我有一个maven项目,它使用slf4j和logback作为 Logger . 我可以看到这两个工件都在我的maven依赖项树项目中 . 但每当我尝试运行我的项目时,我都会提示:
SLF4J:无法加载类“org.slf4j.impl.StaticLoggerBinder” . SLF4J:默认为无操作(NOP) Logger 实现SLF4J:有关更多详细信息,请参阅http://www.slf4j.org/codes.html#StaticLoggerBinder .
我检查链接,有人说:
在类路径上放置一个(并且只有一个)slf4j-nop.jar,slf4j-simple.jar,slf4j-log4j12.jar,slf4j-jdk14.jar或logback-classic.jar应该可以解决问题 .
我已经将logback-classic添加到我的项目中(我使用的是1.0.9),但我仍然提示该消息并且我的日志没有运行 .
任何人都可以帮我解决这个问题吗?谢谢 .
更新:
<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>
这是我的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>-->
<!--<!– %l lowers performance –>-->
<!--<!–<pattern>%d [%t] %-5p %l%n %m%n</pattern>–>-->
<!--<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>
我如何在我的程序中使用它:
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);
}
}
这是我的maven依赖项:
2 回答
当你有一个自定义的sbt任务并且任务使用slf4j时,猜测会发生这种情况 . 使用
runner
运行的自定义sbt任务具有通常指定为的classPaths(dependencyClasspath in Compile) value
这导致了错误
logback-classic
通常附加logback-classic
.要解决此错误,您必须在
compile
上将logback-classic
包含在自定义或使用的自定义任务的任何位置 .如果logback-classic或logback-core不在类路径中,则只能具有该特定错误消息 . 因为它们在你的maven依赖项(参见pom)和你的eclipse类路径中(见截图),这很奇怪 .
首先,检查您是否仍然收到相同的错误消息(可能您已修复该问题,现在收到了不同的错误消息) .
第二,在eclipse中,打开类型“StaticLoggerBinder”并在那里放置一个断点 . 还在“LoggerFactory.getLogger”中放置一个断点 . 然后调试 .