应用程序上下文被加载两次 - Spring Boot [英] Application context being loaded twice - Spring Boot
问题描述
我有一个相当简单的设置.一个包含 3 个模块的 Maven 项目:core/webapp/model.我正在使用 Spring Boot 来启动我的应用程序.在 webapp 中，我有一个简单的类 WebappConfig，如下所示:
I have a fairly simple setup. A maven project with 3 modules : core/webapp/model. I'm using Spring boot to gear up my application. In webapp, i have a simple class WebappConfig as follows:
@Configuration
@EnableAutoConfiguration
@ComponentScan(excludeFilters = @ComponentScan.Filter(Configuration.class))
public class WebappConfig {
public static void main(String[] args) {
SpringApplication app = new SpringApplication(WebappConfig.class);
app.setAdditionalProfiles("dev");
app.run(args);
}
}
和核心/模型模块中的几个类.我的容器应用点是:
and few classes in core/model module. My container-application point is :
public class AbcdXml extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(WebappConfig.class);
}
}
而且没有 web.xml！我的模型的 pom 具有以下与 Spring Boot 相关的依赖项:
And no web.xml! My model's pom has following spring boot related dependency :
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
Core 的 pom.xml :
Core's pom.xml :
<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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-batch</artifactId>
</dependency>
现在通过 Run as 运行 WebappConfig -> Java 应用程序运行良好，但我需要将该项目部署为 tomcat7 上的战争.Webapp 的包装是一场战争.除了 tomcat-jdbc 和 tomcat-tuli jar 之外，lib 中没有 tomcat 提供的 jar(应该不是问题?).
Now running WebappConfig via Run as -> Java application works perfectly but i need to deploy the project as a war on tomcat7. Webapp's packaging is war. There is no tomcat provided jar's in lib except tomcat-jdbc and tomcat-tuli jar(Shouldn't be an issue?).
当我部署 abcd.war 时，applicationcontext 被加载两次并导致以下错误 stracktrace :
When i deploy my abcd.war, applicationcontext is getting loaded twice and result in following error stracktrace :
2014-06-27 11:06:08.445 INFO 23467 --- [ost-startStop-1] o.a.c.c.C.[.[localhost].[/abcd] : Initializing Spring embedded WebApplicationContext
2014-06-27 11:06:08.446 INFO 23467 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 19046 ms
2014-06-27 11:06:21.308 INFO 23467 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2014-06-27 11:06:21.313 INFO 23467 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'errorPageFilter' to: [/*]
2014-06-27 11:06:21.314 INFO 23467 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2014-06-27 11:06:26.073 INFO 23467 --- [ost-startStop-1] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2014-06-27 11:06:26.127 INFO 23467 --- [ost-startStop-1] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2014-06-27 11:06:26.511 INFO 23467 --- [ost-startStop-1] org.hibernate.Version : HHH000412: Hibernate Core {4.3.1.Final}
2014-06-27 11:06:26.521 INFO 23467 --- [ost-startStop-1] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2014-06-27 11:06:26.527 INFO 23467 --- [ost-startStop-1] org.hibernate.cfg.Environment : HHH000021: Bytecode provider name : javassist
//some info messages from spring boot
2014-06-27 11:07:31.664 INFO 23467 --- [ost-startStop-1] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-06-27 11:07:33.095 INFO 23467 --- [ost-startStop-1] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-06-27 11:07:33.096 INFO 23467 --- [ost-startStop-1] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2014-06-27 11:07:36.080 INFO 23467 --- [ost-startStop-1] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2014-06-27 11:08:49.583 INFO 23467 --- [ost-startStop-1] o.s.boot.SpringApplication : Started application in 183.152 seconds (JVM running for 210.258)
2014-06-27 11:12:29.229 ERROR 23467 --- [ost-startStop-1] o.a.c.c.C.[.[localhost].[/abcd] : Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
java.lang.IllegalStateException: Cannot initialize context because there is already a root application context present - check whether you have multiple ContextLoader* definitions in your web.xml!
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:277)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4937)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:976)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1653)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
没有我之前提到的 web.xml.
There is no web.xml as i mentioned earlier.
一些有趣的事情，我不知道为什么:
Few interesting things that i can't figure out why :
- 爆发战争后，tomcat以某种方式创建了一个默认为web.xml的ROOT文件夹[一定是Spring引导配置错误.我该如何纠正?请指点?]
- 即使我在 AbcdXml.java 中返回相同的应用程序"SpringApplicationBuilder，我也面临相同的应用程序上下文被加载两次的问题.
感谢您的帮助！
编辑 1:
在ROOT文件夹中生成的web.xml的内容:
Content of web.xml that is generated in ROOT folder :
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd" version="2.5">
</web-app>
推荐答案
如果您的应用包含 jersey-spring3 并且您没有采取措施禁用，它会尝试为您创建一个 ApplicationContext(有帮助，没有).有一种方法可以关闭它(在 WebApplicationInitializer 中):
If your app includes jersey-spring3 and you don't take steps to disable, it will try to create an ApplicationContext for you (helpful, not). There is a way to switch it off (in a WebApplicationInitializer):
servletContext.setInitParameter("contextConfigLocation", "<NONE>");
或者只是使用这个:https://github.com/dsyer/spring-boot-jersey(包含为依赖项).
Or just use this: https://github.com/dsyer/spring-boot-jersey (include as a dependency).
这篇关于应用程序上下文被加载两次 - Spring Boot的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
