Hi,
I get this warning in my Eclipse console (using WTP to connect to
WebLogic 10.3):
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [zip:C:/Documents and
Settings/Owner.ZEN/.m2/repository/org/slf4j/slf4j-log4j12/1.5.8/slf4j-log4j12-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [zip:C:/Documents and
Settings/Owner.ZEN/.m2/repository/org/slf4j/slf4j-log4j12/1.5.8/slf4j-log4j12-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
explanation.
Somehow, it's seeing multiple bindings, when they are in fact the same.
I'm not sure how this is happening (I use Maven and the
maven-eclipse-plugin for configuration). Referencing this code from
LoggerFactory:
private static String STATIC_LOGGER_BINDER_PATH =
"org/slf4j/impl/StaticLoggerBinder.class";
private static void singleImplementationSanityCheck() {
try {
Enumeration paths = LoggerFactory.class.getClassLoader().getResources(
STATIC_LOGGER_BINDER_PATH);
List implementationList = new ArrayList();
while (paths.hasMoreElements()) {
URL path = (URL) paths.nextElement();
implementationList.add(path);
}
if (implementationList.size() > 1) {
Util
.reportFailure("Class path contains multiple SLF4J bindings.");
for(int i = 0; i < implementationList.size(); i++) {
Util.reportFailure("Found binding in
["+implementationList.get(i)+"]");
}
Util.reportFailure("See " + MULTIPLE_BINDINGS_URL
+ " for an explanation.");
}
} catch (IOException ioe) {
Util.reportFailure("Error getting resources from path", ioe);
}
}
... somehow, the Enumeration "paths" must have 2 elements that happen to
be identical -- probably due to my multiple WAR within EAR config (if I
shared my utility JAR at the EAR level, this probably won't show up).
Simple fix: change implementationList from List to Set -- this way there
will be no duplicates.
Best regards,
Ari
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