How to find directory java program .jar file is in?

I have a Java program that needs to save some configuration and data files in the same directory as the .jar file that contains the program.
If the user launches the app from that directory, it's easy.
The problem is when they do something like "java -jar /dir1/dir2/program.jar".
When they do that, HOW can I find the directory the .jar file is in - from within the program?

CasaDelGato wrote:
I have a Java program that needs to save some configuration and data files in the same directory as the .jar file that contains the program.
If the user launches the app from that directory, it's easy.
The problem is when they do something like "java -jar /dir1/dir2/program.jar".
When they do that, HOW can I find the directory the .jar file is in - from within the program?There is an obscure way that basically consists of the following.
1. Get the class loader of the class (obviously one in the jar)
2. Find the 'resource' of that.
3. Resolve that to a path
4. Make it absolute if not already.
5. Extract the directory part.
2 and 3 are always the hard ones (conceptually and figuring out from the javadocs). There are examples somewhere on the forum.

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How to run tools from a java archive (jar file)

I used to run Multivalent from http://multivalent.sourceforge.net/ but am now getting error messages like this:
Exception in thread "main" java.lang.NoClassDefFoundError: tools/pdf/Impose
This happens even when I'm in the directory containing the jar file.
I've never installed it by myself though so am not sure that I've done it right. I put the jar file into ~/library/java but that was a guess after reading lots of web pages that don't quite say what to do. They assume that I've read some intro material that I haven't been able to find.
Any pointers on where I can find out how to do this right?
In case it's relevant, java -version returns:
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b06-284)
Java HotSpot(TM) Client VM (build 1.5.0_16-133, mixed mode, sharing)
and echo $CLASSPATH returns a blank line.

Not necessarily. The -cp parameter can include a complete file spec. You can create a Unix alias for the whole command line. For example:
alias compress='java -cp ~/JarFolder/Multivalent20060102.jar tool.pdf.Compress'
I use Multivalent tools a lot for maybe a week at a time, then don't touch them for a couple of months. During the downtime I'd just forget aliases like this.
On Macs, the default classpath includes the folder /Library/Java/Extensions. If you drop the jar file into this folder then you won't need to specify an explicit CLASSPATH variable nor the -cp option.
I thought so too, but it doesn't appear to be the case on my computer. Both /Library/java/extensions and ~/library/java are on DefaultClasspath but CLASSPATH is empty. And even when the directories are specified, the jar file in it is ignored unless I specify that explicitly as well. I do not remember needing to do that in the past. It used to just work when it was in a classpath directory.
I get the impression that something has changed in how Mac Java handles the classpath. In searching for answers I noticed that many people were attributing their difficulties to a classpath change in a recent update. It is not something that I see myself dealing with in the near future. But it would be helpful to know of a primer for newcomers to Java and the OS X directory conventions so they know where to put things and what paths to set for basics like this.

How to detrmine what directory you (the JAR file) are in

Is there some sort of function that returns (ideally in a string, or array of strings) what directory you (the JAR file) are in? Something along the lines of:
String dir = Function();Then dir would be something like : "C:\Users and Settings\Me\Java Apps"
Thanks.

It's not clear exactly what is wanted. Look at the information in the API for java.lang.System,getProperties(), which lists properties available - choos the one you want.

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 call a java program in javafx class(Urgent) and even vice versa

Hi all,
Here I have two questions:
1)
Please let me know how to call a javafx in java program...
I tried with the following code but it is not working..
The below is the java program in which I made a call to the Fx program.
FxMainLauncher.java
import net.java.javafx.FXShell;
public class FxMainLauncher {
public static void main(String[] args) throws Exception {
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import check.*;
import javafx.ui.*
var instance = new MyJava();
//visible:true
System.out.println("Number is: {instance}");
Here is my java program
public class MyJava {
public static void main(String args[])
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V.Srilakshmi

GOT IT !!!
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JNIEXPORT void JNICALL Java_HelloWorld_display(JNIEnv *, jobject);
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compile and build the shared library to get "libhello.so" file
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I need to know how to design a java program to java
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Regards,
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It needs any jar file.Of course!
I did using jscape.My program is running fine.But it
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>
I have the doubt is apache provides jar file free
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How can I get a single jar file with NetBeans?
When I create the project I get these files:
dist/lib/libreria1.jar
dist/lib/libreria2.jar
dist/software.jar
The libraries that have been imported to create the project are in separate folders:
libreria1/libreria1.jar
libreria2/libreria2.jar
libreria1, libreria2, dist folders are all located inside the project folder.
I added the following code to the build.xml:
<target name="-post-jar">
<jar jarfile="dist/software.jar">
<zipfileset src="${dist.jar}" excludes="META-INF/*" />
<zipfileset src="dist/lib/libreria1.jar" excludes="META-INF/*" />
<zipfileset src="dist/lib/libreria2.jar" excludes="META-INF/*" />
<manifest>
<attribute name="Main-Class" value="pacco.classeprincipale"/>
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Of course there is also the project folder:
src/pacco/classeprincipale.form
src/pacco/classeprincipale.java
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This is not a NetBeans forum, it is a JDeveloper forum. You might want to try http://forums.netbeans.org/. I also saw your other question - try looking in the New to Java forum: New To Java

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How to make a Java program that recognises a function of two variables to assign values to that?
First I will give an example and then do the question.
Ex1.
We have any function, eg.y = x ^ 2 + 1 (read 'y' equals 'x' high to the square), a function of the second degree.
To build the graph of this function attach values to 'x' to find the values of 'y'
And thus mount the pair ordered (x, y) which represents a point on the Cartesian plane.
Assigning values to 'x' 'we can build up a table that gives us the pairs ordered:
We can use any numbers, but arfer interval [-3.3]
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0 | y = (0) ^ 2 +1 = 1
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1 | y = 2
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Now I begin to explain my doubts.
See this program:
Ex2
* To change this template, choose Tools | Templates
* And open the template in the editor.
Encontrando_o_valor_de_y package;
* @ Author des Soldat Gottes
Import javax.swing.JOptionPane;
Public class (Main
* @ Param args the command line arguments
Public static void main (String [] args) (
Int x, y;
String x1;
X1 = JOptionPane.showInputDialog ( "We have the function y = x + 1 \ n" +
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X = Integer.parseInt (x1); / / tranforma String in int
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/ / Displays the value of 'y'
System.exit (0);
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"Assign a value for 'x',");
The entry is a number and that number is assigned aa ja existing function in the (y = x + 1).
The question is: would it be possible to come to a function?
Ex: the program ask: DIGITE THE FUNCTION?
The USUARIO DIGITARIA A FUNCTION ANY, TYPE: y = x ^ 2 +1
The program would recognize the function and give numerical values to that function as Ex1, at the beginning of this text.
And then to find the values of the x and y launch a table.
It would be possible that?
By invez of entering with a number so that the program sustitua a function ja existing as Ex2, seen above, entering with a function quaquer (type: y = x ^ 2 +1) for the program atribuisse values to that function and then create a table of values as Ex1.
I hope it has been easier to understand my doubts now.
Thank you for your attention!
God bless!

rafaelmenezes wrote:
Thanks for the explanation, could understand what fly said.
But as it applied to a program?
How to create a program that recognizes that the entry coefficients?Are you asking about how to parse out the coefficients from the string "3x^4 + 4x^3 - 8x^2 + 5x^1 + 2x^0"? If you define the format to strictly follow that example, this should get you started:
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try
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Hi Naichen,
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Regards,
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"Naichen Liu" <[email protected]> wrote:
>
>
>
Hi,
I am having a warning message when trying to generate java proxy jar
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C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\AlphaLength2Deserializer.java:36: cannot resolve symbol
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C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\FreeFormAnonTypeDeserializer.java:36: cannot resolve
symbol
symbol : class FacetUtils"
Can anybody help me about this issue? I attached WSDL file, also United
Airlines
got an enterprise weblogic license deal with BEA, any help will be highly
appreciated.
Thanks!!!
Naichen

How to find directory java program .jar file is in?

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