Jar file question!!urgent help

i created a jar file and i can run it in the dos mode but when run it by double click some functions inside can work!!so what is the problem??
can anyone tell me??

I assume you mean "cannot work".
Did you create the jar file with the manifest file specifying the class (with a main() method) to use?

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Beginner: Can't convert a hello.class file into a jar file. Please Help!!!

Hi, I created a hello.java file, converted into a hello.class file by using the java 2SDk compiler. The problem is that the hello.class file is in a directory I created: C:\JavaBuilder\hello.class
I have a problem converting the hello class file into a jar file. I don't know which approach to take. I've looked at tutorials...but I keep getting more confused each time I view the tutorials on creating jar files. Please can someone help..by taking me through a step by step process. Please be explicit and do not leave or assume that I know any details because I'm a new born beginner. Thank you very much, I seriously appreciate it.

Hi!
first of all, you should use an upper-case character for the first letter of your classes...
To answer your question :
1) you must create a directory named "meta-inf" in your directory "C:\JavaBuilder"
2) then,you must create a file named "manifest.mf" in this directory
it's like a property file and it must contain this :
Main-Class: hello
(don't forget to type <enter> after "hello")
3) in the directory "C:\JavaBuilder", you can enter the following command :
"jar cvfM hello.jar meta-inf\manifest.mf hello.class"
(check jar.exe is in your path)
4) you can run your jar by the command :
"java -jar hello.jar"

Classpath and jar file question

my application need to use few jar files i downloaded from the internet
so i need to set the classpath so that i can import the packages in the jar file rite?
let say set classpath=.;c:\somedir\bin;
the ".;" after the "=" means that i search the current directory first then search the directory i have specified after that rite?
if so, can i put all the needed jar files in the current directory so that my application can use them??
Another question is if all the jar files in located in the same directory how can i set the class path to refer to them without sepecifying each of the jar file name??can i just put the directory path and will it locate them automatically when my application start??
can anyone tell me about it??thanks

No, you need to include each and every jar file in your classpath.
Or put them all in your <jdk_installation_dir>\jre\lib\ext directory, so that they will get included in your classpath automatically.
Sudha

Jar file problem , please help

Hi guys , i am not sure if i am in the right place to have this post in so i'll give it a try
i know my explanation might be a shot in the dark but i'll try my best
i have made a program using eclips , to send emails using my email , on certain conditions
so when that codition happenes on some class in my program
this class will call the email class and send an email to someone
now the problem is not in the program , because as along as this program is in eclips and i run the program in eclips , everything goes fine , No errors what so ever
but , if i make jar file , using eclips "export"
once i run the program , the program would run , but once the same condition that ihave specified previously happenes , the current class never calls the email class , and no emails would be sent
i am very confused wether
1) it throws a class not found for some wierd reason
2) or the external library that i used to send emails , is not exported
i tried to check the CLASSPATH file and i think everything seems to be fine , so i dont know what the problem is
so in short
if the program is in eclips , every thign goes fine
if the program is a jar file , then it would work fine but once it needs to send an email , it never does and i can still work on the program , but no emails will be sent
thanks please some one help me out with this

for more information here is the senario
because i see that you guys are some how lost because i am not providing enough information
so this is a detailed info of the problem
i have 3 classes
1) mybankmain (jframe)
2) mybankbody (all labels and buttons and events included here)
now: within some events in my program ,
it calls a class called.....
3) myEmail
this class imports two things that are comming from an external jar file , so in short , if the external jar file is not available the program would complain
i run this on windows xp (SP2)
now: if this program runs on eclips , it would do everything it is supposed to do and all kind of calculations will be done and emails will be sent on the conditions that i have specified within the program
if i make a jar file on windows , and i run the jar file , the file would work , all functionalities will work
EXCEPT: sending an email
- either my class is not found
- or external jar file is not found which causes my class not to be able to perform its tasks
i did only one test
which is that i switched the main and i made myEmail as a main and i tried to export the jar file
Result: jar file doesnt work
the way i view whatever inside my jar file , i use Winrar and it would view everythign in the jar file and i see that all my classes are included there
if i open my CLASSPATH , i see that there is a pointer to the external jar file
if i open my manifest : i DO NOT see the exrernal jar file in there but i do see that its pointing to my main class
class main : mybankmain
and there is only the version and signiture
i hope all these additional details would help in determining the problem that ihave been trying to solve for 2 weeks now

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

Eclipse, Apache POI, compiling jar file. Please help =(

Hello =) I have written a program in Eclipse using the apache POI library. I have added the POI JAR to my build path and the program runs as it should within Eclipse. Once I export my program to a JAR file, I run it from the command line. Each time I do i get the following error:
{C:\Documents and Settings\Koneko>java -jar "C:\Documents and Settings\Koneko\Desktop\review.jar"
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/poi/poifs/filesystem/POIFSFileSystem" }
I have no idea why this is happening and have searched the internet for hours looking for an answer =\
please help.
-Matt

I usually put them in WEB-INF. But I thought it doesn't matter where they are if you define them correctly in the web.xml file.

MANIFEST file question pls help

Hi,
i have a JAR file on my ftp server. and i want to only read Manifest file informations in this jar file without downloading file on my pc.
is it possible to do this ?
Please help,
Regards,
Musa YILMAZ

thanks,
yes i use zip classes but it always want to cache file to temp directory in windows, i must wait until caching finishes
but my jar file is 5mb so i wait so long,
also caching is as same as downloading file.
but if not necessary i wont download file.
but i think it is not possible.
Regards,
Musa YILMAZ

Execution from JAR files and Classpaths -- Help

I am confused about how classes are resolved when running from within a JAR file, and why this is different than running a class that is not inside a JAR file.
I have an application that uses classes from a third party library stored in a JAR file (biojava.jar) . If I run the app from the class file it works as expected and is capable of finding the external classes when the path to the biojava.jar is on my classpath. It also works if biojava.jar is instead placed in the extensions folder jre/lib/ext folder without an explicit path entry in my classpath.
However when I package all my application classes up in a JAR file and try to execute the application from the JAR file it will ONLY work if I add a manifest entry to myApp.jar ... Class-Path: biojava.jar AND I place the file biojava.jar in the SAME directory as the Packaged JAR application. I would like to find a way to make this JAR file work for anyone who has biojava.jar in their classpath or ext directory. In other words I don't want my user community to have to copy the biojava.jar file when I email them myApp.jar. This community will already have biojava.jar on their CLASSPATH.
How can I make my app within a JAR recognize either the user's CLASSPATH or ext folder? I have tried reading the documentation and many experiments but the only way it works is as described above.
I am running Running Windows 2000.
java version "1.4.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_01-b01)
Java HotSpot(TM) Client VM (build 1.4.1_01-b01, mixed mode)
Here are the results of my experimentations:
The following Works:
Manifest: Main-Class: org/biojava/app/SequenceSpiral
Manifest: Class-Path: biojava.jar
Place biojava.jar in the same directory as SequenceSpiral.jar
java -jar SequenceSpiral.jar
This works perfectly
NONE of the following work
0) Placing biojava.jar in my jre/lib/ext directory instead of the same dir as SequenceSpiral.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/biojava/bio/seq/FeatureFilter
(this is the first class referenced from biojava.jar)
1) Just see if it will find the proper jar on my classpath
Manifest: Main-Class: org/biojava/app/SequenceSpiral
I have biojava.jar on my classpath but not in same directory as SequenceSprial.jar
java -jar SequenceSpiral.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/biojava/bio/seq/FeatureFilter
2) Specify the name if the jar in the Manifest Classpath and see if it will find the proper jar on my classpath
Manifest: Main-Class: org/biojava/app/SequenceSpiral
Manifest: Class-Path: biojava.jar
I have biojava.jar on my classpath but not in same directory as SequenceSprial.jar
java -jar SequenceSpiral.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/biojava/bio/seq/FeatureFilter
3) Specify the path of the jar in the Manifest Classpath
Manifest: Main-Class: org/biojava/app/SequenceSpiral
Manifest: Class-Path: d:/biojava/biojava.jar
I have biojava.jar on my classpath (D;\biojava\biojava.jar) but not in same directory as SequenceSprial.jar
java -jar SequenceSpiral.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/biojava/bio/seq/FeatureFilter
(note that in this case it is not fnding my main even though the Main-Class is specified)
4) Specify current directory and biojava.jar in the Manifest Class-Path
Manifest: Main-Class: org/biojava/app/SequenceSpiral
Manifest: Class-Path: .;biojava.jar
I have biojava.jar on my classpath (D;\biojava\biojava.jar) but not in same directory as SequenceSprial.jar
java -jar SequenceSpiral.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/biojava/bio/seq/FeatureFilter
5)Specify current directory and the URL of biojava.jar in the Manifest Class-Path
Manifest: Main-Class: org/biojava/app/SequenceSpiral
Manifest: Class-Path: . d:/biojava/biojava.jar
I have biojava.jar on my classpath (D;\biojava\biojava.jar) but not in same directory as SequenceSprial.jar
java -jar SequenceSpiral.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/biojava/bio/seq/FeatureFilter.
Thank you very much for any help or suggestions,
David Maynard

I did some more testing and I think I now understand what is going on.
I don't like it, but at least I understand it.
The problem: I have an app packaged into a JAR file, myApp.jar. It has a dependancy upon an external JAR file extern.jar.
extern.jar is on my Classpath (and also in jre/lib/ext)
1) For some reason (bug?) java -jar myApp.jar does NOT use the classpath or the jre/lib/ext mechanisms to find .jar files needed to resolve references to external classes. This seems to be true even if you add an explicit -classpath argument on the command line!
thus
java -jar -cp c:\\absolutePathToMy\extern.jar myApp.jar
also fails as does
java -cp c:\\absolutePathToMy\extern.jar -jar myApp.jar
2) Inside the myApp Jar file you can specify a URL to an jar extension jar file but the URL IS RELATIVE TO THE PATH WHERE THE myApp.Jar is executed from! If I add the Manifest item Class-Path: ..\..\..\myexterndir\extern.jar then
java -jar myApp.jar
works correctly and resolves the external references.
This is why several people have reported that this class-path mechanism works ONLY when the extern.jar file is in the SAME DIRECTORY as the myApp.jar file when they had added a Class-Path: extern.jar to the Manifest.
However together these two items make it IMPOSSIBLE to distribute myApp.jar to others and have it work since the path names statically encoded inside the jar are relative to where the jar gets executed from. If I move myApp.jar to a different location on my hard drive it may also fail.
In my case I know all my customers already have extern.jar (5MB) installed on their classpaths and I would like to just send them the myApp.jar ( .5MB ).
However I don't see how to do this given the current specification of a JAR file, and the bug that makes all -jar file act like they have the Sealed=true property.
I tried explicity setting Sealed=false in the manifest but this didn't seem to have any effect.
I hope that this will save others the many hours of time it has taken be to determine that JARS are not well suited for deploying apps with dependenncies on external libs.
I also hope that someone can show me how execute a JAR and specify a classpath that doesn't get IGNORED my the classloader used in loading the jar classes.
This is using java version:
java version "1.4.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_01-b01)
Java HotSpot(TM) Client VM (build 1.4.1_01-b01, mixed mode)
Does any one know this bug is fixed in a later release?
David Maynard

Signing a jar file question

Hello folks
Have a tough one here. We have a Legacy System that uses some 3rd party software called Reflections For Web (RWeb) from Attachmate in order to allow the Legacy System to interface with a mainframe system. One of the files needed by this RWeb software is a jar file called KeyToolsPro_jce1-2-1_signed.jar which itself was created by another company. The problem we are having is that due to the security changes in Java 7u51 this file is blocked due to not having the appropriate manifest entries and due to being signed by an unknown certificate CA. This problem is compounded by the fact that the company that created the file is no longer in business and as such cannot make the changes needed to the manifest file. Also the problem with the signature it seems is due to it being a cryptographic file it needs to be signed by a JCA code signing CA which is not recognized by the AF. This page talks about signing it with either a Sun or IBM JCA code signing CA:
http://docs.oracle.com/javase/7/docs/technotes/guides/security/crypto/HowToImplAProvider.html#integritycheck
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Thanks in advance.

You can add a manifest to a jar file like this:
jar ufm MyJar.jar manifest.txt
You'll then need to resign the JAR. You'll need a code-signing certificate for this. You can obtain a real one from a provider, or generate your own CA and use it to sign a code-signing certificate yourself.
You can add a CA to the trusted list like this:
C:\Program Files (x86)\Java\jre7\lib\security>keytool -importcert -alias MyCA -file c:\cacert.cer -keystore cacerts -storepass changeit -noprompt
where c:\cacert.cer is the certificate for the CA.
However, it may be easier to add your internal server to the exceptions list using the Java control panel.

ADF faces jar files needed (urgent)

Hi,
I have downloaded one sample adf faces application from oracle site, but it does not have the jar files. They are saying that you can download the neccassary jar files from the Oracle Technology Network (OTN) Web site as a .zip archive that contains the tag libraries, documentation, and a Web application example.
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I have downloaded the sample appl from the following link..
http://www.oracle.com/technology/pub/articles/cioroianu_jsfadf_v4.html
Thanks in advance..
Regards,
Saravanam

Hi,
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The newer - production class - ADF Faces jar files are not for download separately but are part of Oracle JDeveloper and available in its jlib directory. So you could go download JDeveloper and get adf-faces.jar
Frank

How can i set the dos can compile and excute the jar file?please help?

How can i set the dos prompt can compile my .java file and execute my jar file.

Go to where you downloaded your Java SDK. Look around for a button labled "Installation." Click the button. Download the installation instructions. Read them. Then read them again.

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I have an iPod video 30GB, i downloded the latest iTunes & Quicktime version, and updated my iPod also to the latest update. When i connect my iPod and start downloading music from the library in iTunes, the iPod keeps on disconnecting and restarting by itself, and i get a message that the file iTunes.exe is corrupt. I tried Apple support and did all what they said by downloading the latest updates and versions, and also did the Chkdsk utility on Windows, but still it did not work, the iPod keep on restarting and i cannot download anything on it, i had it now for a week and did not use it at all because of this problem, can somebody with a technical background help me please, i use Windows XP.

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Hey guys.
I'm going to be getting a new iTouch tomorrow cuz mine is broken (I LOVE APPLE! Much better customer support and help than PC!)
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Simple question, Urgent help needed.(Session Related)

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null? or something else?
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* Standard Post Method for Processing the HTML Variables
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Jar file question!!urgent help

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