How to create inputstream to a .jar

i want to make an inputstream that points to the jar file
my main class was executed from.
this dosent seem to work:
InputStream is = CypherIO.class.getResourceAsStream("jar.jar");i guess a "resource" is something inside a jar...
also it would be nice if i could rename the jar and it would still work.
my goal is to rewrite the entire jar.

This would try to find a file called "jar.jar" in your
classpath, which probably means INSIDE your program's
jar file. There is no way to find the location of the
jar file your classes are in. The only thing you could
do is to get the classpath system property and walk
through it (parsing it), looking for your program's
jar file. But rewriting the jar file while your
program is running could wreak some serious havoc with
your poor little JVM.well, i could get the directory structure form a url created from one of the classes inside the jar.
but even with the directory i dont know how i would create the inputstream.
then i guess well find out what happens when i try and rewrite it. it seems likely that the vm would be done with the jar once it gets the code it needs.

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How to create and use library JAR files with command-line tools?

Development Tools -> General Questions:
I am trying to figure out how to put utility classes into JAR files and then compile and run applications against those JAR files using the command-line javac, jar, and java tools. I am using jdk1.7.0_17 on Debian GNU/Linux 6.0.7.
I have posted a simple example with one utility class, one console application class, and a Makefile:
http://holgerdanske.com/users/dpchrist/java/examples/jar-20130520-2134.tar.gz
Here is a console session:
2013-05-20 21:39:01 dpchrist@desktop ~/sandbox/java/jar
$ cat src/com/example/util/Hello.java
package com.example.util;
public class Hello {
    public static void hello(String arg) {
     System.out.println("hello, " + arg);
2013-05-20 21:39:12 dpchrist@desktop ~/sandbox/java/jar
$ cat src/com/example/hello/HelloConsole.java
package com.example.hello;
import static com.example.util.Hello.hello;
public class HelloConsole {
    public static void main(String [] args) {
     hello("world!");
2013-05-20 21:39:21 dpchrist@desktop ~/sandbox/java/jar
$ make
rm -f hello
find . -name '*.class' -delete
javac src/com/example/util/Hello.java
javac -cp src src/com/example/hello/HelloConsole.java
echo "java -cp src com.example.hello.HelloConsole" > hello
chmod +x hello
2013-05-20 21:39:28 dpchrist@desktop ~/sandbox/java/jar
$ ./hello
hello, world!I believe I am looking for:
1. Command-line invocation of "jar" to put the utility class bytecode file (Hello.class) into a JAR?
2. Command-line invocation of "javac" to compile the application (HelloConsole.java) against the JAR file?
3. Command-line invocation of "java" to run the application (HelloConsole.class) against the JAR file?
I already know how t compile the utility class file.
Any suggestions?
TIA,
David

I finally figured it out:
1. All name spaces must match -- identifiers, packages, file system, JAR contents, etc..
2. Tools must be invoked from specific working directories with specific option arguments, all according to the project name space.
My key discovery was that if the code says
import com.example.util.Hello;then the JAR must contain
com/example/util/Hello.classand I must invoke the compiler and interpreter with an -classpath argument that is the full path to the JAR file
-classpath ext/com/example/util.jarThe code is here:
http://holgerdanske.com/users/dpchrist/java/examples/jar-20130525-1301.tar.gz
Here is a console session that demonstrates building and running the code two ways:
1. Compiling the utility class into bytecode, compiling the application class against the utility bytecode, and running the application bytecode against the utility bytecode.
2. Putting the (previously compiled) utility bytecode into a JAR and running the application bytecode against the JAR. (Note that recompiling the application against the JAR was unnecessary.)
(If you don't know Make, understand that the working directory is reset to the initial working directory prior to each and every command issued by Make):
2013-05-25 14:02:47 dpchrist@desktop ~/sandbox/java/jar
$ cat apps/com/example/hello/Console.java
package com.example.hello;
import com.example.util.Hello;
public class Console {
    public static void main(String [] args) {
     Hello.hello("world!");
2013-05-25 14:02:55 dpchrist@desktop ~/sandbox/java/jar
$ cat libs/com/example/util/Hello.java
package com.example.util;
public class Hello {
    public static void hello(String arg) {
     System.out.println("hello, " + arg);
2013-05-25 14:03:03 dpchrist@desktop ~/sandbox/java/jar
$ make
rm -rf bin ext obj
mkdir obj
cd libs; javac -d ../obj com/example/util/Hello.java
mkdir bin
cd apps; javac -d ../bin -cp ../obj com/example/hello/Console.java
cd bin; java -cp .:../obj com.example.hello.Console
hello, world!
mkdir -p ext/com/example
cd obj; jar cvf ../ext/com/example/util.jar com/example/util/Hello.class
added manifest
adding: com/example/util/Hello.class(in = 566) (out= 357)(deflated 36%)
cd bin; java -cp .:../ext/com/example/util.jar com.example.hello.Console
hello, world!
2013-05-25 14:03:11 dpchrist@desktop ~/sandbox/java/jar
$ tree -I CVS .
|-- Makefile
|-- apps
|   `-- com
|       `-- example
|           `-- hello
|               `-- Console.java
|-- bin
|   `-- com
|       `-- example
|           `-- hello
|               `-- Console.class
|-- ext
|   `-- com
|       `-- example
|           `-- util.jar
|-- libs
|   `-- com
|       `-- example
|           `-- util
|               `-- Hello.java
`-- obj
    `-- com
        `-- example
            `-- util
                `-- Hello.class
19 directories, 6 filesHTH,
David

How to create java archive using jar command

hello
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urgent plzz

jar cf myjar.jar classfiles...
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How to create package and import from jar file?

Hi all,
I am writing a software and I am not sure how to create a package for the classes.
Say I have two classes in the same directory as follows:
testA.java
==========
package AB;
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testB.java
===========
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This Swing app has 2 class files, requires Swing Library to be imported (of course), and requires no other files. It seems like the program does not import Swing Lib. so that it can display the JFrame inside.
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Kumar
hari wrote:
hello friends,
hi friends, im working on weblogic commerce server3.1 . i dont know how to create a .jar file in weblogic commerce server3.1. can any one knows send email to me.
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Hi,
I have a project in Eclipse. I wrote already an ant build file for creating an executable jar which includes all project files.
Now I want to create a second executable jar which is a subset of the project (a limited number of classes are necessary).
I have a main class and I was looking for a way to generate a jar file which includes the main class and all the depending classes.
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Regards,
Biebel
Edited by: biebel1975 on Jan 7, 2009 10:21 AM

biebel1975 wrote:
Some more information:
When I compile all the classes, the jar file is +/- 3.5Mb inclusive the server side logic.
The subproject I want to build, should be less then 1Mb (Only some screens and beans, no business logic ((only +/- 10% of the projects code) )).
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What are you talking about?
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Ant uses script files.
Since you have one with X items in it and you want something new with X-Y items in it the obviously it would make sense to construct an ant script that does less than the other ant script.
The following provides a huge amount of information about Ant.
[http://ant.apache.org/resources.html]
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Hi
I'm very new to Java. I have a private project to do a little admin application for bulk changes to my itunes library via their COM API. Previously I used several javascripts to do this so I don't expect a lot of work to adapt them to Java. I use eclipse and have downloaded com4j (https://com4j.dev.java.net/servlets/ProjectDocumentList) to create wrappers to the COM-objects in iTunes. the quick intro to com4j say that the wrappers are created by the tlbimp.jar. I know that JAR is a a java archive created by jdk using jar.exe but I can't get out a tlbimp.jar file how much i try. If I do something like this
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Edited by: 802710 on 2010-okt-15 03:16

802710 wrote:
Hi
I'm very new to Java. I have a private project to do a little admin application for bulk changes to my itunes library via their COM API. Previously I used several javascripts to do this so I don't expect a lot of work to adapt them to Java. I use eclipse and have downloaded com4j (https://com4j.dev.java.net/servlets/ProjectDocumentList) to create wrappers to the COM-objects in iTunes. the quick intro to com4j say that the wrappers are created by the tlbimp.jar. I know that JAR is a a java archive created by jdk using jar.exe but I can't get out a tlbimp.jar file how much i try. If I do something like this
jar -cvf tlbimp.jar *
Does that make sense? What prerequisites are important? Does jar.exe have to be in som path variable in windows? Should I be in the folder where the classes are or one level up? Anything elseIt sounds to me like the documentation is saying that Java classes in the tlbimp.jar are used to create the wrappers - you do not need to create that jar. I bet if you look at the zip file you downloaded, you will find tlbimp.jar inside the zip file. You need to extract that jar and any other jars inside the zip file and configure Eclipse to use them.

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How to create inputstream to a .jar

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