Help: java.library.path and javah

Hello,
I have a little problem with my java.library.path!
I am working on a program which loads a dll in c++ that I have compiled
and will be used by a java program.
My java program consists of 2 Classes:
-- MonitorContainer.class creates an object; this object has an attribute which is a String type and it should be communicating with my dll: Diskid32.dll
-- This dll is loaded by another class : Diskid32.class with a known
and documented method: System.loadLibrary("Diskid32").
When all the following files(MonitorContainer.class, Diskid32.class, Diskid32.dll) are in the same folder, the program works fine
I need to put the Diskid32.dll and the Diskid32.class into a package! (package myutil.Disk)
I have two questions concerning the javah tool:
-- when I when I create the signatures with javah should I run:
------ javah Diskid32 or something else like
------ javah util.Disk.Diskid32 or ...
I have tried both of these and they produce header files which are different and both produce the same result in execution error
when I run my program and it's package
-- I tried to configure the java.library.path but still no go! When I launch java MonitorContainer I receive the following wrong message :
Exception in thread "main" java.lang.UnsatisfiedLinkError: no Diskid32 in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1344)
at java.lang.Runtime.loadLibrary0(Runtime.java:744)
at java.lang.System.loadLibrary(System.java:815)
at myutil.Disk.Diskid32.<clinit>(Diskid32.java:52)
at MonitorContainer.main(MonitorContainer.java:21)
My conclusion is that library path is not well configured
and the JVM is not finding my library diskid32.dll.
Thank for all...
Stephane

Hello,
I 've solve my problem: to set the library path You must write :
java -Djava.library.path=c:/xxx/yyy/zzz ; c:/xxx/yyy/zzz is the path to locate the Dll!
But the really problem was a forgetting in the c++ code, I have write a mistake in the line that references � class!
(jclass cls = env->FindClass(".../.../...");)
Thank for all

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Meaning of java.library.path and UnsatisfiedLinkError

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Library paths and environment variables

Hello,
I am using 10g AS 9.0.4 on a Unix system.
I am trying to convert an old JSP web application to work with 10g. It is not an EAR/WAR file so I am manually trying to set it up under the "default-web-app" folder. It uses a number of java class files which currently reside in $J2EE_HOME/default-web-app/WEB-INF/classes/mystuff.
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2. Why are the default library paths different on the server than to those specified in application.xml?
3. How do I change the LD_LIBRARY_PATH (or any environment variable for that matter)? I have tried adding the following line to $ORACLE_HOME/Apache/Jserv/etc/jserv.properties without success:
wrapper.env=LD_LIBRARY_PATH=/my/custom/library/path
Any help you can offer would be most appreciated.

>
Thanks very much for a such a comprehensive response
- it has helped answer a lot of questions, especially
being able to print out the system properties. That
will be really useful!
No worries at all Rob.
The main hurdle is that the libraries are indeed
native (*.so) libraries. I hadn't considered that
until you pointed it out in your message. Can I
assume, then, that $J2EE_HOME/applib and
$J2EE_HOME/default-web-app/WEB-INF/lib are only
designed to handle Java's .JAR librares? That would
explain why placing the native libraries in there
didn't work, but is there a way of getting such
native libraries recognised and bundled up in a
WAR/EAR file?
Yep, that's it.
Our proprietary applib and the servlet specs web-inf/lib are only dealing with Java archives.
The J2EE specs don't cover how to deal with native libs like this.
Now I've NEVER EVER tried it, but it's worth a shot of at least trying -- for simplified packaging purposes, what you may be able to do is to distribute the .so's within the web-inf/lib -- and then just set that directory (where's its realized on the server after the app is deployed) to be referenced witihn the LD_LIBRARY_PATH. I'd expect our deployment manager will just ignore files it doesn't know about, so arguably you should be able to at least distribute them with the standard archive.
You'll need to specifically set the LD_LIBRARY_PATH as a separate task outside of the deployment operation though.
>
This is where things get a bit weird, and is partly
my fault during the installation of 10g AS.
We already had an existing installation of Oracle 10g
Database (10.1.0) at $ORACLE_HOME under the user
"oracle". I logged in as the user "oracle" to install
the Application Server into a different location (In
this case, "$ORACLE_HOME/../ias10g_9.0.4" - let's
call this $IAS_HOME). So there is no separate user
account for Oracle Database and Application Server
(and hence no separate $LD_LIBRARY_PATH).
If I log into UNIX as the user "oracle" and echo the
LD_LIBRARY_PATH, I get the following directories:
$ORACLE_HOME/lib
/usr/openv/netbackup/bin
/usr/dt/lib
/usr/lib
I use this user to do "opmnctl stopall" and "opmnctl
startall". If I then print out the library path from
a JSP using
"System.getProperty("java.library.path");", I get the
following paths:
$IAS_HOME/jdk/jre/lib/sparc/server
$IAS_HOME/jdk/jre/lib/sparc
$IAS_HOME/jdk/jre/../lib/sparc
$IAS_HOME/opmn/lib
$IAS_HOME/lib
$IAS_HOME/usr/lib
Which is totally different to those listed by
$LD_LIBRARY_PATH at the command line, which means
they must be coming from somewhere else.
It gets worse - my application is trying to call a
native library that is only present in the
$ORACLE_HOME/lib32 directory (libclntsh.so.10.1), so
unless I can include this path in the
"java.library.path" on the Applicaiton Server, then
my program will not work.
So, how do I change the "java.library.path" when the
values aren't coming from $LD_LIBRARY_PATH in the
first place?
The utility $IAS_HOME/opmn/bin/opmnctl is actually a shell script.
It has this section which sets the LD_LIBRARY_PATH:
if [ -z "$LD_LIBRARY_PATH" ]
then
LD_LIBRARY_PATH=$ORACLE_HOME/opmn/lib:$ORACLE_HOME/lib ; export LD_LIBRARY_PATH
else LD_LIBRARY_PATH=$ORACLE_HOME/opmn/lib:$ORACLE_HOME/lib:${LD_LIBRARY_PATH} ; export LD_LIBRARY_PATH
fi
So if you have an existing LD_LIBRARY_PATH env var set, it should just be putting its paths onto the front of it.
What you could try as a quick test is to edit the opmnctl script (after taking a backup of course) and either appending the path you need to it, or just add some debug statements to output the LD_LIBRARY_PATH value it ends up setting so you can try and work out what's causing it.
I expect these other entries:
$IAS_HOME/jdk/jre/lib/sparc/server
$IAS_HOME/jdk/jre/lib/sparc
$IAS_HOME/jdk/jre/../lib/sparc
are coming from the JRE when it is launched, in probably a similar manner to our opmn entries.
I really appreciate your help, and I bet if anyone
can answer these questions, you can! ;-)
You're very welcome.
cheers
-steve-

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HELP: java.lang.UnsatisfiedLinkError: no ... in java.library.path

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Hi all,
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at ObjectSizeEstimator.main(ObjectSizeEstimator.java:25)
while executing the following code:
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static {
System.loadLibrary("instrument");
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Constructor ctor = InstrumentationImpl.class
.getDeclaredConstructor(new Class[] { long.class, boolean.class });
ctor.setAccessible(true);
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Thanks in advance....:)

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hi,
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But when I run the command:
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Hi, Ionut,
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Copyright (c) 1996-2008, Oracle. All rights reserved.
Type ? or "help" for help, type "exit" to quit ttIsql.
All commands must end with a semicolon character.
connect "DSN=mmdb_cs";
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/oracle/app/oracle/product/10.2.0/lib:/oracle/app/oracle/product/10.2.0/network/lib:/usr/lib:/usr/ccs/lib:/usr/local/lib:/itf1/ocstt/TimesTen/tt70/lib:/itf1/bea/tuxedo8.1/lib:/oracle/app/oracle/product/10.2.0/lib
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I wonder if there is a compatible problem between java6 and tt70.
Best regards,
Sunny
Edited by: user10914679 on 2010-1-27 上午3:47

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Hi all,
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Edited by: user2258172 on 4.6.2009 7:21

I am not familiar with Mac OS, but there are two things I can think of that you can check:
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Yours,
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I did look for this topic in this forum. The question has been asked, but I don't see an answer :(
I get an error at runtime...
"java.lang.UnsatisfiedLinkError: no EZTaxJavaCpp.dll in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)"
Code...
public class EZTaxJNI {
private native void sendEZCmd(String cmd);
static{
System.loadLibrary("EZTaxJavaCpp.dll");
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regarding the dll not found :
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three reasons I can think of :
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package com.hllapi;
in your code, then you need to state this in the native code like this
JNIEXPORT jstring JNICALL Java_com_hllapi_JRmmApi_runCommand (JNIEnv *env, jobject obj, jstring cmd)
- something in the header file is wrong ?
I usually have the 'extern "C" .....' statement in the header file,
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-> Java__EZTaxJNI_sendEZCmd(JNIEnv* env, jobject, jstring jMsg
this might be a problem
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hitting below error for : opatch lsinventory
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Can any one please help?
Regards
S

Hi Helio,
thanks for the response:
This is a unix specific issue. The most frequent reason for this is the liboraInstaller shared object file (liboraInstaller.so/sl) cannot be located at run time. The extension is ".so" for most systems, ".sl" for most other systems(usually HP) .
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Regards
S

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Hi,
I'm using Jdev 10.1.3, and my problem is the following one:
In my connection definition, that ORACLE_JDBC_TYPE is oci8 and when i try to conenct to BD, it occurs:
java.lang.UnsatisfiedLinkError: no ocijdbc10 in java.library.path
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I've drivers,jar, dll of client 10, becuase i supposse that it is that application need,
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Thanks.

I am not familiar with Mac OS, but there are two things I can think of that you can check:
- This is trivial, and you probably did that: ist libocijdbc10.dylib in /usr/local/oracle/instantclient10_1 ?
- Could it be that Java is 32-bit and libocijdbc10.dylib is 64-bit or vice versa?
Yours,
Laurenz Albe

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     <all-permissions/>
</security>
<application-desc main-class="ifsdTools.PopulateIFSDProjectForgeData" />
</jnlp>
=========================================================================================================
Edited by: 878645 on Apr 26, 2012 3:43 PM

Thanks for the pointer. Question that I have is I am referencing sqljdbc4.jar in my application, which in turn using sqljdbc_auth.dll.
Which one should i refernce through <nativelib>. Is it sqljdbc4.jar or sqljdbc_auth.dll.
have added the following line to the .jnlp.
<nativelib href="sqljdbc4.jar"/>
But still it is complaining on sqljdbc_audth.dll. If it is sqljdbc_auth.dll, can I use <nativelib> to pass it.
In that case does it need to be signed?. If so,
Is it possible to sign .dll using 'jarsigner'?.
Edited by: 878645 on Apr 26, 2012 3:43 PM

Java.lang.UnsatisfiedLinkError: no ocijdbc8 in java.library.path

hi,
i am trying to connect to an oracle 8.1.7 database from my application running on tomcat 4.0.3 / jdk1.4 /windows nt.
using the thin jdbc-driver (classes12.zip) everything works fine.
when i try using the oci8-driver, i get an error-message saying:
java.lang.UnsatisfiedLinkError: no ocijdbc8 in java.library.path
i have the oracle-client installed on my machine.
the ocijdbc8.dll can be found in D:\server\oracla81\bin
the environment-variables PATH, CLASSPATH, LD_LIBRARY_PATH (i'm not sure if this has any meaning on nt) all point to this directory.
i start tomcat using the following option: -Djava.library.path="D:\server\oracla81\bin"
my application can see this variable:
System.out.println("java.library.path: "+System.getProperty("java.library.path"));
prints out the correct value.
then i try to load the library by myself:
try {
System.loadLibrary("ocijdbc8");
System.out.println("Successfully Loaded");
} catch(Exception e) {
System.out.println("LD_LIBRARY_PATH is not properly set");
e.printStackTrace();
everything works fine! the library is loaded!
finally i try to connect to the database and the application throws the mentioned exception:
lang.UnsatisfiedLinkError: no ocijdbc8 in java.library.path
     at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1410)
     at java.lang.Runtime.loadLibrary0(Runtime.java:772)
     at java.lang.System.loadLibrary(System.java:832)
     at oracle.jdbc.oci8.OCIDBAccess.logon(OCIDBAccess.java:228)
     at oracle.jdbc.driver.OracleConnection.(OracleConnection.java:249)
     at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:365)
     at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:260)
any help would be appreciated.
thanx in advance,
frank.
[email protected]

It is probably JDK 1.4 that causes the problem. I was able to get strange errors with that version of the JDK with code that worked fine using 1.31.

No ocijdbc10 in java.library.path - can not figure out

I am using Eclipse 3.2 and connecting to an Oracle 10g server. All of my projects were working just fine. BUT, I needed to move the java code and directories from one server to another becuase the other server was retiring. I recreated all my projects now I get the following error. I am on a Windows XP machine and DO have the 10g Client installed. Any help would be greatfully appreciated.
Exception in thread "main" java.lang.UnsatisfiedLinkError: no ocijdbc10 in java.library.path
     at java.lang.ClassLoader.loadLibrary(Unknown Source)
     at java.lang.Runtime.loadLibrary0(Unknown Source)
     at java.lang.System.loadLibrary(Unknown Source)
     at oracle.jdbc.driver.T2CConnection$1.run(T2CConnection.java:3135)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.jdbc.driver.T2CConnection.loadNativeLibrary(T2CConnection.java:3131)
     at oracle.jdbc.driver.T2CConnection.logon(T2CConnection.java:221)
     at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414)
     at oracle.jdbc.driver.T2CConnection.<init>(T2CConnection.java:132)
     at oracle.jdbc.driver.T2CDriverExtension.getConnection(T2CDriverExtension.java:78)
     at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
     at java.sql.DriverManager.getConnection(Unknown Source)
     at java.sql.DriverManager.getConnection(Unknown Source)
     at boa.Sword.db.srdDBCommon.getConnection(srdDBCommon.java:13)
     at boa.Sword.mods.srdUIProcedures.getCurrentUser(srdUIProcedures.java:229)
     at boa.Sword.gui.srdMainapp.run(srdMainapp.java:73)
     at boa.Sword.gui.srdMainapp.main(srdMainapp.java:448)

I suppose there really is a reason for using the OCI driver.
Windows has a PATH environment variable. That is where windows looks for dlls (at least in this case.)
There are two possibilities
1. The system env var doesn't have the value.
2. However you are starting the application it is resetting PATH. So you need to figure out how it does that and adjust so it does include it. This normally means that you use some other environment variable, specific to the app, which is used in the start up to create a PATH.

Help: java.library.path and javah

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