Springboot项目以war包形式发布到tomcat流程及问题_tomcat springboot war包

由于项目需求，所以两个项目需要放到同一个tomcat中，且端口号相同。

一、springboot打war包

1.pom.xml文件配置

1.添加war包

<packaging>war</packaging>

2.添加排除内置tomcat依赖

 <!--排除tomcat-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

3.添加war包依赖以设置名称

<build>
        <!--war包名称-->
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <!--对项目打war包依赖-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.0.0</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
 
        </plugins>
    </build>

2.启动类配置

1.继承SpringBootServletInitializer类，重写configure方法

@SpringBootApplication(scanBasePackages = "com.hdro")
@EnableTransactionManagement //事务
public class HdxxcjProApplication extends SpringBootServletInitializer {
 
    public static void main(String[] args) {
        SpringApplication.run(HdxxcjProApplication.class, args);
    }
 
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(HdxxcjProApplication.class);
    }
}

3.项目发布

1.运行命令（在idea中，或者doc窗口都可以），打war包

mvn clean install

出现 BUILD SUCCESS 表示成功

2.复制war包，将war包放到tomcat->webapps中，并配置项目访问路径（conf->server.xml文件中）

<Context path="/xaxxcj" docBase="xaxxcj" reloadable="true" debug="0">  

综上，启动项目 bin->startup.bat

二、项目启动遇到的问题

启动tomcat时，出现如下错误

03-Jan-2024 15:13:27.614 严重 [Catalina-startStop-1] org.apache.catalina.core.ContainerBase.startInternal 子容器启动失败
	java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: 无法启动组件[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/hdxxcjPro]]
		at java.util.concurrent.FutureTask.report(FutureTask.java:122)
		at java.util.concurrent.FutureTask.get(FutureTask.java:188)
		at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:892)
		at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:793)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1362)
		at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1352)
		at java.util.concurrent.FutureTask.run(FutureTask.java:262)
		at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
		at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
		at java.lang.Thread.run(Thread.java:745)
	Caused by: org.apache.catalina.LifecycleException: 无法启动组件[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/hdxxcjPro]]
		at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
		... 6 more
	Caused by: java.lang.UnsupportedClassVersionError: org/springframework/web/SpringServletContainerInitializer : Unsupported major.minor version 52.0 (无法载入的类 [org.springframework.web.SpringServletContainerInitializer])
		at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2481)
		at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:881)
		at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1384)
		at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1228)
		at java.lang.Class.forName0(Native Method)
		at java.lang.Class.forName(Class.java:278)
		at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:241)
		at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:212)
		at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1590)
		at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1089)
		at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:780)
		at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:300)
		at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
		at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4855)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		... 6 more
03-Jan-2024 15:13:28.808 严重 [main] org.apache.catalina.core.ContainerBase.startInternal 子容器启动失败
	java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: 子容器启动失败
		at java.util.concurrent.FutureTask.report(FutureTask.java:122)
		at java.util.concurrent.FutureTask.get(FutureTask.java:188)

结合网上的信息，发现时jdk版本问题，之前装的是jdk1.7，但springboot项目用的是jdk1.8，所以启动报错，出现闪退情况。把本地版本更新为1.8，问题消失，tomcat启动正常。