Uploaded image for project: 'JBoss Enterprise Application Platform'
  1. JBoss Enterprise Application Platform
  2. JBEAP-15028

[GSS](7.1.z) URL.getContent() returns VirtualFile instead of ImageProducer

    XMLWordPrintable

Details

    • Bug
    • Resolution: Done
    • Major
    • 7.1.5.CR1, 7.1.5.GA
    • 7.1.3.GA
    • VFS
    • None
    • Workaround Exists
    • Hide

      Read the content directly such as with ImageIO.read(url.openStream().getSource() 

      import java.awt.Image;
import javax.imageio.ImageIO;
import java.io.InputStream;
import java.beans.SimpleBeanInfo;

            URL url = Thread.currentThread().getContextClassLoader().getResource(resourceName);
            InputStream is = null;
            try {
               is = url.openStream();
               return ImageIO.read(is).getSource();
            } catch(Exception e) {
               e.printStackTrace();
               return null;
            } finally {
               try { is.close(); } catch(Exception e) { } 
            }
      Show
      Read the content directly such as with ImageIO.read(url.openStream().getSource() import java.awt.Image; import javax.imageio.ImageIO; import java.io.InputStream; import java.beans.SimpleBeanInfo; URL url = Thread .currentThread().getContextClassLoader().getResource(resourceName); InputStream is = null ; try { is = url.openStream(); return ImageIO.read(is).getSource(); } catch (Exception e) { e.printStackTrace(); return null ; } finally { try { is.close(); } catch (Exception e) { } }
    • Hide

      Here are an example class and a jsp to reproduce the problem:

      LoadImageTest.java
      package example.loadimage.fail;
import java.awt.Image;
import java.beans.SimpleBeanInfo;
public class LoadImageTest extends SimpleBeanInfo {
	public Image image;

	public LoadImageTest(){
		image = loadImage2("icon.png");
	}
	public static void main(String[] args) {
		LoadImageTest test = new LoadImageTest();
		System.out.println("Is image null? " + (test.image == null));
	}
	// Note: This method was pulled out of the JDK src file for SimpleBeanInfo.java.
	// This allows for easier debugging, you can actually see the local variables.
	public java.awt.Image loadImage2(final String resourceName) {
		try {
			final Class c = getClass();
			java.awt.image.ImageProducer ip = (java.awt.image.ImageProducer)
			java.security.AccessController.doPrivileged(
			new java.security.PrivilegedAction() {
				public Object run() {
					java.net.URL url;
					if ((url = c.getResource(resourceName)) == null) {
						return null;
					} else {
						try {
							return url.getContent();
						} catch (java.io.IOException ioe) {
							return null;
						}
					}
				}
			});
			if (ip == null)
			return null;
			java.awt.Toolkit tk = java.awt.Toolkit.getDefaultToolkit();
			return tk.createImage(ip);
		} catch (Exception ex) {
			// will end up here because the PrivilegedAction returns something that cannot be cast
			// to an ImageProducer when this is run in JBoss AS 6.0.0.FINAL. In JBoss the returned
			// object will be a VirtualFile instead of an ImageProducer.
			return null;
		}
	}
}

      <%@page import=" example.loadimage.fail.LoadImageTest"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
out.print("Testing<br />");
LoadImageTest test = new LoadImageTest();
out.print("Is test.image null? " + (test.image == null) + "<br />");
%>
</body>
</html>
      Show
      Here are an example class and a jsp to reproduce the problem: LoadImageTest.java package example.loadimage.fail; import java.awt.Image; import java.beans.SimpleBeanInfo; public class LoadImageTest extends SimpleBeanInfo { public Image image; public LoadImageTest(){ image = loadImage2( "icon.png" ); } public static void main( String [] args) { LoadImageTest test = new LoadImageTest(); System .out.println( "Is image null ? " + (test.image == null )); } // Note: This method was pulled out of the JDK src file for SimpleBeanInfo.java. // This allows for easier debugging, you can actually see the local variables. public java.awt.Image loadImage2( final String resourceName) { try { final Class c = getClass(); java.awt.image.ImageProducer ip = (java.awt.image.ImageProducer) java.security.AccessController.doPrivileged( new java.security.PrivilegedAction() { public Object run() { java.net.URL url; if ((url = c.getResource(resourceName)) == null ) { return null ; } else { try { return url.getContent(); } catch (java.io.IOException ioe) { return null ; } } } }); if (ip == null ) return null ; java.awt.Toolkit tk = java.awt.Toolkit.getDefaultToolkit(); return tk.createImage(ip); } catch (Exception ex) { // will end up here because the PrivilegedAction returns something that cannot be cast // to an ImageProducer when this is run in JBoss AS 6.0.0.FINAL. In JBoss the returned // object will be a VirtualFile instead of an ImageProducer. return null ; } } } <%@page import= " example.loadimage.fail.LoadImageTest" %> <%@ page language= "java" contentType= "text/html; charset=ISO-8859-1" pageEncoding= "ISO-8859-1" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" > <html> <head> <meta http-equiv= "Content-Type" content= "text/html; charset=ISO-8859-1" > <title> Insert title here </title> </head> <body> <% out.print( "Testing <br /> " ); LoadImageTest test = new LoadImageTest(); out.print( "Is test.image null? " + (test.image == null) + " <br /> " ); %> </body> </html>

    Description

      URL.getContent() behaves differently within JBoss than it does in a normal JVM. In our case, when a jar is used in a normal JVM, URL.getContent() returns an ImageProducer. When the same jar is used from within JBoss, a VirtualFile is returned which then causes a ClassCastException.

      Note: This worked fine in JBoss 4.2.3.GA.

      Attachments

        Issue Links

          clones

          Bug - A problem that impairs or prevents the functions of the product. JBAS-9399 URL.getContent() returns VirtualFile instead of ImageProducer in JBoss AS 6.0.0.FINAL

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Open
          is cloned by

          Bug - A problem that impairs or prevents the functions of the product. JBVFS-206 URL.getContent() returns VirtualFile instead of ImageProducer

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Resolved

          Bug - A problem that impairs or prevents the functions of the product. WFLY-10706 URL.getContent() returns VirtualFile instead of ImageProducer

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed
          is incorporated by

          Component Upgrade - A task tracking an update to a bundled component or revision of component upstream of the project. JBEAP-15072 [GSS](7.1.z) Upgrade jboss-vfs to 3.2.13.Final

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed

          Activity

            People

              thofman Tomas Hofman
              rhn-support-bmaxwell Brad Maxwell
              Peter Mackay Peter Mackay
              Peter Mackay Peter Mackay
              Votes:
              0 Vote for this issue
              Watchers:
              8 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: