctl32.dll
0x5d090000 - 0x5d127000      C:\WINDOWS\system32\comctl32.dll
0x05290000 - 0x0529a000      C:\WINDOWS\system32\PvsApiJv.dll
0x052a0000 - 0x052ac000      D:\Java Project\PalmSecure\src\dll\PvFw.dll
0x052b0000 - 0x052dc000      D:\Java Project\PalmSecure\src\dll\F3BC1ENG.DLL
0x052e0000 - 0x0531f000      D:\Java Project\PalmSecure\src\dll\F3BC4CAP.DLL
0x05320000 - 0x05344000      D:\Java Project\PalmSecure\src\dll\F3BC4COM.DLL
0x73dd0000 - 0x73ece000      C:\WINDOWS\system32\MFC42.DLL
0x05c50000 - 0x05cf7000      D:\Java Project\PalmSecure\src\dll\F3BC4MAT.DLL
VM Arguments:
jvm_args: -client -Xmx512m -XX:NewRatio=2 -Dcom.sun.aas.defaultLogFile=D:/Sun/AppServer/domains/domain1/logs/server.log -Djava.endorsed.dirs=D:/Sun/AppServer/lib/endorsed -Djava.security.policy=D:/Sun/AppServer/domains/domain1/config/server.policy -Djava.security.auth.login.config=D:/Sun/AppServer/domains/domain1/config/login.conf -Dsun.rmi.dgc.server.gcInterval=3600000 -Dsun.rmi.dgc.client.gcInterval=3600000 -Djavax.net.ssl.keyStore=D:/Sun/AppServer/domains/domain1/config/keystore.jks -Djavax.net.ssl.trustStore=D:/Sun/AppServer/domains/domain1/config/cacerts.jks -Djava.ext.dirs=C:/Program Files/Java/jdk1.5.0_07/jre/lib/ext;D:/Sun/AppServer/domains/domain1/lib/ext;D:/Sun/AppServer/javadb/lib -Djdbc.drivers=org.apache.derby.jdbc.ClientDriver -Djavax.management.builder.initial=com.sun.enterprise.admin.server.core.jmx.AppServerMBeanServerBuilder -Dcom.sun.enterprise.config.config_environment_factory_class=com.sun.enterprise.config.serverbeans.AppserverConfigEnvironmentFactory -Dcom.sun.enterprise.taglibs=appserv-jstl.jar,jsf-impl.jar -Dcom.sun.enterprise.taglisteners=jsf-impl.jar -Dcom.sun.aas.classloader.optionalOverrideableChain=appserv-ws.jar,commons-logging.jar,commons-launcher.jar -Dcom.sun.aas.classloader.appserverChainJars=admin-cli.jar,admin-cli-ee.jar,dbschema.jar,j2ee-svc.jar -Dcom.sun.aas.classloader.serverClassPath.ee=%HADB_HOME%/lib/hadbjdbc4.jar,D:/Sun/AppServer/lib/SUNWjdmk/5.1/lib/jdmkrt.jar,%HADB_HOME%/lib/dbstate.jar,%HADB_HOME%/lib/hadbm.jar,%HADB_HOME%/lib/hadbmgt.jar,D:/Sun/AppServer/lib/SUNWmfwk/lib/mfwk_instrum_tk.jar -Dcom.sun.aas.configName=server-config -Ddomain.name=domain1 -Djmx.invoke.getters=true -Dcom.sun.aas.promptForIdentity=true -Dcom.sun.aas.classloader.optionalOverrideableChain.ee= -Dcom.sun.aas.instanceRoot=D:/Sun/AppServer/domains/domain1 -Dcom.sun.aas.domainName=domain1 -Dcom.sun.aas.classloader.sharedChainJars=javaee.jar,C:/Program Files/Java/jdk1.5.0_07/lib/tools.jar,install/applications/jmsra/imqjmsra.jar,commons-launcher.jar
java_command: <unknown>
Launcher Type: generic
Environment Variables:
JAVA_HOME=C:\Program Files\Java\jdk1.5.0_07
CLASSPATH=C:\PROGRA~1\JMF21~1.1E\lib\sound.jar;C:\PROGRA~1\JMF21~1.1E\lib\jmf.jar;C:\PROGRA~1\JMF21~1.1E\lib;C:\Program Files\Java\jdk1.5.0_07\jre\lib;.
PATH=C:/Program Files/Java/jdk1.5.0_07\jre\bin\client;D:\Sun\AppServer\lib;D:\Sun\AppServer\lib;C:\Program Files\Java\jdk1.5.0_07\bin;.;C:\WINDOWS\system32;C:\WINDOWS;D:\Sun\AppServer\lib;D:\Sun\AppServer\bin;D:\Sun\AppServer\lib;D:\Sun\AppServer\bin;C:\Sun\share\lib;C:\Sun\share\bin;C:\PROGRA~1\Java\JDK15~2.0_0\bin;C:\Sun\MessageQueue\lib;C:\Sun\MessageQueue\bin;c:\oracledb\product\10.2.0\db_2\bin;D:\oracle\product\10.2.0\db_1\bin;c:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\wamp\php;C:\wamp\Apache\GnuWin32\bin;d:\Program Files\Microsoft SQL Server\90\Tools\binn\;D:\Java Project\PalmSecure\src\dll;D:\Java Project\PalmSecure\src\Lib;.;D:\Sun\AppServer\bin;;C:\Sun\AppServer;C:\Program Files\Java\jdk1.5.0_07\bin;C:\Program Files\Cvsnt;C:\Program Files\CVSNT\;D:\Java Project\PalmSecure\src\dll;D:\Java Project\PalmSecure\src\Lib;
USERNAME=subbu.chandrasekaran
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 15 Model 44 Stepping 2, AuthenticAMD
--------------- S Y S T E M ---------------
OS: Windows XP Build 2600 Service Pack 2
CPU:total 1 family 47, cmov, cx8, fxsr, mmx, sse, sse2
Memory: 4k page, physical 457904k(42684k free), swap 3464136k(2905608k free)
vm_info: Java HotSpot(TM) Client VM (1.5.0_07-b03) for windows-x86, built on May 3 2006 01:04:38 by "java_re" with MS VC++ 6.0
what is the reason for this one....?
In my case, whenever the user has clicked the Identify button then the native method Identify should be called. That time it's working fine.
But once the user has clicked the Enroll button, then first the Identify native method should be called, based upon the result, the enroll() native method will be called. I am getting the error whenever i am clicking the Enroll button.
while clicking the Identify button i didn't get any such error....
What would be the reason?
someone pls clear my doubt.
--Subbu

You have a bug in your C code, and are attempting to access memory location 0.
Look for an unitialized pointer.

Accessing a native method from within a packaged class

I have seen some very useful information from RPaul. However, I can not quite get it to work.
I have a class "JNIGetUserId" that is in a package "com.services.localoptions". I am trying to call a native method from a dll. it works fine at the default package level. But not in the package. I have tried adding the "_" between each level of the directory in the h and c++ files. I also found that doing a javah at the top of the package structure it includes some information in the h file. A "_0005" shows up between each level.
This is on Windows XP. I am also using VisualAge for Java. I also am using JDK 1.3.1.
The source files:
package com.services.localoptions;
* This class provides the JNI Interface to call the
* AD User Maintainence routines.
* These routines are stored in the JNIGetUserIdLibrary.dll.
* The routines are:
* <ul>
* <li>getUser - returns a string containing the User Id
* <eul>
* @author: Ray Rowehl
* @date (10/15/2003 10:30:59 AM)
public class JNIGetUserId
     // Load the library
     static
     try
          System.out.println("loading dll");
     System.loadLibrary("JNIGetUserIdLibrary");
     System.out.println("loaded dll");
     catch (UnsatisfiedLinkError ue)
          System.out.println("Link Error");
* native C++ method to call getUserId routine
public native String getUser() throws Exception;
* This method allows us to test standalone..
* Creation date: (10/16/2003 2:08:58 PM)
* @param args java.lang.String[]
public static void main(String[] args)
     try
          System.out.println("Trying method 3");
          JNIGetUserId lGUD = new JNIGetUserId();
          System.out.println(lGUD.getUser());
     catch (Exception e)
          System.out.println("Got an exception " + e);
          e.printStackTrace();
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class JNIGetUserId */
#ifndef IncludedJNIGetUserId
#define IncludedJNIGetUserId
#ifdef __cplusplus
extern "C" {
#endif
* Class: JNIGetUserId
* Method: getUser
* Signature: ()Ljava/lang/String;
JNIEXPORT jstring JNICALL Java_com_localoptions_JNIGetUserId_getUser
(JNIEnv *, jobject);
#ifdef __cplusplus
#endif
#endif
// Implements method to return a string to Java
// C++ core header
#include <iostream.h>
// header from Java Interface
#include "JNIGetUserId.h"
#include "JNIGetUserId2.h"
// returns a string back to Java for package structure
JNIEXPORT jstring JNICALL Java_com_services_localoptions_JNIGetUserId_getUser
( JNIEnv * env, jobject thisObject )
     // set up constant user id for testing return
     char* userid = "RROWEHLP";
     // return userid to caller
     return env->NewStringUTF( userid );
// returns a string back to Java for flat structure
JNIEXPORT jstring JNICALL Java_JNIGetUserId_getUser
( JNIEnv * env1, jobject thisObject1 )
     // set up constant user id for testing return
     char* userid1 = "RROWEHL1";
     // return userid to caller
     return env1->NewStringUTF( userid1 );
}

Ok. A co-worker figured it out for me. The key thing is to do "javah com.services.localoptions.JNIGetUserId". Note the use of "." instead of "\". Running on windows, I was used to doing "\". That was part of the problem. Another key is doing the javah at the top of the package structure. This was mentioned in a post over at IBM.
We got our JNI stuff working now. thanks, ray.

What's wrong about native method?

when I call c navtive method under the Solorais 8 and JDK 1.4.2.
what's wrong?why??
Unexpected Signal : 11 occurred at PC=0xFE0EEA28
Function=[Unknown. Nearest: JVM_IsSupportedJNIVersion+0x988]
Library=/usr/j2sdk1.4.2/jre/lib/sparc/client/libjvm.so
Current Java thread:
at jp.co.dir.am.faimsam.G02F_NativeJniPrt.JNI_BG_trsMrktName(Native Method)
at jp.co.dir.am.faimsam.print.core.creater.G02IF007.exeSimple(G02IF007.java:70)
at jp.co.dir.am.faimsam.print.core.controller.PrintGenerator.process(Unknown Source)
at jp.co.dir.am.faimsam.print.core.controller.Handler.handlePrint(Unknown Source)
at jp.co.dir.am.faimsam.print.web.WebWorker.run(Unknown Source)
at java.lang.Thread.run(Thread.java:534)
Dynamic libraries:
0x10000 java
0xff350000 /usr/lib/libthread.so.1
0xff390000 /usr/lib/libdl.so.1
0xff200000 /usr/lib/libc.so.1
0xff330000 /usr/platform/SUNW,Ultra-4/lib/libc_psr.so.1
0xfe000000 /usr/j2sdk1.4.2/jre/lib/sparc/client/libjvm.so
0xff2e0000 /usr/lib/libCrun.so.1
0xff1e0000 /usr/lib/libsocket.so.1
0xff100000 /usr/lib/libnsl.so.1
0xff0d0000 /usr/lib/libm.so.1
0xff1c0000 /usr/lib/libsched.so.1
0xff310000 /usr/lib/libw.so.1
0xff0a0000 /usr/lib/libmp.so.2
0xff040000 /usr/j2sdk1.4.2/jre/lib/sparc/native_threads/libhpi.so
0xfe7d0000 /usr/j2sdk1.4.2/jre/lib/sparc/libverify.so
0xfe790000 /usr/j2sdk1.4.2/jre/lib/sparc/libjava.so
0xfe760000 /usr/j2sdk1.4.2/jre/lib/sparc/libzip.so
0xfe490000 /usr/lib/locale/ja/ja.so.2
0xfe590000 /usr/lib/locale/ja/methods_ja.so.2
0xfddb0000 /usr/j2sdk1.4.2/jre/lib/sparc/libnet.so
0xfdd90000 /usr/j2sdk1.4.2/jre/lib/sparc/libnio.so
0xfc3d0000 /usr/lib/librt.so.1
0xfc3b0000 /usr/lib/libaio.so.1
0xfc390000 /usr/lib/libsendfile.so.1
0xfc2c0000 /home1/fam/apl/print/lib/libG02JB.so
Heap at VM Abort:
Heap
def new generation total 2112K, used 244K [0xf1400000, 0xf1620000, 0xf1b10000)
eden space 2048K, 8% used [0xf1400000, 0xf142d138, 0xf1600000)
from space 64K, 100% used [0xf1610000, 0xf1620000, 0xf1620000)
to space 64K, 0% used [0xf1600000, 0xf1600000, 0xf1610000)
tenured generation total 1408K, used 326K [0xf1b10000, 0xf1c70000, 0xf5400000)
the space 1408K, 23% used [0xf1b10000, 0xf1b61a00, 0xf1b61a00, 0xf1c70000)
compacting perm gen total 4096K, used 2740K [0xf5400000, 0xf5800000, 0xf9400000)
the space 4096K, 66% used [0xf5400000, 0xf56ad168, 0xf56ad200, 0xf5800000)
Local Time = Tue Sep 9 15:25:56 2003
Elapsed Time = 14
# HotSpot Virtual Machine Error : 11
# Error ID : 4F530E43505002EF 01
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
# Java VM: Java HotSpot(TM) Client VM (1.4.2-b28 mixed mode)
# An error report file has been saved as hs_err_pid19029.log.
# Please refer to the file for further information.

I dont know if it actually helps, but following the link
http://www.cs.pub.ro/~gaburici/nstomcat/diss.html#solpre
there are some problems mentioned that still seem to be in Java for Linux/Unix.
Try to set
LD_PRELOAD=/usr/j2sdk1.4.2/jre/lib/sparc/client/libjvm.so
before you start the program.
(I assume you loaded the library via dlopen)
Hope it works...

How to view the source code for Native Method

hi
i am using some native methods in to my code ;
can anybody tell me how to view the source code for the same ;
nik

Buy/acquire a C/C++/assembly code disassembler and run the shared library through it.

J2ME and native methods

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