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Question

我用这个原型创建了Servlet：http://maciejwalkowiak.github.io/servlet3-maven-archetype/

mvn archetype:generate \
  -DarchetypeGroupId=pl.maciejwalkowiak \
  -DarchetypeArtifactId=servlet3-webapp-archetype \
  -DarchetypeVersion=1.0.1

然后我将index.jsp添加到src / main / webapp目录

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>hello, world</h1>
</body>
</html>

当我运行mvn tomcat7:run并打开http://127.0.0.1/mycontext/index.jsp

时

发生此错误：

HTTP Status 500 - Unable to compile class for JSP:

type Exception report

message Unable to compile class for JSP:

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 1 in the generated java file
The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files

Stacktrace:
    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:331)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:469)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

问题是什么？

更新

我正在使用java8，但我在maven中有以下maven-compiler配置：

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
            </configuration>
        </plugin>

Answer 1

您应该仔细检查您的Tomcat版本。 Tomcat 7.0.32包含一个与Java 8不完全兼容的jar，因此升级Tomcat版本可能会有所帮助。看看this。

Answer 2

您使用的是哪种JDK？如果是8，您还必须将Tomcat更新为8。如果情况并非如此，您应该尝试进入“项目”菜单并从那里选择“清理...”。然后尝试通过从右键单击菜单中选择这些选项来清理Server和Server Working文件夹。

Tomcat无法在Servlet 3.0中编译JSP类

更新

2 个答案: