springboot配置支持jsp依赖报错，但是不影响项目运行。

想Spring boot 支持jsp，在pom.xml文件中加入了依赖如下：

        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope> 
        </dependency> 

        <!-- jstl标签 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

结果启动项目报错，但是最后还是成功启动了，所有功能都能实现且无异常。但是报错让人很不舒服。。。
在Maven Dependencies中，有提及的mchange-commons-java-0.2.11.jar包。


  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.5.RELEASE)

2019-05-18 22:36:53.484  INFO 10320 --- [           main] com.theo.alpha.AlphaApplication          : Starting AlphaApplication on theo with PID 10320 (E:\springboot\alpha\target\classes started by Theo in E:\springboot\alpha)
2019-05-18 22:36:53.493  INFO 10320 --- [           main] com.theo.alpha.AlphaApplication          : No active profile set, falling back to default profiles: default
2019-05-18 22:36:58.575  INFO 10320 --- [g-Init-Reporter] com.mchange.v2.log.MLog                  : MLog clients using slf4j logging.
2019-05-18 22:36:58.673  INFO 10320 --- [           main] com.mchange.v2.c3p0.C3P0Registry         : Initializing c3p0-0.9.5.2 [built 08-December-2015 22:06:04 -0800; debug? true; trace: 10]
2019-05-18 22:37:00.287  INFO 10320 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8081 (http)
2019-05-18 22:37:00.408  INFO 10320 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-05-18 22:37:00.412  INFO 10320 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.19]
2019-05-18 22:37:01.735  WARN 10320 --- [           main] o.a.tomcat.util.scan.StandardJarScanner  : Failed to scan [file:/C:/Users/Theo/.m2/repository/com/mchange/c3p0/0.9.5.2/mchange-commons-java-0.2.11.jar] from classloader hierarchy

java.io.FileNotFoundException: C:\Users\Theo\.m2\repository\com\mchange\c3p0\0.9.5.2\mchange-commons-java-0.2.11.jar (系统找不到指定的文件。)
    at java.util.zip.ZipFile.open(Native Method) ~[na:1.8.0_152]
    at java.util.zip.ZipFile.<init>(ZipFile.java:225) ~[na:1.8.0_152]
    at java.util.zip.ZipFile.<init>(ZipFile.java:155) ~[na:1.8.0_152]
    at java.util.jar.JarFile.<init>(JarFile.java:166) ~[na:1.8.0_152]
    at java.util.jar.JarFile.<init>(JarFile.java:130) ~[na:1.8.0_152]
    at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:164) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.tomcat.util.scan.JarFileUrlJar.<init>(JarFileUrlJar.java:65) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:374) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:309) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:266) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:229) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262) [tomcat-embed-jasper-9.0.19.jar:9.0.19]
    at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104) [tomcat-embed-jasper-9.0.19.jar:9.0.19]
    at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83) [tomcat-embed-jasper-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5139) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_152]
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_152]
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:831) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_152]
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_152]
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:423) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.apache.catalina.startup.Tomcat.start(Tomcat.java:455) [tomcat-embed-core-9.0.19.jar:9.0.19]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:106) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:427) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:180) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) [spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]
    at com.theo.alpha.AlphaApplication.main(AlphaApplication.java:10) [classes/:na]

2019-05-18 22:37:01.782  INFO 10320 --- [           main] org.apache.jasper.servlet.TldScanner     : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2019-05-18 22:37:01.809  INFO 10320 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/alpha]  : Initializing Spring embedded WebApplicationContext
2019-05-18 22:37:01.809  INFO 10320 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 8078 ms
2019-05-18 22:37:04.034  INFO 10320 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-05-18 22:37:05.326  INFO 10320 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8081 (http) with context path '/alpha'
2019-05-18 22:37:05.346  INFO 10320 --- [           main] com.theo.alpha.AlphaApplication          : Started AlphaApplication in 13.509 seconds (JVM running for 15.915)

删除依赖后不报错，但是直接访问jsp页面会变成下载，通过Controller跳转到jsp页面会报错

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat May 18 23:03:06 CST 2019
There was an unexpected error (type=Not Found, status=404).
No message available

以下是项目的POM.xml文件

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.theo</groupId>
    <artifactId>alpha</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>alpha</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>




<!-- jsp支持 -->
<!--        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope> 
        </dependency>  -->

<!-- jstl标签库 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>



<!-- 上传下载用 -->
       <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>

        <!-- 自定义标签 -->
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version> 
        </dependency>



    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

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毕小宝博客专家认证 2019-05-19 09:50
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第一个 jar 包依赖找不到的问题，需要更新的 maven 项目重新解决依赖。
其次，第二个 404 说明你访问的页面路径可能有问题，先在 controller 类中打断点看看能否进入 Controller ，然后再看 Controller 的跳转页面的路径是否正确。

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springboot配置支持jsp依赖报错，但是不影响项目运行。

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