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List:       hpux-devtools
Subject:    RE: HPUX-DEVTOOLS: Problem loading shared library into java using jni on hpux 11.11
From:       "Donsbach, Jeff" <jeff.donsbach () hp ! com>
Date:       2007-09-06 15:54:40
Message-ID: 0E766B4D32E1BC4A877197B95A04A25A01A4D85D () tayexc14 ! americas ! cpqcorp ! net
[Download RAW message or body]

(Catching up on old messages)

Jean-Paul is exactly correct as you found out. To avoid the same type of
error in the future, if/when you port to HP-UX on Itanium, make sure
that you name your library with a ".so" extension instead of ".sl" (.so
is the convention used on Itanium). Otherwise, you will end up with the
same type of error message.

Hope this helps avoid future pain,
Jeff D
-- 
Jeff Donsbach
Partner Technology Access Center - MA	
HP Solution Alliances Engineering 

-----Original Message-----
From: owner-hpux-devtools@cxx.cup.hp.com
[mailto:owner-hpux-devtools@cxx.cup.hp.com] On Behalf Of Duhra, Sarab
Singh
Sent: Friday, August 31, 2007 12:52 PM
To: Marinier, Jean-Paul; hpux-devtools@cxx.cup.hp.com
Cc: Tzschenscher, Jo
Subject: RE: HPUX-DEVTOOLS: Problem loading shared library into java
using jni on hpux 11.11

Thanks Jean-Paul. Your suggestion fixed the problem.

Regards
-Sarab 

-----Original Message-----
From: Marinier, Jean-Paul
Sent: Friday, August 31, 2007 7:20 AM
To: hpux-devtools@cxx.cup.hp.com
Cc: Duhra, Sarab Singh; Tzschenscher, Jo
Subject: RE: HPUX-DEVTOOLS: Problem loading shared library into java
using jni on hpux 11.11


Hi,
 
>> System.loadLibrary("libperfdadv.sl");

a detail maybe overlooked: the official Java/Sun doc for
System.loadLibrary() mentions that the mapping between the Java level
library name and its system level name is "system-dependent".

On PA-RISC, it seems that a "lib" prefix gets magically added, and also
a ".sl" suffix. That is, the JVM actually tries to open library
"liblibperfdadv.sl.sl", and that fails of course.

You can check this by using "tusc" to trace the file access system calls
when your JVM runs.
Like this:

$ export SHLIB_PATH=.:/usr/lib
$ export JAVA_HOME=/opt/java1.5
$
$ uname -a
HP-UX ptac B.11.11 U 9000/800 1588720598 unlimited-user license $ $
$JAVA_HOME/bin/javac loadtest.java $ $ tusc -f -o tusc.log
$JAVA_HOME/bin/java loadtest
error: cannot load libperfdadv.sl
$
$ grep stat tusc.log | grep libperf
...
stat64("./liblibperfdadv.sl.sl", 0x7aff2870) ............. ERR#2 ENOENT
stat64("/usr/lib/liblibperfdadv.sl.sl", 0x7aff2870) ...... ERR#2 ENOENT
stat64("/usr/lib/liblibperfdadv.sl.sl", 0x7aff2870) ...... ERR#2 ENOENT
$ $ $ cat loadtest.java

class loadtest {

    public native static void initialize();
    public native static void sayHelloWorld();

public static void main(String args[])
{

    try {
        System.loadLibrary("libperfdadv.sl");
        System.out.println("Successfull library load");
    }
    catch (UnsatisfiedLinkError Err) {
        System.out.println("error: cannot load libperfdadv.sl");
        return;
    }

} // main() 

} // class


$


So could you please retry with: System.loadLibrary("perfdadv");


Best regards,

  Jean-Paul



-----Original Message-----
From: owner-hpux-devtools@cxx.cup.hp.com
[mailto:owner-hpux-devtools@cxx.cup.hp.com] On Behalf Of Duhra, Sarab
Singh
Sent: dijous, 30 / agost / 2007 21:09
To: hpux-devtools@cxx.cup.hp.com
Subject: HPUX-DEVTOOLS: Problem loading shared library into java using
jni on hpux 11.11

 Hi,
    I am using java1.5.0 on hpux 11.11.The java program loads a shared
library libperfdadv.sl using jni call -
System.loadLibrary("libperfdadv.sl"); Upon running the program
(SHLIB_PATH is set) , I get the following error:


Exception in thread "main" java.lang.UnsatisfiedLinkError: no
libperfdadv.sl in java.library.path
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1707)
        at java.lang.Runtime.loadLibrary0(Runtime.java:822)
        at java.lang.System.loadLibrary(System.java:992)
        at
com.hp.ov.perfd.businesslogic.Adviser.<clinit>(Adviser.java:6)


Here are more details about the system and the environment.



Uname -a
HP-UX hpcb B.11.11 U 9000/800 1848859676 unlimited-user license

Java -version
>/opt/java/bin/java -version
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build
1.5.0-_24_nov_2004_16_29) Java HotSpot(TM) Server VM (build 1.5.0 FCS
(JS B64) jinteg:11.24.04-15:51 PA2.0 (aCC_AP), mixed mode)


Chatr libperfdadv.sl
>chatr libperfdadv.sl
libperfdadv.sl:
         shared library
         shared library dynamic path search:
             SHLIB_PATH     enabled   second
             embedded path  disabled  first  Not Defined
         shared library list:
             dynamic   /home/ptc-nfs/chrisb/src/papi/libperfd.sl
         shared vtable support disabled
         explicit unloading enabled
         static branch prediction disabled
         executable from stack: D (default)
         kernel assisted branch prediction enabled
         lazy swap allocation disabled
         text segment locking disabled
         data segment locking disabled
         third quadrant private data space disabled
         fourth quadrant private data space disabled
         third quadrant global data space disabled
         data page size: D (default)
         instruction page size: D (default)
         nulptr references disabled
         shared library private mapping disabled

Command line for the java commnad
#!/bin/sh

export JAVA_HOME=/opt/java
export
CLASSPATH=/crm/gp/source/perfdadv/debug:/home/ptc-nfs/chrisb/src/papi
export SHLIB_PATH=$CLASSPATH

echo "SHLIB_PATH  is $SHLIB_PATH"
echo  "Run the jni adviser ...."

$JAVA_HOME/bin/java -Djava.library.path=$CLASSPATH  -classpath
$CLASSPATH com.hp.ov.perfd.businesslogic.Adviser

Here is the error on running the script:


Exception in thread "main" java.lang.UnsatisfiedLinkError: no
libperfdadv.sl in java.library.path
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1707)
        at java.lang.Runtime.loadLibrary0(Runtime.java:822)
        at java.lang.System.loadLibrary(System.java:992)
        at
com.hp.ov.perfd.businesslogic.Adviser.<clinit>(Adviser.java:6)



Regards
-Sarab

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