How to send java.util.logging to log4j?
One approach I have used successfully is to use slf4j as my primary logging API. I then have slf4j bind to log4j. 3rd party dependencies using other frameworks (like JUL) can be bridged to slf4j.
slf4j
What is the difference between Log4j, SLF4J and Logback?
Check out their home pages: SLF4J – The Simple Logging Facade for Java (SLF4J) serves as a simple facade or abstraction1 for various logging frameworks (e.g. java.util.logging, logback, log4j) allowing the end user to plug in the desired logging framework at deployment time. 1) It is not itself a logging library, but a generic interface … Read more
How to log exception and message with placeholders with SLF4J
As of SLF4J version 1.6, SLF4J will interpret the last parameter as you intended, i.e. as an exception. You must be using an older version of SLF4J API. This feature is documented in a faq entry which is also referenced in the javadocs for Logger.
Logging framework incompatibility
You are mixing the 1.5.6 version of the jcl bridge with the 1.6.0 version of the slf4j-api; this won’t work because of a few changes in 1.6.0. Use the same versions for both, i.e. 1.6.1 (the latest). I use the jcl-over-slf4j bridge all the time and it works fine.
What’s Up with Logging in Java? [closed]
In chronological order of api apperance (as far as I know): Log4j because most everybody uses it (in my experience) Commons Logging because open source projects use it (so they can integrate with whatever logging framework is used in the integrated solution); especially valid if you’re an API/Framework/OSS and you rely on other packages that … Read more
How do you configure logging in Hibernate 4 to use SLF4J
Look to https://github.com/jboss-logging/jboss-logging/blob/master/src/main/java/org/jboss/logging/LoggerProviders.java: static final String LOGGING_PROVIDER_KEY = “org.jboss.logging.provider”; private static LoggerProvider findProvider() { // Since the impl classes refer to the back-end frameworks directly, if this classloader can’t find the target // log classes, then it doesn’t really matter if they’re possibly available from the TCCL because we won’t be // able to find … Read more
SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”. error
I can also confirm this error. Workaround: is to use external maven inside m2eclipse, instead of it’s embedded maven. That is done in three steps: 1 Install maven on local machine (the test-machine was Ubuntu 10.10) mvn –version Apache Maven 2.2.1 (rdebian-4) Java version: 1.6.0_20 Java home: /usr/lib/jvm/java-6-openjdk/jre Default locale: de_DE, platform encoding: UTF-8 OS … Read more
Setting log level of message at runtime in slf4j
There is no way to do this with slf4j 1.x. I imagine that the reason that this functionality is missing is that it is next to impossible to construct a Level type for slf4j that can be efficiently mapped to the Level (or equivalent) type used in all of the possible logging implementations behind the … Read more
How to intercept SLF4J (with logback) logging via a JUnit test?
The Slf4j API doesn’t provide such a way but Logback provides a simple solution. You can use ListAppender : a whitebox logback appender where log entries are added in a public List field that we could use to make our assertions. Here is a simple example. Foo class : import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class … Read more
Logger slf4j advantages of formatting with {} instead of string concatenation
It is about string concatenation performance. It’s potentially significant if your have dense logging statements. (Prior to SLF4J 1.7) But only two parameters are possible Because the vast majority of logging statements have 2 or fewer parameters, so SLF4J API up to version 1.6 covers (only) the majority of use cases. The API designers have … Read more