JEditorPane doesn't load html file when jar executable run

**dancaer69** · November 12th, 2013, 05:59 AM

I'm working on a project which include a JEditorPane in which should loaded an html file from project's dir. The problem is that when I build and run the project, all works fine, and the html loads and works without any errors on JEditorPane, but when I build it(without any errors) and use the jar executable I get

IOException->invalid URL

instead of loading the file. All other resources(strings, images) loading fine too. This is the code for JEditorPane:

private void bHelpActionPerformed(java.awt.event.ActionEvent evt) {                                      
    fHelp.setVisible(true);
 
    URL pageURL;
    pageURL = getClass().getResource("/com/soft/snshut/LangChooser.html");
    epHelp.setEditable(false);
    epHelp.addHyperlinkListener(new HyperlingListener());
    try {
        epHelp.setPage(pageURL);
    }catch(IOException e){
        epHelp.setText("IOExecption while loading help page.");
    }
}

Is something I'm doing wrong?

**Norm** · November 12th, 2013, 07:33 AM

Add a call to printStackTrace() to the exception's catch block to get the full text of the error message.
Also add a println() to print out the URL to the page. Compare the value when the code works and when if fails.

I think the getResource() method searches on the classpath for the file. Is the path in the URL on the classpath?

**dancaer69** · November 12th, 2013, 09:23 AM

I'm pretty new in java developing, so I'm not sure if I understand all that you say, but I've managed to get the printStackTrace:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at java.lang.Throwable.printStackTrace(Throwable.java:653)
        at java.lang.Throwable.printStackTrace(Throwable.java:643)
        at com.snShut.ShutdownForm.bHelpActionPerformed(ShutdownForm.java:954)
        at com.snShut.ShutdownForm.access$3800(ShutdownForm.java:59)
        at com.snShut.ShutdownForm$21.actionPerformed(ShutdownForm.java:612)
        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
        at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
        at java.awt.Component.processMouseEvent(Unknown Source)
        at javax.swing.JComponent.processMouseEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
        at java.awt.EventQueue.access$200(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.awt.EventQueue$3.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue$4.run(Unknown Source)
        at java.awt.EventQueue$4.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)

I have the file in /com/snshut/pages, but I've tried to put it directly to project's folder: /com/snshut
and the result is the same.

**Norm** · November 12th, 2013, 09:31 AM

What is printed out for the value of the URL for when the code works and for when it does not work?
Print the value of pageURL right after the call to getResource();

What is the value of the classpath? Add the following statement after the above println() statement:

      System.out.println("classpath=" + System.getProperty("java.class.path"));

**dancaer69** · November 12th, 2013, 09:43 AM

When I run it in Netbeans this is the classpath output:

classpath=C:\Program Files (x86)\NetBeans 7.4\java\modules\ext\AbsoluteLayout.jar;C:\Users\g\Documents\NetBeansProjects\SnShut\build\classes

and when I run the jar from command line the classpath output is:

classpath=snShut.jar

Also println for URL is:

file:/C:/Users/g/Documents/NetBeansProjects/SnShut/build/classes/com/snshut/pages/LangChooser.html

when run works and:

null

when run the jar from command line.

**Norm** · November 12th, 2013, 09:52 AM

The getResource() method uses the classpath to find the resource.
In the IDE the classpath included:
C:\Users\giannis\Documents\NetBeansProjects\Snooze Shutdown\build\classes
and the path to the file was:
file:/C:/Users/giannis/Documents/NetBeansProjects/SnoozeShutdown/build/classes/com/d69soft/snoozeshutdown/pages/LangChooser.html

Notice that the com folder was in the classes folder which was where the classpath pointed. getResources() appended the path given it to the classpath to find the full path to the file.

From the commandline the classpath was only to the jar file.

I can't remember the technique and will have to experiment.
You might try adding a Class-Path: . entry to the jar file's manifest and see what happens.

**dancaer69** · November 12th, 2013, 10:04 AM

Here is the generated manifest file:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.9.1
Created-By: 1.7.0_21-b11 (Oracle Corporation)
Class-Path: lib/AbsoluteLayout.jar
X-COMMENT: Main-Class will be added automatically by build
Main-Class: com.snShutn.ShutdownForm

I tried to put the "." in place of lib/AbsoluteLayout.jar and in front of lib...(.lib), but I always get invalid or corrupt manifest file.
I also tried to add the
Class-Path:.
entry without change the existing, but the result was the same.

**Norm** · November 12th, 2013, 10:22 AM

Sorry, I do not know how to make your IDE change the manifest file it uses.
I tried this experiment:

//  Test using getResource() from jar
 
import java.net.*;
 
 
public class TestgetResource {
 
	public static void main(String[] args) {
		new TestgetResource();
	}
	public TestgetResource() {
	  System.out.println("classpath=" + System.getProperty("java.class.path"));
 
	  URL pageURL = getClass().getResource("/images/duke.gif");   //  null if file not found
	  System.out.println("url="+pageURL);
   }
}
/*
//  Run from class:
Running: java -cp . TestgetResource
 
classpath=.
url=file:/D:/JavaDevelopment/Testing/ForumQuestions9/images/duke.gif
 
0 error(s)
 
>>>>>>>>>>>>From jar with Class-Path: .        //  NOTE Classpath shows only jar BUT url good
D:\BatchFiles>cmd.exe /K cd "D:\JavaDevelopment\Testing\ForumQuestions9"
 
D:\JavaDevelopment\Testing\ForumQuestions9>java -jar TestgetResource.jar
classpath=TestgetResource.jar
url=file:/D:/JavaDevelopment/Testing/ForumQuestions9/images/duke.gif
 
D:\JavaDevelopment\Testing\ForumQuestions9>
 
>>>>>>>>>>>>From jar w/o Class-Path: .       //  NOTE Classpaht only jar and url null<<<<
D:\BatchFiles>cmd.exe /K cd "D:\JavaDevelopment\Testing\ForumQuestions9"
 
D:\JavaDevelopment\Testing\ForumQuestions9>java -jar TestgetResource.jar
classpath=TestgetResource.jar
url=null
 
D:\JavaDevelopment\Testing\ForumQuestions9>
 
*/

With this manifest file:

Manifest-Version: 1.0
Main-Class: TestgetResource
Class-Path: .

The results are shown in comments at the end of the source.
The ForumQuestions9 folder contains the images folder. The class-path: . would point to the ForumsQuestions9 folder. I'm surprised that the java.class.path value didn't show that.

For me, adding the Class-Path: . worked.

**dancaer69** · November 12th, 2013, 10:46 AM

Ok, thanks for your affort. I suppose I need to ask to the netbeans forum.

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