tomcat热启动没问题, 访问项目报500解决办法

新建maven项目

添加热启动

启动访问项目报错

报错提示

解决办法

思路:包冲突

在pom.xml中添加servlet

<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>javax.servlet-api</artifactId>
	<version>3.0.1</version>
	<scope>provided</scope>
</dependency>

注释

		<!-- <dependency>
			<groupId>javax</groupId>
			<artifactId>javaee-api</artifactId>
			<version>7.0</version>
			<scope>provided</scope>
		</dependency> -->
        <!-- 	 <dependency>
			<groupId>org.glassfish.web</groupId>
			<artifactId>javax.servlet.jsp.jstl</artifactId>
			<version>1.2.2</version>
		</dependency> -->

完整的pom.xml

<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>11</groupId>
	<artifactId>11</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<name>11</name>
	<description />
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.0.1</version>
			<scope>provided</scope>
		</dependency>
		<!-- <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId>
			<version>7.0</version> <scope>provided</scope> </dependency> -->
		<!-- <dependency> <groupId>org.glassfish.web</groupId> <artifactId>javax.servlet.jsp.jstl</artifactId>
			<version>1.2.2</version> </dependency> -->
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>2.3.2</version>
				<configuration>
					<source>1.7</source>
					<target>1.7</target>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-war-plugin</artifactId>
				<version>2.2</version>
				<configuration>
					<version>3.1</version>
					<failOnMissingWebXml>false</failOnMissingWebXml>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<configuration>
					<port>9921</port>
					<path>/</path>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>