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Logging in Tapestry is based on the Simple Logging Facade for Java (SLF4J). You can think of SLF4J as a leaner, meaner replacement for commons-logging.

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In theory, SLF4J is a wrapper around any of a number of logging systems, including Log4J or the built-in JDK logging. In practice, it is almost always used with Log4J and no additional build configuration is needed.

...

An example from the startup of a Tapestry application:

No Format
[INFO] RegistryBuilder Adding module definition for class org.apache.tapestry5.services.TapestryModule
[INFO] RegistryBuilder Adding module definition for class org.apache.tapestry5.internal.services.InternalModule
[INFO] RegistryBuilder Adding module definition for class org.apache.tapestry5.services.assets.AssetsModule
[INFO] RegistryBuilder Adding module definition for class org.apache.tapestry5.services.pageload.PageLoadModule
[INFO] RegistryBuilder Adding module definition for class org.apache.tapestry5.integration.app1.services.AppModule
[INFO] RegistryBuilder Adding module definition for class org.apache.tapestry5.integration.app1.services.TestOnlyModule
[DEBUG] Registry [  1] --> Creating proxy for service ServletApplicationInitializer
[DEBUG] Registry [  2] --> Obtaining AspectDecorator service
[DEBUG] Registry [  3] --> Creating proxy for service AspectDecorator
[DEBUG] Registry [  3] <-- Creating proxy for service AspectDecorator [59.42 ms]
[DEBUG] Registry [  2] <-- Obtaining AspectDecorator service [62.49 ms]
[DEBUG] Registry [  1] <-- Creating proxy for service ServletApplicationInitializer [113.98 ms]
[DEBUG] Registry [  1] --> Realizing service ServletApplicationInitializer
[DEBUG] Registry [  2] --> Realizing service ServletApplicationInitializer via org.apache.tapestry5.services.TapestryModule.buildServletApplicationInitializer(Logger, List, ApplicationInitializer) (at TapestryModule.java:1398)
[DEBUG] Registry [  3] --> Constructing module class org.apache.tapestry5.services.TapestryModule
[DEBUG] Registry [  4] --> Determining injection value for parameter #1 (org.apache.tapestry5.ioc.services.PipelineBuilder)
[DEBUG] Registry [  5] --> Creating proxy for service MasterObjectProvider
[DEBUG] Registry [  5] <-- Creating proxy for service MasterObjectProvider [5.77 ms]
[DEBUG] Registry [  5] --> Realizing service MasterObjectProvider
[DEBUG] Registry [  6] --> Realizing service MasterObjectProvider via org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl(List, OperationTracker) (at MasterObjectProviderImpl.java:32) via org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at TapestryIOCModule.java:49)
[DEBUG] Registry [  7] --> Invoking constructor org.apache.tapestry5.ioc.internal.services.MasterObjectProviderImpl(List, OperationTracker) (at MasterObjectProviderImpl.java:32) via org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at TapestryIOCModule.java:49)
[DEBUG] Registry [  8] --> Determining injection value for parameter #1 (java.util.List)
[DEBUG] Registry [  9] --> Collecting ordered configuration for service MasterObjectProvider
[DEBUG] Registry [ 10] --> Invoking method org.apache.tapestry5.ioc.services.TapestryIOCModule.setupObjectProviders(OrderedConfiguration, ServiceOverride) (at TapestryIOCModule.java:131).
[DEBUG] Registry [ 11] --> Determining injection value for parameter #1 (org.apache.tapestry5.ioc.OrderedConfiguration)
[DEBUG] Registry [ 11] <-- Determining injection value for parameter #1 (org.apache.tapestry5.ioc.OrderedConfiguration) [0.17 ms]
[DEBUG] Registry [ 11] --> Determining injection value for parameter #2 (org.apache.tapestry5.ioc.services.ServiceOverride)
[DEBUG] Registry [ 12] --> Creating proxy for service ServiceOverride
[DEBUG] Registry [ 12] <-- Creating proxy for service ServiceOverride [4.12 ms]
[DEBUG] Registry [ 11] <-- Determining injection value for parameter #2 (org.apache.tapestry5.ioc.services.ServiceOverride) [4.71 ms]
[DEBUG] Registry [ 11] --> Creating proxy for service UpdateListenerHub
[DEBUG] Registry [ 11] <-- Creating proxy for service UpdateListenerHub [6.83 ms]
[DEBUG] Registry [ 11] --> Realizing service UpdateListenerHub
[DEBUG] Registry [ 12] --> Realizing service UpdateListenerHub via org.apache.tapestry5.ioc.internal.services.UpdateListenerHubImpl() (at UpdateListenerHubImpl.java:27) via org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at TapestryIOCModule.java:49)
[DEBUG] Registry [ 13] --> Invoking constructor org.apache.tapestry5.ioc.internal.services.UpdateListenerHubImpl() (at UpdateListenerHubImpl.java:27) via org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at TapestryIOCModule.java:49)
[DEBUG] Registry [ 13] <-- Invoking constructor org.apache.tapestry5.ioc.internal.services.UpdateListenerHubImpl() (at UpdateListenerHubImpl.java:27) via org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at TapestryIOCModule.java:49) [0.85 ms]
[DEBUG] Registry [ 12] <-- Realizing service UpdateListenerHub via org.apache.tapestry5.ioc.internal.services.UpdateListenerHubImpl() (at UpdateListenerHubImpl.java:27) via org.apache.tapestry5.ioc.services.TapestryIOCModule.bind(ServiceBinder) (at TapestryIOCModule.java:49) [1.58 ms]
[DEBUG] Registry [ 11] <-- Realizing service UpdateListenerHub [1.83 ms]
[DEBUG] Registry [ 10] <-- Invoking method org.apache.tapestry5.ioc.services.TapestryIOCModule.setupObjectProviders(OrderedConfiguration, ServiceOverride) (at TapestryIOCModule.java:131). [47.85 ms]
[DEBUG] Registry [ 10] --> Invoking method org.apache.tapestry5.services.TapestryModule.contributeMasterObjectProvider(OrderedConfiguration, ObjectProvider, ObjectLocator) (at TapestryModule.java:802).
[DEBUG] Registry [ 11] --> Determining injection value for parameter #1 (org.apache.tapestry5.ioc.OrderedConfiguration)
[DEBUG] Registry [ 11] <-- Determining injection value for parameter #1 (org.apache.tapestry5.ioc.OrderedConfiguration) [0.11 ms]
[DEBUG] Registry [ 11] --> Determining injection value for parameter #2 (org.apache.tapestry5.ioc.ObjectProvider)
. . .

Configuring Tapestry for other Logging Toolkits

...

You can exclude some of the dependencies that Tapestry introduces, and replace them with your own. For example, to switch over to JDK logging, update your pom as follows:

Code Block
languagexml
 
  <dependencies>
    <dependency>
      <groupId>org.apache.tapestry</groupId>
      <artifactId>tapestry-ioc</artifactId>
      <version>5.3</version>
      <exclusions>
      
        <exclusion>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-log4j12</artifactId>
        </exclusion>
      
        <exclusion>
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
        </exclusion>

      </exclusions>
    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
          <artifactId>slf4j-jdk14</artifactId>
          <version>1.4.3</version>
    </dependency>
  </dependencies>

This pulls out the log4j support normally included with Tapestry, and replaces it with the SLF4J library that wraps around JDK 1.4 logging.

In all likelihood, you'll replace tapestry-ioc with tapestry-core (assuming you are building a web application using Tapestry, rather than using Tapestry IoC as part of some other application). And, of course, version numbers change all the time!

 

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