[Newbie] Bundling App classes+ util jars with jni libraries
Hi,
first off, im a noob if it gets to creating archives... I can make a simple archive if I dont have special depedancies but beyond that... :)
I have my app's classes and two utility jar files which also need respective jni libraries.
Can I pack all of it in an archive for zero deploy or do the jni libraries need to be installed?
Thanks,
Dominik
Since the jni-Libraries (or .so/.dll if you're doing a multi-platform deploy) contain native code, they have to be loaded and memory-mapped by the OS, so I'd guess that they have to be deployed seperately from your .jar file.
They don't however need to be installed into the system and can reside in a seperate directory in the applications directory structure. Then you will only have to tell the JRE about this directory (let's call it "./lib"):
java -Djava.library.path=./lib -jar myapp.jar
HTH :)
Marcus
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Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/ Contents/Resources/Java/deploy.jar", should be -rw-r--r-- , they are lrw-r--r-- .
Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/ Contents/Resources/Java/libdeploy.jnilib", should be -rwxr-xr-x , they are lrwxr-xr-x .
Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent" has been modified and will not be repaired.
Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Rem ote Desktop Message.app/Contents/Resources/English.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x .
Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Su pport/LockScreen.app/Contents/Resources/English.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x .Ignore all these.
http://support.apple.com/kb/TS1448?viewlocale=en_US -
Class to jar communication at run time
Hi,
I am developing a application using jdk 1.4 and have following query:
I have an application that displays some information in various languages (according to the language selected), i.e english, french, german etc. Say I select english, the application will display "Hello World" in English language and so on for other languages..
So my app is divided into three parts:
1) Core application : displaying information
2) XML file: Containing list of languages in XML format. This XML File can be updated for adding new languages. The format of XML file is somewhat as
<LANGUAGE_NAME>___</LANGUAGE_NAME>
<CLASS_LANG>____</CLASS_LANG>
3) A seprate JAR file :Having set of classes corresponding to each language. The JAR file should be such that we can add classes for new languages added.
The Workflow of app is as follows:
When ever we run the application, the application reads the list of languages from the XML file and populats the list in a drop-down list box. Now, upon clicking a "GO" button, the application checks the language selected and calls the JAR will. It sends the class name corresponding to the language selected. And the class should return the information back to the application.
Now, this process should be dynamic, i.e user can update XML with new language and update the JAR file with new class name.
And upon just re-running the application, the application should be able to use features of new language.
Consider that we have already shipped the application. All we have to do is to send updated JAR file to the user. and ask him to update the XML file for new language. i.e no changes to be done at application. And application should communicate with update JAR files at the end user.
Now I have following queries:
1) Is the above process possible? If yes, then
2) How to communicate my application with the new class files in JAR file. i.e how to communicate my class with the UPDATED class in JAR file. Any prototype code to achieve this functionality would be of great help. Remember all this need to happen at run time.
I hope my question is clear. Feel free to ask any queries.
Thanks,
rdhJava has a mechanism to cope with this - though it is not XML-based:
java.util.ResourceBundle
I would store the required resource (a property file or the XML or a jar) separately. -
Using external util JAR from Session EJB
I have a Stateless Session EJB that uses some classes packaged in a utility jar. How do I package the EJB jar with this util jar, and get the app server to recognize this utility jar? including a /lib dir with the utils jar in it, like you would with a WAR, doesn't work.
I've temporarily got this to work by modifying the startup scripts for my app server to ensure my jar is included in the -classpath arg, but this cannot be the intended way. (cannot find details on this in the tutorial).
Thanks in advance!Well, the answer depends a lot on which appserver you're using, because it obviously depends on how the vendor implemented the containers' ClassLoaders. What usually works is dependent upon a portion of the JVM spec regarding the MANIFEST.MF file. If you package your ejb.jar and library.jar in an .ear file, you can put the following in the ejb.jar MANIFEST.MF:
ClassPath: library.jarNote that there must be at least one blank line at the end of the MANIFEST.MF file.
This works on WebLogic, but, as an example, JBoss uses a single ClassLoader, so I'm not entirely sure how you'd go about the same thing there.
And you're quite right - putting it in the JVM ClassPath is not a good idea...
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