idea spring boot java maven 依赖重复报错解决

依赖重复报错

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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:/E:/Tool/maven/maven-repository/javax/servlet/servlet-api/2.3/servlet-api-2.3.jar!/javax/servlet/ServletContext.class
jar:file:/E:/Tool/maven/maven-repository/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:/E:/Tool/maven/maven-repository/javax/servlet/servlet-api/2.3/servlet-api-2.3.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

分析：
编译时无报错，运行时报错。

从上面看是由于多个依赖 同时包含 ServletContext.class 所致。

包含该类的jar文件分别是 servlet-api-2.3.jar 和 tomcat-embed-core-9.0.29.jar

我们需要这里要排除 servlet-api-2.3.jar

解决：

1、打开项目依赖关系图
2、查找依赖

3、追溯项目依赖，直接点进去就可以

查找是哪些依赖引入了servlet-api-2.3.jar，通过点击箭头，往上追溯，一直到我们自己的依赖

4、排除依赖

<dependency>
    <groupId>com.octo.captchagroupId>
    <artifactId>jcaptchaartifactId>
    <version>1.0version>
    <exclusions>	//排除
        <exclusion>
            <groupId>javax.servletgroupId>
            <artifactId>servlet-apiartifactId>
        exclusion>
    exclusions>
dependency>
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5、再次编译后启动