Bundling in jar file doubt

my application uses the some image file and properties file i want to bundle all the required files into single jar file and while double click it should lonch
how can i acchive this

You're getting on my nerves, buddy. Most of your questions could be answeed by a little research.
ClassLoader.getResource
ClassLoader.getResourceAsStream
Exectualble JARs
If you now ask me to elaborate, I'll report you for abuse.

Similar Messages

Bundling .jar files to .app in Mavericks?

So I just updated to Mavericks like everyone else because it's free. However I am a Java developer and I would like to bundle my .jar files into a Mac executable. However, a few things have changed with Mavericks, as with all updates to OS X. For one thing, there's no /usr/share/ant/ directory. There's /usr/share/, but not an ant/ folder.
So my point is this: do you know of a good updated site that shows jar bundling?

This is how I managed to do it. I use NetBeans to compile to a .jar file. You also need to have the Java jdk1.7.0_45.jdk installed.
A) Download apache-ant-1.9.3-bin.tar.gz from http://ant.apache.org/bindownload.cgi to your Downloads folder
B) In the terminal do the following (taken with some changes from http://stackoverflow.com/questions/3222804/how-can-i-install-apache-ant-on-mac-o s-x)
cd ~/Downloads # Let's get into your downloads folder.
tar -xvzf apache-ant-1.9.3-bin.tar.gz # Extract the folder
sudo mkdir -p /usr/local # Ensure that /usr/local exists
sudo cp -rf apache-ant-1.9.3 /usr/local/apache-ant # Copy it into /usr/local
# Add the new version of Ant to current terminal session
export PATH=/usr/local/apache-ant/bin:"$PATH"
# Add the new version of Ant to future terminal sessions
echo 'export PATH=/usr/local/apache-ant/bin:"$PATH"' >> ~/.profile
C) Get appbundler-1.0.jar from http://docs.oracle.com/javase/7/docs/technotes/guides/jweb/packagingAppsForMac.h tml
There is some good detailed information there also about bundling.You may need to set your JAVA_HOME parameter.
D) Then comes the bundling procedure:
1) Compile your source code to get a .jar file in the dist folder.
2) Make a bundle file or if you use Netbeans, edit the file build.xml in the top project folder.
<taskdef name="bundleapp"
             classname="com.oracle.appbundler.AppBundlerTask"
             classpath="lib/appbundler-1.0.jar" />
    <target name="bundle">
        <bundleapp outputdirectory="dist"
            name="MySourceName"
            displayname="MySourceName"
            identifier="package.MySourceName"
            mainclassname="package.MySourceName">
            <classpath file="dist/MySourceName.jar" />
            <option value="-Dapple.laf.useScreenMenuBar=true"/>
       </bundleapp>
    </target>
Edit the above text in some simple text editor and exchange MySourceName with your project name and “package” with your package name. The line <option value="-Dapple.laf.useScreenMenuBar=true"/> will make your menu be placed in the Mac style.
Note! Beware of the difference “ and ". The corrrect one is the latter. TextEdit changed my hyphens to the bad ones which screwed up the bundling..
The edited file should reside in the top project folder under the name build.xml.
3) Place the appbundler-1.0.jar in a new “lib” folder in the top project folder.
4) Run terminal . Go to your Netbeans project folder using the cd command. The do
   ant bundle
and wait for BUILD SUCCESSFUL
The bundled Mac application will reside in the dist folder.
How to fix a specific icon to the application:
5) Open the bundled Mac application by CTRL-click and choose “Show Package Contents”
6) Double-click the Contents folder to open it. Put your tailor-made application icon “XXX.icns” in the Resources folder. Open the Info.plist and change Generic.icns to XXX.icns. Close the application folders. Sometimes the icon will only show up afterf you copy the application to another folder
Optional (This will make your application very big as it includes the Java jdk in the application, I didn't do this step. The only advantage is that it will make the application independent on the user having Java installed.a )
7) To include the jdk, open the app folder and put a copy of the jdk1.7.0_45.jdk in the Plugins folder.
Edit the Info.plist by adding a new child: JVMRuntime containing a string, jdk1.7.0_45.jdk

Creating selfstarting .jar file

hi
i would like to create a .jar file which will be execute when I click on it. Also when I copy it to the desktop I only have to click on the .jar file and the programm will execute. does I have to modifiy the manifest file?
thank for inputs.
st

Hi... yeah, stick a line somewhat like the following into the manifest file
Main-class: /*the fully qualified name of your main executable class here*/
Merry Christmas
/*the following stripped from http://java.sun.com/docs/books/tutorial/jar/basics/manifest.html */
Applications Bundled as JAR Files - version 1.2 only
If you have an application bundled in a JAR file, you need some way to indicate which class within the JAR file is your application's entry point. (Recall that the entry point is the class having a method with signature public static void main(String[] args).)
You provide this information with the Main-Class header, which has the general form:
Main-Class: classname
The value classname is the name of the class that is your application's entry point.

How to bundle java help class into jar file ?

Hi, all,
I have some package in my project, with which I have a java help jar file as classpath, when I run my project, I need the jh.jar file in directory /jar/jh.jar.
Now, I bundled all my class packages into a jar file, my.jar, together with the /jar directory. When i run my jar file with command:
java -jar my.jar
It tells me couldn't find javahelp class.
What shall I do? How can I create my jar file with the jh.jar?
Thanks in advance.

I think you'd be better off just adding the jh.jar as
a classpath argument and running it like that:
java -classpath /myjavalibdir/jh.jar -jar myjar.jar
...otherwise you're stepping into redistribution of
binary issues licensing-wise. That won't work either; when you run java with the -jar option, it ignores both the -classpath option and the CLASSPATH environment variable. However, it will see jh.jar automatically if you put it in the <path-to-java>/jre/lib/ext directory. But for distribution purposes, it might be simpler just to combime the contents of jh.jar into myjar.jar (if you use Ant, its <jar> task makes that very easy). Or, you can just run it this way:java -classpath myjar.jar;jar/jh.jar MyMainClassBTW, I don't think redistribution is a problem; otherwise how anyone even use JavaHelp?

Bundling a native library in a jar file

Is it possible to bundle a native library ( a windows dll ) in a jar file. How to let the vm know that the native dll is in a jar file.
Is this possible?
thanks
--kiran

hello all
i cann't find out (or don't understand) the way what i need. i mean how can i copy the dll file(s) in the windows system diractory? i can put the dll in the jar file then how can i copy that dll after extract?
"daney" said that he have done it.
This certianly is possible. I have done it.
You have to extract the dll from the jar file and write it to a temporary >file in the file system. Then call System.load() on the file you just >extracted.
Do you want to delete the temporary file when you are done with it? >That is a bit more difficult, but it is possible if you use a ClassLoader >to run your code containing native methods.anybody have any idea how he has done? please give some details if anyone have worked on it before.i am waiting for the solutions.
thanks
bashar

How do I read the images I bundled into the jar file?

I just wrote an applet that uses
Toolkit tk = Toolkit.getDefaultToolkit();
tk.getImage("blah.gif");to load a bunch of image files. The class file and gif images were bundled into a jar file to minimize the number of connections the browser has to make to the server.
The applet works fine in appletviewer but trips a java.security.AccessControlException: access denied (java.io.FilePermission select.gif read) when run in a browser. I know you normally use Applet.getImage(URL) to load images but wont that circumvent the JAR file and make a seperate connection to the server for each image? That would defeat the purpose of using a JAR file.
How do I access the image files I bundled into the JAR file?

From your Applet class, write the following:
URL imgUrl = getClass().getResource("blah.gif");
Image img = getImage(imgUrl);The returned URL will be from the Applet class ClassLoader, which will look into the specified archive (jar) file.

Reading Internationalised Bundles Outside of a Jar File

I have seen this question many times throughout this forum and other forums where a jar file is tryingto load a resource outside of the jar file. The answers are often scattered or partial solutions. This is an attempt to provide a complete solution.
Step 1)
In your manifest file add to the Class-Path attribute the current directory, ie . plus any other library files you require (seperated with spaces).
for example
Class-Path: . lib/log4j.jar
Step 2)
In your code, make sure that you are correctly requesting the resource. If you are requesting a resource from the directory where you are running your jar file from (i.e. the working directory), simply use ResourceBundle.getBundle("Resource"); or equivalent method.
If you bundle is within a directory, you must specify the directory when getting the Bundle as a dot seperated string, i.e.
ResourceBundle.getBundle("etc.i18n.Resource"); would look for the file <working-directory)/etc/i18n/Resource.properties.
I hope this may help people having problems with this excellent tool. Please feel free to add to this tutorial or amend any mistakes I may have made.
Good Luck
codemwnci

I followed the instructions here and had every thing correct. I created the jar with ant using fearly standard build.xml. Things didn't still work out. Spent few hours wondering why things don't work.
Reason: the property-files were not included in indexing.
Basically there is two way around:
1) Add the property files to the index of the jar.
The problem here is that you cannot have new property-files without creating the index again.
2) Don't do the indexing for the jar.
In this case the jar is not so well optimazed, and in some case that may be a little problem.

OSGI bundle creation using third party jar files

Hi,
I have a requirement to integrate our CQ5.5 based application with a third party. As part of this, I have to use some jar files. After lot of digging, I realised that the way to use external jar files is to create an OSGI bundle wrapping these jar files.
So, I tried to do the same, but when I see the service details in system/console, I see errors. Can someone please suggest what could have gone wrong?
I have to use 3 jar files. So, I placed them in lib folder as shown in the screenshot below.
Ibuilt the bundle using .bnd file. It generated a jar file in install folder and I am able to to see its details in system/console/bundles. When I try to view details of the OSGI bundle that is installed, I see errors as follows:

Here is my bnd file with all directives:
Export-Package: *
Import-Package: *
Private-Package: *
# Include-Resource:
Bundle-Name: External Jar OSGI
Bundle-Description: This OSGI bundle contains external jar file
Bundle-SymbolicName: com.self.learning.externaljarosgi
Bundle-Version: 1.0.0-SNAPSHOT
Bundle-Activator: com.self.learning.osgi.oauth.Activator
And here is what is shown in systems/console/bundle:
Imported Packagesjavax.crypto from org.apache.felix.framework (0)
javax.crypto.spec from org.apache.felix.framework (0)
javax.servlet from cqse-httpservice (21)
javax.servlet.http from cqse-httpservice (21)
net.oauth -- Cannot be resolved
net.oauth.client -- Cannot be resolved
net.oauth.client.httpclient3 -- Cannot be resolved
net.oauth.client.httpclient4 -- Cannot be resolved
net.oauth.server -- Cannot be resolved
net.oauth.signature -- Cannot be resolved
org.apache.commons.codec.binary from org.apache.commons.codec (46)
org.apache.commons.httpclient from com.day.commons.osgi.wrapper.commons-httpclient (77)
org.apache.commons.httpclient.methods from com.day.commons.osgi.wrapper.commons-httpclient (77)
org.apache.http -- Cannot be resolved
org.apache.http.client -- Cannot be resolved
org.apache.http.client.methods -- Cannot be resolved
org.apache.http.entity -- Cannot be resolved
org.apache.http.impl.client -- Cannot be resolved
org.apache.http.params -- Cannot be resolved
org.apache.http.util -- Cannot be resolved
org.osgi.framework from org.apache.felix.framework (0)
org.slf4j from slf4j.api (11)
Regarding Export-Package, I know the function, class and its package I need to use. Would it be fine if I just export that package instead of using '*'? In such case, if this has dependency on some function in one of the 4 jar files I need to use, how does it get resolved? Do I need to Export those packages as well?

Problem in bundling gifs in jar file.

Hello all,
I am having following package structure.
/* For example */
com.course.explorer;
com.course.explorer.toolbar;
and an image directory having all images in
com/course/explorer/images
Now to associate an ImageIcon with a button in toolbar package.
/* for example */
code from NewCourseBut.java present in com.course.explorer.toolbar package.
ImageIcon img = new ImageIcon(
getClass().getResource("../images/new_course.gif"));
Now my problem is when I am trying to run a jar file (containing all my code+images) it throws NullPointerException.( Unable to find the image new_course.gif)
I am not able to understand wher I am going wrong.
Can anyone please help me out in finding my fault.
Smiles,

Hello All,
Is there any standard way of incorporating gifs in an Jar file.
Consider that one is extracting an ImageIcon for a Toolbar button and for the same the gifs is present in an "images" directory.
I did tried alot of permutation & combinations still no luck.
How one need to proceed for same ?
Any guidance is welcome.
Smiles,

Doubt on writing a properties file in to jar file

hi,
I have a jar file. In that jar file, I have a folder, named '/data/'. In this data folder i want to write a properties file. how to write?
i was tried using the store method but i did not get it
can any one help me out.
thank you.

You want to place the log4j.properties inside the .jar? You can read the log4j.properties inside the jar and give the Properties to log4j like this:
String propertiesFile= "pathInJar/log4j.properties";
InputStream in = getClassLoader().getResourceAsStream(propertiesFile);
if (in != null)
    Properties props = new java.util.Properties();
    props.load(in);
    PropertyConfigurator.configure(props);
else
   //PropertiesFile not found! (Handle the problem)
}

Why -jar option used to install a software which is in executable jar file?

Hi all,
i have a query, i have a generic installer which is used to install the oracle weblogic 10.3 software in unix platform(i.e., which is in .jar extension) which is executable jar file.
To install this software which have to use -jar option to install
java -jar net_server<version>_generic.jar
my question that why we use -jar option to install or to extract the software
can any one clarify my doubt...
thanks in advance
abhi
Edited by: sumanth_abhi on Jan 27, 2009 11:50 PM

According to the Jar Guide (http://java.sun.com/j2se/1.4.2/docs/guide/jar/jarGuide.html)
Executable Jar Files
On Microsoft Windows systems, the Java 2 Runtime Environment's installation program will register a default association for Jar files so that double-clicking a Jar file on the desktop will automatically run it with javaw -jar. Dependent extensions bundled with the application will also be loaded automatically. This feature makes the end-user runtime environment easier to use on Microsoft Windows systems.
The Solaris 2.6 kernel has already been extended to recognize the special "magic" number that identifies a Jar file, and to invoke java -jar on such a Jar file as if it were a native Solaris executable. A application packaged in a Jar file can thus be executed directly from the command line or by clicking an icon on the CDE desktop.
Despite that every JAR file can be executed as a program if and only if the META-INF/Manifest.mf contains the Main-Class tag. This done through java -jar jarfile.jar
--olaf

Please I can not get a .jar file to run on XP SP3 start/run/cmd/

I can not get a .jar file to run on XP SP3 start/run/cmd/
Please help if can figure this out. I'm convinced it is a Windows XP SP3 problem from searching on google and seeing other ppl on XP SP3 with same problem (but no working solution for myself). I'll try to be complete-listing all I've done.
I had installed: Java SE Runtime Environment v6u14 for Windows Multi-language
I had checked here it was working properly: http://www.java.com/en/download/manual.jsp
I'm trying to run this jar file (soht-client-0.6.2.jar):
http://prdownloads.sourceforge.net/telnetoverhttp/soht-java-client-0.6.2.zip?download
http://www.ericdaugherty.com/dev/soht/javaclient.html < this is the information for the program.
(yes the file can be executed and should open the program's window
I wanted to post screenshot of it but friend that it's working for isn't here)
_(Please find log of all cmds I did in this post here: http://pastebin.com/f792983df )_
_I have extracted +'all' the files to: C:\062\+_ (I have tried using other directories, same problem)
++I then start/open/run/cmd+
then I: cd C:\062\+
then I try various commands - all+ of these do absolutely nothing- meaning no errors, no reply, no window opens, nothing except enters that directoy again:
java -jar soht-client-0.6.2.jar
java -jar -client soht-client-0.6.2.jar
java -client -jar soht-client-0.6.2.jar
java -jar soht-client-0.6.2.jar soht.properties
soht-client-0.6.2.jar
So I try this cmd: java soht-client-0.6.2.jar
Reply:
C:\062>java soht-client-0.6.2.jar
Exception in thread "main" java.lang.NoClassDefFoundError: soht-client-0/6/2/jar
Caused by: java.lang.ClassNotFoundException: soht-client-0.6.2.jar
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: soht-client-0.6.2.jar. Program will exit.
I try this cmd:
java -jar soht-client-0.6.2.jar -client
Reply:
C:\062>java -jar soht-client-0.6.2.jar -client
Unable to load configuration file: -client - java.io.FileNotFoundException: -cli
ent (The system cannot find the file specified)
SOHT Java Client
The SOHT Java Client requires a properties file. Either start
the application in the same directory as the soht.properties
file, or specify the file name on the command line:
java -jar soht-cleint-<version>.jar c:\soht.properties
So then I do these cmds which produce the exact same error/reply just above; Unable to load..:
j_ava -jar soht-client-0.6.2.jar -client soht.properties_
java -jar soht-client-0.6.2.jar -client C:\062\soht.properties
So then I copy soht.properties to C root and do:
java -jar soht-client-0.6.2.jar -client C:\soht.properties <same error as above
Then from other information I have read I right click on the .jar file, select open with Always open with:
_"C:\Program Files\Java\jre6\bin\javaw.exe"_
Try again.. same problem.
Then I do cmd:
_"C:\Program Files\Java\jre6\bin\javaw.exe" -jar "C:\062\soht-client-0.6.2.jar"_
does nothing, retry the other commands same thing (either nothing or those same replies)
Then I read (http://forums.sun.com/thread.jspa?threadID=5384879) someone had the same problem as I and they solved it by uninstalling all Java/reboot/ then install JDK 6 Update 14 with NetBeans 6.5.1 start NetBeans and then it worked for them.
So I unistalled all Java, rebooted and gave the cmd another try (before re-installing), now a new error, of course:
C:\062>java -jar soht-client-0.6.2.jar
'java' is not recognized as an internal or external command, operable program or batch file.
Then I install Java SE and NetBeans Cobundle (JDK 6u14 and NB 6.5.1) Final Release/ reboot/ open Netbeans/
go to test java page; all is good, run cmds again -and still nothing..
C:\062>java -version
java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode, sharing)
I reassociate program with: C:\Program Files\Java\jre1.6.007\bin\javaw.exe_
same thing.. nothing
Thank you very much for your time :D_
PS. My computer has been newly reformatted so needing another reformat I'm sure is not the solution.

Thank you very much for your replies Taggert_77 & swmtgoet_x :D
Taggert77_: I have never used NetBeans. I only installed it in the bundle as I had read on another post that somehow installing the bundle magically helped another user with the same problem (he didn't know why it worked after that either).
Before XP SP3 I was able to execute .jar file through cmd prompt. Now I am not.
This file is executable, grab it and you will see. Here is a screen shot (program in front is FlashFXP, behind is the cmd prompt and what should happen):http://www.freeimagehosting.net/uploads/53273b4ddf.jpg
swmtgoetx_: I only did the other cmd's to try to make it spit out something, anything lol :D
The proper cmd is simply: java -jar soht-client-0.6.2.jar
I did give your cmd a try, and it produced nothing :( (just like the other correct cmds)
java -client -jar soht-client-0.6.2.jar soht.properties
Thank you again...the mystery remains
PS. If you do a search for this you'll find an amazing amount of XP SP3 users with the same problem and no solution posted that I could find except one chap that did the unistall install order that I did above).

Adding JAR file to project

Hi All
How can i add jar to my project environment.
Actually what i did was.
Created one folder called "JavaWork" like d:\JavaWork
and put the jar file into this folder and wrote a test class which is importing some classes from the jar file.
how to use jar ? Please someone help me.
Thanks in advance
Shan

`man jar`
jar(1) jar(1)
NAME
jar - Java archive tool
SYNOPSIS
jar [ -C ] [ c ] [ f ] [ i ] [ M ] [ m ] [ O ] [ t ] [ u ]
[ v ]
[ x file ] [ manifest-file ] destination input-file
[ input-files ]
DESCRIPTION
The jar tool is a Java application that combines multiple
files into a single JAR archive file. It is also a gen-
eral-purpose archiving and compression tool, based on ZIP
and the ZLIB compression format. However, jar was
designed mainly to facilitate the packaging of Java
applets or applications into a single archive. When the
components of an applet or application (.class files,
images and sounds) are combined into a single archive,
they can be downloaded by a Java agent (like a browser) in
a single HTTP transaction, rather than require a new con-
nection for each piece. This dramatically improves down-
load time. The jar tool also compresses files, which fur-
ther improves download time. In addition, it allows indi-
vidual entries in a file to be signed by the applet author
so that their origins can be authenticated. The syntax
for the jar tool is almost identical to the syntax for the
tar(1) command. A jar archive can be used as a class path
entry, whether or not it is compressed.
The three types of input files for the jar tool are:
o Manifest file (optional)
o Destination jar file
o Files to be archived
Typical usage is:
example% jar cf myjarfile *.class
In this example, all the class files in the current direc-
tory are placed in the file named myjarfile. A manifest
file is automatically generated by the jar tool and is
always the first entry in the jar file. By default, it is
named META-INF/MANIFEST.MF. The manifest file is the
place where any meta-information about the archive is
stored. Refer to the Manifest Format in the SEE ALSO sec-
tion for details about how meta-information is stored in
the manifest file.
To use a pre-existing manifest file to create a new jar
archive, specify the old manifest file with the m option:
example% jar cmf myManifestFile myJarFile *.class
When you specify cfm instead of cmf (that is, you invert
the order of the m and f options), you need to specify the
name of the jar archive first, followed by the name of the
manifest file:
example% jar cfm myJarFile myManifestFile *.class
The manifest uses RFC822 ASCII format, so it is easy to
view and process manifest-file contents.
OPTIONS
The following options are supported:
-C Changes directories during execution of the jar com-
mand. For example:
example% jar uf foo.jar -C classes *
c Creates a new or empty archive on the standard out-
put.
f The second argument specifies a jar file to process.
In the case of creation, this refers to the name of
the jar file to be created (instead of on stdout).
For table or xtract, the second argument identifies
the jar file to be listed or extracted.
i Generates index information for the specified jar
file and its dependent jar files. For example,
example% jar i foo.jar
would generate an INDEX.LIST file in foo.jar which con-
tains location information for each package in foo.jar and
all the jar files specified in foo.jar's Class-Path
attribute.
M Does not create a manifest file for the entries.
m Includes manifest information from specified pre-
existing manifest file. Example use:
example% jar cmf myManifestFile myJarFile *.class
You can add special-purpose name-value attribute
headers to the manifest file that are not contained
in the default manifest. Examples of such headers
are those for vendor information, version informa-
tion, package sealing, and headers to make JAR-bun-
dled applications executable. See the JAR Files
trail in the Java Tutorial and the JRE Notes for
Developers web page for examples of using the m
option.
O Stores only, without using ZIP compression.
t Lists the table of contents from standard output.
u Updates an existing JAR file by adding files or
changing the manifest. For example:
example% jar uf foo.jar foo.class
adds the file foo.class to the existing JAR file
foo.jar, and
example% jar umf foo.jar
updates foo.jar's manifest with the information in
manifest.
v Generates verbose output on stderr.
x file
Extracts all files, or just the named files, from
standard input. If file is omitted, then all files
are extracted; otherwise, only the specified file or
files are extracted.
If any of the files is a directory, then that direc-
tory is processed recursively.
EXAMPLES
To add all of the files in a particular directory to an
archive:
example% ls
0.au 3.au 6.au 9.au at_work.gif
1.au 4.au 7.au Animator.class monkey.jpg
e.au 5.au 8.au Wave.class spacemusic.au
example% jar cvf bundle.jar *
adding: 0.au
adding: 1.au
adding: 2.au
adding: 3.au
adding: 4.au
adding: 5.au
adding: 6.au
adding: 7.au
adding: 8.au
adding: 9.au
adding: Animator.class
adding: Wave.class
adding: at_work.gif
adding: monkey.jpg
adding: spacemusic.au
example%
If you already have subdirectories for images, audio
files, and classes that already exist in an HTML direc-
tory, use jar to archive each directory to a single jar
file:
example% ls
audio classes images
example% jar cvf bundle.jar audio classes images
adding: audio/1.au
adding: audio/2.au
adding: audio/3.au
adding: audio/spacemusic.au
adding: classes/Animator.class
adding: classes/Wave.class
adding: images/monkey.jpg
adding: images/at_work.gif
example% ls -l
total 142
drwxr-xr-x 2 brown green 512 Aug 1 22:33 audio
-rw-r--r-- 1 brown green 68677 Aug 1 22:36 bundle.jar
drwxr-xr-x 2 brown green 512 Aug 1 22:26 classes
drwxr-xr-x 2 brown green 512 Aug 1 22:25 images
example%
To see the entry names in the jar file using the jar tool
and the t option:
example% ls
audio bundle.jar classes images
example% jar tf bundle.jar
META-INF/MANIFEST.MF
audio/1.au
audio/2.au
audio/3.au
audio/spacemusic.au
classes/Animator.class
classes/Wave.class
images/monkey.jpg
images/at_work.gif
example%
To display more information about the files in the
archive, such as their size and last modified date, use
the v option:
example% jar tvf bundle.jar
145 Thu Aug 01 22:27:00 PDT 1996 META-INF/MANIFEST.MF
946 Thu Aug 01 22:24:22 PDT 1996 audio/1.au
1039 Thu Aug 01 22:24:22 PDT 1996 audio/2.au
993 Thu Aug 01 22:24:22 PDT 1996 audio/3.au
48072 Thu Aug 01 22:24:23 PDT 1996 audio/spacemusic.au
16711 Thu Aug 01 22:25:50 PDT 1996 classes/Animator.class
3368 Thu Aug 01 22:26:02 PDT 1996 classes/Wave.class
12809 Thu Aug 01 22:24:48 PDT 1996 images/monkey.jpg
527 Thu Aug 01 22:25:20 PDT 1996 images/at_work.gif
example%
If you bundled a stock trade application (applet) into the
following jar files,
main.jar buy.jar sell.jar other.jar
and you specified the Class-Path attribute in main.jar's
manifest as
Class-Path: buy.jar sell.jar other.jar
then you can use the i option to speed up your applica-
tion's class loading time:
example$ jar i main.jar
An INDEX.LIST file is inserted in the META-INF directory
which will enable the application class loader to download
the right jar files when it is searching for classes or
resources.
SEE ALSO
keytool(1)
JAR Files @
http://java.sun.com/docs/books/tutorial/jar/
JRE Notes @
http://java.sun.com/j2se/1.3/runtime.html#exam-
ple
JAR Guide @
http://java.sun.com/j2se/1.3/docs/guide/jar/index.html
For information on related topics, use the search link @
http://java.sun.com/
13 June 2000 jar(1)

Get list of classes present in an applet's Jar file?

I have an applet for drawing diagrams, which is bundled in a jarfile together with classes for each type of element in the drawing (e.g. a class for drawing 2-input NAND gates, a class for J-K flip-flops, and so on). When I add a new type of drawing element I have to modify the applet to add the new class to the applet's "Insert" menu to allow the element to be inserted. What I want to do is to search the jarfile containing the applet for any classes derived from DrawingElement and add them automatically to the Insert menu when the applet is inited. I presume this would require using getClass().getClassLoader() to get the class loader that read the JAR file, but from there it would seem I need to know the name of the resource to load. Is there a way of browsing the list of resources in the JAR file?

AndrewThompson64 wrote:
That 'modify the applet' is not strictly necessary. The list of menu items and classes might be passed to the applet as applet parameters, or as a property file or XML (or whatever) that defines the available elements.I could do this -- I'm just trying to avoid getting the list out of step with the contents (or if you prefer, I'm just being lazy!).
Is there a way of browsing the list of resources in the JAR file?Yes and no. You might try this general strategy (untested).
1) Gain an URL to a resource in the Jar in which the plug-ins exist.
2) Parse that URL for everything before the '!' symbol to get an URL for the Jar itself.
3) Get an InputStream from the Jar via URL.openStream().
4) Get a ZipInputStream by wrapping the InputStream.
5) Iterate the ZipEntry(s) to identify classes in the correct package, and store them in a collection of some type.
6) Iterate the collection and check each one for extending DrawingElement, using reflection.
I am guessing step 6 will require the applet to be trusted.Sounds plausible, and I'll give it a whirl. However, I hadn't thought about the "trusted" bit of this; maybe I can just create new instances and cast to DrawingElement, ignoring any that throw exceptions. I'll have to give it a go and see what happens.
BTW - once you have the right classes, how do you get the screen name of them? Is the name defined in one of the attributes of a DrawingElement? What prevents name clashes?Plan A: I have a getIdentification() method that returns a string identifying the element, but I have to keep this unique the hard way (by hand).
Plan B: use the class name with some prettification (e.g. have a class _2_input_NAND_gate which gets displayed as "2 input NAND gate") so that the compiler does the work of keeping it unique. Not sure I like this, though.
Many thanks for your help.

How to access a jar file in EAR file?

I have a EAR file which contains EJB.jar file and util.jar file. Outside of EAR, I mean in client side, I need to reference util.jar file. How can I access it?
EAR structure is
|--+META-INF/
|--|---application.xml
|--|---manifest.mf
|--EJB.jar
|--|---+MEAT-INF/
|--|---|--- deployment descriptors...
|--|---|--- manifest.mf
|--|--- EJB classes
|--Util.jar
Util.jar must be executed in server side. If I just add Util.jar in client program's classpath, when client program is executed, serverside Util.jar is executed? Or what else I should do in the client program to reference server-side Util.jar?

Excellent question. I don't see any client-jar in your EAR file structure. So I am assuming you are writing a separate client application which will talk to the ejbs deployed as part of this EAR. You need to do the following:
Write another EAR file with the following structure:
ear:
META-INF/application.xml
util.jar
client.jar
client.jar should have a META-INF/MANIFEST.MF and that should contain Class-Path:util.jar and value for Main-Class attribute.
Now deploy this new ear to your application server and execute it using Application Client Container that comes with your app server.
If you don't want to write another EAR file, then bundle th client.jar in your original EAR file.
Points to note are:
you have to repackage util.jar again inside this ear file.
For portability reason, you should use Class-Path manifest entry in client.jar. Refer to http://java.sun.com/j2ee/verified/packaging.html and J2EE platform spec section #8.2.
Hope this helps,
Sahoo

Bundling in jar file doubt

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