Maven – Logging with slf4j, and ‘logback’, but not creating specified log file which is in configuration. (using maven, jetty)

jettylogbackmavenslf4j

As specified in title I'm using Maven, and Jetty. For logging using SLF4J and Logback. I have 'logback.xml' at 'src/main/resources'.

    <configuration>
        <appender name="STDOUT"
                class="ch.qos.logback.core.ConsoleAppender">
            <layout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%-4relative [%thread] %-5level %class - %msg%n</pattern>
            </layout>
        </appender>

        <appender name="FILE"
            class="ch.qos.logback.core.FileAppender">
            <layout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%-4relative [%thread] %-5level %class - %msg%n</pattern>
            </layout>
            <File>myLog.log</File>
        </appender>

        <logger name="org.mortbay">
            <level value="debug" />
        </logger>

        <root>
            <level value="error" />
            <appender-ref ref="STDOUT" />
            <appender-ref ref="FILE" />
        </root>
</configuration>

But my problem is its not creating the file 'myLog.log' if I run/debug the project. What's the solution to get the log file.

Is there any way to get the log file only with SLF4J?

Best Answer

Sorry! I misunderstood the usage of 'Logback'. I got solution from http://www.mail-archive.com/user@slf4j.org/msg00661.html

i.e.

It appears that you have misunderstood the purpose of SLF4J. If you place slf4j-jdk14-1.5.6.jar then slf4j-api will bind with java.util.logging. Logback will not be used. Only if you place logback-core.jar and logback-classic.jar on your class path (but not slf4j-jdk14-1.5.6.jar) will SLF4J API bind with logback. SLF4J binds with one and only one underlying logging API (per JVM launch).

HTH,

Thanks to Ceki Gulcu. Now I can able to get logs in my file.

Related Solutions

Java – Logback to log different messages to two files

It's very possible to do something like this in logback. Here's an example configuration:

<?xml version="1.0"?>
<configuration>
    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
        <file>logfile.log</file>
        <append>true</append>
        <encoder>
            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg %n</pattern>
        </encoder>
    </appender>
    <appender name="ANALYTICS-FILE" class="ch.qos.logback.core.FileAppender">
        <file>analytics.log</file>
        <append>true</append>
        <encoder>
            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg %n</pattern>
        </encoder>
    </appender>
    <!-- additivity=false ensures analytics data only goes to the analytics log -->
    <logger name="analytics" level="DEBUG" additivity="false">
        <appender-ref ref="ANALYTICS-FILE"/>
    </logger>
    <root>
        <appender-ref ref="FILE"/>
    </root>
</configuration>

Then you'd setup two separate loggers, one for everything and one to log analytics data like so:

Logger analytics = LoggerFactory.getLogger("analytics");

Maven – logback logging with maven-jetty-plugin

It works with Jetty 9 and the jetty-maven-plugin:

<plugin>
  <groupId>org.eclipse.jetty</groupId>
  <artifactId>jetty-maven-plugin</artifactId>
  <version>${jetty.version}</version>
  <dependencies>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>${logback.version}</version>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-access</artifactId>
      <version>${logback.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
  </dependencies>
  <configuration>
    <scanIntervalSeconds>10</scanIntervalSeconds>
    <webAppSourceDirectory>src/main/resources/htdocs</webAppSourceDirectory>
    <webApp>
      <descriptor>src/main/webapp/WEB-INF/web.xml</descriptor>
    </webApp>
    <systemProperties>
      <systemProperty>
        <name>org.eclipse.jetty.util.log.Log</name>
        <value>org.eclipse.jetty.util.log.Slf4jLog</value>
      </systemProperty>
      <systemProperty>
        <name>logback.configurationFile</name>
        <value>src/main/resources/logback.xml</value>
      </systemProperty>
    </systemProperties>
  </configuration>
</plugin>

Best Answer

Related Solutions

Java – Logback to log different messages to two files

Maven – logback logging with maven-jetty-plugin

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