jsp可以正常运行服务器后，添加输出控制台语句会500报异常，什么原因呢？

问题遇到的现象和发生背景

使用jsp入门代码，希望出现标题和控制台输出语句

问题相关代码，请勿粘贴截图

这是hello.jsp



<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <h1>hello jsp</h1>
    <%
        System.out.println("hello jsp");//最关键就是这条，不加这条可以正常出现标题，加了这句网页报500错误
    %>
</body>
</html>

这是pom.xml

<?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>jsp-demo</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>jsp-demo Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </dependency>

    <!--jstl-->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>16</source>
          <target>16</target>
        </configuration>
      </plugin>
    </plugins>
  </build>

</project>
运行结果及报错内容

没有那行sout语句就能正常运行

img


添加sout语句，想在控制台输出，就会报500 什么原因呢？

img

img

控制台报错

img

我想要达到的结果

想要的结果是控制台输出hello jsp

System.out.println("hello jsp");
改成试试
out.print("hello jsp");

看报错是它把 hellow jsp 识别成了 hello.jsp了 你打印 hellow应该就不会了

试试把版本全部改成1.8吧，我试了下这样有效