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I am trying to run GWT RequestFactory and facing this error:
ClassNotFoundException: org.slf4j.LoggerFactory I have tried to download slf4j-api-1.3.1.jar but it didnt resolve the issue
Any idea exactly which jar I need to download ?
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The LoggerFactory class of the org. slf4j package is a utility class, which is used to generate loggers for various logging APIs such as log4j, JUL, NOP and simple logger.
The LoggerFactory is a utility class producing Loggers for various logging APIs, most notably for log4j, logback and JDK 1.4 logging. Other implementations such as NOPLogger and SimpleLogger are also supported.
So essentially, SLF4J does not replace log4j; they both work together. It removes the dependency on log4j from your application and makes it easy to replace it in the future with the more capable library.
Better to always download as your first try, the most recent version from the developer's site
I had the same error message you had, and by downloading the jar from the above (slf4j-1.7.2.tar.gz most recent version as of 2012OCT13), untarring, uncompressing, adding 2 jars to build path in eclipse (or adding to classpath in comand line):
slf4j-api-1.7.2.jarslf4j-simple-1.7.2.jarI was able to run my program.
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