Hello,wie have an web-application which runs within a JRUN-Container. Sometimes it happens that the application is quite slow or does not respond any longer. I assume that this is caused by excessive Minor Garbage Collection. Usually Minor GC takes less than 50ms for our application, but when ...

I have a problem regarding Java and C++. I want to write a Java application that can display the livestream of PTZ cameras and network cameras. It currently works but the algorithm is not very efficient. I have written a C++ library (compiled with Visual Studio 2005) that writes the image data ...

Is there any way to control GC of jvm?

OS: Windows Server 2003 standard editionJVM: jdk1.5.0_11Xms=128MXmx=1024MGC Settings:-XX:PermSize=64M -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+DisableExplicitGCOne of the java solutions is running on Windows Server 2003.The physical memory size about is 2 GB.Only this ...

Hi everyone,I am trying to resolve this error exhaustively for the last 3 days.I have a 3rd Party DLL library which i am supposed to use from my Java Application. I compiled my own DLL that links(calls methods) the Java code and the the 3rd party DLLs. It works fine in my machine and 2 of my ...

Hello anybody,i'm actually researching the implementation of arithmetics in several programming languages.i checked the source and found the definitions of instructions like iadd or fadd incInterpreter_i486.inline.hpp(sparc version is the same)these definitions look like:inline jint ...

Hi there!!I'm trying to do a chat application based on serial connection. I've already installed the javax.comm api but when I run the application it throws this exceptions:Error loading SolarisSerial: java.lang.UnsatisfiedLinkError: no SolarisSerialParallel in java.library.pathCaught ...

Hi,I am loading .DLL file from the Runtime.loadLibrary method. I want to know list of methods/function call available in that library file.Is any class available in java for that ? Any help will be appriciated for me...Thanks In Advance.

Hello,Would appreciate any inputs.Setup :64 G HPUX machine - 16 processors-XX:ParallelGC specifiedNewRatio = 2-ms -mx 3.5 Gig -mn 1.5 G [ The New generation size ]Parallel GC Threads = 16The application reads a file and inserts data into a database.With 10 threads and 100 as the database commit ...

I get this error when trying to install Cisco Network Assistant Error in instructions. Invalid jvm file name specified in LAUNCH.Invalid variable specification. Line number (4)I have tried everything I can and need some expert help, it's driving me CRAZY haaaaaa.Cheers ...

public class HelloWorld{public native void sayHello();static{System.out.println(System.getProperty("java.library.path"));System.loadLibrary("HelloWorld");}public static void main(String [] args){HelloWorld helloWorld = new HelloWorld();helloWorld.sayHello();}}Here comes the error:Exception in ...

After having upgraded one of our servers to JBoss 4.0.5 GA and JDK 1.5.0_11-b03, we are experiencing a lot of JVM chrashes. With just a few hours interval we are getting SIGSEGVs and they all indicates a problematic frame somewhere inside libjvm.so:libjvm.so+0x1caa74 (9 ...

Dear All,Thanks in advance for your help. I am trying to access third party DLL file from Java first time. After going through the JNI tutorial I have done the following steps,1. Created a Java file with 'native'functions, which are available in DLL filepublic class ...

Does anybody know if there is a simple way for a java program to find out if a named service is installed on windows?We are using JavaService ( http://multiplan.co.uk/software/javaservice) to wrap a java program to run as a windows service and that works just fine. Now we have another java ...

Hi,I am trying to access a DLL file using JNative and i am able to call a method sucessfully, but when I try to call another method by same way it does not. Can i call 2 mehtods by creating instance of JNative? if I am accessing the methods in wrong way please correct me? Here is the code, ...

Is there an undocumented 'feature' in Java 6 that prevents loading the VM with JNI_VERSION_1_2?Using a loader that has worked since Java 1.3 and works fine with the most recent Java 5 (_11) version, I am now getting a JNI_EVERSION return code from the CreateJavaVM call on Java 6 on Windows ...

HiI ran my webapp on tomcat 5.0.28. After a while, I got an java.lang.OutOfMemoryError: PermGen space error when I tried to redeploy my application so I tried to redeploy again and still got errors. So I looked for some clues and found that setting Heap size or PermGen Size might help. I did ...

hi there...i want to display the output of a c program that uses, printf's, puts on a java gui. the c program has tones of these i dont want to edit them.i am using JNI to run c from java.does anybody know how i can capture the output of the c program and display iton a java ...

I have seen in other JNI code and on the forms here that use of long is the recomendation for pointers. However, when I use them with the C dll I'm wrapping I get compile warnings "warning: cast to pointer from integer of different size". The pointers are to a variety of C structs and there is ...

Hi,there is any way for propose an advancement of Java language?TIA

Hello,I need to get the running Windows processes using C++ and have a Process struct in C++ having 2 fields: name and pid. I want to pass an ArrayList of Process from C++ to Java. I have found an example of how to pass an array of objects from C++ to Java, but I'd like to pass an ArrayList, ...

Say I have a C function that will return a socket to the caller, like Socket* bbSocket()Can I map it to a JNI java API that return a java.net.Socket ?

how to write a jni wrapper to call an existing Dll created using C

If I specific a -Xmx value bigger than what VM can get, it will just refuse to start. How can I tell VM to use as much memory as system have?

Can you please let me know how to increase the JVM Heap Size -- on linux fedora 6.0.Thank you,

Hi. I'm doing some testes with JNI. Firs i followed the netbeans tutorial for doing a C programa that prints somthing for java.. like.. "Hello java from C". So i tried to load a dll from my dll. Like, I have this dll to use the parallel port on windows Xp. So i created a dll to access it an ...

Hi,this might very well be a C problem, but maybe not, because the program compiles fine and can nicely be executed seperately, it only crashes if used together with JNI. (Anyhow, I am not a C expert.)Okay, i am trying to make some third party C-code accessible from Java.The problem are lines ...

Hi all,I'm trying to run Jawin in Eclipse. Knowing that the program needs to find the file jawin.dll, I have added -Djava.library.path=c:\sources\jawin-2.0-alpha1\bin to the Arguments field in my run configurations.With this, I still get the error Exception in thread "main" ...

I have a server process that creates a thread which will exec a separate executable that runs a JNI method. The JNI method uses JDBC to connect to a database to do some work. After this thread ends, the server process creates another thread which does a file deletion and a file rename ...

Hello,I send a string (char *) from c++ to java as a inputargument for a method. This works great. But if the string consists of 1-3 character(s) it doesn't work ("Unhandled exception in...(JVM.dll)...Access violation.")Can anybody help?Thanks

Dear All,I am working on an application to monitor the state of a device. The device monitor part is written in c as native code. The java part of this application should be notified by the native part when there is something happens. The basic work flow is:Java: Call native function Init.C++ : ...

hi,I am trying to implement exception handling for a JAVA + C++ module.In which C++ exception is caught by a Java module.The c++ code is as follows,try{///////////===========} catch (Exception1 &e) {jclass clazz = ...

I have made a DLL to use within java, and it works fine when I use it on the machine that it was compiled on. However, when I take the DLL to a second machine, I get the following error when trying to use it in the SAME project, which is also a copy of the one in my PC. ...

Want to load a jfloat array into a java.nio.FloatBuffer in CThe easiest way to do this is using the static method FloatBuffer.wrap(float[]);So I get the classID:jclass floatBufClass = (*env)->FindClass(env, "java/nio/FloatBuffer");if(floatBufClass == NULL) {return (NULL);}This appears to ...

Hello,when installing Tomcat it asks to specify the "path of JVM" what shud b specified there ? already jdk1.5.0 is installed in the system.

Hi Guys I'm very inexperienced in debugging JNI/native lib, helps are very much appreicated. I've written C code to use a native library (.so) and also generate Java exception using the code below when making native method call via JNI, everything was running ok. However, I sometimes get ...

can someone help?# An unexpected error has been detected by HotSpot Virtual Machine:## Internal Error (4652414D450E43505003F3), pid=1784, tid=7548## Java VM: Java HotSpot(TM) Client VM (1.4.2_13-b06 mixed mode)# An error report file with more information is saved as ...

I've been poking around trying to find a way to get some heap usage statistics from inside a running 1.4.2 JVM. Basically what I need is:1. Notification that a GC event has occurred (or a way to tell that one has occurred since the last time the code checked).2. The sizes of the old (tenured) ...

Hi ! After a search on the forum, I request your help about a little JNI app developped to work with a 3D sensor. The research team in which I work use to working with Eclipse IDE, and this JNI appliation work on it. However, impossible to find a way on NetBeans... I get an exception : ...

the following simple code can't load jvm.dllat windows xp sp2 , jre-1_5_0_11#include <jni.h>#include <stdio.h>int main() {HINSTANCE hVM;if((hVM = LoadLibray("C:Program Files\\Java\\jre1.5.0_11\\bin\clienjvm.dll"))==NULL){printf("faild\n");}else printf("succes\n");return ...

Hi!! I m new to Java. I have developed an application in Java to call my VC++ Dll. I am successfully able to call the functions from DLL(VC++) and get their return values in Java application.(Using JNI)Now i want to pass an object of a class to the Java app. This to get the access to the data ...

Hello,I am using jakarta-tomcat-4.0.4.How can i determine which JVM is used in tomcat web server.Thanks.

Hi.I am new to JNI.I would want to know if it is legal and doable to create anon-primitive Java Object (e.g. Date Object) inside my native codeand hand it back to the JVM, in case of JNI...?An explanation with a reasoning would be great.Thanks

Hi,I have been working to get a program to compile on windows using cygwin. When I added the -mno-cygwin flag to the compile line things were moving smoothly until it hit a class that #included <list>. At this point it throws several errors about things not being declared. I have seen ...

I am new to JNI, this is a way i am tryig out.I defined java class as public class sample2struc{public String Myname;public void sample1struc() {};public void setMyname(String Myname){this.Myname = Myname;}public String getMyname(){return Myname;}}the c implementation JNIEXPORT jobject JNICALL ...

My application consists of a bunch of java classes (in a jar file) plus a large native library.How do I bundle these together and make it easy for the user to deploy and toset up the java.library.path to include this library location.I would like to put the native library into the jar file and ...

i calling main method using jni as follow (*env)->CallStaticVoidMethod(classsName, methodId, args);and it is work well can i get the CPU time of the main method

Ok so this is my last ditch attempt at trying to find a solution to this problem.I'm using JNI to access Java objects from my C++ code. It works fine, but we're adding some new methods that the Java programmer hasn't added yet to the JARS, so my c++ code is calling "GetMethodId" on methods ...

Hi,I need to write an app that read/write accesses memory on a Windows XP, outside the JVM. I am aware that this can not be done with java, and must be implemented with native calls from JNI.As I am not familiar with neither C or C++, I need some suggestions on a JNI example including dll, that ...

First question, is I have my JNI code split into separate header and c files reflecting the Java classes I'm using to call a 3rd party dll. Originally I tried to compile all of them on one commandline. This gave me a lot of "redefinition" errors or warnings. So now I am compiling each file ...