Executing jar file

Is there any way to execute a .jar file without having the JRE installed? I have a jar file that I need to execute on multiple PCs but I can't install the JRE on all of them.
Any help is appreciated, thanks

For any Java program to run, it requires the JRE to be installed on the client computer.
So no, you have the following options:
Go on a mad java-instation spree
Include a link to the JRE for your client to go on a mad java-instation spree
wrap the java application up with an installed that autoinstalls the JRE (InstallAnywhere for example)
Comple the Java application to native http://www.mycgiserver.com/~mrmlk/nativejava.html

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Class not found error while executing jar file

I have written a java code in which i am connecting to database....when i run the class file using......java class_filename it works........
but when i run the jar file using .......java -jar jar_name ...yi gives me the error as 'Class not found'......
can anybody help me please......
Thanks and Regards,
Siddhesh

that class is part of jar file.....in classpath i have included zip files for jdbc ...to get databse connection.....and the jar being executed ................still it gives the error ClassDefnotfound which i think is due to database connection problem.....the exception is raised while.....
Class.ForName("Driver_name").newInstance();/ This driver is present in zip files that i have added in classpath....
above statement doesn,t giv error while i execute the class file............but exception while executing jar file only..
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siddhesh

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

Executable JAR file: Could not find the main class.

Hello,
I have a problem with making an executable JAR file.
I have written a JAVA program that consists of five different classes of which User.java is the main class and I have saved a text document with Main-Class: User and a blank line after that.
If I try:
jar cmf MainClass.txt User.jar User.class Beheerder.class Operator.class Manager.class MaakVisueelSchema.class
it makes a executable jar file which actually works! :)
But when the Operator class trys to open the MaakVisueelSchema class the screen stays blank.
I can run MaakVisueelSchema with java MaakVisueelSchema.
So I tried to make an executable JAR that consists only of MaakVisueelSchema, the same way as I did for User:
Main-Class: MaakVisueelSchema
jar cmf MainClass.txt MaakVisueelSchema.jar MaakVisueelSchema.class
Then I get the error message:
Could not find the main class. Program will exit.
from the Java Virtual Machine Launcher.
The big difference between MaakVisueelSchema and the other classes is that MaakVisueelSchema contains a PaintComponent method and an ComponentListener. Is it possible that one of those creates the error?
Can anyone help me with this problem?
Thanks in advance!
Bye!

Yes,
I tried:
jar xvf MaakVisueelSchema.jar
and it returns:
META-INF/
META-INF/MANIFEST.MF
MaakVisueelSchema.classN/G. You need to manually create a manifest file in a text editor, have it point to your main class, and enter it in your jar command as an argument.

How can I add image files to a executable jar file ?

Could you tell me how can I add image files to executable jar file ?
package structure:
../com/Main.class
../images/..

Please don't cross post, and read this
http://forum.java.sun.com/thread.jsp?forum=31&thread=271751
I've answered the question in the New To Java thread.

Add classpath in an executable jar file

an executable jar file contains a manifest file with entry main-class: MyApplicationClass.
if we double click the jar file on Windows OS, main class is loaded.
my question is:
if classes in he jar file use classpaths which are not default, how to add those classpaths into manifest file to tell classes to use those classpaths?
it is similar to command line:
java -classpath c;\mypackage; .......; MyApplicationClass

Thanks, i will try soon.
here is another Q.
if i need to add tools.jar (JDK lib) as classpath in manifest file, it is as following in my PC
d:\install\java\jdk14101\lib\tools.jar.
but my customers install JDK in different path (should be considered as unknown), how to add it as entry Class-path for all customers?

Classpath is not working for executable jar file

I have created executable jar file using following command where manifest file contains Main-Class and Class-Path entries.
jar cvfm app.jar META-INF/* lib/* *.class
So here app.jar contains my external jar's in lib directory
but when I move app.jar to another directory, it's doesn't get my external files.
I'm not getting this problem as these jar's are in app.jar
class-path entry in manifest file:
Class-Path: lib/abc.jar lib/xyz.jar
Pls help me where it is getting fail?
Thanks in advance,
Vikas

Java doesn't handle jars within jars. Your library jars need to be outside of the executable jar as in
dist - main.jar
- lib - lib1.jar
- lib2.jar

Including a jar file inside an executable jar file

Is it possible to include a jar file inside another (executable) jar file such that the included file is part of the class path for the outer file? If so, how do you specify this in the classpath in the manifest?

Russ_Bjork wrote:
Is it possible to include a jar file inside another (executable) jar file such that the included file is part of the class path for the outer file?No. Actually, I suppose it would be possible if you do all the 'heavy lifting', but Java is not designed to handle Jars within Jars.
What do you see as the advantage of doing that?
Is your app. a rich client (e.g. Swing, AWT, SWT..)?
Can you distribute the app. from a server or the internet?

Main-args in executable Jar file. Possible?

Hello all!
Is it possible to specify arguments for the main class of an executable jar file?
If you call it on the command line this might be possible but what to do if you start the jar with double click?
Any chance?

i don't think so, see http://java.sun.com/docs/books/tutorial/jar/basics/mod.html

Unable to execute JAR files

I am unable to execute jar files and applets. Also, the Java Web Start and the Java Plugin Control Panel will not load. I have unloaded the JRE and installed other versions. To date I have loaded and unloaded the following:
1.4.1
1.4.2_01, _02, _04
1.4.2_04 SDK
But no change in the outcome.
The javaw application starts but does not load the jar file.
The applets and jar files run fine on other computers with any of those JRE/SDK's installed.
Any suggestions would be helpful.

Command line
To create a JAR file >jar cvf filename.jar filename.class(s)
To view the contents of a JAR file >jar tvf filename.jar
To extract the contents of a JAR file >jar xf filename.jar
To extract specific files from a JAR file >jar xf filename.jar archived-file(s)
To run an application packaged as a JAR file
>jar xvf filename.jar META-INF/MANIFEST.MF
The above will place META-INF/MANIFEST.MF file in your working directory. Open this file in text editor. Under Version, type in
Main-Class: filename
example;
Manifest-Version: 1.0
Main-Class: SelectPurchase
Created-By: 1.3.0 (Sun Microsystems Inc.)
save file
update META-INF/MANIFEST.MF file in jar file with;
jar umf META-INF/MANIFEST.MF filename.jarto run jar file from command line;
java -jar filename.jarTo run an application packaged as a JAR file
(version 1.1) jre -cp app.jar MainClass
(version 1.2 -- requires Main-Class
manifest header)
To invoke an applet packaged as a JAR file <applet code=AppletClassName.class
archive="JarFileName.jar"
width=width height=height>
</applet>
Does anyone know how to get the application to run by clicking on a Desktop Icon?

Why i can't execute jar files

Greetings
I read that jar files are executable unpon clicking them, but with me it do nothing.
right now i'm using the command prompt to decompress jar files
jar -xf jarfile.jar
i have windows xp professional with j2sdk1.4.1

You can execute JAR files by double-clicking them if the JAR files have an appropriate manifest and your file associations are set correctly (i.e. make sure you open JAR files with JAVAW.EXE). You can learn more about the manifest here:
http://java.sun.com/docs/books/tutorial/jar/basics/manifest.html

How to create executable jar files??

how to create executable jar files??
thx :)

Using JAR Files to Deploy
http://developer.java.sun.com/developer/onlineTraining/Programming/BasicJava2/jar.html#jar

Error trying to run an executable Jar file

Hi,
I know a million people have asked this before. In the past 5 hours I have waded thru a dozen questions-answers-FAQs that were no help. So if anyone is willing to help a stupid person her is my problem:
I developed a java program using the eclipse ide and it runs fine from within that ide.
I packaged it into a Jar file, created a manifest file per the instructions.
But when I double click on the jar file I get the following error from the Java Virtual Machine Loader;
"Could not find main class. Program will exit."
My Manifest file has the following text:
Manifest-Version: 1.0
Class-Path: swt.jar
Main-Class: .graphicalUserInterface.AppStandAlone
<blank line>
the class AppStandAlone has the method "public static void main(String[] args) "
it is in a package called "graphicalUserInterface".
Any help anyone can give me would be greatly appreciated.

Another 3 hours spent trying to run this java application in a Jar file.
I identified that I did not have all class paths specified. So I tried to enter them in the "Class-Path:" line of the manifest file. But, according to the java tutorial, the syntax in a manifest file for classpaths is a space SEPARATING each path name. I have a space IN the path name and java is not understanding the paths correctly. For instance, I have a classpath c:\Progran Files\Java\etc... and java interprets this to be a classpath c:\Progran with Files\Java\etc as the program I want to run.
I tried enclosing the paths in double quotes. Didn't work
I tried enclosing the paths in single quotes. Didn't work
I tried using a semicolon as a separator with double quotes. Didn't work
I tried using a semicolon as a separator with single quotes. Didn't work
I tried using a semicolon as a separator with no quotes. Didn't work
I removed the "Class-Path:" line from the manifest and tried adding -cp param to the java command. Example:
java -cp %classpath% -jar myapp.jar
I tried all the variations above in the -cp param. None of them worked.
The only thing that works is if I move executable jar file to the same directory as the required libraries. Then I specify a "Class-Path:" line with no spaces in the path names. Obviously this is not a permanent solution.
If anyone else has the patience to help me I would really appreciate it.

Making executable jar file the database using JTable

How can i make an executable jar file if I will use a JTable on my database?Can you tell me how?
Thank you !!

dantte wrote:
in truth, ur question is not clear enough. elaborate on what exactly it is u want, and what u ar truin to achieve.You don't seem to know enough English, let along Java, to be answering questions here.
%

Can't Execute JAR file deployed from JDev 903

Hi Everyone:
I took the Oracle beginning Java class, and got a copy of JDeveloper 9, and started in on a project. The task was to create a small module that will allow users with no direct SQL access to change their Oracle passwords. The good news is that it runs great from within JDev; it catches exceptions cleanly, it handles multiple databases with no problems. The bad news is that I cannot get it to run from a batch file or command line (client is Windows). I have run 'setvars', I have copied the CLASSPATH from the run window in JDev, all to no avail.
I am trying to deploy the app as an executable jar file. It's not meant to be an applet, because of the security implications.
I would gladly RTFM, but the FM's that I have gloss over the deployment step in Jdev. I figure it's something obvious, but I just cannot figure it out.
Any suggestions? Help a newbie...
Thanks,
Mike

Hi Mike,
I suggest you take a look at the log window of JDev, when you've successfully run your project.
If the log window is not displayed, go to View | Log.
Cut the command line, invoking javaw.exe, and paste it into your favorite editor.
Change javaw.exe into java.exe, save your file as a bat file, go in a DOS console, and run the bat file.
Let me know if it fixes your problem.
Thanks,
- Olivier

Prbolem in executing jar file

Hi
I have written a java program that just prints "HAI"
I made that as a executable jar file
But when i am running that jar from DOS, the output is not printing
Please solve my problem
Thanks

gimbal2 wrote:
Kayaman wrote:
Well, normally if your Jar file has a manifest file with the Main-class defined, you wouldn't need to use the -cp switch, in that case
java -jar Sample.jarwould be enough. In fact the -cp flag is ignored when invoking an executable jar; the classpath MUST come from the manifest.This could be a 'cultural difference' in understanding, but it would be more accurate to say the -cp option is ignored if the -jar option is specified. This would mean that the -cp flag is not ignored in this command.
java -cp Sample.jar SampleAnd while I am here, a question for the OP that I am not clear on. The manifest.txt used, does it end with one entirely blank line? (Note that copy/pasting the manifest.txt here will not prove anything, since the forum software will chew up the blank line even if code delimiters are used.) The symptoms of the problem do sound like the JVM is detecting the manifest and successfully reading the main-class attribute, since the stacktrace specifically stated it failed to load Sample.

Executing jar file

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