Unzipping jar files

i all i have downloaded the apache package to upload files using jsp/servlets. it is a jar file and i placed it in the lib(WEB-INF/lib) directory. my program that calls the package is in the /WEB-INF/classes file and when i try to compile the file i get errors because the program is unable to locate the apache package which is in a jar format. what do i need to do to make use of that package? do i need ot unzip the package or give some kind of class path to the jar file while compiling? please help

you just need to make sure that the apache .jar file is on the classpath when you try to compile your classes.
you will also need it on the classpath at runtime.

Similar Messages

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

Protect jar file from unzip utility

Hi
I have an application in .jar file and I don't want that the client
can extract or unzip and see the contents of my .jar file.But still the .jar file
could run by mouse double click or java -jar command.
Anyone can give me an idea how to do it.
Thanks...

If java can read it on your client's machine, the client can read it. There is no way to prevent this. Here's the general cycle:
int protectionMode = chooseProtectionMode();
boolean haveCustomers = true;
while (haveCustomers)
switch (protectionMode)
    case OBFUSCATE:
      //You can obfuscate your code to make it (marginally) harder to
      //reverse-engineer. If your client is really interested in your
      //code, this won't keep them from figuring out what it does.
      break;
    case ENCRYPT:
      // You can encrypt most of your class files, and build a
      // decrypting classloader, and build a framework that calls
      // the decrypting classloader to get at the rest of the jar.
      // Of course, your client can just arrange to call your
      // classloader from their own, and write the (decrypted)
      // classfiles to disk, and then reverse engineer them.
      protectionMode = OBFUSCATE;
      break;
    case STATECHECK:
      // You can put some kind of check in your decrypting classloader
      // that calls System.exit() if it discovers it's being called in
      // such an unfriendly way. Your client will take about 10 minutes
      // to find and remove the check.
      protectionMode = ENCRYPT;
      break;
    case REMOTE:
      // You can keep your code on your server and let the client run
      // something that talks to it. The client will complain
      // vociferously, and refuse to use your app.
      haveCustomers = false;
      break;
    default:
      // You can decide to stop stressing over something you can't
      // help, and write code that people will buy
}(Sorry - in an odd mood, seen this question or one like it too often recently, not enough sleep...)

To how unzip trsuted applet jar file

hi to all,
I have created a trusted applet signed jar file.Now now i want to unzip the this jar file..but i am unable to do it......
so please help me
Thanks and Regards

Yes, I thought you would not like that answer. If you want a better answer, ask a better question. Provide useful information like what you have tried, what error messages you are getting, and so on. "I am unable to do it" is not useful information.

NEED HELP PLEASE!!!! Not unzipping but executing .jar file on iPhone

I am in need of help, Please, there has to be someone who knows how to do this!
OK On iphone 4s, I used winzip to extract a .jar file but I am unable to open and use the actual file.
This was expensive purchase and this is a time issue.
Thank You Very Much!!!!

You can't, .jar is a Java archive, iOS doesn't have a java virtual machine.

Can not open JAR file?

Hello,
My friend and I are working on a Calculus Project in which he made a Java applet that shows how a function's derivative is found... regardless! He made this file on a Linux based computer and saved it as a .jar file and sent to me via email. I downloaded the file and double clicked it, but the file didnt open, instead it displayed this message:
"The Java JAR File "Calc_Deriv.jar" could not be launched.
Please check the console for possible errors"
I checked the console, and to be honest I had absolutely no clue what I was looking at. Here were the messages from the last 10 minutes.
Code:
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] SystemFlippers: didn't consume all data for long ID 0 (pBase = 0x10012fc90, p = 0x10012fc94, pEnd = 0x10012fc98)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] SystemFlippers: didn't consume all data for long ID 0 (pBase = 0x1001116f0, p = 0x1001116f4, pEnd = 0x1001116f8)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] Exception in thread "main"
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] java.lang.NoClassDefFoundError: org/jdesktop/application/SingleFrameApplication
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.lang.ClassLoader.defineClass2(Native Method)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.lang.ClassLoader.defineClass(ClassLoader.java:774)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:160 )
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.net.URLClassLoader.defineClass(URLClassLoader.java:254)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.security.AccessController.doPrivileged(Native Method)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280)
12/15/09 6:01:11 PM [0x0-0x10d10d].com.apple.JarLauncher[3275] at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
I do not know where to start, nor where to end, nor what I am looking for. But essentially I simply need to open this file and see what is inside.
--System--
Model Name: MacBook Pro
Model Identifier: MacBookPro4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP41.00C1.B03
SMC Version (system): 1.27f2
Serial Number (system): W8**T1YJX
Hardware UUID: 9FC62D3C-021A-5C2A-9197-134226381FE9
Mac OSX 10.5.8
Thank you very much for the help!

In a Terminal session you could try something like
unzip -l path/to/jar/file
Dave

Error while compiling Web Dynpro program due to missing JAR files

Hi Experts,
I am getting error message while compiling Web Dynpro program. The erring lines are as below:
          Message message = new MimeMessage(session);
          try {
               message.setFrom(new InternetAddress(fromMailId));
               message.addRecipient(
                    Message.RecipientType.TO,
                    new InternetAddress(toMailId));
               message.setSubject(mailSubject);
               message.setText(mailBody);
               message.setHeader("X-Mailer", "E-Mail");
               message.setSentDate(new Date());
               Transport.send(message);
The error messages are:
Message.ReceipientType can not be resolved
The method send(Message) is undefined for the type Transport
The method setFrom(InternetAddress) is undefined for the type Message
The method setHeader(String, String) is undefined for the type MessageThe method setSentDate(Date) is undefined for the type Message
The method setSubject(String) is undefined for the type Message
The method setText(String) is undefined for the type Message
Type mismatch: cannot convert from MimeMessage to Message
Can you please help me in resolving the issue. It seems that some API is missing. I believe if some one can tell me the name of JAR file / API then I will be able to sort out the issue. I will add these JAR file in my program.
Thanks,
S

HI Stuart,
you are missing the jar files required for sending mail in java
Installing JavaMail
You will need the latest version of JavaMail (Version 1.2) available here:
http://java.sun.com/products/javamail/
Download and unzip the file, in the newly created top level JavaMail directory you will find a number of jar files,
these need adding to your classpath.
To do this in Eclipse, right click on your project in the tree view, select properties, select the libraries tab.
Now click the 'Add external jars' button, navigate to your JavaMail directory and click on the jars.
The tutorial also makes use of the Java Activation Framework, which is available here:
http://java.sun.com/products/javabeans/glasgow/jaf.html
Instalation of JAF is identical to JavaMail
activation.jar / mail.jar are 2 distinct names i remember rest you will get above
P.S: close the question to assist other users narrow the search and find solutions
Message was edited by:
        Armin Reichert

Problem with images in .jar file

Hi all!
I've got a severe problem when deploying an application via web start:
the images withhin a deployed .jar file are not found.
So far I've tried a number of things to get the images back, none of which are working.
I've found different threads concerning this topic, e.g.:
http://forum.java.sun.com/thread.jspa?threadID=396363
http://forum.java.sun.com/thread.jspa?threadID=465795&messageID=2141351
but sadly, they didn't help me out.
Here is my code I'm using:
private ImageIcon loadIconFromClassLoader(String tszRelPath)
    ImageIcon tIcon = null;
    cCat.info("tszRelPath = "+ tszRelPath);
    // this line simply leads to a crash of the whole application
    //tszRelPath = tszRelPath.replaceAll("\\", "/");
    if(!tszRelPath.startsWith("/"))
      tszRelPath = "/" + tszRelPath;
    cCat.info("modified tszRelPath = " + tszRelPath);
    URL tURL = ClassLoader.getSystemResource(tszRelPath);
    if(tURL == null)
      // this too crashes my application
      //tURL = PlainResourceProvider.class.getResource(tszRelPath);
    if(tURL != null)
      tIcon = new ImageIcon(tURL);
    return tIcon;
}I've also tried
PlainResourceProvider.class.getClassLoader().getResource()PlainResourceProvider is part of the .jar that involves the images.
Of course all the .class files in the .jar file are easily accesible
I would be so thankful, if just anyone could help me to solve this problem.
I am going crazy.
Thanks in advance, Christoph

You should take care of the directory structure according to the package structure.
I for example have this jar:
C:\source\java\ebank2_util\smsunlock>unzip -l pro-ebank_sms_unlock.jar
Archive: pro-ebank_sms_unlock.jar
Length    Date    Time    Name
      0 10-28-05 17:27   hu/
      0 10-28-05 17:27   hu/khb/
      0 10-28-05 18:17   hu/khb/smsunlock/
    256 11-07-05 16:33   hu/khb/smsunlock/DButils$MySQLException.class
   4229 11-07-05 16:33   hu/khb/smsunlock/DButils.class
   1700 11-07-05 16:33   hu/khb/smsunlock/GUI$1.class
   2318 11-07-05 16:33   hu/khb/smsunlock/GUI$2.class
    988 11-07-05 16:33   hu/khb/smsunlock/GUI$3.class
   1402 11-07-05 16:33   hu/khb/smsunlock/GUI$mywl.class
   5630 11-07-05 16:33   hu/khb/smsunlock/GUI.class
    818 11-07-05 16:33   hu/khb/smsunlock/LimitedLength_TextField.class
   2452 11-07-05 16:33   hu/khb/smsunlock/Main.class
    900 11-07-05 16:33   hu/khb/smsunlock/MyInputStream.class
      0 11-07-05 16:33   META-INF/
     98 10-27-05 15:53   META-INF/manifest.mf
     90 11-07-05 16:33   hu/khb/smsunlock/properties
20881                    16 filesAnd the resource is loaded like this from hu.khb.smsu.Main:
InputStream is = new MyInputStream( Main.class.getResourceAsStream( "properties" ) );

Extract JAR file to a different directory

Is it possible to use the jar command to extract the content of a JAR file to a different directory (not the current directory)?
I want to use this command inside a makefile, looking for the same effect as "unzip example.jar -d directory".
Thanks in advanced.

Thanks Chuck, you solved my doubt... It surprises me that JAR doesn't support this option.
I used the "unzip" command inside the makefile instead, but I wanted to be sure that there wasn't any chance to use "jar" (without using the additional script file).

Jar files to add to the classpath for KM development.

Hello Friends:
I am trying to retrieve the favorites of the user stored
under him home folder. In KM we have a readymade iview,
called 'Favorites'. I am programmatically trying to
read the values stored by this iview.
I am using NWDS 2.0.5 on EP60SP2Patch3. When I use the
following code,
IUserManagementService umService =
(IUserManagementService) request.getService(IUserManagementService.KEY);
// get the user object
IUser user =
umService.getDefaultFactory().getUser(userId);
IResourceContext context = new ResourceContext(user);
in my IDE I get the following error:
"This compilation unit indirectly references a missing
type com.sapportals.portal.security.usermanagement.
IUserFactory"
The following are the jar files added to my project's
classpath.
com.sap.portal.usermanagementapi.jar
com.sap.portal.usermanagementcore.jar
com.sap.portal.usermappingapi.jar
com.sap.security.api.jar
com.sap.security.api.perm.jar
com.sap.security.core.jar
com.sap.security.core.tpd.jar
apart from the usual portal framework related jar files.
I tried also to add all the jar files with the prefix like...
com.sap.km.*
com.sap.netweaver.bc.*
It didn't help.
What are the other jar files I need to add, and where
they are available.
BTW, I unzipped all the 'portallibs' downloaded from the
portal and using those jar files to attach to the project.
Thank you very much,
Prasad Nutalapati

Hi Prasad,
additionally you need com.sap.security.api.ep5.jar due to the fact that KM is using the old EP5 usermanagement libraries.
Concerning the KM / RF libraries I would recommand to include all libraries matching the patterns bc._api.jar and km._api.jar
Best regards,
Thilo

How to compress a bunch of .java files into a single .jar file?

Hello everyone! I am working on a Chinese segmentation job. Someone offers very excellent
such tool. When I copy his example, I find it imports
          import org.apache.lucene.analysis.Analyzer;
          import org.apache.lucene.analysis.Token;
          import org.apache.lucene.analysis.TokenStream;
          import org.mira.lucene.analysis.IK_CAnalyzer;I have downloaded IK_CAnalyzer.jar file which contains org.mira.lucene.analysis.IK_CAnalyzer class.
I find that I need to download lucene, thus I went into the following website
http://lucene.apache.org/#06+May+2008+-+Lucene+Java+2.3.2+availableand downloaded the lucene-2.3.2-src.tar.gz. Aftre unzip, I found all java source files in java directory (and in many other different subdirectories). Now it seems I need to compile all the src files and compress them into a single .jar file while keeping their original hierarchy unchanged
I think I should use jar command and with some additional options.
Can anyone show me how to do that?
Many thanks!
Edited by: aaron9979215 on Jul 12, 2008 5:17 AM

Thanks for reply, I?ve read that tutorial before I post. Howevver, it do tells how to compress a jar file.
The question I have is how to compile two .java file stored in different packages like
rootPackage-->subPackage-->a.java
rootPackage-->subPackage2-->b.java
I want to compile a,java and b.java both and keep their hierarchy like rootPackage.subPackage.a unchanged. If I directly go into subPackage and compile a.java, I think the hierarchy is changed.
What do you think about it?

Jar file in web-inf\lib is not being loaded - weblogic 7.0

I am callling a webservice from a jsp. everything works fine if I keep the interface
classes under web-inf\classes....but If I put the interface classes in a jar file
and put it under web-inf\lib, then weblogic does not seem to find that....
I am getting following error :
C:\bea\user_projects\mydomain\.\myserver\.wlnotdelete\_appsdir_omccs_example_war_omccs_example_4653011\jarfiles\WEB-INF\lib\Customer_client32432.jar(com/qwest/omccsexample/ejb/CustomerBean/CustomerValue.java):14:
class CustomerValue is public, should be declared in a file named CustomerValue.java
(source unavailable)
C:\bea\user_projects\mydomain\.\myserver\.wlnotdelete\_appsdir_omccs_example_war_omccs_example_4653011\jarfiles\WEB-INF\lib\Customer_client32432.jar(com/qwest/omccsexample/ejb/CustomerBean/CustomerValue.java):119:
cannot resolve symbol
symbol : class RuntimeUtils
location: package binding
(source unavailable)
C:\bea\user_projects\mydomain\.\myserver\.wlnotdelete\_appsdir_omccs_example_war_omccs_example_4653011\jarfiles\WEB-INF\lib\Customer_client32432.jar(com/qwest/omccsexample/ejb/CustomerBean/CustomerValue.java):120:
cannot resolve symbol
symbol : class RuntimeUtils
location: package binding
(source unavailable)
C:\bea\user_projects\mydomain\.\myserver\.wlnotdelete\_appsdir_omccs_example_war_omccs_example_4653011\jarfiles\WEB-INF\lib\Customer_client32432.jar(com/qwest/omccsexample/ejb/CustomerBean/CustomerValue.java):121:
cannot resolve symbol
symbol : class RuntimeUtils
location: package binding
(source unavailable)
4 errors
Wondering if it is a bug...?
any thoughts ?
-Girish Bhatia

I wrote up a simple test case for this and it works fine for me.
I suppose there are diffences. ;)
I am using:
WebLogic Server 7.0 SP1 Mon Sep 9 22:46:58 PDT 2002 206753
Take the attached zip, unzip.
cd to directory
ant build
then deploy it via the console, or
java weblogic.Deployer -adminurl t3://127.0.0.1:7001 -user weblogic -password
weblogic -activate -name mywebapp2 -source e:/weblogic/dev/sandbox/griffith/apps/output/exploded_mywebapp_lib/
Then:
http://c863775-d:7001/exploded_mywebapp_lib/frobber
works for me. My servlet implments an interface in the jar in my lib dir.
Cheers
mbg
"Girish" <[email protected]> wrote:
>
I am callling a webservice from a jsp. everything works fine if I keep
the interface
classes under web-inf\classes....but If I put the interface classes in
a jar file
and put it under web-inf\lib, then weblogic does not seem to find that....
I am getting following error :
C:\bea\user_projects\mydomain\.\myserver\.wlnotdelete\_appsdir_omccs_example_war_omccs_example_4653011\jarfiles\WEB-INF\lib\Customer_client32432.jar(com/qwest/omccsexample/ejb/CustomerBean/CustomerValue.java):14:
class CustomerValue is public, should be declared in a file named CustomerValue.java
(source unavailable)
C:\bea\user_projects\mydomain\.\myserver\.wlnotdelete\_appsdir_omccs_example_war_omccs_example_4653011\jarfiles\WEB-INF\lib\Customer_client32432.jar(com/qwest/omccsexample/ejb/CustomerBean/CustomerValue.java):119:
cannot resolve symbol
symbol : class RuntimeUtils
location: package binding
(source unavailable)
C:\bea\user_projects\mydomain\.\myserver\.wlnotdelete\_appsdir_omccs_example_war_omccs_example_4653011\jarfiles\WEB-INF\lib\Customer_client32432.jar(com/qwest/omccsexample/ejb/CustomerBean/CustomerValue.java):120:
cannot resolve symbol
symbol : class RuntimeUtils
location: package binding
(source unavailable)
C:\bea\user_projects\mydomain\.\myserver\.wlnotdelete\_appsdir_omccs_example_war_omccs_example_4653011\jarfiles\WEB-INF\lib\Customer_client32432.jar(com/qwest/omccsexample/ejb/CustomerBean/CustomerValue.java):121:
cannot resolve symbol
symbol : class RuntimeUtils
location: package binding
(source unavailable)
4 errors
Wondering if it is a bug...?
any thoughts ?
-Girish Bhatia
[mywebapptest.zip]

Java Access Helper Jar file problem

I just downloaded Java Access Helper zip file, and unzipped, and run the following command in UNIX
% java -jar jaccesshelper.jar -install
I get the following error message, and the installation stopped.
Exception in thread "main" java.lang.NumberFormatException: Empty version string
at java.lang.Package.isCompatibleWith(Package.java:206)
at jaccesshelper.main.JAccessHelperApp.checkJavaVersion(JAccessHelperApp.java:1156)
at jaccesshelper.main.JAccessHelperApp.instanceMain(JAccessHelperApp.java:159)
at JAccessHelper.main(JAccessHelper.java:39)
If I try to run the jar file, I get the same error message.
Does anyone know how I can fix this?
Thanks

Cross-posted, to waste yours and my time...
http://forum.java.sun.com/thread.jsp?thread=552805&forum=54&message=2704318

Native extension to unzip a file crash my air app

Hello,
I have a problem with a native extension for android
I want to unzip a file
my java code
File f = new File("my zip file");
File outputDir = new File ("output folder");
ZipHelper.unzip(f, outputDir);
and
import java.util.zip.*;
import java.io.*;
import java.util.Enumeration;
import org.apache.commons.io.IOUtils;
import android.util.Log;
public class ZipHelper
static public void unzip(File archive, File outputDir)
try {
Log.d("control","ZipHelper.unzip() - File: " + archive.getPath());
ZipFile zipfile = new ZipFile(archive);
for (Enumeration e = zipfile.entries(); e.hasMoreElements(); ) {
ZipEntry entry = (ZipEntry) e.nextElement();
unzipEntry(zipfile, entry, outputDir);
catch (Exception e) {
Log.d("control","ZipHelper.unzip() - Error extracting file " + archive+": "+ e);
static private void unzipEntry(ZipFile zipfile, ZipEntry entry, File outputDir) throws IOException
if (entry.isDirectory()) {
createDirectory(new File(outputDir, entry.getName()));
return;
File outputFile = new File(outputDir, entry.getName());
if (!outputFile.getParentFile().exists()){
createDirectory(outputFile.getParentFile());
Log.d("control","ZipHelper.unzipEntry() - Extracting: " + entry);
BufferedInputStream inputStream = new BufferedInputStream(zipfile.getInputStream(entry));
BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile));
try {
IOUtils.copy(inputStream, outputStream);
catch (Exception e) {
Log.d("control","ZipHelper.unzipEntry() - Error: " + e);
finally {
outputStream.close();
inputStream.close();
static private void createDirectory(File dir)
Log.d("control","ZipHelper.createDir() - Creating directory: "+dir.getName());
if (!dir.exists()){
if(!dir.mkdirs()) throw new RuntimeException("Can't create directory "+dir);
else Log.d("control","ZipHelper.createDir() - Exists directory: "+dir.getName());
i copy the file commons-io-2.4.jar (I get at http://commons.apache.org/proper/commons-io/download_io.cgi) in the lib folder of eclipse.
in a native android app, this code work fine
in a native extension for air, my air app crash
LogCat in eclipse return
NoClassDefFoundError: org.apache.comons.io.IOUtils.copy
IOUtils class is not in commons-io-2.4.jar ???
thanks

Hello,
I have a problem with a native extension for android
I want to unzip a file
my java code
File f = new File("my zip file");
File outputDir = new File ("output folder");
ZipHelper.unzip(f, outputDir);
and
import java.util.zip.*;
import java.io.*;
import java.util.Enumeration;
import org.apache.commons.io.IOUtils;
import android.util.Log;
public class ZipHelper
static public void unzip(File archive, File outputDir)
try {
Log.d("control","ZipHelper.unzip() - File: " + archive.getPath());
ZipFile zipfile = new ZipFile(archive);
for (Enumeration e = zipfile.entries(); e.hasMoreElements(); ) {
ZipEntry entry = (ZipEntry) e.nextElement();
unzipEntry(zipfile, entry, outputDir);
catch (Exception e) {
Log.d("control","ZipHelper.unzip() - Error extracting file " + archive+": "+ e);
static private void unzipEntry(ZipFile zipfile, ZipEntry entry, File outputDir) throws IOException
if (entry.isDirectory()) {
createDirectory(new File(outputDir, entry.getName()));
return;
File outputFile = new File(outputDir, entry.getName());
if (!outputFile.getParentFile().exists()){
createDirectory(outputFile.getParentFile());
Log.d("control","ZipHelper.unzipEntry() - Extracting: " + entry);
BufferedInputStream inputStream = new BufferedInputStream(zipfile.getInputStream(entry));
BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile));
try {
IOUtils.copy(inputStream, outputStream);
catch (Exception e) {
Log.d("control","ZipHelper.unzipEntry() - Error: " + e);
finally {
outputStream.close();
inputStream.close();
static private void createDirectory(File dir)
Log.d("control","ZipHelper.createDir() - Creating directory: "+dir.getName());
if (!dir.exists()){
if(!dir.mkdirs()) throw new RuntimeException("Can't create directory "+dir);
else Log.d("control","ZipHelper.createDir() - Exists directory: "+dir.getName());
i copy the file commons-io-2.4.jar (I get at http://commons.apache.org/proper/commons-io/download_io.cgi) in the lib folder of eclipse.
in a native android app, this code work fine
in a native extension for air, my air app crash
LogCat in eclipse return
NoClassDefFoundError: org.apache.comons.io.IOUtils.copy
IOUtils class is not in commons-io-2.4.jar ???
thanks

When to use JAR files

We are having a discussion at work about the proper usage of jar files. I am fairly opinionated and need to get some good feedback on when jar files make sense.
Network:
We have a unix based network as well as a windows based network. We can share samba mounted drives and allow windows access to the class files on the unix network. Most of our internal webservers are on the unix platform.
We use java in applications, servlets, and JSP's. We have also designed an electronic technical manual that will be deployed via internet and cd rom.
My first contention that jar files are not needed in the Servlet environment. The class files are virtually local and file storage is not an issue.
My second contention is that applications running on windows machines would have better performance from local jar files, but the benefits are outweighed by the need to rebuild and reinstall the jar files to ensure the applications behaved the same on both systems.
My third contention is that the technical manual on cd is a very good candidate for use of jars. We have a limited amount of space to store the files on a cd. We would probably use the jars to serve the information to ensure the behavior of the manual is the same whether the application was access via the CD or the internet.
What am I missing? Is my understanding of JAR files out of whack with reality?

Jar files (and their siblings i.e. Wars, Ears) make a
good unit of deployment. It is much easier to keep
track of a few jars than a bunch or classes.We have classes which are used in several applications. Ie, A bean queries our bill of material. It is used in an engineering, a manufacturing and a planning application. It can also be used in a jsp. If that bean changes, we would have to deploy three new jar files. If we run from one directory structure, a simple compile fixes all three applications.
With the samba mounts, we can get to the directory from windows and most flavors of unix.
We actually have two directory structures. One for production and one for test. Developers usually have another copy stashed somewhere for development purposes.
I don't know where you get better performance. The
jar needs to be unzipped which can only slow
performance. Rebuilding a jar is easy (get Ant) and
reinstalling a jar is easier than installing a buch of
class files and resources (see above.) In addition,
you can seal jars which gives you some level of
protection (though superficial) and you can set up the
jar so that it knows the main class.For the most part, these are internal applications, so security is not the top priority. Jars would be nice as they should generate less network traffic due to their smaller size.
A jar is really just a zip file with a special
structure. This is really a question of whether you
need compression. If you can't fit everything onto a
single CD then compression can help. A plain old zip
file would work just as well.The compression is the main reason for the techpub application using the jar files. Space on the CD is a concern. Also, for internet access, bandwidth is also a concern. IE, less bits to shove down the wire.
Like I said before jars are a convienient way to keep
things organized. You can send out a program in a
single unit that has everything it needs to run.I have an aversion to anything which requires an install on the users box. This probably comes from working with a bunch of unix hacks that have our system tuned to the nth degree. Much easier to deploy to one central location. No worries about whether or not someone turned their machine off before the nightly push, who has admin rights, etc. Map to the drive and you are off and running. One big performance hit is running the jvm from a shared drive. The JVM should be installed locally.

Unzipping jar files

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