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启动来设置我的应用程序 . 在webapp中,我有一个简单的类WebappConfig,如下所示:
@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);
}
}
核心/模型模块中的几个类 . 我的容器应用点是:
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相关的依赖关系:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
Core的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>
现在通过运行运行WebappConfig - > Java应用程序运行完美,但我需要将项目部署为tomcat7上的战争 . Webapp的包装是战争 . 除了tomcat-jdbc和tomcat-tuli jar之外,lib中没有tomcat提供的jar(应该不是问题吗?) .
当我部署我的abcd.war时,applicationcontext被加载两次并导致跟随错误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)
我之前提到过没有web.xml .
几个有趣的事情,我无法弄清楚为什么:
-
爆炸战争后,tomcat以某种方式创建了一个带有默认web.xml的ROOT文件夹[必须是Spring启动配置错误 . 我怎么能纠正它?指针好吗?]
-
即使我在AbcdXml.java中返回相同的'application' SpringApplicationBuilder,我也面临同样的问题,即applicationcontext被加载了两次 .
谢谢你的帮助!
编辑1:
在ROOT文件夹中生成的web.xml的内容:
<?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>
4 回答
如果你的应用程序包含jersey-spring3并且你没有采取步骤来禁用它,它将尝试为你创建一个
ApplicationContext
(有帮助,而不是) . 有一种方法可以将其关闭(在WebApplicationInitializer
中):或者只使用它:https://github.com/dsyer/spring-boot-jersey(包括作为依赖项) .
在我的情况下 - 我遇到了同样的问题 - 看到Spring
splash screen
两次 - 这是因为我有2个类扩展了SpringBootServletInitializer
. 一个被称为SpringBootWebApplication
,另一个被称为ServletInitializer
. 我刚刚删除了ServletInitializer
,它运行正常 . 不知道为什么有两个 class - 也许是因为我从两个不同的例子中得到启发来组装我需要的东西 .在我的情况下,罪魁祸首是使用Spring Boot 1.3.0.M4,以及Jersey 2.21 . 当我将Spring Boot降级到1.2.6.RELEASE时,问题就消失了 . 我唯一要做的就是显式覆盖以下属性,因为我需要Spring 4.2.0支持Hibernate 5,而jackson 2.6.2支持JSR310(java8 java.time)支持:
编辑:从spring-boot 1.3.0.RELEASE开始,这个bug仍然存在 . 见github
来自API的@EnableAutoConfiuguration说"Enable auto-configuration of the Spring Application Context, attempting to guess and configure beans that you are likely to need."
@ComponentScan也会实例化bean . IT将扫描包,查找并注册bean .
当你使用这两个注释时,我猜这就是它加载两次的原因 .