embedded tomcat not starting in Spring boot even after port change - spring

Question

Embedded Tomcat is not starting in spring boot application. I have tried reading all the solutions related to changing port number. i tried all those still it is giving me same error. I have even tried giving port number as 0 still no help. I have added liquibase dependency as well for that i have created a dummy log file. But i guess thats not causing the problem. I tried other Spring boot projects too still facing same issue.
<?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>com.springboot.ashish</groupId>
<artifactId>springbootdemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springbootdemo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Edgware.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-actuator-docs</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-social-facebook</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Stack Trace :
2018-01-23 11:34:29.820 INFO 10432 --- [ main] o.s.c.support.DefaultLifecycleProcessor : Starting beans in phase 0
2018-01-23 11:34:29.961 DEBUG 10432 --- [ main] o.s.w.s.resource.ResourceUrlProvider : Looking for resource handler mappings
2018-01-23 11:34:29.961 DEBUG 10432 --- [ main] o.s.w.s.resource.ResourceUrlProvider : Found resource handler mapping: URL pattern="/**/favicon.ico", locations=[ServletContext resource [/], class path resource [META-INF/resources/], class path resource [resources/], class path resource [static/], class path resource [public/], class path resource []], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver#37e64e37]
2018-01-23 11:34:29.961 DEBUG 10432 --- [ main] o.s.w.s.resource.ResourceUrlProvider : Found resource handler mapping: URL pattern="/webjars/**", locations=[class path resource [META-INF/resources/webjars/]], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver#31204303]
2018-01-23 11:34:29.961 DEBUG 10432 --- [ main] o.s.w.s.resource.ResourceUrlProvider : Found resource handler mapping: URL pattern="/**", locations=[ServletContext resource [/], class path resource [META-INF/resources/], class path resource [resources/], class path resource [static/], class path resource [public/]], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver#369fb99a]
2018-01-23 11:34:29.961 DEBUG 10432 --- [ main] o.s.w.s.resource.ResourceUrlProvider : Found resource handler mapping: URL pattern="/docs/**", locations=[class path resource [META-INF/resources/spring-boot-actuator/docs/]], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver#81a8898]
2018-01-23 11:34:51.050 ERROR 10432 --- [ main] o.a.coyote.http11.Http11NioProtocol : Failed to start end point associated with ProtocolHandler ["http-nio-8056"]
java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source) ~[na:1.8.0_121]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_121]
at sun.nio.ch.PipeImpl.<init>(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source) ~[na:1.8.0_121]
at java.nio.channels.Pipe.open(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source) ~[na:1.8.0_121]
at java.nio.channels.Selector.open(Unknown Source) ~[na:1.8.0_121]
at org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector(NioSelectorPool.java:66) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.tomcat.util.net.NioSelectorPool.open(NioSelectorPool.java:130) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:227) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:990) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:635) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1022) [tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.catalina.core.StandardService.addConnector(StandardService.java:225) [tomcat-embed-core-8.5.23.jar:8.5.23]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.addPreviouslyRemovedConnectors(TomcatEmbeddedServletContainer.java:250) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:193) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:297) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:145) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at com.springboot.ashish.springbootdemo.SpringbootdemoApplication.main(SpringbootdemoApplication.java:23) [classes/:na]
Caused by: java.net.ConnectException: Connection timed out: connect
at sun.nio.ch.Net.connect0(Native Method) ~[na:1.8.0_121]
at sun.nio.ch.Net.connect(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.Net.connect(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.SocketChannelImpl.connect(Unknown Source) ~[na:1.8.0_121]
at java.nio.channels.SocketChannel.open(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(Unknown Source) ~[na:1.8.0_121]
... 29 common frames omitted
2018-01-23 11:34:51.052 ERROR 10432 --- [ main] o.apache.catalina.core.StandardService : Failed to start connector [Connector[HTTP/1.1-8056]]
org.apache.catalina.LifecycleException: Failed to start component [Connector[HTTP/1.1-8056]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.catalina.core.StandardService.addConnector(StandardService.java:225) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.addPreviouslyRemovedConnectors(TomcatEmbeddedServletContainer.java:250) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:193) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:297) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:145) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) [spring-context-4.3.13.RELEASE.jar:4.3.13.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.9.RELEASE.jar:1.5.9.RELEASE]
at com.springboot.ashish.springbootdemo.SpringbootdemoApplication.main(SpringbootdemoApplication.java:23) [classes/:na]
Caused by: org.apache.catalina.LifecycleException: service.getName(): "Tomcat"; Protocol handler start failed
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1031) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
... 13 common frames omitted
Caused by: java.io.IOException: Unable to establish loopback connection
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source) ~[na:1.8.0_121]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_121]
at sun.nio.ch.PipeImpl.<init>(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source) ~[na:1.8.0_121]
at java.nio.channels.Pipe.open(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source) ~[na:1.8.0_121]
at java.nio.channels.Selector.open(Unknown Source) ~[na:1.8.0_121]
at org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector(NioSelectorPool.java:66) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.tomcat.util.net.NioSelectorPool.open(NioSelectorPool.java:130) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:227) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:990) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:635) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1022) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
... 14 common frames omitted
Caused by: java.net.ConnectException: Connection timed out: connect
at sun.nio.ch.Net.connect0(Native Method) ~[na:1.8.0_121]
at sun.nio.ch.Net.connect(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.Net.connect(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.SocketChannelImpl.connect(Unknown Source) ~[na:1.8.0_121]
at java.nio.channels.SocketChannel.open(Unknown Source) ~[na:1.8.0_121]
at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(Unknown Source) ~[na:1.8.0_121]
... 29 common frames omitted
2018-01-23 11:34:51.069 INFO 10432 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-01-23 11:34:51.084 INFO 10432 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-01-23 11:34:51.100 ERROR 10432 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
The Tomcat connector configured to listen on port 8056 failed to start. The port may already be in use or the connector may be misconfigured.
Action:
Verify the connector's configuration, identify and stop any process that's listening on port 8056, or configure this application to listen on another port.

Answer 1

try to kill your tomcat/java running instance
In windows -> open task manager go to process list all java instance
running in memory
in Linux system use: ps -aef | grep java it will show the list of
running instance of tomcat and java close all and than again try.
Hope it will resolve your problem , you can also check your application.properties file as following
#--------------------------------
# Tomcat Port
#----------------------------------
server.port = 8080
# ----------------------------------------
# Logging Level
# ----------------------------------------
logging.level.root=error
logging.level.org.springframework=info
logging.level.org.hibernate=error
# ----------------------------------------
# MySQL DataBase Connection Properties
# ----------------------------------------
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://localhost:3306/db
spring.datasource.username=root
spring.datasource.password=root
spring.jpa.database-platform=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql=true
# ----------------------------------------
# ACTUATOR PROPERTIES
# ----------------------------------------
endpoints.actuator.enabled=false
management.security.enabled=false
# ----------------------------------------
# DevTols PROPERTIES
# ----------------------------------------
spring.devtools.restart.enabled=true
# ----------------------------------------
# JSP PREFIX/POSTFIX PROPERTIES
# ----------------------------------------
#spring.thymeleaf.prefix=/view/
#spring.thymeleaf.suffix=.html