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Merge pull request #1279 from jvz:updated-logging-docs 

* pr/1279:
  Polish contribution
  Update logging documentation to include Log4j 2
This commit is contained in:
Stephane Nicoll 2017-01-20 17:18:12 +01:00
parent 0b08d0a246 3e15573628
commit ab5f3e733b
1 changed files with 59 additions and 34 deletions
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93
src/asciidoc/overview.adoc
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@ -714,9 +714,9 @@ into logging calls to the SLF4J API, so if other libraries in your application u
API, then you have a single place to configure and manage logging.
A common choice might be to bridge Spring to SLF4J, and then provide explicit binding
from SLF4J to Log4J. You need to supply 4 dependencies (and exclude the existing
`commons-logging`): the bridge, the SLF4J API, the binding to Log4J, and the Log4J
implementation itself. In Maven you would do that like this
from SLF4J to Log4j. You need to supply several dependencies (and exclude the existing
`commons-logging`): the bridge, the SLF4J implementation for Log4j, and the Log4j
implementation itself. In Maven you would do that like this:
[source,xml,indent=0]
[subs="verbatim,quotes,attributes"]
@ -736,22 +736,22 @@ implementation itself. In Maven you would do that like this
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.5.8</version>
<version>1.7.22</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.5.8</version>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.7</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.5.8</version>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.7</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.7</version>
</dependency>
</dependencies>
----
@ -771,47 +771,72 @@ Spring), because you only want one version of that API on the classpath.
[[overview-logging-log4j]]
===== Using Log4J
===== Using Log4j
NOTE: Log4j 1.x is EOL and the following applies to Log4j 2
Many people use http://logging.apache.org/log4j[Log4j] as a logging framework for
configuration and management purposes. It's efficient and well-established, and in fact
it's what we use at runtime when we build and test Spring. Spring also provides some
utilities for configuring and initializing Log4j, so it has an optional compile-time
dependency on Log4j in some modules.
To make Log4j work with the default JCL dependency ( `commons-logging`) all you need to
do is put Log4j on the classpath, and provide it with a configuration file (
`log4j.properties` or `log4j.xml` in the root of the classpath). So for Maven users this
is your dependency declaration:
To use Log4j with JCL, all you need to do is put Log4j on the classpath and provide
it with a configuration file (`log4j2.xml`, `log4j2.properties`, or other
http://logging.apache.org/log4j/2.x/manual/configuration.html[supported configuration
formats]). For Maven users, the minimal dependencies needed are:
[source,xml,indent=0]
[subs="verbatim,quotes,attributes"]
----
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>{spring-version}</version>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.7</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-jcl</artifactId>
<version>2.7</version>
</dependency>
</dependencies>
----
And here's a sample log4j.properties for logging to the console:
If you also wish to use SLF4J, the following dependencies are also needed:
[literal]
[subs="verbatim,quotes"]
[source,xml,indent=0]
[subs="verbatim,quotes,attributes"]
----
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.7</version>
</dependency>
</dependencies>
----
log4j.rootCategory=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{2}:%L - %m%n
Here is an example `log4j2.xml` for logging to the console:
log4j.category.org.springframework.beans.factory=DEBUG
[source,xml,indent=0]
[subs="verbatim,quotes,attributes"]
----
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>
</Appenders>
<Loggers>
<Logger name="org.springframework.beans.factory" level="DEBUG"/>
<Root level="error">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>
----
[[overview-native-jcl]]
@ -823,11 +848,11 @@ excluding `commons-logging` from your application is not enough in most situatio
To be clear about this: the problems reported are usually not with JCL per se, or even
with `commons-logging`: rather they are to do with binding `commons-logging` to another
framework (often Log4J). This can fail because `commons-logging` changed the way they do
framework (often Log4j). This can fail because `commons-logging` changed the way they do
the runtime discovery in between the older versions (1.0) found in some containers and
the modern versions that most people use now (1.1). Spring does not use any unusual
parts of the JCL API, so nothing breaks there, but as soon as Spring or your application
tries to do any logging you can find that the bindings to Log4J are not working.
tries to do any logging you can find that the bindings to Log4j are not working.
In such cases with WAS the easiest thing to do is to invert the class loader hierarchy
(IBM calls it "parent last") so that the application controls the JCL dependency, not