Maven 2 Maven调试输出：（f）是什么意思？

当您使用-X标志运行Maven 2，并观察它配置插件时，您可能会看到如下输出：

[DEBUG] Configuring mojo 'org.apache.maven.plugins:maven-clean-plugin:2.3:clean' -->
[DEBUG]   (f) directory = e:\projects\foobar\target
[DEBUG]   (f) excludeDefaultDirectories = false
[DEBUG]   (f) failOnError = true
[DEBUG]   (s) directory = .
[DEBUG]   (s) includes = [**/*~]
[DEBUG]   (f) filesets = [file set: . (included: [**/*~], excluded: [])]
[DEBUG]   (f) followSymLinks = false
[DEBUG]   (f) outputDirectory = e:\projects\foobar\target\classes
[DEBUG]   (f) project = MavenProject: foobar:foobar:1.0-SNAPSHOT @ e:\projects\foobar\pom.xml
[DEBUG]   (f) reportDirectory = e:\projects\foobar\target\site
[DEBUG]   (f) skip = false
[DEBUG]   (f) testOutputDirectory = e:\projects\foobar\target\test-classes
[DEBUG] -- end configuration --

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（f）和（s）之间的区别是什么？有趣的问题。我从来没有注意过这个小细节，也找不到任何关于它的文档。因此，我对源代码进行了greed，这是我们可以在（maven core）中看到的：

（f）和（s）之间的区别现在应该是自我解释（叹气）

public void notifyFieldChangeUsingSetter( String fieldName, Object value, Object target )
{
    if ( logger.isDebugEnabled() )
    {
        logger.debug( "  (s) " + fieldName + " = " + toString( value ) );
    }
}

public void notifyFieldChangeUsingReflection( String fieldName, Object value, Object target )
{
    if ( logger.isDebugEnabled() )
    {
        logger.debug( "  (f) " + fieldName + " = " + toString( value ) );
    }
}