Help with Using JAR files

I'm attempting to run a Java program that is contained in a .JAR file. The problem is not with that .JAR but with referencing a second .JAR for support classes. The problem is that I've created a support .JAR with two classes: Compute and Task called "Compute.jar". I've created a second class "ComputeEngine.jar" (in case you're wondering, this is the RMI example from the Sun website). I'm trying to compile this in XCode (Mac OS X IDE) which I'm not too familiar with but getting the hang of it.
I've gotten far enough to reference the Compute.jar in the compiling and building of ComputeEngine.jar but when I run the ComputeEngine.jar, I get nothing. So I use a terminal window to run the ComputeEngine.jar with "java" command. Here's what happens:
I enter: java -cp /Developers/Projects/Compute/build/Compute.jar -jar "ComputeEngine.jar"And I get an error: Exception in thread "main" java.lang.ClassDefNotFoundError: compute/ComputeI'm not sure why this is happening. Here is the jar tf Compute.jar output:
META-INF/
META-INF/MANIFEST.MF
compute/
compute/Compute.class
compute/Task.classAnyone have a clue?
Thanks
Matt

Thanks for the prompt response. Forgive my ignorace, but I'm new to JARs (actually wouldn't have been using it but for the fact that XCode defaults to that type of target). How do I specify the classpath in my jar? And which jar are we talking about? The Compute.jar or the ComputeEngine.jar?
Thanks again.

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Oracle 9i: Help with loadjava jar files to call out web service from pl/sql

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Dear,
I have read your article, it is useful for me. But I cannot Apply to my case. Please kindly help me. Thank you.
When running, the error occurs:
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My webservice Url: http://abc.com.vn:81/axis/ABC_WS_TEST.jws?wsdl
I make PL/SQL (similiar as your example)
FUNCTION INVOKESENDMT
RETURN VARCHAR2
AS
l_request soap_api.t_request;
l_response soap_api.t_response;
l_return VARCHAR2(32767);
l_url VARCHAR2(32767);
l_namespace VARCHAR2(32767);
l_method VARCHAR2(32767);
l_soap_action VARCHAR2(32767);
l_result_name VARCHAR2(32767);
p_zipcode VARCHAR2(160);
BEGIN
--p_zipcode:='''TEST'' ; ''TEST'';''84912187098'';''84912187098'';''0'';''8118'';''1'';''000001'';''ThuNghiem'';''''';
p_zipcode:='TEST';
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--UTL_HTTP.set_proxy('myproxy:4480', NULL);
--UTL_HTTP.set_persistent_conn_support(TRUE);
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--soap_api.set_proxy_authentication(p_username => 'TEST',
-- p_password => 'TEST');
l_url := 'http://abc.com.vn:81/axis/ABC_WS_TEST.jws';
l_namespace := 'xmlns="' || l_url || '"';
l_method := 'sendMT';
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l_result_name := 'sendMTResponse';
l_request := soap_api.new_request(p_method => l_method,
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soap_api.add_parameter(p_request => l_request,
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Help with creating jar file and running it ?

Hey guys,
I have a program with a package called classes and a sub-package called classes.mainLib.
I am trying to create a JAR file of the class files in mainLib. There is only one class file in classes and that contains the main method. So this is what i am doing:
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jar cvf mainLib.jar manifest ./*.class
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Failed to load Main-Class manifest attribute from
./lib/mainLib.jar
Any ideas why this is happening. the manifest is included in the jar'ing
Thanks.

At a glance, it looks like you are placing only the
class files in the jar and trying to navigate your
classpath to run it. Instead, you have to place ALL
the package folders into the jar from the root of
your package hierarchy and the jar runs anywhere, in
any folder. The packages are INSIDE the jar.
also I see cars/classes in a path you describe ...and
the program seems to wnat classes/Cars ??? Could
this be an additional issue (or am I missing seeing
something about your package structure)?Firstly, i believe all my spelling and cases are correct.
I have the following strcuture:
Cars.class (contains main) : package classes in ./classes directory
All other classes : package classes.mainLib in ./classes/mainLib
I would like to jar ALL files in mainLib but not the class that contains the main method. Is this possible?
I'm not sure how clear i was earlier, hope this is more understandable.

Help with runnin JAR files

java -cp smpp.jar:smscsim.jar com.logica.smscsim.Simulator
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Exception in thread "main" java.lang.NoClassDefFoundError: com/logica/smscsim/Simulator
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Here is a web site that i got this from: http://opensmpp.logica.com/CommonPart/Introduction/Introduction.htm
Thanks!

cp is an abbrieviation for classpath java -classpath .... is equivalent to java -cp. In your case, the jars contain the Simulator class. If you opened on with winzip or winrar you would find the Simulator class in com/logica/smscsim folder. It doesn't matter where the jar files are located. The line that you put on there, however, assumes that you are executing the java command from the same folder where the jars are.

Help with signing jar files

hi,
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import oracle.ewt.thread.Task;
import oracle.ewt.thread.TaskEvent;
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}but if I try to compile this code then I get all sorts of error telling me Iam missing vars and methods.
Can anyone tell me why this class is there and what it does and if its nessesary for the fileaccess then how can I create it

hi,
Iam trying to let a applet do file acces on a client.
Therefore I must sign a applet so it may access the
filesystem. This works, but the code keeps screaming
about security violations.
Now ive vopied the code from a example from Oracle and
I found one difference.
next to the fileUploader class that I also have in my
jar file there is a
FileUploader$1.class with the following code:
import oracle.ewt.thread.Task;
import oracle.ewt.thread.TaskEvent;
final synchronized class FileUploader$1 implements
Task
private final FileUploader this$0 = fileUploader;
private final boolean val$nf = flag;
private final Object val$val = object;
public void runTask(TaskEvent taskEvent)
FileUploader.access$0(this$0, val$val,
al$val, val$nf);
FileUploader$1(boolean flag, FileUploader
der fileUploader, Object object)
}but if I try to compile this code then I get all sorts
of error telling me Iam missing vars and methods.
Can anyone tell me why this class is there and what it
does and if its nessesary for the fileaccess then how
can I create it
a Name1$Name2.class file is generated from an inner class Name2 in a class Name1.
in your case you want to look at and compile FileUploader.java. This will then generate any inner class FileUploader$innerclass.class files necessary

Help with Java JAR file opbfuscation.

I am looking for a free (no $) for use on commercial java code
code obfuscation program, which can beat the Jode decompiler.
I have tried Proguard, and I have tried Joga
(using Jode itself for obfuscation is too complex for my purposes).
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without a financial outlay if possible,
given how easy it is to decompile Java bytecode?

All interesting remarks, everyone!
Proguard doesn't prevent decompilation on something very small, like a jar
with one or two classes.
Proguard is free(no money) for use over commercial java code,
and is itself a java jar, so it will run on Windows,
Mac and Linux platorfms.
It also correctly obfuscates and links external java libraries
and references to the man jar/class in a very systematic way.
I'm just wondering if there is something similar to proguard on licensing arrangements,
working over small amounts of code, and beating
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I have used the code obfuscation that Dr.Java performs on it's classes during compilation.
And while the resulting class file tested does confound Jode,
JD-Gui ("Java decompiler") instantly beats the results of Dr.Java.
Considering how easy it is to break class files, I was figuring that either Sun
or another would offer a free/open source/cheap way to secure these class files,
without resulting to Zelix Klassmaster, and instead of leaving a mess
of decompiled source code, prevent decompilation of java byte
code even happening at all?
Any ideas?
Edited by: Zac1234 on Jul 5, 2009 10:55 PM

Help with ejb-jar file

Hello everybody;
Have any of you read the article "HOWTO: Use a BC4J Application Module in a Stateless EJB Session Bean" ?
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I hope you read it, because I am clueless in al this stuff!

The EJB JAR DTD looks like this visually:
So you can include multiple <method> element siblings as the child of a <container-transaction> element.

Help using jar file!

Help using jar file!
Hello
I have created a jar file by using
jar cvmf Manifest.txt myjar.jar 1.class Mydirectory
In 1.java file :I have used
JEditorPane editor;
editor.setPage(getClass().getResource("/Mydirectory/default.htm"));
If I am only giving myjar.jar file to the client without Mydirectory then also it is working fine by showing default.htm in JeditorPane.
But my problem is I want to use
Runtime.getRuntime().exec("cmd /c start IEXPLORE"+targetstr) ;
targetstr will be the filename with path of the default.htm
If I am giving myjar.jar file with Mydirectory to the client it is working but I don't want to give Mydirectory to the client .
What should I do?
Is there any solution for this?
Using another jar file which will include mydirectory can solve this problem?
Is there any othe concept in java so that I wll be able to hide Mydirectory from client?
Please help.

It seems like you could extract the .htm file from the jar, either with Runtime.exec or using the Jar API classes.

Error while using .jar file instead of class file.

Hello friends,
I created a java class which are referred and called from other jsp\xml and java files. I compiled this java class and everything is working properly. However, I do not want to use class files but want to use jar files instead. So, I created a jar file of this class file by using the command "jar -cvf jarfilename.jar".I kept the jar file in its respective folder .Also, I removed the class file from its path, just to see that the jar file will work automatically.
Unfortunately, I am getting an error:
java.lang.RuntimeException: Component.createComponent(...) Component class not found: <java class path>. I also tried giving the path of this jar file in the classpath. This also does not seem working.
How to solve this problem?
Thanks,
Ranjith M.V
Edited by: RanjithM.V on May 11, 2008 10:34 PM

You probably populated the jar file incorrectly.
A common mistake is to include the path that you had on the classpath, in the jar file.
So a person will have a classpath like this: /foo/
And a class in a package bar, like this:
package bar;So that other classes would include the file like this:
import bar.TheClass;And the class file is on the filesystem like this:
.../foo/bar/TheClass.classThen they'll create the jar file including the foo directory, so if they list the jar's contents, they'll see the above (/foo/bar/TheClass.class). But this is wrong. It should start off so that the jar entries start with the top-level package names (like /bar/TheClass.class).
Maybe you've done that.

I need help with a PDF file that is an image, the "Read Out Loud' option does not work, please help!

I need help with a PDF file that is an image, the "Read Out Loud' option does not work, please help!

You mean an image such as a scanned document?
If that is the case, the file doesn't contain any text for Reader Out Loud to read. In order to fix that, you would need an application such as Adobe Acrobat that does Optical Character Recognition to convert the images to actual text.
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Using .jar files

I was able to use .jar files in Java programs that I write on my computer. I could write a program that used an import statement to bring in classes contained in a .jar file.
One day, I was trying to incorporate a jar file folder directly into my windows operating system by using the environmental variable called CLASSPATH. Unfortunately, I made the mistake of screwing up my PATH variable. I fixed my PATH variable back up by adding the directory to the bin folder inside of the Java folder as is described commonly by the documentation for installing the Java SE on windows computer.
Since that day, I have not been able to use .jar files using an import statement. My computer is unable to find the .jar files even if I specify the exact directory. Even the IDE(netbeans) that I use is unable to find and use .jar files. I have found that I can open up .jar files and pull the contents that I need out of said .jar files, but I have a project that does not allow me to open up the .jar files and extract the needed classes.
I have googled this problem so much that I have read hundreds of posts about .jar files, and I cant find anyone in a situation that is similar to mine. If I take my files to another computer with Java SE installed, then my source code can access the .jar files just fine. For some reason, my work computer seems to hate using .jar files. I have no idea what could be the problem. There is no information in the java documentation on troubleshooting with this problem, and the most confusing part is that it worked perfectly fine until That one day
Does anyone have any ideas?
Specific technical details:
I need to pull the Stopwatch.class file from a stdlib.jar file. In the past I had done this by using an import statement inside of my program:
"import stdlib.Stopwatch; "
Using this command to compile:
"javac -cp .;(directory path to .jar file); source.java"
This used to work. Now when using the javac command I get error messages
1. Error points directly to import statement. Arrow directed at the period after stdlib.
"cannot find symbol"
2. Error message pointing to all instances of the class that I was attempting to import into my program.
Thanks for reading
Edited by: 955611 on Aug 28, 2012 7:22 PM

I read your post. I want to compile this project by using the "-classpath" option in the javac command. After screwing up important system variables once, I do not want to continually have to play with system variable in order to compile projects. To quote from the website that you linked:
Using the JDK tools' -classpath option
The JDK tools java, jdb, javac, and javah have a -classpath option which replaces the path or paths specified by the CLASSPATH environment variable while the tool runs. This is the recommended option for changing class path settings, because each application can have the class path it needs without interfering with any other application.
The runtime tool java has a -cp option, as well. This option is an abbreviation for -classpath.
For very special cases, both java and javac have options that let you change the path they use to find their own class libraries. The vast majority of users will never to need to use those options, however.
Clearly, the "-classpath" option in the javac is intended to replace the need to play with important system variables. I guess my post boils down to the question of "Why doesn't this command work for me?". I followed your suggestion by removing the bin directories and adding the stdlib.jar directory directly into the system variable itself. Here is the following output from my command prompt:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Lelo>E:
E:\>cd Programs\Java
E:\Programs\Java>javac testy.java
testy.java:1: error: package stdlib does not exist
import stdlib.Stopwatch;
^
1 error
E:\Programs\Java>echo %CLASSPATH%
C:\Program Files\Java\jre6\lib\ext\QTJava.zip;E:\Programs\Java\stdlib.jar;
E:\Programs\Java>javac -classpath .;E:\Programs\Java\stdlib.jar; testy.java
testy.java:1: error: package stdlib does not exist
import stdlib.Stopwatch;
^
1 error
E:\Programs\Java>
I still received the same errors. It seems that even adding the directories into the system variable will not work for me.

Using JAR file in running application and POI !

Hi all
I am trying to use POI HSSF f(for the first time, So pls bear with me!)or creating excel file from my java Application. I am using the jar file :
poi-2.0-RC2-20040102.jar. Not sure if its the correct one. So If I am wrong pls correct me.
Now I am creating a bat file to compile my application:
@echo off
C:\jdk1.3.1_04\bin\javac -classpath C:\POI\poi-2.0-RC2-20040102.jar MyApp.java
pauseIt compiles fine. Now If I try to use the jar file in run.bat for running my application, it says NoClassDef FoundError:MyApp. Here is my run.bat
java -classpath C:\POI\poi-2.0-RC2-20040102.jar MyApp
pauseI am not able to run my application with this run.bat file . If I change the content to:
"java MyApp.java"
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Pls suggest me about how to use jar file in running my app and how to rresolve workbook finding problem.
Reagrds

Try this:
java -classpath .;C:\POI\poi-2.0-RC2-20040102.jar MyApp
pauseNote the "dot semi-colon" at the start of the CLASSPATH. That puts the current directory in the CLASSPATH, which is where MyApp.class lives. (No package, right?)
See if that works better.

How to use jar files without setting classpath

Hi,
I have a situvation, I can not set classpath, but i have to use jar files, how can I do that.

URL[] urls = new URL[]{pathToJar, pathToAnotherJar, ...};
URLClassLoader urlc = new URLClassLoader(urls);
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Use jar file

dear guys,
can somebody tell me why would use jar file? how it would be use? i would like to get the idea of jar file
thanks

Are you familiar with zip files? A jar file is just a kind of zip (the jar utility will even read zip files as though they were jars).
The most common use is to hold .class files generated from all the classes of a Java program so that you can run the program from that one file, rather than very large numbers of small class files. Libraries of classes are almost always stored as jars.
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Performance issue if we use jar file instead of classes

Hi,
My application uses tomcat as web server.
If i use calsses in webapps -> WEB-INF -> classes folder, i place classes in that ,
In other case i use jar file and place that file in WEB-INF -> lib folder in the webapps directory.
There is huge performance difference.
While using classes performance is great while using jar file performance is very disappointed.
I am using a file for encryption /decryption also.

I can't really believe that classes vs jars makes a difference, but whatever.

Help with Using JAR files

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