关于java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log

配置JFinal环境时，jar包已导入，web.xml已配置，Config也已经配置好，测试服务器时不停地出现

Exception in thread "main" java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V
    at org.eclipse.jetty.util.log.JettyAwareLogger.log(JettyAwareLogger.java:607)
    at org.eclipse.jetty.util.log.JettyAwareLogger.warn(JettyAwareLogger.java:431)
    at org.eclipse.jetty.util.log.Slf4jLog.warn(Slf4jLog.java:69)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.setFailed(AbstractLifeCycle.java:204)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:74)
    at com.jfinal.server.JettyServer.doStart(JettyServer.java:121)
    at com.jfinal.server.JettyServer.start(JettyServer.java:64)
    at com.jfinal.core.JFinal.start(JFinal.java:137)
    at com.demo.common.CommonConfig.main(CommonConfig.java:43)

　　百度后得知两种结果：（1）缺少slf4j的jar包。（2）jar包冲突

这里只有log4j一个jar包。
在pom.xml里查看了一遍版本信息

<dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.8.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.jfinal</groupId>
            <artifactId>jetty-server</artifactId>
            <version>8.1.8</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <!-- jsp support by jetty -->
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-jsp</artifactId>
            <version>8.1.8.v20121106</version>
            <scope>provided</scope>
        </dependency>
        <!-- cos -->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>net.sf.ehcache</groupId>
            <artifactId>ehcache-core</artifactId>
            <version>2.6.6</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.20</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity</artifactId>
            <version>1.7</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-tools</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.jfinal</groupId>
            <artifactId>cos</artifactId>
            <version>26Dec2008</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib-nodep</artifactId>
            <version>3.1</version>
        </dependency>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.7.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>de.ruedigermoeller</groupId>
            <artifactId>fst</artifactId>
            <version>2.29</version>
            <scope>provided</scope>
        </dependency>

        <!--
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.20</version>
        </dependency>

　　全部一致
最后在JFinal官网里下载了一个完整的项目 jfinal_deme 2.0，通过比对发现了不同的地方 

然后将java ee移除后测试成功！