In amd64 linux JNI problem

CPU : AMD64 opeteron
O S : Redhat Enterprise 9 AS
JAVA: java-1.4.1-ibm-1.4.1.2-1jpp_2rh --> rpm
I`m on testing JNI in 64bit linux
it`s just HelloWorld program in this site jni tutorial
I succeeded same program in Solaris8 but in linux failed
In linux compiled with -fPIC and runed java
:gcc -shared -fPIC -I/usr/lib/jvm/java/include -o libhello.so HelloWorldImp.c
-->libhello.so created
-->libhello.so was listed LD_LIBRARY_PATH
:java HelloWorld
-->error occured
The java class could not be loaded. java.lang.UnsatisfiedLinkError: /data/test/jni3/libhello.so: /data/test/jni3/libhello.so: :g ; 4: =
java program can find .so but can`t load so file
why this happen? someone have idea? need help
sorry about my english

I think I will go read the release notes. Of java? Hmm, haven't looked there yet, but this is a just a fact of the biarch system.
I wonder if any of this mumbo jumbo is documented.I tried to find a link somewhere on the web but nothing too exciting. Believe me, I have an amd64 with both 32 bit and 64 bit applications. Both work excellently as long as the appropraite libraries are present. For instance, 32 bit mplayer (to use windows codecs) must link with 32 bit X11, glibc, gif, etc. This is also why most 64 bit users have a 32 bit browser - to use 32 bit flash and java plugin (there is no 64 bit version ATM) .This is also why you most likely (if you're on linux) have a /lib,/lib32, etc.

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- MySQL 6-alpha
My application actually connects to the database and starts executing the inserts successfully. It's just that at some point the memory gets filled up, pretty quickly actually. I've watched the through vmstat. The first one to fall is the free memory, then follows the cache memory. And then it starts filling up swap. When it reaches to 2GB of used swap the behavior differs with the Linux Distribution: Fedora Core 8 crashes horribly, in Oracle Enterprise Linux at some point my application's process goes to "sleep" and I seem to still be able to do other things.
To connect to the database I use the [OTLv4 library|otl.sourceforge.net]. One might think that my problem is with OTL, but I use the same OTL in all those cases, and unless it's an issue between Oracle in Linux and OTL I don't think it's an OTL issue.
Can anyone push me in some direction ?
Thanks.

Well, you seem to have a memory leak in your application, assuming nothing else is running. Check out the top(1) program; you can get it to sort the displayed processes according to how much %MEM (percent of memory) they are using. First entry is the culprit.
The best way I've found to locate a memory leak is to run your program using valgrind(1). This tool runs your application in a virtual CPU built in to valgrind(1). It can detect tons of different memory usage issues, from using an un-initialized variable to leaked memory.
Of course, you may not have a memory problem. Does you program generate huge bursts of I/O or is the I/O more evenly paced? Kernel I/O backlog can consume memory quickly. While your application is running, open two more windows. In one, run the command:
$ watch -n3 -d cat /proc/meminfo
and in the other:
$ watch -n3 -d cat /proc/slabinfo
Try to figure out what memory usage is steadily increasing; that can tell us if the app is leaking or the I/O channels just can't keep up.
Hope this gives you some ideas about how to proceed.

Linux font problem with LabVIEW 7 Express

Is there a change in how LabVIEW 7 Express for Linux
uses fonts? When I run LabVIEW 6.1 (on the same
machine) the standard font (10pt Application) looks
very nice (in menus, front panel and diagram). With
LabVIEW 7 they are not so good to read. What can I do?
Thanks in advance,
Armin Herzer

Hello Evan,
Sorry for the late replay, but I was on holiday last week.
I am using Debian GNU/Linux woody 3.0 (testing). The video driver is the one which is shipped with XFree86 in this Debian installation. I also used the newest video driver from NVidia but the problem is the same (btw. is this a NVidia problem? Unfortunally I can only test on machines with NVidia cards). I attached a screenshot to visualize the problem.
The problem is not VI specific. All text (menus, comments and so on) have this ugly font.
Thanks in advance,
Armin Herzer
FH Ravensburg-Weingarten
University of Applied Sciences
Attachments:
lv6170.png ‏15 KB

JNI problems (findclass and vm error)

Hi,
First please apologize if this question has already been asked. I've looked at the archives and I haven't found any answer to these problems. Thanks to take the time to read this quite long post, but I've tried to be sufficiently explicit...
So, here's what I want to do: in the native code, generate a list (ArrayList) with some integers in it. I must add that I'm not a Java expert.
Here's the java code calling the native function:
package be.ac.umrtc;
public class Main {
     public native List computeRoute(int src, int dst, float reservation)
     static{
          System.loadlibrary("cspf");
     public static void main(String[] args) throws Exception{
     List path = new Main().computeRoute(lsp.getFrom(),lsp.getTo(),lsp.getReservation());
Now the native code:
#include <jni.h>
#include "be_ac_umrtc_Main.h"
JNIEXPORT void JNICALL Java_be_ac_umrtc_Main_computeRoute(JNIEnv *env, jobject obj, jint src, jint dst, jfloat reservation){
     arraylistClass = (*env)->FindClass(env,"/java/util/ArrayList");
     if (arraylistClass == NULL){
          return NULL; // exception thrown
     cid = (*env)->GetMethodID(env,arraylistClass,"<init>","()V");
     if (cid == NULL){
          return NULL; // exception thrown
     arraylist = (*env)->NewObject(env, arraylistClass, cid);
     tempClass = (*env)->GetObjectClass(env,arraylist);
     jmethodID mid = (*env)->GetMethodID(env,tempClass,"add","(Ljava/lang/Object;)Z");
     while (longListPopBack(&computedroute,&value2)!=-1){
          fprintf(stderr,"Valeur de value: %d\n", value2);
          if (mid==0){
               return;
          fprintf(stderr,"%d\n", bool = (*env)->CallBooleanMethod(env, arraylist, mid, value2));
(*env)->DeleteLocalRef(env, arraylistClass);
return arrayList;
I get a NoClassDefFoundError on java/lang/ArrayList.
So, I've tried to pass a List object "path" as argument to the native method (created in java)
and proceed with:
arraylistClass = (*env)->GetObjectClass(env,path);
instead of FindClass.
It seems to work well, the first call to callBoleanMethod returns 1. But then, the next call in the loop ends in a VM ERROR:
HotSpot Internal Error, VM Error
# HotSpot Virtual Machine Error, Internal Error
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
# Java VM: Java HotSpot(TM) Client VM (1.4.2_03-b02 mixed mode)
# Error ID: 43113F32554E54494D45110E4350500308
# Problematic Thread: prio=1 tid=0x08052c30 nid=0x346d runnable
Heap at VM Abort:
Heap
def new generation total 576K, used 0K [0x44df0000, 0x44e90000, 0x452d0000)
eden space 512K, 0% used [0x44df0000, 0x44df02a8, 0x44e70000)
from space 64K, 0% used [0x44e80000, 0x44e80000, 0x44e90000)
to space 64K, 0% used [0x44e70000, 0x44e70000, 0x44e80000)
tenured generation total 3724K, used 2233K [0x452d0000, 0x45673000, 0x48df0000)
the space 3724K, 59% used [0x452d0000, 0x454fe540, 0x454fe600, 0x45673000)
compacting perm gen total 4096K, used 3166K [0x48df0000, 0x491f0000, 0x4cdf0000)
the space 4096K, 77% used [0x48df0000, 0x49107890, 0x49107a00, 0x491f0000)
Java Result: 129
The questions are thus:
1. why does FindClass not work?
2. why does the second call to callboleanmethod fails?
Thanks a lot for your help.
Olivier

Thanks, so now I just want to return an array of integers.
int[] computeRoute(...); in JAVA
JNIEXPORT jintArray JNICALL Java_be_ac_umrtc_Main_computeRoute(JNIEnv *env, jobject obj, jint src, jint dst, jfloat reservation){
int intarray[size];
return intarray;
does not work
I've tried casting : return (jintArray) intarray;
but no success
How can I create a jintArray? And then how to insert elements in this jintArray? I've seen in the books and the tutorial how to get element from such a jintArray passed as argument... but how to create it (how to fix size when creating it) and how to set elements is not evident to me.
Thanks for your patience.

Oracle 8i enterprise client linux installation problems

Hi,
I have a problem installing oracle 8i client on linux machine. It gives an error message when I tried to run runInstaller.
this is the error message:
Initializing JAva Virtual Machine from /usr/local/jre/bin/jre. Please Wait...
Error in CreateOUIProcess():-1
:Bad address
The machine is PII 450 with 128 mb of ram
Thanks,
Gurhan Gunduz
850-6447018

Gurhan,
I think it has nothing to do setting the JRE enviroment .from what I could remember is you have to install a JRE enviroment patch..
If you check you insallation documentation..
it tell you where to get the patch from..and I also think that you have to create symbolic link...
If you need more info on this..I could send you the URL..where you could get the patch..
send me an email..if you need futher assistance..I could then send you the url to get the patches from...
good luck.
shah

In amd64 linux JNI problem

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