SLF4j未写入日志文件

Question

In my web project I am trying to use SLF4j with logback , I have pasted the SLF4j xml settings and also the section of POM ,when I start the application on Tomacat in local machine. I do not see any errors nor the logs are generated.

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <layout class="ch.qos.logback.classic.PatternLayout">
      <Pattern>%d{yyyyddMM:HHmmss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
    </layout>
  </appender>
  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>./myapp.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <!-- daily rollover -->
      <fileNamePattern>./myapp.%d{yyyy-MM-dd}.log</fileNamePattern>
      <!-- keep 30 days' worth of history -->
      <maxHistory>14</maxHistory>
    </rollingPolicy>
    <encoder>
      <pattern>%d{yyyyddMM:HHmmss.SSS} [%thread] %-5level %logger{35} - %msg%n</pattern>
    </encoder>
  </appender>
  <appender name="DEBUG" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>./myapp_debug.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <!-- daily rollover -->
      <fileNamePattern>./myapp_debug.%d{yyyy-MM-dd}.log</fileNamePattern>
      <!-- keep 30 days' worth of history -->
      <maxHistory>1</maxHistory>
    </rollingPolicy>
    <encoder>
      <pattern>%d{yyyyddMM:HHmmss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
    </encoder>
  </appender>
  <!-- logger name="com.base22" level="TRACE"/ -->
  <logger name="com.sample.app" level="TRACE" />
  <logger name="org.apache" level="ERROR" />
  <logger name="org.springframework" level="ERROR" />
  <logger name="org.hibernate" level="ERROR" />
  <logger name="java.sql" level="ERROR" />
  <logger name="jdbc.audit" level="ERROR" />
  <logger name="jdbc.connection" level="ERROR" />
  <logger name="jdbc.sqltiming" level="ERROR" />
  <logger name="jdbc.resultset" level="ERROR" />
  <logger name="jdbc.resultsettable" level="ERROR" />

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

Section of Maven Pom for Logging jars

<!-- Logging -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>1.7.12</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>log4j-over-slf4j</artifactId>
            <version>1.7.12</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.12</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.1.3</version>
        </dependency>

Answer 1

There is an interesting way to deal with this.

First, verify that you have no conflicting bindings (ie log4j getting pulled in). Since you are using maven, run the following command:

mvn dependency:tree -Dverbose -Dincludes=:log4j,:commons-logging

If you see any of those dependencies included transitively, add exclusions to the dependencies that are bringing those in.

Secondly, add jul-to-slf4j to your dependency list (corresponding to the version you are using). You should put any and all bindings outside of slf4j-api as runtime scope.

Thirdly, add the file src/main/resources/logging.properties with the contents

handlers = org.slf4j.bridge.SLF4JBridgeHandler

If you are launching tomcat through the standard startup or catalina scripts it will automatically configure a "log manager" that will allow you to override a context specific java.util.logging (jul) configuration.

See here for more information.

Answer 2

Hi I fixed the problem made couple of changes ,

POM.XML

<dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>1.7.12</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.1.3</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.1.3</version>
        </dependency>

In logback.xml

changed ./myapp.log to ${catalina.home}/logs/myapp.log

and I can see the logs generated now in Tomcat/Logs directory

Answer 3

可能是您搜索的日志文件位置可能不正确，请使用名称搜索日志文件。