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我正在尝试在Eclipse Luna中设置动态Web项目。我已经设置了Tomcat 8服务器以便能够部署到。我正在尝试部署一个小型Spring MVC（Spring 4）项目。当我这样做时，出现以下例外情况：使用Maven将Spring MVC导入Tomcat 8：使用SerializableTypeWrapper导出NullPointerException
Aug 27, 2014 12:52:52 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /SponsoredNetIDs threw load() exception
java.lang.NullPointerException
at org.springframework.core.SerializableTypeWrapper$TypeProxyInvocationHandler.invoke(SerializableTypeWrapper.java:239)
at org.springframework.core.$Proxy4.hashCode(Unknown Source)
at org.springframework.util.ObjectUtils.nullSafeHashCode(ObjectUtils.java:273)
at org.springframework.core.ResolvableType.hashCode(ResolvableType.java:811)
at org.springframework.util.ConcurrentReferenceHashMap.getHash(ConcurrentReferenceHashMap.java:214)
at org.springframework.util.ConcurrentReferenceHashMap.getReference(ConcurrentReferenceHashMap.java:246)
at org.springframework.util.ConcurrentReferenceHashMap.get(ConcurrentReferenceHashMap.java:226)
at org.springframework.core.ResolvableType.forType(ResolvableType.java:1186)
at org.springframework.core.ResolvableType.forType(ResolvableType.java:1165)
at org.springframework.core.ResolvableType.forTypes(ResolvableType.java:844)
at org.springframework.core.ResolvableType.getInterfaces(ResolvableType.java:403)
at org.springframework.core.ResolvableType.as(ResolvableType.java:365)
at org.springframework.core.convert.support.GenericConversionService.getRequiredTypeInfo(GenericConversionService.java:266)
at org.springframework.core.convert.support.GenericConversionService.addConverterFactory(GenericConversionService.java:103)
at org.springframework.core.convert.support.DefaultConversionService.addScalarConverters(DefaultConversionService.java:79)
at org.springframework.core.convert.support.DefaultConversionService.addDefaultConverters(DefaultConversionService.java:63)
at org.springframework.core.convert.support.DefaultConversionService.<init>(DefaultConversionService.java:50)
at org.springframework.core.env.AbstractPropertyResolver.<init>(AbstractPropertyResolver.java:41)
at org.springframework.core.env.PropertySourcesPropertyResolver.<init>(PropertySourcesPropertyResolver.java:41)
at org.springframework.core.env.AbstractEnvironment.<init>(AbstractEnvironment.java:112)
at org.springframework.core.env.StandardEnvironment.<init>(StandardEnvironment.java:54)
at org.springframework.web.context.support.StandardServletEnvironment.<init>(StandardServletEnvironment.java:44)
at org.springframework.web.servlet.HttpServletBean.createEnvironment(HttpServletBean.java:215)
at org.springframework.web.servlet.HttpServletBean.getEnvironment(HttpServletBean.java:205)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:126)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1241)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1154)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1041)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4923)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5209)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
我为此使用了Maven 3.2.3。
我的POM文件看起来像：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<!-- The Basics -->
<groupId>com.company</groupId>
<artifactId>sponsorednetids</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<!-- Project Information -->
<name>Sponsored NetID</name>
<!-- The Build -->
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<webXml>WebRoot\WEB-INF\web.xml</webXml>
<webResources>
<resource>
<directory>src\main\resources</directory>
</resource>
</webResources>
<archive>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<!-- Dependencies -->
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring-webmvc.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring-web.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>${commons-lang.version}</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>${commons-logging.version}</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet-api.version}</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>${taglibs-standard.version}</version>
</dependency>
</dependencies>
<!-- Environment Settings -->
<properties>
<junit.version>4.11</junit.version>
<spring-webmvc.version>4.0.6.RELEASE</spring-webmvc.version>
<spring-web.version>4.0.6.RELEASE</spring-web.version>
<spring.version>2.5.6</spring.version>
<commons-lang.version>2.6</commons-lang.version>
<commons-logging.version>1.2</commons-logging.version>
<jstl.version>1.2</jstl.version>
<log4j.version>1.2.17</log4j.version>
<servlet-api.version>3.1.0</servlet-api.version>
<taglibs-standard.version>1.1.2</taglibs-standard.version>
</properties>
</project>
的servlet.xml中：
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<context:component-scan base-package="com.company.sponsorednetids.controller" />
<bean class="com.company.sponsorednetids.controller.InitiatorDashboardValidator" />
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename" value="messages" />
</bean>
<bean id="exceptionResolver" class="com.company.controller.ExceptionHandler">
<property name="errorView" value="exception"/>
</bean>
<!-- Special id known to ModelAndView in Spring, which can map JSPs to the prefix below -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="view.html">initiatorDashboardController</prop>
</props>
</property>
</bean>
</beans>
最后我的web.xml：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>Sponsored Net IDs</display-name>
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>sponsorednetids.root</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<servlet>
<servlet-name>sponsorednetids</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>sponsorednetids</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<session-config>
<session-timeout>60</session-timeout>
</session-config>
</web-app>
，当我去抛出异常到Eclipse中的项目，右键单击并转到“调试服务器”。那是在启动过程中。
我很感激帮助！
在扫描的类路径中是否有任何'@ Configuration' bean？异常是否发生在没有''的情况下？ –
2014-08-27 18:15:26
我不知道。这是Spring 4的第一次使用。所有其他项目都使用Spring 2. – Ascalonian 2014-08-27 18:18:30
还要注意，servlet依赖项没有标记为“提供”。这可能会导致各种意外行为（主要是'ClassCastException'）。但是，它可能与您的问题没有关系。 – 2014-08-27 18:20:42