带logback的SLF4J还是提示failed to load class "org.slf4j.impl.StaticLoggerBinder"

Question

I have a maven project which use slf4j with logback as the logger. I could see that both artifact are in my maven dependencies tree item. But whenever I tried to run my project, I keep prompted:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

I check the link, and it was said:

Placing one (and only one) of slf4j-nop.jar, slf4j-simple.jar, slf4j-log4j12.jar, slf4j-jdk14.jar or logback-classic.jar on the class path should solve the problem.

I have add the logback-classic to my project (I'm using 1.0.9), but I keep prompted that message and my log doesn't running.

Could anyone help me to solve this problem? Thanks.

UPDATE:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.employee.scheduler</groupId>
<artifactId>rostering</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>nurserostering</name>

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <!-- or whatever version you use -->
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <!-- Needed for runExamples.sh and runExamples.bat -->
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>../../binaries/</classpathPrefix>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <configuration>
                    <executable>java</executable>
                    <classpathScope>runtime</classpathScope>
                    <arguments>
                        <argument>-Xms256m</argument>
                        <argument>-Xmx1024m</argument>
                        <argument>-server</argument>
                        <argument>-cp</argument>
                        <classpath />
                        <argument>com.employee.scheduler.nurserostering.app.NurseRosteringApp</argument>
                    </arguments>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

<dependencies>
    <dependency>
        <groupId>org.optaplanner</groupId>
        <artifactId>optaplanner-core</artifactId>
        <version>6.1.0.Final</version>
    </dependency>
    <dependency>
        <groupId>jdom</groupId>
        <artifactId>jdom</artifactId>
        <version>1.1</version>
    </dependency>
    <dependency>
        <groupId>org.optaplanner</groupId>
        <artifactId>optaplanner-benchmark</artifactId>
        <version>6.1.0.Final</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</artifactId>
        <version>1.0.9</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.0.9</version>
    </dependency>
</dependencies>

and here is my logback.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!--
  ~ Copyright 2013 JBoss Inc
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  -->

<configuration>

  <appender name="consoleAppender" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <!-- %l lowers performance -->
      <!--<pattern>%d [%t] %-5p %l%n  %m%n</pattern>-->
      <pattern>%d [%t] %-5p %m%n</pattern>
    </encoder>
  </appender>
  <!--<appender name="fileAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">-->
    <!--<file>local/log/optaplannerBenchmark.log</file>-->
    <!--<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">-->
      <!--<fileNamePattern>local/log/optaplannerBenchmark.%i.log.zip</fileNamePattern>-->
      <!--<minIndex>1</minIndex>-->
      <!--<maxIndex>3</maxIndex>-->
    <!--</rollingPolicy>-->
    <!--<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">-->
      <!--<maxFileSize>5MB</maxFileSize>-->
    <!--</triggeringPolicy>-->
    <!--<encoder>-->
      <!--&lt;!&ndash; %l lowers performance &ndash;&gt;-->
      <!--&lt;!&ndash;<pattern>%d [%t] %-5p %l%n  %m%n</pattern>&ndash;&gt;-->
      <!--<pattern>%d [%t] %-5p %m%n</pattern>-->
    <!--</encoder>-->
  <!--</appender>-->

  <logger name="org.optaplanner" level="debug"/>
  <logger name="com.employee.scheduler" level="debug"/>

  <root level="warn">
    <appender-ref ref="consoleAppender" />
    <!--<appender-ref ref="fileAppender" />-->
  </root>

</configuration>

How I use it in my program:

public class SolutionBusiness {
    protected final transient Logger logger = LoggerFactory.getLogger(getClass());

// some other codes

public void doMove(Move move) {
        if (solver.isSolving()) {
            logger.error("Not doing user move ({}) because the solver is solving.", move);
            return;
        }
        if (!move.isMoveDoable(guiScoreDirector)) {
            logger.warn("Not doing user move ({}) because it is not doable.", move);
            return;
        }
        logger.info("Doing user move ({}).", move);
        move.doMove(guiScoreDirector);
    }
}

Here is my maven dependencies:

Answer 1

Had the same error. I went to Maven Repository, and looked for the latest non-beta versions. Simply changing the versions worked. A working pom:

<properties>
    <slf4j.version>1.7.26</slf4j.version>
    <logback.version>1.2.3</logback.version>
</properties>

<dependencies>
    <!-- LOGGING -->
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>${logback.version}</version>
    </dependency>

    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</artifactId>
        <version>${logback.version}</version>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
    </dependency>
</dependencies>

Answer 2

Guess this happens when you have a custom sbt task and the task use slf4j. custom sbt task runned with runner has classPaths which commonly specified as

(dependencyClasspath in Compile) value

This caused the error where logback-classic commonly appended on % runtime .

To solve this error, you have to include logback-classic into libraryDependencies on compile at wherever the custom task defined or used.

Answer 3

You can only have that specific error message if logback-classic or logback-core isn't on the classpath. As they are in your maven dependencies (see pom) and in your eclipse classpath (see screenshot), this is weird.

First, check if you're still getting the same error message (maybe you fixed that problem and now got a different error message).

Second, in eclipse, open type "StaticLoggerBinder" and put a breakpoint there. Also put a breakpoint in "LoggerFactory.getLogger". Then debug.

Answer 4

I faced same issue. The problem was the artifact "slf4j-log4j12" not included in the jar file. It should work when you run the application via IDE since dependency is already added to the pom file. It's actually a maven packaging issue. You need to add following plugin to the pom file.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>1.7.1</version>
    <executions>
      <execution>
        <phase>package</phase>
        <goals>
          <goal>shade</goal>
        </goals>
        <configuration>
          <transformers>
            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
              <mainClass>se.cambiosys.connect.publish.ei.client.BulkEiSenderClient</mainClass>
            </transformer>
          </transformers>
          <artifactSet>
            <includes>
              <inlude>org.slf4j:slf4j-log4j12</inlude>
              <inlude>log4j:log4j</inlude>
            </includes>
          </artifactSet>
        </configuration>
      </execution>
    </executions>
  </plugin>

Answer 5

For me the problem was solved when using the correct version of logback-classic .

SLF4J in version 1.7.36 only seems to work with logback-classic in version 1.2.11 .