https://issues.apache.org/bugzilla/show_bug.cgi?id=49628
Summary: log4j fails to work in an applet environment
Product: Log4j
Version: 1.2
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Configurator
AssignedTo: log4j-dev@logging.apache.org
ReportedBy: ily...@gmail.com
Created an attachment (id=25792)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=25792)
The simplest possible example project for which the exception can be reproduced
When used within the simple applet below log4j throws a
NoClassDefFoundException and can even prevent the applet from working in the
browser _when opened from a website_ (it seems to work with no errors locally).
See the attachment for the whole project:
public class MyApplet extends JApplet {
public static Logger logger = Logger.getLogger(MyApplet.class);
public MyApplet() {
logger.debug("MyApplet::constructor() start");
JButton button = new JButton("Hello, world!");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(MyApplet.this, "Hi there!");
}
});
add(button);
logger.debug("MyApplet::constructor() end");
}
@Override
public void init() {
logger.debug("MyApplet.init()");
}
}
log4j:WARN Error during default initialization
java.lang.NoClassDefFoundError: IllegalName: <!DOCTYPE html PUBLIC "-//W3C//DTD
XHTML 1.0 Strict//EN"
at java.lang.ClassLoader.preDefineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at javax.xml.parsers.FactoryFinder.getProviderClass(Unknown Source)
at javax.xml.parsers.FactoryFinder.newInstance(Unknown Source)
at javax.xml.parsers.FactoryFinder.findJarServiceProvider(Unknown Source)
at javax.xml.parsers.FactoryFinder.find(Unknown Source)
at javax.xml.parsers.DocumentBuilderFactory.newInstance(Unknown Source)
at
org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:849)
at
org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:773)
at
org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:483)
at org.apache.log4j.LogManager.<clinit>(LogManager.java:127)
at org.apache.log4j.Logger.getLogger(Logger.java:117)
at MyApplet.<clinit>(MyApplet.java:12)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$12.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(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)
log4j:WARN No appenders could be found for logger (MyApplet).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more
info.
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