UnJar Jar Files

Hello all,
Could someone point me to an unjarring tool. I need to take a jar file and unjar it. Not using WinZip though. I'm told that that doesn't always work correctly.
Thanks.
Lynn

Use jar -xvf <source jar> from the command window to extract the Jar file.
If tou just want to view the content of the jar file use jar -tvf <source jar> from the command.

Similar Messages

UnJar a .JAR file

Hello!
Im tring to unjar a .JAR file to view its sourcecode. Is this possible and if it is how do i do it?
Thanks

You can open it with e.g. winzip another program like that and you can unzip it. Then you will probably get .class files. You will need a decompiler to get the source code of the .class files.

How to extract JAR file in particular directory

Hi,
I am extracting a JAR file(A.jar) in a Makefile
Now the path of the Makefile is say /home/developer/
The location of the JAR file is in /opt/tools/mk/A.jar
I am extracting the jar file as:
jar xvf /opt/tools/mk/A.jar
This creates a directory named "A" under /home/developer, since the location of the Makefile is at /home/developer.
Question) How do I unjar /opt/tools/mk/A.jar under /opt/tools/mk/ itself, irrespective of the location of the Makefile?
thanks

jar -?
Usage: jar {ctxu}[vfm0Mi] [jar-file] [manifest-file] [-C dir] files ...
Options:
    -c create new archive
    -t list table of contents for archive
    -x extract named (or all) files from archive
    -u update existing archive
    -v generate verbose output on standard output
    -f specify archive file name
    -m include manifest information from specified manifest file
    -0 store only; use no ZIP compression
    -M do not create a manifest file for the entries
    -i generate index information for the specified jar files
    -C change to the specified directory and include the following fileI'd say you may want to try the -C option

Picking up JAR files from JSP's

I have a web application with some JAR files that live under the WEB-INF/lib directory.
My understanding of webservers (Tomcat, Weblogic, Dynamo, Orion, Resin) is that files under
WEB-INF/lib will be picked up on the servlet CLASSPATH.
Using iAS 6 SP3 however, the deploytool seems to unjar all the JAR files under WEB-INF/lib, which is
fine except that some of my classes aren't being picked up. My custom tag classes are being found,
but org.xml.sax.XMLReader is not found, even though the class file exists.
Any idea what is happening here?
Thanks
Mat.

Hi Barry,
Where was your course held out of interest ? Ours was in Holland.
Wildcards definitely work as we tried this on the course.
Alternatively, you could make sure the directory you are processing only has files in for this process and nothing else then you could process everything regardless of the name just use .
Good luck with your processing.
If this helps, please award the points as so few people do
You can do this by clicking on the yellow star next to my answer.
Cheers
Colin

Including a DLL in JAR file (Comm API)

Writing a little app that interfaces with serial port device using the communications API and I'd like to bundle it into an executable JAR. JBuilder will create the JAR for me fine, but the issue is with the win32com.dll file thats part of the comms API. I need to include this, I don't think its possible to include as part of the executable, but otherwise the DLL needs to be in the windows\system folder. Could I include the dll as part of the JAR archive and then extract it upon runtime? If so how would I go about this?
Any help much appreciated.

There is another option. Native libraries need to reside within the java.library.path location. As it turns out, if you, at runtime, grab this property and ADD your own location to it, then set it back in to the System.setProperty() call, it will NOT work. The only way to do it is the -Djava.library.path value that tjmaven suggested.
However, if you read up on how a native library is found, it uses the ClassLoader.loadLibrary() which calls the protected findLibrary() method. You can therefore extend ClassLoader to find a path yourself.
One way is to extend URLClassLoader since it has the protection/security stuff AND the ability to look in .jar files for you. Your custom loader is created by a "launcher" class in your .jar file. First, your luancher uses getClass().getProtectionDomain().getCodeSource().getLocation() to get the absolute location of the .jar file its executing within. From there, you open the jar and look for your native library, extract it using the JAR api to a location of your choosing. Now, you instantiate the custom classloader and using this custom loader instance you load the rest of your classes. The main .jar file contains two classes, the launcher and the custom classloader, and contains the native library if you wish to do it this way. The custom classloader, you specify a URL[] of "classpath" entries. You bundle up the rest of your source in a second .jar file that you pass to the URL[] when creating the custom classloader. It will find all your classes in the 2nd jar no sweat. You can even "reload" these classes on the fly by recreating the custom classloader instance if you so wish to add a sort of "reload" feature.
Now, in your custom classloader, you override the findLibrary() and return the SAME STRING PATH that you used to unjar your native files to. This way, when the JVM asks your custom loader to load the library at some path, you return the right path to find the native files in.
I haven't verified that this works just yet, but I will soon. Primarily, my plugin engine over at www.platonos.org will support the ability to place native libraries in plugins, allowing you to effectively wrap a native library use as a plugin. Not yet working, but we'll soon have it in place.

Unzipping a jar file

how do Unzip a jar file?

You can unjar a file giving
" jar -xvf filename.jar " at the command prompt if u don't have a jar.exe please try using winzip/unzip..
ebistro

Read images from a jar file?

Hello, I'm converting a 6i app to 10g. This app does a ton of read_image_file() calls to
change GIF images on the screen based on user actions. In 6i the images are all stored on the local hard drive. The images are not icons for buttons, but images that appear in different locations on the screen.
For 10g, is it possible to leave the images in a jar file and effectively read the images from that? Otherwise, I suppose I'm looking at using webutil functionality to download the jar file and unjar it into an images directory for reading from the client?
Any best-practice scenario for this sort of thing?
Thanks for any info,
Gary

We are migrating from 6i to 10g too. And I try to not use webutil. All my pictures (icons gif files) are in a jar file.
Just make attention of the size of your pictures. The jar file is loaded when you launch the application (the first time, and after, only if the jar file has changed).

Webutil - Config and Jar Files

Hi List,
I am using Webutil for the first time .I have downloaded demo from OTN .WHich has pll,olb,jar ,dll files.I have gone through the manual following few things are still not clear
1.where to store/keep Webutil.config and how do we refer to that file .
2.If Formsweb.confog required? are these both config files required and where to keep and how do we give path to these two files
3.how to refer webutil.jar file.which path these jar files needed to be kept ? do we have to unjar or something ?
Thanks in advance
Regards
Sripad

1.where to store/keep Webutil.config and how do we refer to that file .
A: you decide and configure the webutil required file location saccordingly. I would suggest to store the webutil directory in the forms90 directory for simplicity
2.If Formsweb.confog required? are these both config files required and where to keep and how do we give path to these two files
A: Forms basic knowledge: The formsweb.cfg file and the default.env file are used by Forms - unless configured otherwise - to define the runtim environment (default.env) and the application runtime commands (formsweb.cfg). Both files are required and available in the forms90/server directory
3.how to refer webutil.jar file.which path these jar files needed to be kept ? do we have to unjar or something ?
Don't unjar. Copy the jar file to forms90/java. This way you van reference it by its name
archive= ... other files ..., webutil.jar
Frank

Jar file question.

if i unjar a jar file, how do i let java
know where the classes are?
thanks for any help
owen

Considering your .jar file is in the desktop folder,
c:\Windows\desktop>jar -xf abc.jar
This will cause the class files in the jar file copied in the desktop.
Hope it helps
Uma
Java Developer
http://www.javagalaxy.com

JAR File problems

Hello,
I have a jar file with some code I wrote that accesses a jar file from a 3rd party. I want to include the 3rd party jar files inside my jar file. So I basially have a jar file with my code (unjarred) and include the 3rd party jar files in my jar. In my MANIFEST.MF file I have properly set the Main-Class property correctly, as well as the Class-Path property. I have set my Class-Path value to 3rdparty.jar which is the jar file at the root directory of my jar. When I run my jar file I get a NoClassDefFoundError saying the 3rdparty jar file is not found. I have added a new line at the end of my MANIFEST.MF file, and am actually using ant to create my MANIFEST.MF file. When I unjar my file everything looks correct. What is the problem here? I have made sure the 3rd party classes that my code access are in the jar. What could I be doing wrong??

Standard Java does not support placing a jar file within another jar.
You can search for 3rd-party alternatives, ow write your own custom classloader.

Import a BPM project .jar file in jedevloper

Hi,
Can we import a BPM .jar file in jdeveloper, to regenrate the underlying code. this jar is having the BPM and SOA code.
<< the actual case is to import the deployed BPM .jar file project in jdeveloper. >>
thanks,
rps

You can unjar the file in your machine so that you have the source code.
Create a new BPM Application (make sure you name the project & process similar to what you have in the JAR).
After that copy & replace the unjared contents into the folder under <applicationName>/<projectName> except for <projectName>.jpr (since this is not in the jar).
try opening it from Jdev .. I could compile using a similar approach and open the BPM process too.
You would need to deploy and test the functionality to be sure that this works.

JAR file format

Hi,
I need to write a C program to retrieve class files from a JAR file. Can anybody point me to any resource that explains the format of a JAR file. Basically, I need to write my own "unjar" utility. Any help would be greatly appreciated. Thanks.
CharithaT

A JAR file is simply a ZIP file. zlib will do the decompressing for you!

Weblogic Classes / Jar files

Is there place that list the classes for a particular weblogic jar file? Right now a developer asked me what .jar file does this class, weblogic.logging.NonCatalogLogger, live in. The only way I know how to find out is to unjar each jar file until I find it. Is there an easier way?
Thanks.

you can use jarscan tool
http://it.cybergav.in/2009/09/30/scanning-jars-with-jarscan/

Icons in Jar file on Web

We have our application specific gif file in a jar file, and have placed this jar file in the virtual directory specified in our registry.dat file. The JInitiator console claims it finds the jar file and appears to be using other classes contained in the jar file but is NOT using the gifs we have included. If we unjar the gifs into the directory where the jar file resides the toolbar icons appear correctly.
What are we doing wrong? Do we need to include the jar file location in our classpath? We are running this using 9iAS with appache as our application ser and JInit 1.1.8.10 and Headstart 6.5.
We are running this on HP-UX B.11.00U and have managed to get the icons working under NT using appache/forms server configuration but not under unix with 9iAS. Any suggestions?

Hi Michelle,
when you included your gif files in the jar file, did you make sure that the gif files are not in a subdirectory. To check this open the file using winzip and see if all gif files are in the top level directory. If this is the case empty the jcache directory to make sure the jar file is indeed fetched after you changed the file.
Also beware that the name of your button image property is case sensitive. So if you have the icon property set to MyButton the gif file should also be called MyButton.gif. This can be verified in the Java Console of the jinitiator by looking at the gif file that it tries to fetch for your iconic button.
I hope this helps you a bit further.
Kind Regards,
Frank van der Borden
Oracle Support Services
Netherlands

Compiling Multiple Jar Files

Hello,
I have an application that I have been asked to take over and finish. This application has several jar files, but I only need to alter code that resides in one of the jar files. How do I recompile my code that is also dependant on the other jar files? Do I need to unjar everything recompile my code and then jar everything back up OR can I just leave the jars that don't need altered as is and recompile the one jar file by itself? Thanks,
Kelly

Thanks for the help, I'm having a bit of difficulty getting the command correct. Let's say I have:
one.jar
two.jar
three.jar
I unjarred one.jar and made some changes to x.java.
I typed in:
javac -cp /path/two.jar /path/three.jar /path/x.java
but it's not working. Thanks in advance!

UnJar Jar Files

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