Newly created jar file has no classes
HI Gentlemen,
When I create a jar file with the jar tool from the java source code of my new applet to deploy with the calling JDeveloper application, it does only contain the META-INF/MANIFEST.MF file, with no class files. When I list the contents of jar, only this shows up. When I extract this with jar xf ... it only contains a single line of text with a version number. Where am I wrong?
Thanks, regards
Miklos HERBOLY
Edited by: mh**** on Nov 24, 2012 12:56 PM
HI EJP,
Thank you very much. This is my fault that the formulation targeted at "source code", whereby I meant the output of the javac tool--the class file. Nevertheless, the problem seems now to be solved as I navigated to the directory of the class file, executed the jar tool there and it generated a perfectly good output. I do not know what was wrong previously.
Regards,
Miklos
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import java.io.FileReader;
import java.io.FileWriter;
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endPos= tempLine.indexOf(':', fromIndex+2);
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System.out.println("Error@getFileNames : "+e);
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String reportLine = null;
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String nextLine=null;
String target=null;
String tempStr=null;
String startStr=null;
String endStr=null;
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boolean versionFlag=false;
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public ArrayList<String> loadFileContent(String selectedStr)
//System.out.println("inside loadFileContent()");
String logFilePath="";
String propFileName="";
String line="";
String choice="";
String tempStr="";
int startPos=0;
int endPos=0;
ArrayList<String> timeList=new ArrayList<String>();
String userdir = System.getProperty("user.dir");
try
logFilePath=ResourceBundle.getBundle("catconfig").getString("logFilePath");
propFileName=ResourceBundle.getBundle("catconfig").getString("propFileName");
propFileName=userdir+logFilePath+propFileName;
BufferedReader buffRead = new BufferedReader(new FileReader(propFileName));
if(selectedStr.equalsIgnoreCase("Device Discovery"))
choice="DD";
else if(selectedStr.equalsIgnoreCase("Network Discovery"))
choice="ND";
while ((line=buffRead.readLine()) != null) {
if(line.contains(choice))
System.out.println(line);
startPos=line.indexOf("_");
endPos=line.indexOf(" =");
tempStr=line.substring(startPos+1, endPos);
System.out.println("tempStr : "+tempStr);
timeList.add(tempStr);
buffRead.close();
catch(Exception e)
System.out.println("Exception@loadFileContent : "+e);
return timeList;
public String getFileName(String timeStr)
System.out.println("inside getFileName");
String logFilePath="";
String propFileName="";
String line="";
String tempStr="";
int startPos=0;
String userdir = System.getProperty("user.dir");
try
logFilePath=ResourceBundle.getBundle("catconfig").getString("logFilePath");
propFileName=ResourceBundle.getBundle("catconfig").getString("propFileName");
propFileName=userdir+logFilePath+propFileName;
BufferedReader buffRead = new BufferedReader(new FileReader(propFileName));
while ((line=buffRead.readLine()) != null) {
if(line.contains(timeStr))
System.out.println(line);
startPos=line.indexOf(" = ");
tempStr=line.substring(startPos+3, line.length());
System.out.println("tempStr : "+tempStr);
buffRead.close();
catch(Exception e)
System.out.println("Exception@loadFileContent : "+e);
return tempStr;
public ArrayList loadFile()
String logFilePath="";
String moduleFileName="";
String line="";
ArrayList<String> moduleList=new ArrayList<String>();
String userdir = System.getProperty("user.dir");
try
logFilePath=ResourceBundle.getBundle("catconfig").getString("logFilePath");
moduleFileName=ResourceBundle.getBundle("catconfig").getString("moduleFileName");
moduleFileName=userdir+logFilePath+moduleFileName;
BufferedReader buffRead = new BufferedReader(new FileReader(moduleFileName));
while ((line=buffRead.readLine()) != null) {
moduleList.add(line);
buffRead.close();
catch(Exception e)
System.out.println("Exception@loadFile : "+e);
return moduleList;
public static void main(String[] args) {
System.out.println("Inside main");
//String userdir = System.getProperty("user.dir");
//System.out.println("userdir : "+userdir);
/*ArrayList<String> fileNameList=new ArrayList<String>();
String Choice="";
String logFileName="";
String logFilePath="";
String totalLog="";
String newLog="";
String folderName="";
Choice=ResourceBundle.getBundle("catconfig").getString("Choice");
logFileName=ResourceBundle.getBundle("catconfig").getString("logFileName");
logFilePath=ResourceBundle.getBundle("catconfig").getString("logFilePath");
folderName=ResourceBundle.getBundle("catconfig").getString("folderName");
totalLog=ResourceBundle.getBundle("catconfig").getString("fileName"); */
/*try
//to write the total log
//folderCheck(folderName);
//to find the details in the given log
//findDetails();
//to split the logs accordingly
totalLog=logFilePath+totalLog;
fileNameList=getFileNames();;
System.out.println("FileNameList size = "+fileNameList.size());
for(int i=0;i<fileNameList.size();i++)
newLog=fileNameList.get(i).toString();
writeFile(totalLog,newLog);
//to analyse the logs & to produce reports
//getValuesFromFilesOnly(Choice,logFileName);
}catch (Exception e)
System.out.println(e.getMessage());
}[JSP is used for server validation.
So you need a an application server (like Tomcat or Jboss) to execute your jsp files.
you can create the .war file of your simple jsp application and put it in the server.
then you will have to access your page using a web browser.
the URL will be
http://<ComputerName or IP Address>:<PortNumber>/<WarFileName>/<MainJspPage>
(eg: http://100.100.100.252:8080/SimpleApplication/mainPage.jsp)
-Achyuth -
How to know if the current application jar file has been overwritten?
When I overwrite a jar file that is being used, the buttons that call new windows stop responding silently but is there some check I can make from within the application to know if the jar file has been overwritten, so that I can warn the user to restart it?
I know this sounds bad so let me explain why I would want this, if you don't care then skip everything below this point.
I have close to a hundred of users executing Java applications from a central repository in the network. This is important because the applications are always changing and evolving so it's important that I only have to update one binary. I do most updates after work hours so I don't have a problem there but sometimes there are critical errors that need to be corrected immediately. Depending on the amount of people using an application it may be impractical to warn and wait for everyone to close it and make everyone else wait for that so I just overwrite the files that need to be updated and then warn everyone to restart the application. The result is that buttons that call for frames that haven't been called yet stop working silently. Some users already know what to do when that happens but I want a more graceful approach. I wanted to check for this situation from inside the application so that I could inform the user of the update and provide information on what to do next. Can I do this? I tried some try and catch blocks of code but I can't seem to catch anything when that happens.You can write your own class loader that loads classes from that jar file. Make sure it isn't on the class path and when you want to create an object from that jar file, call up your class loader to do that. (You only have to do that for your "top-level" objects, within those objects creating another object will automatically be done by your class loader.)
Periodically check whether the jar has been modified. If it has, refresh the application by creating a new instance of your class loader and using that to create new instances of all your objects.
But that sounds like a lot of work just to avoid setting up an emergency change procedure where you get everybody to close their applications. -
Problem while creating JAR file for my swing application
Hi...
Using my swings application I am trying to Run different software�s .
My program is Running fine from command prompt. If I create JAR file
It is giving error like �Failed to load Main-Class manifest attribute from .jar�
Can anybody help me to creating JAR file
Thanks in advance
Cheers
Mallikhi,
User following command
jar-cmf textfile_name.txt Jarfile_name *
here you have to make manifest file
and making jar file you have reach there by command promt
and manifest file have some constraint also as well as format
format are
Manifest-Version: 1.0
Class-path: jar file name which are using in app separed by space
Created-By: 1.5.0 (Sun Microsystems Inc.)
Main-Class: Main class name
and end of file is not have carriage return -
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 PMYou 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. -
Creating JAR files programmatically
I am trying to create JAR files programmatically using the java.util.zip and java.util.jar APIs. I am starting with just a set of directories containing .class files. I can seem to make the JAR but if I try to use any of the classes in it they don't work. But, if I unzip the JAR using WinZip, the classes are usable. So I am somehow building the JAR file incorrectly. Does anyone have any ideas or suggestions? The code is pretty long so I won't post it yet but I can send it to you if you'd like to see it. Contact by email if you'd like to see the code. Thanks.
What paths are you encoding? Here are a couple of rules:
1 - All paths are '/' separated, and do not begin with a '/'.
2 - All paths are relative (see 1) and contain the exact package name of the class, plus the class.
E.G., the class java.lang.Object would look like this in your jar:
java/lang/Object.classNothing more or less. -
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:
1. create a manifest file with: Main-Class: classes.Cars
2. from within the mainLib directory (./program_name/classes/mainLib/) i do this:
jar cvf mainLib.jar manifest ./*.class
3. Then i move this jar file to ./program_name/lib and change directory to ./program name/
4. try to do this: java -jar ./lib/mainLib.jar
But it errors with:
gary@linuxbox:~/java/cars$ java -jar ./lib/mainLib.jar
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. -
Update jar file with modified class files
hi all,
I'm developing a jar utility for updating a jar file with modified class files as of now i have reached a point where in i can browse files and set it to required location
i.e i have developed a swings GUI application using JfileChooser and browse the files ..now my requirement is to update the jar files with modified class file
GUI looks like below
....enter the modified class file ----> d:\c.class
....enter the jar file path ---> d:\a.jar
update button now i have the requirement as
1> when i click on the update button ,my jar file (a.jar) should get updated with the latest class file (c.class)
can u help me to achieve this requirement.???
im stuck with this,,,if u can provide me wit the code for updating jar file with latest class file...it will really be helpful
if u can help me with the code on click on update button it will be really helpful
Thanks and expecting a faster response from u all java experts....Please find my query in bolds...i have written the partial code now,i need some help now
hope u guys can help me out...
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
public class FileExplorer extends JDialog implements ActionListener
JTextField txtLocation_class;
JButton btnBrowse_class;
JLabel label_class;
JTextField txtLocation_jar;
JButton btnBrowse_jar;
JLabel label_jar;
JButton updatebutton;
public FileExplorer()
setSize(600,300);
//for class files
label_class = new JLabel("Please select Modified Class File");
txtLocation_class= new JTextField(20);
btnBrowse_class = new JButton("Browse");
btnBrowse_class.addActionListener(this);
//for jar files
label_jar = new JLabel(" Please select the Jar file");
txtLocation_jar= new JTextField(20);
btnBrowse_jar = new JButton("Browse");
btnBrowse_jar.addActionListener(this);
ActionListener updateListener = new ActionListener(){
public void actionPerformed(ActionEvent ae){
if(ae.getActionCommand().equalsIgnoreCase("Update")){
System.out.println("ae.getActionCommand() :: "+ae.getActionCommand());
System.out.println("Update Button is pressed");
*//Query :how do i access FilePath and FilePath1 here which*
* // has been set in public void actionPerformed(ActionEvent ae)*
* //method below*
* // FilePath ---??*
* // FilePath1 ---??*
* // how do i access the above 2 parameters*
* //Query :on click of update button i have to pass*
* //two parameters FilePath and FilePath1 to*
* //perform some functionality. please help me*
* //to achieve this..how do i access Filepath and Filepath1*
* //here which has been set below.*
} // end of if
} // end of actionPerformed
};// end of ActionListener
updatebutton = new JButton("Update");
updatebutton.addActionListener(updateListener);
//adding to the panel
JPanel pnl = new JPanel();
pnl.add(label_class);
pnl.add(txtLocation_class);
pnl.add(btnBrowse_class);
pnl.add(label_jar);
pnl.add(txtLocation_jar);
pnl.add(btnBrowse_jar);
pnl.add(updatebutton);
getContentPane().add(pnl);
public void actionPerformed(ActionEvent ae)
Object obj=ae.getSource();
if(obj==btnBrowse_class)
final JFileChooser fcstudent = new JFileChooser();
int rtrnval = fcstudent.showOpenDialog(this);
if(rtrnval==JFileChooser.APPROVE_OPTION)
try
File file=fcstudent.getSelectedFile();
String path = file.getPath();
System.out.println("This is Path:"+path);
txtLocation_class.setText(""+path);
String FilePath=txtLocation_class.getText();
System.out.println("FilePath is ::"+FilePath);
catch(Exception ex)
ex.printStackTrace();
}else if(obj==btnBrowse_jar){
final JFileChooser fcstudent = new JFileChooser();
int rtrnval = fcstudent.showOpenDialog(this);
if(rtrnval==JFileChooser.APPROVE_OPTION)
try
File file=fcstudent.getSelectedFile();
String path1 = file.getPath();
System.out.println("This is Path:"+path1);
txtLocation_jar.setText(""+path1);
String FilePath1=txtLocation_jar.getText();
System.out.println("FilePath is ::"+FilePath1);
catch(Exception ex)
ex.printStackTrace();
public static void main(String arg[]){
FileExplorer Exm= new FileExplorer();
Exm.setVisible(true);
}
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