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However, to use this successfully applications must meet the following requirements:. For the most part, converting from the Log4j 1. Many of the log statements will require no modification. However, where necessary the following changes must be made. Although the Log4j 2 configuration syntax is different than that of Log4j 1. See the Lookups documentation for more details. For example, using a lookup for the system property named catalina.

Log4j 1.

Logging in Java with the JDK 1.4 Logging API and Apache Log4j

The Log4j 1. The log4j Below are the example configurations for Log4j 1.

Java logging explained in 3 min

This example from Log4j 1. The SocketAppender does not actually use a Layout. Configuring one will have no effect.

Logging in Java with the JDK Logging API and Apache log4j | SpringerLink

Log4j 2 XML configuration. Note that the Async Appender should be configured after the appenders it references.


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This will allow it to shutdown properly. All Rights Reserved. Site powered by Twitter Bootstrap. To switch logging frameworks, just replace slf4j bindings on your class path. For example, to switch from java. SLF4J does not rely on any special class loader machinery. In fact, each SLF4J binding is hardwired at compile time to use one and only one specific logging framework.

For example, the slf4j-log4j In your code, in addition to slf4j-api Do not place more than one binding on your class path.

The Logging Mess

Here is a graphical illustration of the general idea. The SLF4J interfaces and their various adapters are extremely simple. Most developers familiar with the Java language should be able to read and fully understand the code in less than one hour. No knowledge of class loaders is necessary as SLF4J does not make use nor does it directly access any class loaders. Given the simplicity of the SLF4J interfaces and its deployment model, developers of new logging frameworks should find it very easy to write SLF4J bindings.

Table of contents

Authors of widely-distributed components and libraries may code against the SLF4J interface in order to avoid imposing an logging framework on their end-user. Thus, the end-user may choose the desired logging framework at deployment time by inserting the corresponding slf4j binding on the classpath, which may be changed later by replacing an existing binding with another on the class path and restarting the application.

This approach has proven to be simple and very robust. As of SLF4J version 1. In order to avoid imposing a logging framework on the end-user, Wombat's distribution includes slf4j-api. Even in the absence of any SLF4J binding on the class path, Wombat's distribution will still work out-of-the-box, and without requiring the end-user to download a binding from SLF4J's web-site.

Only when the end-user decides to enable logging will she need to install the SLF4J binding corresponding to the logging framework chosen by her. Basic rule Embedded components such as libraries or frameworks should not declare a dependency on any SLF4J binding but only depend on slf4j-api. When a library declares a transitive dependency on a specific binding, that binding is imposed on the end-user negating the purpose of SLF4J.

Note that declaring a non-transitive dependency on a binding, for example for testing, does not affect the end-user. SLF4J usage in embedded components is also discussed in the FAQ in relation with logging configuration , dependency reduction and testing. Given Maven's transitive dependency rules, for "regular" projects not libraries or frameworks declaring logging dependencies can be accomplished with a single dependency declaration.

In addition to logback-classic Note that explicitly declaring a dependency on logback-core In addition to slf4j-log4j Note that explicitly declaring a dependency on log4j In addition to slf4j-jdk Note that explicitly declaring a dependency on slf4j-api An SLF4J binding designates an artifact such as slf4j-jdk From the client's perspective all versions of slf4j-api are compatible.

Client code compiled with slf4j-api-N. You only need to ensure that the version of your binding matches that of the slf4j-api. You do not have to worry about the version of slf4j-api.


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  4. Mixing different versions of slf4j-api. For example, if you are using slf4j-api However, from the client's perspective all versions of slf4j-api are compatible. You can always use any version of slf4j-api. At initialization time, if SLF4J suspects that there may be an slf4j-api vs. It is common to find projects depending on a combination of JCL, java.

    It then becomes desirable to consolidate logging through a single channel. For more details, please refer to the page on Bridging legacy APIs.

    FAQ (User Guide)

    MDC data can also be highly helpful in filtering messages or triggering certain actions. Note that at this time, only log4j and logback offer MDC functionality. If the underlying framework does not offer MDC, for example java. Thus, as a SLF4J user, you can take advantage of MDC information in the presence of log4j or logback, but without forcing these logging frameworks upon your users as dependencies.

    Similarly, log4j-over-slf4j. See the page on Bridging legacy APIs for more details. Hello World As customary in programming tradition, here is an example illustrating the simplest way to output "Hello world" using SLF4J.