I could not run log4j in untrusted applets until I added this
patch to Category. The difficulty was that the code was
handling a security exception in the first check to System.getProperty()
correctly, but then turned around and issued another check to
System.getProperty()
without any SecurityException handling code!
Anyway a simple little fix, included for those who are interested in it.
Thanks!
Steve
/** Search for the properties file log4j.properties in the CLASSPATH. */
static {
String override = null;
try {
override=System.getProperty(DEFAULT_INIT_OVERRIDE_KEY, override);
} catch(SecurityException e) {
LogLog.debug("Could not read system property \""+
DEFAULT_INIT_OVERRIDE_KEY +
"\", assuming default value of false.", e);
}
// if there is no default init override, them get the resource
// specified by the user or the default config file.
if(override == null || "false".equalsIgnoreCase(override)) {
// Handle security exception again
String resource = null;
try {
resource = System.getProperty(DEFAULT_CONFIGURATION_KEY,
DEFAULT_CONFIGURATION_FILE);
} catch(SecurityException e) {
LogLog.debug("Could not read system property \""+
DEFAULT_CONFIGURATION_KEY +
"\", assuming default configuration file \"" +
DEFAULT_CONFIGURATION_FILE + "\".", e);
resource = DEFAULT_CONFIGURATION_FILE;
}
URL url = null;
try {
url = new URL(resource);
} catch (MalformedURLException ex) {
// so, resource is not a URL:
// attempt to get the resource in the most generic way:
url = Category.class.getResource(resource);
if(url == null) {
// if that doen't work, then try again in a slightly
// different way
ClassLoader loader = Category.class.getClassLoader();
if(loader != null) {
url = loader.getResource(resource);
}
}
}
// If we have a non-null url, then delegate the rest of the
// configuration to the OptionConverter.selectAndConfigure
// method.
if(url != null) {
OptionConverter.selectAndConfigure(url, defaultHierarchy);
} else {
LogLog.debug("Could not find resource: ["+resource+"].");
}
}
}
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