We have a java application that runs on AMD 64 bit Opteron Win 2003 SP1. It is configured with -Xmx = 8192M (64 bit JDK 1.5_08)The other JVM options are :-Xms4096m -Xmx8192m -XX:MaxPermSize=256m -Xmn1024m -XX:SurvivorRatio=1-XX:SoftRefLRUPolicyMSPerMB=1 -XX:+UseConcMarkSweepGC ...

When migrating an application from JDK1.4.2_12 to JDK1.5.0_10,it was seen that the max. heap size that was set using -Xmx had to be reduced from 1.5 GB to 1.3 GB on a win32 machine inorder to create JVM successfully. Any pointers to what in Java 5.0 could have brought about this change is ...

Hi,I am trying to create a JNI wrapper for my java application. I have reached the stage where I can launch the program, providing I have the path to jvm.dll in my path variable.I was wondering if there was any way to determine this path at runtime, seeming as it is highly unlikely anyone using ...

When viewing my website I get the above message. I click on ok, go into the site, but when changing pages I get the following "several java virtual machines running in the same process caused an error". On other computers there is no problem. The website was developed using Serif WebPlus 10 on ...

When we run applets belong to different pages, how many JVM will run in our OS.For example, there are two internet pages, each page embed one applet. When we use browser to access these pages simultaneously, how many JVM will run in our OS.Thanks!Alexander

Hi,How can i check that a particular type of object is live in JVMthanks in advance

If I run Java programs under Suse Linux 9.0 using JDK 1.5.0_09 for every started Java programm I can see 9 processes running under linux.It seems like one of them is the master and the others are child processes of this one.I've never seen this with other Linux / Java versions before. Could ...

hi all,I try this http://java.sun.com/docs/books/tutorial/native1.1/stepbystep/index.html for JNI. we need to write the native method implementation in such a way that the method signature should exactly match the method signature created in the header file.i want to provide interface to ...

hi,I am new to JNI and I need to know how could I get MS Access report data in my application. Specially, I am having difficulties in C coding part. I read API documentation and tutorials about JNI, so if you know where could I read about this topic send me that too.thanks

I am trying to call a Java jar application from my C code#include <jni.h>JavaVM *jvm;JNIEnv *env;JavaVmInitArgs vm_args;JavaVMOption jvm_options[4];jclass esmClientClass;int initJVM( char *classpath, char *libraryPath ){int result;char clsPath[256];char libPath[256];sprintf( clsPath, ...

HI,I'm trying to use a Java double array from within C based JNI code.double[] array = {1, 2, 3, 4}In the JNI code I am using:jboolean isCopy = JNI_TRUE;long* someArray = (long*)(*env) -> GetLongArrayElements (env, javaArray, &isCopy);printf("%i \n",someArray [0]);printf("%i ...

Okay i need to check if there is atleast one digit in a string.. how do i do that? Sorry im a noob!null

I wrote C++ code that creates a JVM and calls existing Java code.It compiles fine under VC++'s command linecompiler (cl.exe), but I'm having trouble making it compile and link under cygwin's g++.On my system, Java is installed in C:\Java\jdk1.5.0_10.CompilingHere is a typical compile from my ...

Hello, I have problems with JNI. I have method for solving large system of linear equations, written in C++. This is called within java via JNI. When I call this method with little system (say 2-3thousands of equations), I recieved correct result.When I call the method with higher number of ...

Hello,a have makefile with one target, which runs java program. all:java -Xmx2G -cp ./numerika_java/classes/ numeric.fem.vector.ElementVectorStaticWhen I run the program with -Xmx2G 'manually' from command linejava -Xmx2G -cp ./numerika_java/classes/ ...

Hi everyone,I would like to build the latest JDK (1.6) from sources on linux, but I'm experiencing this bug : http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6469784Apparently, I have to build hotspot with the precompiled headers. I googled a lot but didn't find anything about precompiled ...

Hello all,Please any one tell me How to make a project using JNI. If any one having any small project regarding JNI concept ,pls forward me.and PLs help me how to run the jni project.Thanx julu

Hello there,I am using the JNI to access a library written in c. And i just have two small questions.If i give my JNI method arguments such as a jint do i have to explicitly delete this in the c code?Ok now if my method in c code creates a jintArray do i have to explicitly delete this ...

I realize similiar questions have been asked elsewhere in the forums, but all the answers I'm seeing are "I think..." and "I would assume..." and things of this nature. I'm looking for a concrete answer from someone with a solid understanding of how the JVM works. The question is this: If an ...

I am attempting to create a jni library that contains a static link to another library. It compiles correctly and it works fine through any other language however when java attempts to load it I receive a Invalid access to memory location exception upon load. This happens with all jni libraries ...

Hi,I have been working on an application where I need to get data from a C++ object. Thus far I have had java call into the native code to extract it, but found that the design would be better to have C++ send the data to java when it deems appropriate. My problem is that now that I am having ...

Hi, all:It really surprised me that Java code runs much faster (at least for not so largeprogram) in Windows than in Linux.Recently I tested the speed of part of my learning package, whose task is toparse a 10MB (about 210,000 lines) text file to extrace some figures ,discretize them and put ...

Hi All,I'm developing an application which uses the JNI interface to embed theJVM to a C application. So my problem is, I would like to "map" some C structin the Java VM and that isn't a problem currently since I use the NewDirectByteBuffer() JNI call to allocate a ByteBuffer for a given ...

Hi,I wrote a Java GUI using JNI to interface a C++-library. On my primary system -Gentoo 64-bit with an Athlon64 processor- everything works fine. Actually, it should run on a Solaris system. As the C++ library is supposed to run on a 64-bit system, I installed the Java 64-bit edition on the ...

I am now working on a jni project and get the unsatisfiedlinkerror. But after I browse this forum, I do not get any useful information. my java code://package graphmining.cliquer;public class WClique {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method ...

hi,I am new to JNI and I am trying a simple HelloWorld project but I am getting the following exception :Exception in thread "main" java.lang.UnsatisfiedLinkError: displayHelloWorldat HelloWorld.displayHelloWorld(Native Method)at HelloWorld.main(HelloWorld.java) where comes my error ...

Hello,I have a problem with return a char[] from a java method to the native c++-code.The code looks like this://in java public static char[] draw( int j,int i){ char[] myc = new char[100]; ... return myc; }//in c++jmethodID mid;jchar jarr;mid = env->GetStaticMethodID(cls, "draw", ...

Hi,I am having a C Shared Library. This dll is an existing C application thats already developed, tested and produced. I don't have access to the source code. I can't write appropriate JNI functions. I want to call those C functions from JAVA. How can I do it?As I am beginner in JNI, a step ...

Hey all just another quick question,If i do something like the following in my C code do i have to explicitly free it to stop memory leaks?Here is an example of my code://Create a jintArrayjintArray = sally;int sally_size = 3;sally = (*env) -> NewIntArray(env, sally_size);//Populate my ...

Hi All,I am running a jni program, where my program will call a .c file. I see the .c file sets an array "int bit[10000]" and initializes it. I wonder whether this array will be kept in the memory after I called the .so file. Because I will call the .so file thousands of times, if the memory ...

Hi,I try to write the wrapper class for dll using J2Native. I have some problems while writting wrapper for the below dll function.USB_STATUSWINAPIUSB_Initialize(short nWidth, short nHeight, HWND hWnd);1. USB_STATUS 2. WINAPI3. HWNDHow i write the code in java for the above 3 ...

I apologize for being a bit naive. I have been given the task to come up with a framework where Jar files containing classes have to be compiled and loaded on demand.The jar files will contain code written by third party company. I have to come up with a solution where I load these class into ...

Hi,I am a fresher and new to java. I am doing load testing. When i hook up a profler into JVM and run a test for 10 mins with 10 virtual users, i see deadlocks and 200 transactions will be completed in this period.When i take out profiler and run the same test for 10 mins with 10 virtual users ...

Hello togehter!When I run my program I just get the following exception:## An unexpected error has been detected by HotSpot Virtual Machine:## EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x7c901010, pid=2820, tid=3180## Java VM: Java HotSpot(TM) Client VM (1.4.2_10-b03 mixed mode)# ...

Hi All,I have .dll file, which does encryption and decryption of a password.This dll was earlier used in .net to encrypt and decrypt the password.But now i am building the same application using J2ME, where i need to call this dll to encrypt and decrypt the password. Now i have already have an ...

Hi ,plz give me some suggetions for converting simple cpp program to dll and the code for wrapper class to integrate that with JAVA.Note: The application using the existing dlls only.

We have had a JASIG uPortal application running under Tomcat with JVM 1.5.0_05-b05 for over a year without any JVM crashes. But now, twice within the last 2 weeks, the JVM has crashed because it has run out of CodeBuffer space. There is a bug report on this (6487381), but the bug evaluation ...

I am seeing when eden is 100% and from space is 100% full before GC.After GC from space is only 10-15% full but and most of the objects is propagated to old space rather then allowing aging to happen in newspace.I have question about behavior which we seen today in on eour env.We are in ...

Sun's 1.5 JVM has some heap size configuration parameters that are not available in their 1.4 and earlier JVMs. For Sun's 1.5 JVM (not 1.4), there is the following documentation on sun's website: http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html#0.0.0.0.%20Heap%20Size%7CoutlineIf not ...

Hi guys,I have small test program in Java. When I run it by Sun's Java launcher, it shows both instances created and are the same (sun.misc.Launcher$AppClassLoader), the code:System.out.println("this.getClass.getClassLoader = " + ...

Suppose I have a function that:1. Takes an input string.2. Uses Java (via Invocation) to calculate a jstring.3. Converts the jstring to a a UTF string.4. Returns the UTF string.Like this (a JNIRef is a structure with references to classes and methods):char *f( JNIEnv *env, JNIRef *j, char ...

In different places, I've been reading different things about the specification of garbage collection in Java. From what I've found so far, it is pretty clear that if the garbage collector of the VM used decides to reclaim object X, then X.finalize() is called. However, opinions vary on ...

I have to use JNI in order to inherit a concrete class from an abstract one (java.util.TimerTask) and, then, instantiate it.I have to re-define the abstract method "run" of "TimerTask". In Java it's a trivial problem but I have to do it in C++!I hope I explained my problem. How do I work ...

Hello.Some JNI tools have been built to run on both windows and Solaris.For the windows part, The PATH has been modified to add the DLL in order to be able to load the library into the JVM.After some hard time to get the DLL build process doing his job, finally every thing worked.But in ...

hi alli searched net for passing string array from java to C but i dont get anything relevent i have class stu{ int rollnostring nameString [] sub} i want to pass all as String array from java to C and access it C side

I'd like to use Visual Basic to:1. Create a JVM.2. Create references to classes and methods.3. Call static and non-static methods.Is this possible? If so, how?Many thanks!

hi how can i Read The Title bar of any active window(like notepad ,mirosoft word ,internet explorer and so on......)who is runnningin windows Xpand close that window by java code

Hi,I am getting the following error when I execute the a particular query that returns 34 records. However, each row has lots of columns. If I reduce the number of rows or the number of columns the error goes away.I do not get this error on Windows XP, even when I don't reduce the number of ...

Folks,Can anyone point me at some information about the releationship between classpath length and jvm performance? Does a long classpath matter? Is there a maximum length?Many thanks,Miles

I have seen two options in various places, but I have not been able to understand the difference between the two. Can someone help me here+useconcmarksweepgc-useconcmarksweepgcWhy is there a + and also a -?