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Problem with Class loader for ResourceBundles

Posted on 1997-06-27
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Last Modified: 2013-11-23
I'm having problems with the class loader for ResourceBundles.  Here is
some background....

I've created some ListResourceBundles (eg. LabelBundle,
LabelBundle_en_US, etc.) and I've put them in a package (
com.canadatrust.util ) when I have an applet or application try and access the bundle using the following

                def_locale = Locale.getDefault();
                def_rb =
ResourceBundle.getBundle("com.canadatrust.util.LabelBundle",
def_locale);

I keep getting a missing resource exception...

                java.util.MissingResourceException: can't find resource
for com.canadatrust.util.LabelBundle_en_US

Does the resource class loader use the CLASSPATH under Win32?  I've done everything I can think of.  I've changed my CLASSPATH to point directly to the package and it still does not find it.

Any help would be appreciated.

Thanks, David

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Question by:marcil.david
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Expert Comment

by:mann061997
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Sorry if this is stating the obvious...have you compiled
your resourceBundle? I.e. is there a class file
\com\canadatrust\util\LabelBundle_en_US.class ?

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Author Comment

by:marcil.david
Comment Utility
Yes the class has been compiled
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Expert Comment

by:mann061997
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What happens if you copy the bundle to create the
default bundle "LabelBundle"? Same error message?
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Author Comment

by:marcil.david
Comment Utility
Yes I have a default bundle LableBundle under the same package com.canadatrust.util.LabelBundle.class.
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Expert Comment

by:mann061997
Comment Utility
Strange, sounds like it should be working.

How are you running your class: java, appletviewer, browser?
Which is the current directory, when you run it?
What does you CLASSPATH look like?
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Author Comment

by:marcil.david
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I'm running it from a directory called d:\javadev and my classpath is below....

SET CLASSPATH=.;d:\javadev\;c:\jdk1.1.2\lib\classes.zip;d:\javadev\fpclass.zip;

The file fpclass.zip is a zip file containing all our classes.  It is zipped with no compression and works fine for loading classes.  

Have you put any resource classes in packages and had them load?

Thanks, David

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Accepted Solution

by:
mann061997 earned 100 total points
Comment Utility
OK, I wrote a little test package to study the problem and came up with the following results:

- works OK from normal, non-zipped class files
- fails to find resources if classes are zipped

I thought the problem might be that the zip-file contains truncated 8.3 directory names (on a FAT file system) but shortening the names didn't help.

My suggestion is to keep your resource files as unzipped class files for the time being. At least your program should work then. It really looks as though there is a bug in name resolution in zip files.
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Author Comment

by:marcil.david
Comment Utility
The resource classes are not contained in the zip.  Could I ask a couple of questions about your test package.  Did you have the resource classes in the same directory (package) as the calling class?  When you loaded the class using ResourceBundle.getBundle did you qualify it with the package?

 
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Expert Comment

by:mann061997
Comment Utility
Here's my test application:
- all classes in the same package
- getBundle uses fully qualified name; this is a must!

BTW, resources were found if I ran the program from the package root directory, e.g.
   java resPkg.Test
but not if I ran the program from within the resPkg directory, e.g.
   java Test



// file Test.java ------------------------------------------
package res.resPkg;
import java.util.*;
public class Test {
  public static void main (String[] args) {
    Locale defLoc = Locale.getDefault();
    System.out.println(defLoc);
    ResourceBundle rb =
      ResourceBundle.getBundle("resPkg.labelbundle", defLoc);
    System.out.println(rb.getString("testKey"));
  }
}

// file labelbundle.java ------------------------------------
package res.resPkg;
import java.util.*;
public class labelbundle extends ListResourceBundle {
  public Object[][] getContents() {
    return contents;
  }

  static final Object[][] contents = {
    { "testKey",                "testKey_base" }
  };
}

// file labelbundle_de.java ------------------------------------
package res.resPkg;
import java.util.*;
public class labelbundle_de extends ListResourceBundle {
  public Object[][] getContents() {
    return contents;
  }

  static final Object[][] contents = {
    { "testKey",                "testKey_de" }
  };
}
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