spring boot 启动报 java.lang.NoClassDefFoundError: ch/qos/logback/core/spi/LifeCycle 错误

Failed to instantiate SLF4J LoggerFactory
Reported exception:
java.lang.NoClassDefFoundError: ch/qos/logback/core/spi/LifeCycle
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:)
    at java.net.URLClassLoader.access$(URLClassLoader.java:)
    at java.net.URLClassLoader$.run(URLClassLoader.java:)
    at java.net.URLClassLoader$.run(URLClassLoader.java:)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:)
    at org.slf4j.impl.StaticLoggerBinder.<init>(StaticLoggerBinder.java:)
    at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:)
    at org.slf4j.LoggerFactory.bind(LoggerFactory.java:)
    at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:)
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:)
    at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:)
    at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:)
    at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:)
    at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:)
    at com.cfj.testboot.Application.main(Application.java:)

解决：这个问题的根本原因是类路径中不存在所需的jar。请添加以下依赖项——它们将解决您的问题。

再pom.xml中增加：

<dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>

                </exclusion>
            </exclusions>
        </dependency>

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