Updating to a directory in a jar file

I'm completely lost...
I need to know how to do this can someone direct mke to a tutorial or something...
that would be most appreciated...
thx

Do you mean that you want a running program to alter the jar file that it's deployed in?
I'd strongly advise against this. It's a huge pain in terms of ongoing maintenance if the jar file you deploy isn't the same jar file that the user has after a month of using the program. Plus it means that the user is implicitly installing software (kind of) while running the program...it's kind of a muddle.
What are you trying to accomplish?

Similar Messages

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 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.

How to add a directory into a jar file

Hi, guys, I want to add a package into a jar file. For example, my dirctory structrue
is org/test/, all files locate in the directory test, in org.test package. I want to
add the package into a jar file, test.jar. I use "java -cvf test.jar -C org/test/ .
But it says "jar: no match". How can I solve it.
thanks

Instead of 'java', use 'jar'.
All in all, try this: jar cvf test.jar -C org/test/*.class.
Have a nice day!

Problems with loading Classes from a Directory of a jar file.

Hi Guys,
i have a problem with my programm. It works greatly in my eclipse platform. but there are all classes in my default folder. I want to add a plugin function now. My Abstract classes are in in my default folder and my doughter classes are in my plugin-folder called plugin.
I look what is in the pluginfolder -> all my doughter classes. but i every time get a Class Cast Exception and an ClassNotFoundException.
How can i do that ? Current i do it with Class.forName(frames.substring(0,frames[i].indexOf(".class")));
best regards flo

http://java.sun.com/j2se/1.3/docs/tooldocs/win32/classpath.html

Updating an EJB jar file on WL7.0

Hi
Iam attempting to update an EBJ jar file without taking down my WL7.0 server.
When I copy the jar file to the applications directory, I see the server accepting
the update but when I run my client the update is not visible! Iseem to be still
accessing the old ejb.
From my understanding, if the server is running in development mode I should be
able to copy the jar file with my update directly to the applications directory(
overwriting old jar file) and be able to access the udated ejb.

Hello Ron,
An alternative would be to modify a REDEPLOY file if your application is deployed
in exploded directory format. However, updating the EJB JAR should also do the
trick. Try going into the Admin console and explicity redeploying the EJB JAR
file after copying over the new JAR file. Let us know if any errors appear.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Ron Turner" <[email protected]> wrote:
>
Hi
Iam attempting to update an EBJ jar file without taking down my WL7.0
server.
When I copy the jar file to the applications directory, I see the server
accepting
the update but when I run my client the update is not visible! Iseem
to be still
accessing the old ejb.
From my understanding, if the server is running in development mode I
should be
able to copy the jar file with my update directly to the applications
directory(
overwriting old jar file) and be able to access the udated ejb.

Update a jar file

hi i have a jar file, which has a fillowing directory. WEB-INF/classes.
I want to add a new file to this directory in the jar file.
How do i do that.

You can use the Runtime class like:
Runtime.getRuntime().exec("jar uf myJar.jar ClassToAdd.class");Unfortunatly you can't programmatically insert a new entry into an existing archive without creating a new one. I think this is a RFE.

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 do you execute a JAR file?

I'm sorry this is so basic, but I honestly do not know how to do this nor can I find anything online here or anywhere via Google to help me with this one.
I have a JAR file that I created on another machine using JDK 1.6.0 and NetBeans 5.5 on WinXP.
I copied and pasted that JAR file over to my machine at home also using JDK 1.6.0 and NetBeans 5.5 on WinXP
I put the exact directory name where the JAR file resides, "C:\Program Files\Java\jdk1.6.0\classes", in CLASSPATH and rebooted my machine.
However, upon CD'ing to that directory and doing "java -classpath . GUI.jar", I get a "NoClassDefFoundError" when trying to do so.
Furthermore, I was not sure how to use NetBeans to run the JAR file to execute the classes within.
What did I do wrong? I'm so sorry this is so basic.
Thanx
Phil

You are using netbeans to build your jar. Go to your project properties (right click on the project name and choose properties). Then select "Run" from the tree. You will find a text box "Main Class" there, put the name of the class in there that has your main() method, including full package if you have one. That is WITHOUT the .class extension.
Build your jar, it will be placed in the dist directory of your netbeans project. You can now run it from netbeans itself if you want. If ever you want to run the jar from the command line on your home machine, just navigate to the directory with the jar file and execute this:
java -jar yourjar.jarand you're off. If your runtime environment is propertly setup you can even execute the jar by simply double clicking on it from the windows explorer. No need to change the CLASSPATH variable at all, in fact it is ignored when executing a jarred application.
Also a note: you do not need to reboot your machine when you change an environment property. Simply change them using my computer -> properties -> advanced tab -> environmental variables. If you have any command prompts open, close and reopen them so the properties are updated properly.

Using a JAR file as a project file

My application allows the user to create projects. Previously, a project file was simply an XML file. Now, a project file needs to also contain many images.
I thought it would be a good idea to simply use a JAR file as my project file.
Since I've really never really worked with JAR files and the java.util.Jar package directly, I have a few questions.
1) Would it be better just to simply store the images as binary in the XML file? I just spent a good amount of time making the XML file very readable so I thought it would be better to keep the images separate while still having a single "project" file.
2) Is there anything inherently wrong with the way I'm working with the JAR file in the code below?
Simple XML file:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE project [
<!ELEMENT project (img+)>
<!ELEMENT img EMPTY>
<!ATTLIST img src CDATA #REQUIRED>
]>
<project>
     <img src="blah.jpg"/>
</project>
import java.io.*;
import java.util.jar.JarFile;
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
public class LoaderTest {
    private String imageName;
    public LoaderTest() {
        InputStream i = null;
        JarFile jf = null;
        try {
            jf = new JarFile("project.jar");
            i = jf.getInputStream(jf.getJarEntry("project.xml"));
            // Here's my simple XML parser to load the project and images
            SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
            parser.parse(new InputSource(i), new DefaultHandler() {
                @Override
                public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
                    // Right now we only care about images
                    if (qName.equalsIgnoreCase("img")) {
                        imageName = attributes.getValue("src");
            // Load the image from the inputstream
            java.awt.image.BufferedImage img = javax.imageio.ImageIO.read(jf.getInputStream(jf.getJarEntry(imageName)));
            // Display the image in a JFrame
            javax.swing.JFrame f = new javax.swing.JFrame();
            f.setLayout(new java.awt.BorderLayout());
            f.setSize(800, 600);
            f.getContentPane().add(new javax.swing.JLabel(new javax.swing.ImageIcon(img)), java.awt.BorderLayout.CENTER);
            f.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
            f.setVisible(true);
        } catch (ParserConfigurationException ex) {
            ex.printStackTrace();
        } catch (SAXException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            // Do our best to close the input streams
            if (i != null) {
                try {
                    i.close();
                } catch (IOException ex) {}
            if (jf != null) {
                try {
                    jf.close();
                } catch (IOException ex) {}
    public static void main(String[] args) {
        new LoaderTest();
}Thank you!

1) I also think it's much better to keep your images separate from your XML, this prevents a lot of in case you just want to read XML data
2) What's exactly going wrong here? For the project.xml, make sure it's not inside a directory within the JAR file, or else the variable i will be null. Otherwise it looks fine..

Unable to run jar file without lib folder containing swing-layout-1.0.jar

I have done my project through NetBeans 5.0. Eventhough I have copied my lib foloder containing swing-layout-1.0.jar inside my project.jar, I am still unable to run my project.jar in other systems, it is creating an error as Could not find the main class. Program will exit. But if I copy the lib foloder containing swing-layout-1.0.jar in the same path as the project.jar, then my project.jar is running.
But I want to give only the project.jar for other users and not also lib foloder containing swing-layout-1.0.jar each time.
Could someone please help me with this.

When you develop GUI applications using the Netbeans you may endup using netbeans specific jar files in your auto generated code.
And when you build jar files with netbeans it copy the third party jar files used in a application in to a lib folder in the same directory as the jar file of your project. And then set a class path entry to those jar files in your project jar file's manifest file.
So if you want to redistribute the package you have to redistribute your jar file and every thing in the lib folder in with the same directory structure.
If you want to change the structure you will have to change the class path to suit the new structure.

How do I add a jar file into the build path of the compiler?

Hey,
I'm trying to import a jar file into the build path of the compilation process, but it does not find the packages or the classes that are in it.
I think I don't add it right...
          ArrayList<String> options=new ArrayList<String>();
          options.add("-d");
          options.add(targetDirectory);
          options.add("-classpath");
          for(String str:includeDirectory)
               options.add(str);
          if (!compiler.getTask(writer, fileManager, diagnostics, options, classes, compilationUnits).call());
                ....and I've tried this way:
     public void setTargetDirectory(String targetDirectory) {
          this.targetDirectory = "-d " + targetDirectory;
     private void compile(Iterable<? extends JavaFileObject> compilationUnits) throws Exception {
          ArrayList<String> options = new ArrayList<String>();
          options.add(targetDirectory);
          String classPath="-cp ";// tried this also with "-classpath"
          for (String str : includeDirectory)
               classPath+=str+":";
          options.add(classPath);
     if (!compiler.getTask(writer, fileManager, diagnostics, options, classes, compilationUnits).call())
          // throw new Exception("Compilation Error");
     }Thanks in advance,
Adam.
Edited by: Adam-Z. on Feb 24, 2010 5:41 AM
Edited by: Adam-Z. on Feb 24, 2010 5:42 AM

Thank you for your reply,
Q: Are there .class files in that directory in that jar file? (the compiler doesn't ( can't )) look for directories, it can just look for specific files , and scan to get a list of all files matching certain criteria. So if there are no class files, it will say the package doesn't exist, even if there is a directory, possibly containing other files.yes there are class files in the jar, the tree structure:
j2MeDataChunkGenerator_Plugin\(lots of class files)
META-INF\manifest.mf
and thats it.
, your code will only work on windows because other platforms use a different path separator. You should use java.io.File.pathSeparator not explicit ';" when building your classpath. (this is unrelated to your problem, but you should correct it)will do, thanks.
Q: Is that error in your post formatted by your own diagnostics? (we could possibly help you better if we didn't have to guess!!)I would not post my own error code, this text is generated by the compiler diagnostic.
{code}
     System.err.println(" Error details: " + diagnostic.getMessage(null));
{code}
Q: Is line 3 of ImageCroper_Editor.java (sic) an import statement? (we could possibly help you better if we didn't have to guess!!)it is an import error... didn't the error message stated that it is an import problem? wired, I'm sure before it did. anyway it is an import error.
Also you don't show us what the variable includeDirectory is in terms of type, and contents, that might be helpful. (we could possibly help you better if we didn't have to guess!!)It has only one String object: "D:\%Important Documents\WorkSpaces\PacMan\ApplicationManager\Plug-in\Data Chunk Designer.jar"
the last file on the classpath list.
Q: Have you proven this? that i did post, in this long line of text.
Q: Is the compiler finding other classes (in other packages) in that same jar file?No. all the class files are in the jar, they all have entries that start with "j2MeDataChunkGenerator_Plugin\*.class", and since I get 47 errors I guess it does not load any other class.
thank you for you comments, the problem with having these errors, is that I can't even get a piece of information where this error is coming from, only that it is an import loading error package not found, what does that mean? that the jar was not loaded in compilation(no error about this), that the jar is corrupted(no error about this), that the path is incorrect(it is correct I made sure), that there is no such package in the jar(There is), that the compiler does not load the package(does it even do that?), really I can't even guess why this happens, I've been at this on and of all day today, really annoying.
Thanks,
Adam.

Importing .jar files

I have been checking out the forums and I think I am more confused than before. I have a bunch of classes in a .jar file and I want to use them in another app. I haven't changed what my classpath is because it has been so confusing I decided to reinstall the j2sdk. What should I set the classpath too? I have my class and the .jar file that I want to use in C:\Java Stuff\. What import statement do I have to have if the name of my .jar file is MyClasses.jar?
Thank you!

What you're saying is that your directory structure is something like this:
C:\Java Stuff\com\mydomain\myclasses\MyClass.class
C:\Java Stuff\MyJar.jarIf this is the case, you don't have to extract the files from the jar file into the directory. The jar file contains all the files and Java is able to fetch them directly in the jar file.
However, to do this, your class path must include the jar file, and not just it's directory.
So instead of:
CLASSPATH=c:\j2sdk1.4.0_02\bin;c:\Java Stuff;you must have
c:\j2sdk1.4.0_02\bin;c:\Java Stuff\MyJar.jar;Hope it helps!

How to access files outside a .jar file netbeans project

Hi, i need to access a file outside a built project inside netbeans. Ideally i would like this file next to the .jar file as myapp.properties. If possible i would like it so that when i am compiling and running the project in netbeans the file can be with the class files or something along those likes. Either way it would be nice to have different code for built projects and just running them outside a jar.
Heres what i got so far
properties = new Properties();
            InputStream in = this.getClass().getResourceAsStream("applications.properties");
            properties.load(in);
            in.close();this only works if the file is next to the classes. (think thats called the classpath ? )
Thanks for any replies!!

Your wrong code:
properties = new Properties();
InputStream in
= this.getClass().getResourceAsStream("applications.properties");
properties.load(in);
in.close();A right code:
// basic assumption 1: applications.properties
// is a pure ISO 8859-1 text file
// basic assumption 2: the file applications.properties
// is stored in the same directory where your
// jar file is stored
properties = new Properties();
try{
FileInputStream in      // assume current dir
   = new FileInputStream("applications.properties");
properties.load(in);
in.close();
catch (Exception e){
e.printStackTrace();
}

Imported Jar file not loaded at run time ORA-105100

Oracle 9iDS forms Version 9.0.2.9.0
Oracle 9iAS Release 2
I have imported java classes from a jar file into my form. I have it working in client server. Added the entries to the classpath in the default.env and system environment variable for development of the form and for execution.
Moved the jar file, form and testing html to the application server. Modified the classpath in the default.env file. Tested the form. Got the ORA-105100 error. MetaLink note 261650.1 states that error frm-40735 When-Button-Pressed triger raised exception ORA-105100 if calling a java function from a jar file. Cause: Jar file not loaded at run time. Solution: add in your default.env CLASSPATH parameter your jar file including the whole directory of the jar file location. That has been done and the OC4J has been restarted. Still get error.
Oracle support has not been able to give me much help as of yet. Does anyone have any further ideas, or documentation that I can read to help get this working?
Thanks in advance for any assistance that is offered.

Hey people any clues?

Updating to a directory in a jar file

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