1，SpringBoot專案啟動報錯

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APPLICATION FAILED TO START
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Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    org.apache.catalina.authenticator.AuthenticatorBase.startInternal(AuthenticatorBase.java:
 
1355)

The following method did not exist:

    javax.servlet.ServletContext.getVirtualServerName()Ljava/lang/String;

The method's class, javax.servlet.ServletContext, is available from the following locations:

    jar:file:/D:/development_tools/maven/apache-maven-3.6.3/repo/javax/servlet/servlet-api/2.5/servlet-api-2.5
 
.jar!/javax/servlet/ServletContext.class
    jar:file:/D:/development_tools/maven/apache-maven-3.6.3/repo/org/apache/tomcat/embed/tomcat-embed-core/9.0.41/tomcat-embed-core-9.0.41.jar!/javax/servlet/ServletContext.class

The class hierarchy was loaded from the following locations:

    javax.servlet.ServletContext: file:
 
/D:/development_tools/maven/apache-maven-3.6.3/repo/javax/servlet/servlet-api/2.5/servlet-api-2.5.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of javax.servlet.ServletContext


Process finished with exit code 1

2，錯誤原因 ： jar 包衝突

jar:file:/D:/development_tools/maven/apache-maven-3.6.3/repo/javax/servlet/servlet-api/2.5/servlet-api-2.5.jar!/javax/servlet/ServletContext.class
    jar:file:/D:/development_tools/maven/apache-maven-3.6.3/repo/org/apache/tomcat/embed/tomcat-embed-core/9.0.41/tomcat-embed-core-9.0.41.jar!/javax/servlet/ServletContext.class

去掉就好了