![]() There is no need to explicitly "grab" available-by-default, but is used to specify dependencies on the other three logging frameworks. ![]() The script takes advantage of Groovy's built-in support to find its dependencies on the various logging frameworks. * module='commons-logging-api', version='1.1')ĭef javaUtilLogger = new JavaUtilLoggerClass()ĭef commonsLogger = new ApacheCommonsLoggerClass() * An example of specifying the Apache Commons Logging dependency via is at * An example of specifying the Log4j dependency via is at * be selected from 'slf4j-nop', 'slf4j-simple', 'slf4j-log4j12.jar', * specifying no or more than one of the actual logging binding libraries to * "Failed to load class "" that is caused by * Specifying 'slf4j-simple' rather than 'slf4j-api' to avoid the error Grab SLF4J, Log4j, and Apache Commons Logging dependencies using No need to "grab" : it's part of the JDK! The next Groovy code listing shows a script that makes use of these classes and demonstrates the workings of the respective injected loggers.ĭoovy #!/usr/bin/env groovy The above four Groovy classes are very similar, but each one takes advantage of a different Groovy 1.8 logger injection. oovy - Demonstrates for import JavaUtilLoggerClass I first list four simple Groovy classes, one for each of the four logging frameworks for which Groovy 1.8 provides logger transformations. These logger annotations are easily demonstrated in the following Groovy code snippets. A Log4j logger is injected with the annotation, an Apache Commons Logging logger is injected with the annotation, and an SLF4J logger is injected with the annotation. Just as the annotation injects a logger, there are different annotations that do the same thing for the other three previously mentioned logging frameworks. Here name is a place holder for info, fine, finer, finest, config, warning, severe.Īs the Groovydoc documentation for indicates, using code like log.info(expression) is mapped to a conditional logging guard call before actually invoking that named method (info in this case) on the logger. ![]() Its Groovydoc states the following regarding use of to inject the Log4j logger: The method name will be used to determine what to call on the logger. The annotation is used to inject a logger. Each AST does more than simply inject the logger each also automatically wraps all calls to logging methods with checks for the logging level being set sufficiently to log at that level. The annotation is different for each of these logging frameworks, but the effect is the same: each injects the respective logger into the annotated class accessible by a "log" variable name handle. Groovy 1.8 provides AST Transformations for annotation-based logged injection for four of the most popular Java logging frameworks: the standard, Log4j, Apache Commons Logging, and Simple Logging Facade for Java (SLF4J). ![]() I focus on one of these new features, logger injection via new AST Transformations, in this post. Groovy 1.8 was recently released with a long list of new features. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |