在更新我的pom.xml以升级某些罐子（例如vraptor和hibernate）时，我遇到了麻烦。我的环境是Web项目，maven，tomcat 7，vraptor，jpa，osx特立独行，在更新罐子之前，一切正常，在更新我在启动tomcat时收到此错误：
SEVERE: Exception starting filter vraptor
java.lang.NoClassDefFoundError: br/com/caelum/vraptor/validator/Validator
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2483)
at java.lang.Class.getDeclaredConstructors(Class.java:1891)
at br.com.caelum.vraptor.ioc.guice.GuiceComponentRegistry.getConstructor(GuiceComponentRegistry.java:154)
at br.com.caelum.vraptor.ioc.guice.GuiceComponentRegistry.bindToConstructor(GuiceComponentRegistry.java:140)
at br.com.caelum.vraptor.ioc.guice.GuiceComponentRegistry.register(GuiceComponentRegistry.java:84)
at br.com.caelum.vraptor.ioc.guice.GuiceComponentRegistry.deepRegister(GuiceComponentRegistry.java:101)
at br.com.caelum.vraptor.scan.DynamicWebAppBootstrap.configure(DynamicWebAppBootstrap.java:46)
at br.com.caelum.vraptor.ioc.guice.GuiceProvider$2.configure(GuiceProvider.java:123)
at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:223)
at com.google.inject.spi.Elements.getElements(Elements.java:101)
at com.google.inject.spi.Elements.getElements(Elements.java:92)
at com.google.inject.util.Modules$RealOverriddenModuleBuilder$1.configure(Modules.java:172)
at com.google.inject.AbstractModule.configure(AbstractModule.java:59)
at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:223)
at com.google.inject.spi.Elements.getElements(Elements.java:101)
at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:133)
at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:103)
at com.google.inject.Guice.createInjector(Guice.java:95)
at com.google.inject.Guice.createInjector(Guice.java:83)
at br.com.caelum.vraptor.ioc.guice.GuiceProvider.start(GuiceProvider.java:97)
at br.com.caelum.vraptor.VRaptor.init(VRaptor.java:119)
at br.com.caelum.vraptor.VRaptor.init(VRaptor.java:113)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4797)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5473)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.ClassNotFoundException: br.com.caelum.vraptor.validator.Validator
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
... 36 more
关于错误的信息，我在其他软件包中找到了此接口：br.com.caelum.vraptor.Validator
这是我的pom.xml：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>br.com.eco</groupId>
<artifactId>e-co</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.vraptor.version>3.5.3</project.vraptor.version>
</properties>
<build>
<sourceDirectory>src</sourceDirectory>
<finalName>${project.artifactId}-${project.version}</finalName>
<resources>
<resource>
<directory>src</directory>
<includes>
<include>**/*.properties</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1-beta-1</version>
<configuration>
<webappDirectory>${project.basedir}/WebContent</webappDirectory>
<warSourceDirectory>${project.basedir}/WebContent</warSourceDirectory>
<webXml>${project.basedir}/WebContent/WEB-INF/web.xml</webXml>
<packagingIncludes>**/*.properties,**/*.jsp,**/*.jar,**/*.class,theme/**/*,images/**/*,**/*.xml,**/*.swf,**/*.tld,**/*.txt</packagingIncludes>
<archive>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>process-sources</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>WebContent/WEB-INF/lib/</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>br.com.caelum</groupId>
<artifactId>vraptor</artifactId>
<version>${project.vraptor.version}</version>
<optional>true</optional>
<scope>compile</scope>
<exclusions>
<exclusion>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>br.com.caelum.vraptor</groupId>
<artifactId>vraptor-environment</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.3.0.Final</version>
</dependency>
<dependency>
<groupId>br.com.caelum.vraptor</groupId>
<artifactId>vraptor-jpa</artifactId>
<version>4.0.0</version> <!-- or the latest version -->
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>4.3.0.Final</version>
</dependency>
</dependencies>
</project>
我真的找不到任何原因，如果有人遇到麻烦并且可以解决，请在这种情况下帮助我。
干杯
最佳答案
弄清楚升级过程中发生了什么。我使用的项目是一个管理EntityManager vraptor-jpa实例的jar，当我保留更新时，它会出现错误。兼容性可能是：
版本3.4.2中的vraptor，请使用插件vraptor-jpa-4.0.0.jar
vraptor（版本3.5.3）中，插件使用vraptor-jpa-1.0.1.jar
此更改足以解决问题。
关于java - 将vRaptor升级到3.5.3 java.lang.NoClassDefFoundError:br/com/caelum/vraptor/validator/Validator，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21605298/