Correct the classpath of your application so that it contains a single, compatible version of javax.
可以看到servlet-api-2.4.jar是通过jcifs这个jar引入进来的,我们在pom.xml里找到它手动排除就可以了。通过maven的命令行:mvn dependency:tree 来查看Maven依赖信息,落成out.txt文件,搜索。我们应该使用springboot自带tomcat,而不是额外 lib目录下的jar包,所以按提示取目录下删除就可以了。额外 lib/servlet-a
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0.报错
springboot 项目,打包部署到服务器有时启动项目报错
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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:1178)
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:/data01/datax/datax-web-2.1.2/modules/datax-admin/lib/servlet-api-2.4.jar!/javax/servlet/ServletContext.class
jar:file:/data01/datax/datax-web-2.1.2/modules/datax-admin/lib/tomcat-embed-core-9.0.17.jar!/javax/servlet/ServletContext.class
It was loaded from the following location:
file:/data01/datax/datax-web-2.1.2/modules/datax-admin/lib/servlet-api-2.4.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of javax.servlet.ServletContext
javax.servlet.ServletContext 这个类有两个来源
- servlet-api-2.4.jar
- tomcat-embed-core-9.0.17.jar
这两个类都有导致冲突了,目前系统加载的是servlet-api-2.4.jar下的ServletContext.
我们应该使用springboot自带tomcat,而不是额外 lib目录下的jar包,所以按提示取目录下删除就可以了
1.排查与解决
额外 lib/servlet-api-2.4.jar 肯定是pom某个依赖带来的,如何排除?
mvn dependency:tree >out.txt
通过maven的命令行:mvn dependency:tree 来查看Maven依赖信息,落成out.txt文件,搜索 servlet-api
发现
[INFO] ± jcifs:jcifs:jar:1.3.17:compile
[INFO] | - javax.servlet:servlet-api:jar:2.4:compile
可以看到servlet-api-2.4.jar是通过jcifs这个jar引入进来的,我们在pom.xml里找到它手动排除就可以了
pom.xml
<dependency>
<groupId>jcifs</groupId>
<artifactId>jcifs</artifactId>
<version>1.3.17</version>
<exclusions>
<exclusion>
<artifactId>servlet-api</artifactId>
<groupId>javax.servlet</groupId>
</exclusion>
</exclusions>
</dependency>
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