ansaurus

Question

Deployment in tomcat

Answer 1

+2 A:

You cannot load a DLL on an external host. It has to be an absolute disk file system -as the exception message already hints. Your best bet is to download it manually, create a temp file and load it instead.

File dllFile = File.createTempFile("jinvoke", ".dll");
InputStream input = new URL(getCodeBase(), "lib/jinvoke.dll").openStream();
OuptutStream output = new FileOutputStream(dllFile);
// Write input to output and close streams the usual Java IO way.

// Then load it using absolute disk file system path.
System.loadLibrary(dllFile.getAbsolutePath());
dllFile.deleteOnExit();

BalusC 2010-09-24 12:58:35

Balus i am using an applet the inculding its jar in a jsp page i have made this in netbeans, i think there is another way around if i include the dll and then make a war file in netbeans

Java_NewBie 2010-09-24 13:25:03

Uhm, your point being...?

BalusC 2010-09-24 13:33:56

my point is that there is a dll with the jinvoke pacakge should i include that dll in the lib folder, basically in lib folder there is a jinvoke.jar when i extract that jar file it contains the folder "native" and then jinvoke.dll so my point is that it should extract it and find the jinvoke.dll

Java_NewBie 2010-09-24 13:38:05

To be sure, do you have the DLL in `/lib` or `/WEB-INF/lib` folder? The `/WEB-INF` folder is inaccessible by public users. I'd suggest to put the DLL file in the same folder as the JAR file of the applet (and change the above code example to remove `lib/` part).

BalusC 2010-09-24 13:43:12

no there is no dll in lib folder, let me check by putting a dll file in it

Java_NewBie 2010-09-24 13:45:42

Oh? Where did you expect that the client would find the DLL file? You need to provide the DLL file along with the applet's JAR file.

BalusC 2010-09-24 13:57:38

same in the lib folder

Java_NewBie 2010-09-24 14:18:39

and now it is giving an exception at my end tooo

Java_NewBie 2010-09-24 14:19:21

Exception in thread "AWT-EventQueue-2" java.lang.UnsatisfiedLinkError: Expecting an absolute path of the library: http:\localhost:8080\DllTest\lib\jinvoke.dll

Java_NewBie 2010-09-24 14:20:01

I've already answered that problem in my answer. Did you update the applet's code accordingly?

BalusC 2010-09-24 14:22:13

hmmmm rite got your point

Java_NewBie 2010-09-24 14:26:48

hi Balus, when i call dllFile.deleteOnExit(); method, it cannot delete the file the file still exists there.

Java_NewBie 2010-09-30 14:32:05

It will only delete when the JVM exits, not when the applet exits :) If you want to delete it on exit of applet, then make it an applet property and delete it during `stop()`.

BalusC 2010-09-30 14:44:54

hmmmm thnx Balus :) i will try this out.

Java_NewBie 2010-09-30 15:08:44

Balus i have made a method Stop(){ dllFile.deleteOnExit(); } but still not deleting and with dllFile.delete() not deleting the file

Java_NewBie 2010-09-30 15:18:36

I think it is a dll so both will not work i guess

Java_NewBie 2010-09-30 15:21:22

Oh it indeed won't work for dll files. Java has to unload it first. Right, better just do it when JVM exits.

BalusC 2010-09-30 15:25:39

ok thanks Balus

Java_NewBie 2010-09-30 15:34:26

You're welcome. Don't forget to mark an answer accepted if it helped in solving the problem. See also http://stackoverflow.com/faq.

BalusC 2010-09-30 15:35:53

minus deleteFileOnExit(), the answer is accepted, it helped me a lot.

Java_NewBie 2010-09-30 15:39:41

Balus any email if i want to contact you of any problem regarding java, java technologies, frameworks. i am new to this but have read java :).

Java_NewBie 2010-09-30 15:42:09

Just press `Ask Question` button at right top of this page :) Enough people around who want to help -including me.

BalusC 2010-09-30 15:43:21

yeah i know that :D, but if more specificaly ask the question only from you i will visit your profile :)

Java_NewBie 2010-09-30 15:46:16

ansaurus

tags:

views:

answers:

Deployment in tomcat

related questions