Re: [Wrapper-user] error loading Wrapper.dll

[Leif M. <le...@ta...>]

Giovanni,
    There are a couple of problems here.

    The first problem is that it is not possible to modify the library 
path once the JVM has
been launched.  You are changing the value in memory which  the Wrapper 
then uses to
try to figure out why it could not load the wrapper.dll library.  The 
Wrapper thinks that
the library was on the path but could not be loaded.  It then shows the 
message that you
are seeing.   The problem is that the actual library path that the JVM 
uses to load the
libraries is empty.
    To fix this, you want to add the following to the command line you 
are using to launch
the Wrapper.
java -Djava.library.path=D:\j2sdk1.4.2\tools\wrapper_win32_3.0.5\lib 
-classpath path classname

    This will get you a little farther but things will still not work 
for you.   The problem is
that the WrapperActionServer, or more accurately, the WrapperManager 
class was not
designed to work the way you are trying to use it.

    I tried out your program and discovered a problem that makes it 
impossible to kill the
JVM using CTRL-C if a WrapperListener is never registered with the 
WrapperManager.
This will be fixed in the net release.

    I also noticed that the WrapperManager.requestThreadDump() does not work
correctly when the JVM is not being controlled by the JVM (On 
Windows).   I am
looking into why that is.

    Have you read over the Integration manual yet? It will give you an 
idea of how the
Wrapper and its classes were intended to be used.
http://wrapper.tanukisoftware.org/doc/english/integrate.html

    If there is a reason why you want to use the Action class without 
using the full
Wrapper could you explain it to me?  It might be an area worth supporting.

Cheers,
Leif
  
Giovanni Regola wrote:

> dear experts,
>  
> I would like to get a thread dump of my app via telnet.
>  
> This is the code:
>  
> *package* it.soltec.test;
>  
> *import* java.io.IOException;
> *import* java.util.Date;
> *import* java.util.Timer;
> *import* java.util.TimerTask;
> *import* org.tanukisoftware.wrapper.WrapperActionServer;
>  
> *public* *class* TestWrapper {
>  
> *    private* Timer timer = *new* Timer();
> *    private* MyTimer myTimer = *new* MyTimer();
> *    private* String library = "java.library.path";
> *    private* String wrapperDllPath = 
> "D:\\j2sdk1.4.2\\tools\\wrapper_win32_3.0.5\\lib";
>  
> *    public* TestWrapper() {
> *        int* port =9999;
>         WrapperActionServer server = *new* WrapperActionServer( port );
>         server.enableShutdownAction( *true* );
>         server.enableHaltExpectedAction( *true* );
>         server.enableRestartAction( *true* );
>         server.enableThreadDumpAction( *true* );
>         server.enableHaltUnexpectedAction( *true* );
>         server.enableAccessViolationAction( *true* );
>         String property = System.getProperty(library)+";"+wrapperDllPath;
>         System.setProperty(library,property);
>         System.out.println(System.getProperty(library));
> *        try* {
>             server.start();
>             System.out.println("Server running on port "+port);
>         } *catch* (IOException e) {
>             e.printStackTrace();
>         }
>         timer.schedule(myTimer, 0, 5000);
>     }
>  
> *    private* *class* MyTimer *extends* TimerTask {
> *        public* *void* run() {
>             System.out.println("time: "+*new* Date());
>         }
>     }
>  
> *    public* *static* *void* main(String[] args) {
> *        new* TestWrapper();
>     }
> }
>  
> When I try to connect via telnet I get the following error:
>  
> D:\j2sdk1.4.2\bin;.;C:\WINNT\system32;C:\WINNT;C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;C:\Programmi\Microsoft 
> SQL Server\80\Tools\Binn\;C:\PROGRA~1\ULTRAE~1;D:\Programmi\Sun 
> Microsystems\Message Queue 
> 3.0\bin;C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;C:\Programmi\Microsoft 
> SQL Server\80\Tools\Binn\;C:\PROGRA~1\ULTRAE~1;D:\Programmi\Sun 
> Microsystems\Message Queue 
> 3.0\bin;D:\jakarta-ant-1.5\bin;D:\j2sdk1.4.2\bin;D:\TowerJ\bin\x86-w32;D:\Programmi\Microsoft 
> Visual Studio .NET\Vc7\bin;;D:\j2sdk1.4.2\tools\wrapper_win32_3.0.5\lib
> Server running on port 9999
> time: Fri Oct 31 10:39:05 CET 2003
> time: Fri Oct 31 10:39:10 CET 2003
> time: Fri Oct 31 10:39:15 CET 2003
> time: Fri Oct 31 10:39:20 CET 2003
> WARNING - Unable to load native library 'Wrapper.DLL'. The file
> is located on the path at the following location but could
> not be loaded:
> D:\j2sdk1.4.2\tools\wrapper_win32_3.0.5\lib\Wrapper.DLL
> Please verify that the file is readable by the current user
> and that the file has not been corrupted in any way.
> System signals will not be handled correctly.
> wrapper library not loaded.
>  
> Do you know how to solve this problem?
>  
> thanks in advance
>  
> Giovanni Regola