<p>今天搭建项目的时候启动报错，java.lang.NoClassDefFoundError: ch/qos/logback/classic/turbo/TurboFilter</p>

具体错误如下：

2018-09-15 16:06:14,588 main ERROR appender Console has no parameter that matches element PatternLayout
Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/classic/turbo/TurboFilter
	at java.lang.Class.getDeclaredConstructors0(Native Method)
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
	at java.lang.Class.getConstructor0(Class.java:3075)
	at java.lang.Class.getConstructor(Class.java:1825)
	at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:169)
	at org.springframework.boot.logging.LoggingSystem.get(LoggingSystem.java:160)
	at org.springframework.boot.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:229)
	at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:209)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122)
	at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:69)
	at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:48)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:292)
	at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:134)
	at cn.xlink.App.main(App.java:26)
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.classic.turbo.TurboFilter
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 17 more

百度到的大部分是缺少包，比如解决办法引入 jar 包，但是我启动还是报错，那我就继续百度。

<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.2.3</version>
</dependency>

其中这篇文章给我了启发：https://blog.csdn.net/qq_35981283/article/details/73161921

我是里面的包冲突，当然按照里面的办法我也能解决，但是略有不同。

看我的 pom 文件

   1、这是最开始的配置，启动不不错，但是无现在不用mongodb了，我就删掉了A但是启动就报错
   A     <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

    B    <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

后来改成如下这样就不报错了。

       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
             <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
所以是包冲突的问题，改了就好了