springboot项目Tomcat启动成功访问URL出现空白页面问题解决
一.问题描述springboot使用自带的Tomcat启动访问URL是空白页面，且没有出现报错信息D:\D1\java\jdk\jdk1.8.0_45\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.j
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一.问题描述
springboot使用自带的Tomcat启动访问URL是空白页面，
且没有出现报错信息
D:\D1\java\jdk\jdk1.8.0_45\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:D:\D1\IDEs\IntelliJ IDEA 2019.3.1\lib\idea_rt.jar=56863:D:\D1\IDEs\IntelliJ IDEA 2019.3.1\bin" -Dfile.encoding=UTF-8 -classpath D:\D1\java\jdk\jdk1.8.0_45\jre\lib\charsets.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\deploy.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\access-bridge-64.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\cldrdata.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\dnsns.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\jaccess.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\jfxrt.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\localedata.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\nashorn.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\sunec.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\sunjce_provider.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\sunmscapi.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\sunpkcs11.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\ext\zipfs.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\javaws.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\jce.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\jfr.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\jfxswt.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\jsse.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\management-agent.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\plugin.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\resources.jar;D:\D1\java\jdk\jdk1.8.0_45\jre\lib\rt.jar;D:\D1\code\MostImportant\framework\springboot\mall\target\classes;D:\D1\java\maven\repo\org\springframework\boot\spring-boot-starter-web\2.2.1.RELEASE\spring-boot-starter-web-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\boot\spring-boot-starter\2.2.1.RELEASE\spring-boot-starter-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\boot\spring-boot\2.2.1.RELEASE\spring-boot-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\boot\spring-boot-autoconfigure\2.2.1.RELEASE\spring-boot-autoconfigure-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\boot\spring-boot-starter-logging\2.2.1.RELEASE\spring-boot-starter-logging-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\D1\java\maven\repo\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\D1\java\maven\repo\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;D:\D1\java\maven\repo\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;D:\D1\java\maven\repo\org\slf4j\jul-to-slf4j\1.7.29\jul-to-slf4j-1.7.29.jar;D:\D1\java\maven\repo\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\D1\java\maven\repo\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;D:\D1\java\maven\repo\org\springframework\boot\spring-boot-starter-json\2.2.1.RELEASE\spring-boot-starter-json-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\com\fasterxml\jackson\core\jackson-databind\2.10.0\jackson-databind-2.10.0.jar;D:\D1\java\maven\repo\com\fasterxml\jackson\core\jackson-annotations\2.10.0\jackson-annotations-2.10.0.jar;D:\D1\java\maven\repo\com\fasterxml\jackson\core\jackson-core\2.10.0\jackson-core-2.10.0.jar;D:\D1\java\maven\repo\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.10.0\jackson-datatype-jdk8-2.10.0.jar;D:\D1\java\maven\repo\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.10.0\jackson-datatype-jsr310-2.10.0.jar;D:\D1\java\maven\repo\com\fasterxml\jackson\module\jackson-module-parameter-names\2.10.0\jackson-module-parameter-names-2.10.0.jar;D:\D1\java\maven\repo\org\springframework\boot\spring-boot-starter-tomcat\2.2.1.RELEASE\spring-boot-starter-tomcat-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\apache\tomcat\embed\tomcat-embed-core\9.0.27\tomcat-embed-core-9.0.27.jar;D:\D1\java\maven\repo\org\apache\tomcat\embed\tomcat-embed-el\9.0.27\tomcat-embed-el-9.0.27.jar;D:\D1\java\maven\repo\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.27\tomcat-embed-websocket-9.0.27.jar;D:\D1\java\maven\repo\org\springframework\boot\spring-boot-starter-validation\2.2.1.RELEASE\spring-boot-starter-validation-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\jakarta\validation\jakarta.validation-api\2.0.1\jakarta.validation-api-2.0.1.jar;D:\D1\java\maven\repo\org\hibernate\validator\hibernate-validator\6.0.18.Final\hibernate-validator-6.0.18.Final.jar;D:\D1\java\maven\repo\org\jboss\logging\jboss-logging\3.4.1.Final\jboss-logging-3.4.1.Final.jar;D:\D1\java\maven\repo\com\fasterxml\classmate\1.5.1\classmate-1.5.1.jar;D:\D1\java\maven\repo\org\springframework\spring-web\5.2.1.RELEASE\spring-web-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\spring-beans\5.2.1.RELEASE\spring-beans-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\spring-webmvc\5.2.1.RELEASE\spring-webmvc-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\spring-aop\5.2.1.RELEASE\spring-aop-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\spring-context\5.2.1.RELEASE\spring-context-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\spring-expression\5.2.1.RELEASE\spring-expression-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\slf4j\slf4j-api\1.7.29\slf4j-api-1.7.29.jar;D:\D1\java\maven\repo\org\springframework\spring-core\5.2.1.RELEASE\spring-core-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\spring-jcl\5.2.1.RELEASE\spring-jcl-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\mybatis\spring\boot\mybatis-spring-boot-starter\1.3.2\mybatis-spring-boot-starter-1.3.2.jar;D:\D1\java\maven\repo\org\springframework\boot\spring-boot-starter-jdbc\2.2.1.RELEASE\spring-boot-starter-jdbc-2.2.1.RELEASE.jar;D:\D1\java\maven\repo\com\zaxxer\HikariCP\3.4.1\HikariCP-3.4.1.jar;D:\D1\java\maven\repo\org\springframework\spring-jdbc\5.2.1.RELEASE\spring-jdbc-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\springframework\spring-tx\5.2.1.RELEASE\spring-tx-5.2.1.RELEASE.jar;D:\D1\java\maven\repo\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\1.3.2\mybatis-spring-boot-autoconfigure-1.3.2.jar;D:\D1\java\maven\repo\org\mybatis\mybatis\3.4.6\mybatis-3.4.6.jar;D:\D1\java\maven\repo\org\mybatis\mybatis-spring\1.3.2\mybatis-spring-1.3.2.jar;D:\D1\java\maven\repo\mysql\mysql-connector-java\8.0.18\mysql-connector-java-8.0.18.jar com.fanyu.mall.MallApplication
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.1.RELEASE)
2021-02-08 10:16:14.506 INFO 2936 --- [ main] com.fanyu.mall.MallApplication : Starting MallApplication on LAPTOP-LMMPH4VI with PID 2936 (D:\D1\code\MostImportant\framework\springboot\mall\target\classes started by darli in D:\D1\code\MostImportant\framework\springboot\mall)
2021-02-08 10:16:14.506 INFO 2936 --- [ main] com.fanyu.mall.MallApplication : No active profile set, falling back to default profiles: default
2021-02-08 10:16:15.874 INFO 2936 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8083 (http)
2021-02-08 10:16:15.874 INFO 2936 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-02-08 10:16:15.874 INFO 2936 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.27]
2021-02-08 10:16:15.874 INFO 2936 --- [ main] o.a.catalina.core.AprLifecycleListener : An older version [1.2.19] of the APR based Apache Tomcat Native library is installed, while Tomcat recommends a minimum version of [1.2.23]
2021-02-08 10:16:15.890 INFO 2936 --- [ main] o.a.catalina.core.AprLifecycleListener : Loaded APR based Apache Tomcat Native library [1.2.19] using APR version [1.6.5].
2021-02-08 10:16:15.890 INFO 2936 --- [ main] o.a.catalina.core.AprLifecycleListener : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2021-02-08 10:16:15.890 INFO 2936 --- [ main] o.a.catalina.core.AprLifecycleListener : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
2021-02-08 10:16:15.890 INFO 2936 --- [ main] o.a.catalina.core.AprLifecycleListener : OpenSSL successfully initialized [OpenSSL 1.1.1a 20 Nov 2018]
2021-02-08 10:16:15.939 INFO 2936 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-02-08 10:16:15.939 INFO 2936 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1385 ms
2021-02-08 10:16:16.256 INFO 2936 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2021-02-08 10:16:16.378 INFO 2936 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8083 (http) with context path ''
2021-02-08 10:16:16.378 INFO 2936 --- [ main] com.fanyu.mall.MallApplication : Started MallApplication in 2.203 seconds (JVM running for 2.944)
2021-02-08 10:16:23.350 INFO 2936 --- [nio-8083-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-02-08 10:16:23.350 INFO 2936 --- [nio-8083-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2021-02-08 10:16:23.352 INFO 2936 --- [nio-8083-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 2 ms
2021-02-08 10:16:23.368 INFO 2936 --- [nio-8083-exec-1] com.zaxxer.hikari.HikariDataSource : com_fanyu_datasource - Starting...
2021-02-08 10:16:23.578 INFO 2936 --- [nio-8083-exec-1] com.zaxxer.hikari.HikariDataSource : com_fanyu_datasource - Start completed.
二.问题解决
尝试了网上很多解决方法，
1）检查application启动类文件位置
2）在启动类上方加入多注解
等等，都没有解决
推测是Tomcat内嵌服务器的问题
故尝试改内置Tomcat为外置Tomcat
1）pom.xml文件中修改打包方式为war
<groupId>com.fanyu</groupId>
<artifactId>mall</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>mall</name>
<description>此为springboot开发商城项目</description>
2）去除内部Tomcat，引入外部Tomcat
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
<!-- 去除内部的的Tomcat依赖-->
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--加入自己的外部的Tomcat依赖-->
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-servlet-api</artifactId>
<version>8.5.37</version>
<!-- <scope>provided</scope>-->
</dependency>
3）idea中引入外置Tomcat
点击edit configurations
修改server信息：
修改deployment信息
注意applicationcontext与URL保持一致
点击apply-》点击OK
4）修改springboot项目启动类
代码如下：
package com.fanyu.mall;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
@SpringBootApplication
@MapperScan(basePackages = "com.fanyu.mall.model.dao")
public class MallApplication extends SpringBootServletInitializer {
public static void main(String[] args) {
SpringApplication.run(MallApplication.class, args);
}
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder){
return builder.sources(MallApplication.class);
}
}
5）运行
Tomcat启动成功，但是输入URL仍出现空白页面；
查看info日志偶然发现
切面类前置拦截获取到参数，后置拦截获取到res为null；
再次排查发现
数据库里没有3对应的记录，所以controller的findUser()方法查询出来的结果为null
修改id为12（数据库存在）
重新
运行成功
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