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Posted to user@ant.apache.org by Ir...@t-systems.com on 2008/06/18 09:25:42 UTC
unable to execute JAR file
Hi All,
I have 10 java files and I have written Ant build.xml to compile and
create JAR file which contains the .class files. Now my requirement is
that I need to execute/install the JAR file but unfortunately I can't do
this as I am getting following error.
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>java -jar
test.jar
Failed to load Main-Class manifest attribute from
test.jar
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>
Please find the attached java code and build script.
Please help
Regards
Irfan.
Re: unable to execute JAR file
Posted by Prashant Reddy <pr...@pramati.com>.
Google is your friend.
http://www.google.co.in/search?q=Failed+to+load+Main-Class+manifest+attribute
The first hit from the search result has this link to Java tutorial :
http://java.sun.com/docs/books/tutorial/deployment/jar/basicsindex.html
To execute a jar using 'java' command, the JAR file needs to have a
MANIFEST.MF file with entry 'Main-Class'.
The value of this entry must be the fully qualified class name which has
the main() function.
-Prashant
Irfan.Sayed@t-systems.com wrote:
>
> Hi All,
>
> I have 10 java files and I have written Ant build.xml to compile and
> create JAR file which contains the .class files. Now my requirement is
> that I need to execute/install the JAR file but unfortunately I can’t
> do this as I am getting following error.
>
> D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>java -jar
> test.jar
>
> Failed to load Main-Class manifest attribute from
>
> test.jar
>
> D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>
>
> Please find the attached java code and build script.
>
> Please help
>
> Regards
>
> Irfan.
>
> ------------------------------------------------------------------------
>
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Re: unable to execute JAR file
Posted by Ognjen Blagojevic <og...@rcub.bg.ac.yu>.
Irfan.Sayed@t-systems.com wrote:
> I have 10 java files and I have written Ant build.xml to compile and
> create JAR file which contains the .class files. Now my requirement is
> that I need to execute/install the JAR file but unfortunately I can’t do
> this as I am getting following error.
...
> Failed to load Main-Class manifest attribute from
You should read a bit about manifest files. See this link[1].
In short, JVM doesn't know which class has the main method to be used as
the entry point to your application.
-Ognjen
[1]
http://java.sun.com/docs/books/tutorial/deployment/jar/manifestindex.html
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RE: unable to execute JAR file
Posted by Ir...@t-systems.com.
Thanks for all reply.
Now what I did is I compiled only one source file and made a jar out of
it which contains only one ArrayExample.class file. Once JAR available
then I unzipped that JAR and edited the manifest file as per your
suggestion but still I am getting same error.
Please find the attached java source file and manifest file.
Please help
Regards
Irfan.
-----Original Message-----
From: Taj, Abdul [mailto:abdul_taj@mcgraw-hill.com]
Sent: Wednesday, June 18, 2008 6:23 PM
To: Ant Users List
Subject: RE: unable to execute JAR file
Does the jar have a manifest file that specifies the main class that
needs to be executed when you execute it?
When you create a jar it will have a META-INF directory inside which you
need to place a manifest file that has the main class that needs to be
executed when you execute the jar file.
Just google about the manifest file and you will get your answer
-t
________________________________
From: Irfan.Sayed@t-systems.com [mailto:Irfan.Sayed@t-systems.com]
Sent: Wednesday, June 18, 2008 3:26 AM
To: user@ant.apache.org
Subject: unable to execute JAR file
Hi All,
I have 10 java files and I have written Ant build.xml to compile and
create JAR file which contains the .class files. Now my requirement is
that I need to execute/install the JAR file but unfortunately I can't do
this as I am getting following error.
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>java -jar
test.jar
Failed to load Main-Class manifest attribute from
test.jar
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>
Please find the attached java code and build script.
Please help
Regards
Irfan.
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RE: unable to execute JAR file
Posted by "Taj, Abdul" <ab...@mcgraw-hill.com>.
Does the jar have a manifest file that specifies the main class that
needs to be executed when you execute it?
When you create a jar it will have a META-INF directory inside which you
need to place a manifest file that has the main class that needs to be
executed when you execute the jar file.
Just google about the manifest file and you will get your answer
-t
________________________________
From: Irfan.Sayed@t-systems.com [mailto:Irfan.Sayed@t-systems.com]
Sent: Wednesday, June 18, 2008 3:26 AM
To: user@ant.apache.org
Subject: unable to execute JAR file
Hi All,
I have 10 java files and I have written Ant build.xml to compile and
create JAR file which contains the .class files. Now my requirement is
that I need to execute/install the JAR file but unfortunately I can't do
this as I am getting following error.
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>java -jar
test.jar
Failed to load Main-Class manifest attribute from
test.jar
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>
Please find the attached java code and build script.
Please help
Regards
Irfan.
--------------------------------------------------------
The information contained in this message is intended only for the recipient, and may be a confidential attorney-client communication or may otherwise be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, please be aware that any dissemination or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify us by replying to the message and deleting it from your computer. The McGraw-Hill Companies, Inc. reserves the right, subject to applicable local law, to monitor and review the content of any electronic message or information sent to or from McGraw-Hill employee e-mail addresses without informing the sender or recipient of the message.
--------------------------------------------------------
Re: unable to execute JAR file
Posted by Henning Bredel <h....@gmx.de>.
On Wednesday 18 June 2008 09:25:42 Irfan.Sayed@t-systems.com wrote:
> Hi All,
>
>
>
> I have 10 java files and I have written Ant build.xml to compile and
> create JAR file which contains the .class files. Now my requirement is
> that I need to execute/install the JAR file but unfortunately I can't do
> this as I am getting following error.
>
>
>
> D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>java -jar
> test.jar
>
> Failed to load Main-Class manifest attribute from
>
> test.jar
>
>
>
> D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>
>
>
You have to define your main class within the meta description of
your jar file.
see
http://ant.apache.org/manual/CoreTasks/jar.html
BTW: It must be *.classes instead of *.classess in your build.xml
Regards
Henning
Re: unable to execute JAR file
Posted by Ognjen Blagojevic <og...@etf.bg.ac.yu>.
> I have 10 java files and I have written Ant build.xml to compile and
> create JAR file which contains the .class files. Now my requirement is
> that I need to execute/install the JAR file but unfortunately I can’t do
> this as I am getting following error.
...
> Failed to load Main-Class manifest attribute from
You should read a bit about manifest files. See this link[1].
In short, JVM doesn't know which class has the main method to be used as
the entry point to your application.
-Ognjen
[1]
http://java.sun.com/docs/books/tutorial/deployment/jar/manifestindex.html
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To unsubscribe, e-mail: user-unsubscribe@ant.apache.org
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AW: unable to execute JAR file
Posted by "Knuplesch, Juergen" <Ju...@icongmbh.de>.
Use classname attribut instead of MANIFEST:
<java classname="yourcountry.company.yourclass" maxmemory="512m" fork="yes" dir="${yourdir}" timeout="10000000">
--
Jürgen Knuplesch
________________________________
Von: Irfan.Sayed@t-systems.com [mailto:Irfan.Sayed@t-systems.com]
Gesendet: Mittwoch, 18. Juni 2008 09:26
An: user@ant.apache.org
Betreff: unable to execute JAR file
Hi All,
I have 10 java files and I have written Ant build.xml to compile and create JAR file which contains the .class files. Now my requirement is that I need to execute/install the JAR file but unfortunately I can't do this as I am getting following error.
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>java -jar test.jar
Failed to load Main-Class manifest attribute from
test.jar
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>
Please find the attached java code and build script.
Please help
Regards
Irfan.
RE: unable to execute JAR file
Posted by "Toomey, Kevin H (ATS, IT)" <Ke...@thehartford.com>.
Hi Irfan,
You need a manifest file with a main class attribute.
A quick googling of 'jar main-class' brings back a wealth of links to
check out. Here's one:
http://java.sun.com/developer/Books/javaprogramming/JAR/basics/run.html
Thanks,
Kevin
________________________________
From: Irfan.Sayed@t-systems.com [mailto:Irfan.Sayed@t-systems.com]
Sent: Wednesday, June 18, 2008 3:26 AM
To: user@ant.apache.org
Subject: unable to execute JAR file
Hi All,
I have 10 java files and I have written Ant build.xml to compile and
create JAR file which contains the .class files. Now my requirement is
that I need to execute/install the JAR file but unfortunately I can't do
this as I am getting following error.
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>java -jar
test.jar
Failed to load Main-Class manifest attribute from
test.jar
D:\Irfan\Manvendra Singh java code\Manvendra Singh java code>
Please find the attached java code and build script.
Please help
Regards
Irfan.
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