Spring BootでHello World

前回はSpring BootとGradleでプロジェクトを作成するところまで行った

実はHello World表示させるところでエラーが起きてしまった。

なんとかなったので、今回はブラウザでHello Worldを表示させるとこまで。

Spring BootでHelloWorld

右クリック→新規→クラス

名前にHelloController→完了

下記のようなファイルが作成される。

package com.example;

public class HelloController {

}

これをHelloWorld出るように修正。
@RestControllerと@RequestMappingを使うためのAPIをimportしておく。

package com.example;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    @RequestMapping("/")
    public String index() {
        return "Hello World!";
    }
}

これでローカルホストにアクセスするとHelloWorldが表示される。

http://localhost:8080/

自分は表示されなかったけどな!

Whitelabel Error Page

上記URLにアクセスするとこんなエラーが出た。
なんの情報もない・・・

Whitelabel Error Page

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

Sat May 07 20:18:12 JST 2016
There was an unexpected error (type=Not Found, status=404).
No message available

コンソールには下記が表示されていた。
解読していこう・・・

. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.3.4.RELEASE)

2016-05-07 21:00:06.164 INFO 5671 --- [ main] com.example.DemoWebApplication : Starting DemoWebApplication on runble1Pro.local with PID 5671 (/Users/runble1/Documents/workspace/demoWeb/bin started by runble1 in /Users/runble1/Documents/workspace/demoWeb)
2016-05-07 21:00:06.170 INFO 5671 --- [ main] com.example.DemoWebApplication : No active profile set, falling back to default profiles: default
2016-05-07 21:00:06.358 INFO 5671 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@b7f23d9: startup date [Sat May 07 21:00:06 JST 2016]; root of context hierarchy
2016-05-07 21:00:08.755 INFO 5671 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2016-05-07 21:00:08.776 INFO 5671 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2016-05-07 21:00:08.777 INFO 5671 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.33
2016-05-07 21:00:08.948 INFO 5671 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2016-05-07 21:00:08.948 INFO 5671 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2596 ms
2016-05-07 21:00:09.439 INFO 5671 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2016-05-07 21:00:09.451 INFO 5671 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2016-05-07 21:00:09.452 INFO 5671 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2016-05-07 21:00:09.452 INFO 5671 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2016-05-07 21:00:09.452 INFO 5671 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2016-05-07 21:00:09.805 INFO 5671 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@b7f23d9: startup date [Sat May 07 21:00:06 JST 2016]; root of context hierarchy
2016-05-07 21:00:09.898 INFO 5671 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String com.example.HelloController.index()
2016-05-07 21:00:09.902 INFO 5671 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2016-05-07 21:00:09.902 INFO 5671 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2016-05-07 21:00:09.941 INFO 5671 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-05-07 21:00:09.941 INFO 5671 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-05-07 21:00:10.021 INFO 5671 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-05-07 21:00:10.173 INFO 5671 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2016-05-07 21:00:10.251 ERROR 5671 --- [ main] o.a.coyote.http11.Http11NioProtocol : Failed to start end point associated with ProtocolHandler ["http-nio-8080"]

java.net.BindException: Address already in use
at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_20]
at sun.nio.ch.Net.bind(Net.java:436) ~[na:1.8.0_20]
at sun.nio.ch.Net.bind(Net.java:428) ~[na:1.8.0_20]
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214) ~[na:1.8.0_20]
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_20]
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:340) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:773) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:473) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.catalina.connector.Connector.startInternal(Connector.java:986) [tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) [tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.catalina.core.StandardService.addConnector(StandardService.java:239) [tomcat-embed-core-8.0.33.jar:8.0.33]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.addPreviouslyRemovedConnectors(TomcatEmbeddedServletContainer.java:194) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:151) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:293) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:141) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) [spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at com.example.DemoWebApplication.main(DemoWebApplication.java:10) [bin/:na]

2016-05-07 21:00:10.255 ERROR 5671 --- [ main] o.apache.catalina.core.StandardService : Failed to start connector [Connector[HTTP/1.1-8080]]

org.apache.catalina.LifecycleException: Failed to start component [Connector[HTTP/1.1-8080]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.catalina.core.StandardService.addConnector(StandardService.java:239) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.addPreviouslyRemovedConnectors(TomcatEmbeddedServletContainer.java:194) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:151) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:293) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:141) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) [spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at com.example.DemoWebApplication.main(DemoWebApplication.java:10) [bin/:na]
Caused by: org.apache.catalina.LifecycleException: service.getName(): "Tomcat"; Protocol handler start failed
at org.apache.catalina.connector.Connector.startInternal(Connector.java:993) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
... 13 common frames omitted
Caused by: java.net.BindException: Address already in use
at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_20]
at sun.nio.ch.Net.bind(Net.java:436) ~[na:1.8.0_20]
at sun.nio.ch.Net.bind(Net.java:428) ~[na:1.8.0_20]
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214) ~[na:1.8.0_20]
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) ~[na:1.8.0_20]
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:340) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:773) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:473) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
at org.apache.catalina.connector.Connector.startInternal(Connector.java:986) ~[tomcat-embed-core-8.0.33.jar:8.0.33]
... 14 common frames omitted

2016-05-07 21:00:10.266 INFO 5671 --- [ main] o.apache.catalina.core.StandardService : Stopping service Tomcat
2016-05-07 21:00:10.279 ERROR 5671 --- [ main] o.s.boot.SpringApplication : Application startup failed

org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat servlet container
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:165) ~[spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:293) ~[spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:141) ~[spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) ~[spring-context-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
at com.example.DemoWebApplication.main(DemoWebApplication.java:10) [bin/:na]
Caused by: java.lang.IllegalStateException: Tomcat connector in failed state
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:159) ~[spring-boot-1.3.4.RELEASE.jar:1.3.4.RELEASE]
... 10 common frames omitted

2016-05-07 21:00:10.281 INFO 5671 --- [ main] .b.l.ClasspathLoggingApplicationListener : Application failed to start with classpath: [file:/Users/runble1/Documents/workspace/demoWeb/bin/, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-web/1.3.4.RELEASE/4e6e52428d608daa0119ba348a45754f3c8aa669/spring-boot-starter-web-1.3.4.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-test/1.3.4.RELEASE/c31cbc7e026063baa1be6cf5ed632eec84b09e5b/spring-boot-starter-test-1.3.4.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter/1.3.4.RELEASE/172ecbac4f2031d7769a4b5fdd696827aaf5d894/spring-boot-starter-1.3.4.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-tomcat/1.3.4.RELEASE/3bc6b3ed8534185367970ff4fbf65dc0e12aec79/spring-boot-starter-tomcat-1.3.4.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-validation/1.3.4.RELEASE/ca127670c00a56fd5bfc65da433c01e5c0ed467c/spring-boot-starter-validation-1.3.4.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-databind/2.6.6/5108dde6049374ba980b360e1ecff49847baba4a/jackson-databind-2.6.6.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework/spring-web/4.2.6.RELEASE/d5ce949da3f3266f118ed899a153413613b503ad/spring-web-4.2.6.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework/spring-webmvc/4.2.6.RELEASE/7c7ea475d33287e0e3a92e98ccbe0ad6a0dbb9ca/spring-webmvc-4.2.6.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/junit/junit/4.12/2973d150c0dc1fefe998f834810d68f278ea58ec/junit-4.12.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.mockito/mockito-core/1.10.19/e8546f5bef4e061d8dd73895b4e8f40e3fe6effe/mockito-core-1.10.19.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.hamcrest/hamcrest-core/1.3/42a25dc3219429f0e5d060061f71acb49bf010a0/hamcrest-core-1.3.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.hamcrest/hamcrest-library/1.3/4785a3c21320980282f9f33d0d1264a69040538f/hamcrest-library-1.3.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework/spring-core/4.2.6.RELEASE/a1c6ef01f18888f51fc5054c65ef4787b7cf0a1e/spring-core-4.2.6.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework/spring-test/4.2.6.RELEASE/1f869333b3d64f17009a613368165978af575d8c/spring-test-4.2.6.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot/1.3.4.RELEASE/a89b67bc53e0c7608ba4ad2fe59be768dd9eb3f9/spring-boot-1.3.4.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-autoconfigure/1.3.4.RELEASE/3ec620ecf0844c5f441c6de729607f4953bba9f5/spring-boot-autoconfigure-1.3.4.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-logging/1.3.4.RELEASE/18f9f5f00cc794339860ca2a082a70e99ef3797a/spring-boot-starter-logging-1.3.4.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.yaml/snakeyaml/1.16/d64fb662c9e42789149f5078a62a22edda786c6a/snakeyaml-1.16.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.apache.tomcat.embed/tomcat-embed-core/8.0.33/4e7f547fbb2c364cb5e02a58790c5fb89e31efed/tomcat-embed-core-8.0.33.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.apache.tomcat.embed/tomcat-embed-el/8.0.33/31423f2d493cf1f7cf5f0082c9f94640e93b8c1b/tomcat-embed-el-8.0.33.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.apache.tomcat.embed/tomcat-embed-logging-juli/8.0.33/66bc309e0227c1ba2cf4417182d0b1583003d24b/tomcat-embed-logging-juli-8.0.33.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.apache.tomcat.embed/tomcat-embed-websocket/8.0.33/be1f95e5d9ae00f9bc6138441d29cfe5c7c60256/tomcat-embed-websocket-8.0.33.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.hibernate/hibernate-validator/5.2.4.Final/fb18766b576aa6632bcfe9a20a023cbd52bf9769/hibernate-validator-5.2.4.Final.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-annotations/2.6.6/7ef6440e71531604aa44a5eb62d4b466ffbf7e8f/jackson-annotations-2.6.6.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-core/2.6.6/2eb801df67aacaf5b1deb4ac626e1964508e47b/jackson-core-2.6.6.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework/spring-aop/4.2.6.RELEASE/5efbfccb19efda2956b8977561bf4da6b15b0d0e/spring-aop-4.2.6.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework/spring-beans/4.2.6.RELEASE/d4a319fb4d949fb6313f45c929947b9b4e26283e/spring-beans-4.2.6.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework/spring-context/4.2.6.RELEASE/bbf3c8526fe37bb341507f28db17882d4348dbca/spring-context-4.2.6.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.springframework/spring-expression/4.2.6.RELEASE/c0182d73f348ab11d51d45cbe29f3820c32d0ccc/spring-expression-4.2.6.RELEASE.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.objenesis/objenesis/2.1/87c0ea803b69252868d09308b4618f766f135a96/objenesis-2.1.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/ch.qos.logback/logback-classic/1.1.7/9865cf6994f9ff13fce0bf93f2054ef6c65bb462/logback-classic-1.1.7.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.slf4j/jcl-over-slf4j/1.7.21/331b564a3a42f002a0004b039c1c430da89062cd/jcl-over-slf4j-1.7.21.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.slf4j/jul-to-slf4j/1.7.21/2f22c882ffa479d1e9ff4eb0e8e2c29f2a0871ed/jul-to-slf4j-1.7.21.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.slf4j/log4j-over-slf4j/1.7.21/b3700d97464d99bdcd42c0177d6e7951c94d75ff/log4j-over-slf4j-1.7.21.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/javax.validation/validation-api/1.1.0.Final/8613ae82954779d518631e05daa73a6a954817d5/validation-api-1.1.0.Final.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.jboss.logging/jboss-logging/3.3.0.Final/3616bb87707910296e2c195dc016287080bba5af/jboss-logging-3.3.0.Final.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/com.fasterxml/classmate/1.1.0/dbbd699a1486ad0f2ed6f5af6cfed66acacb9056/classmate-1.1.0.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/aopalliance/aopalliance/1.0/235ba8b489512805ac13a8f9ea77a1ca5ebe3e8/aopalliance-1.0.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/ch.qos.logback/logback-core/1.1.7/7873092d39ef741575ca91378a6a21c388363ac8/logback-core-1.1.7.jar, file:/Users/runble1/.gradle/caches/modules-2/files-2.1/org.slf4j/slf4j-api/1.7.21/139535a69a4239db087de9bab0bee568bf8e0b70/slf4j-api-1.7.21.jar]

どうやら8080ポートが既に使われているようだ。
Spring Booにはサーバが組み込まれていて、それと競合しているのか?

原因を特定する前に、緊急回避策としてポート番号を変更してみる。

/demoWeb/src/main/resources/application.properties

上記ファイルに追記。

server.port=9000

ポート番号を9000に指定してアクセスする。

http://localhost:9000/

今度はHello Worldが表示された!

つまり、何かで8080ポートが既に使われていたことが原因だった。
原因究明はまた今度・・・

補足: EclipseのTomcatについて

Eclipseにはサーバプログラム(tc Sever)が同封されている。
このサーバを利用することで、作成したプロジェクトをローカル環境で動作させることができる
そのために以下の作業が必要
・プロジェクトをサーバに追加する
・サーバを起動する

参考

Spring Boot をはじめてみるよ(Gradle 編)

春だから!Javaでの開発にSpring Bootを使おう!

Launching Spring application Address already in use

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