spring boot 裏面的一系列坑

    額，簡單的說啊。只是爲了記錄一下本身遇到的問題，記錄下來方便之後排查，先說spring Boot的打包。通常咱們在maven裏面這樣配置

       

<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<fork>true</fork>
				</configuration>
			</plugin>

方便打包成可運行的jar包，可是我感受每次這樣打包太大了。每次上傳部署太浪費時間了。因此我直接改爲普通的打包方式。

<plugin>

				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-jar-plugin</artifactId>
				<version>2.4</version>
				<configuration>
					<archive>
						<manifest>
							<mainClass>com.turing.cloud.CloudApplication</mainClass>
						</manifest>
					</archive>
				</configuration>
			</plugin>

 

而後使用

mvn dependency:copy-dependencies -DoutputDirectory=lib  -DincludeScope=runtime

把依賴包複製到lib下面。第一次部署的時候上傳lib，以後就只須要上傳項目自己了。而後直接

java -jar  -Djava.ext.dirs=lib    app.jar

            沒想到啓都起不起來。第一步是報錯關於Tomcat的。

org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at com.turing.cloud.CloudApplication.main(CloudApplication.java:12) [cloud-webcontroller-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
Caused by: org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
        at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.initialize(TomcatEmbeddedServletContainer.java:123) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.<init>(TomcatEmbeddedServletContainer.java:84) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getTomcatEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:554) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:179) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:164) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        ... 8 common frames omitted
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardServer[-1]]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        at org.apache.catalina.startup.Tomcat.start(Tomcat.java:367) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.initialize(TomcatEmbeddedServletContainer.java:99) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
        ... 13 common frames omitted
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Tomcat]]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:793) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        ... 15 common frames omitted
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat]]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        ... 17 common frames omitted
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
        at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:948) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.5.27.jar:8.5.27]
        ... 19 common frames omitted

後來才知道里面有個servlet-api-2.5衝突了。因而刪掉。再次啓動。

        結果……不讀取個人yml配置了。因而加上啓動參數再次啓動

java  -jar  -Djava.ext.dirs=lib  -Dspring.profiles.active=test     app.jar

這樣我指定了profile了。日誌也顯示使用test profile了。可是以後感受仍是沒有讀取配置，由於我server端口寫的8088，啓動完成仍是8080.因而使用eclipse 遠程調試。。。。終於在 org.springframework.boot.env.YamlPropertySourceLoader 髮型這樣一行。

if (ClassUtils.isPresent("org.yaml.snakeyaml.Yaml", null))

真相大白了，缺包嘛。因而maven裏面加上

<dependency>
			<groupId>org.yaml</groupId>
			<artifactId>snakeyaml</artifactId>
		</dependency>

OK，終於正常了。還有一個關於spring redis session的坑，再寫。。。。。