javax.servlet.ServletException: Servlet执行抛出一个异常怎么解决？

javax.servlet.ServletException: Servlet执行抛出一个异常怎么解决？

站长亲测

1. 数据库版本过高会导致报错 HTTP状态 500 – 内部服务器错误

2. 如果未在webapp导入lib库会导致500报错

HTTP状态 500 - 内部服务器错误

类型 异常报告

消息 Servlet执行抛出一个异常

描述 服务器遇到一个意外的情况，阻止它完成请求。

例外情况

javax.servlet.ServletException: Servlet执行抛出一个异常
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

根本原因。

java.lang.NoClassDefFoundError: org/apache/ibatis/io/Resources
	Request.LoginServlet.doGet(LoginServlet.java:29)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:488)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:582)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

根本原因。

java.lang.ClassNotFoundException: org.apache.ibatis.io.Resources
	org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1420)
	org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1228)
	Request.LoginServlet.doGet(LoginServlet.java:29)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:488)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:582)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

):注意 主要问题的全部 stack 信息可以在 server logs 里查看
Apache Tomcat/8.5.87

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.5</version>
    </dependency>

    <!--mysql 驱动-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.46</version>
    </dependency>

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>Maven-Mybatis-Servlet-Spring-0408</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <properties>
        <maven.compiler.source>20</maven.compiler.source>
        <maven.compiler.target>20</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <!--导入Servlet依赖坐标-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <!--
              此处为什么需要添加该标签?
              provided指的是在编译和测试过程中有效,最后生成的war包时不会加入
               因为Tomcat的lib目录中已经有servlet-api这个jar包，如果在生成war包的时候生效就会和Tomcat中的jar包冲突，导致报错
            -->
            <scope>provided</scope>
        </dependency>
        <!-- mysql坐标 -->
<!--        <dependency>-->
<!--            <groupId>mysql</groupId>-->
<!--            <artifactId>mysql-connector-java</artifactId>-->
<!--            <version>5.1.32</version>-->
<!--        </dependency>-->
        <!--mybatis 依赖-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>

        <!--mysql 驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>

        <!--junit 单元测试-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>

        <!-- 添加slf4j日志api -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.20</version>
        </dependency>
        <!-- 添加logback-classic依赖 -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>
        <!-- 添加logback-core依赖 -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-websocket</artifactId>
            <version>10.1.7</version>
        </dependency>
        <dependency>
            <groupId>org.webjars.npm</groupId>
            <artifactId>gulp-insert</artifactId>
            <version>0.5.0</version>
        </dependency>
    </dependencies>

</project>