JSP项目报错在build path里找不到javax.servlet.http.HttpServlet的解决方法

我新建了一个JSP项目，遇到一个编译错误：The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path

解决方法

新建Server Runtime Environment：

Runtime Environments选择Apache Tomcat：

右键单击JSP项目，Build Path->Configure Build Path:

Add Library->Server Runtime:

添加完毕后，Eclipse里的编译错误消失了：

查看JSP项目文件夹下的.classpath文件，格式为xml，我们之前维护的Apache Server runtime已经写入在里面了：

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
	<classpathentry kind="src" path="src"/>
	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
		<attributes>
			<attribute name="module" value="true"/>
			<attribute name="owner.project.facets" value="java"/>
		</attributes>
	</classpathentry>
	<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>
	<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
	<classpathentry kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v9.0"/>
	<classpathentry kind="output" path="build/classes"/>
</classpath>

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