Java.lang.NoClassDefFoundError: com/google/gwt/event/dom/client/HasClickHandlers at java.lang.ClassLoader.defineClass1(Native Method) at ...
然而，在WEB-INF / lib中，有一个jar包含类......
但是tomcat表示：
INFO: validateJarFile(C:\Users\Boss\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\applicLiquidator\WEB-INF\lib\gwt-dev-2.3.0.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
márc. 10, 2014 1:54:55 DU org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(C:\Users\Boss\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\applicLiquidator\WEB-INF\lib\gwt-user-2.3.0.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
那么如何在违反servlet.class的情况下在运行时使这些类可用？
更新： 由于Servlet.class违规，并且由于运行时需要这些罐子，所以看起来像一个恶性循环:(
POM。 XML
<?xml version="1.0" encoding="UTF-8"?>
<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>Reignsoft</groupId>
<artifactId>Liquidator</artifactId>
<packaging>war</packaging>
<version>0.2</version>
<name>Felszámoló Ügyviteli Rendszer</name>
<ciManagement>
<system>hudson</system>
<url>http://reign.ti:58084/jenkins/job/Liquidator%20-%20Maven/</url>
</ciManagement>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<vaadin.version>6.8.13</vaadin.version>
<jpacontainer.version>2.0.0</jpacontainer.version>
<gwt.version>2.3.0</gwt.version>
<gwt.plugin.version>2.3.0-1</gwt.plugin.version>
<url>http://localhost:8080/manager/text</url>
<path>/applicLiquidator</path>
<update>true</update>
<username>tomcat</username>
<password>tomcat</password>
</properties>
<repositories>
<repository>
<id>vaadin-addons</id>
<url>http://maven.vaadin.com/vaadin-addons</url>
</repository>
<repository>
<id>vaadin-snapshots</id>
<url>http://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>EclipseLink Repo</id>
<url>http://www.eclipse.org/downloads/download.php?r=1&nf=1&file=/rt/eclipselink/maven.repo</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>com.vaadin.addon</groupId>
<artifactId>jpacontainer-addon-agpl-3.0</artifactId>
<version>${jpacontainer.version}</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.vaadin.addons</groupId>
<artifactId>customfield</artifactId>
<version>0.9.3</version>
</dependency>
<dependency>
<groupId>com.vaadin.addon</groupId>
<artifactId>beanvalidation-addon</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>org.vaadin.addons</groupId>
<artifactId>filteringtable</artifactId>
<version>0.8.4</version>
</dependency>
<dependency>
<groupId>org.vaadin.addons</groupId>
<artifactId>popupbutton</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.0.0</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.3.160</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.2.0.Final</version>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwt.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-dev</artifactId>
<version>${gwt.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<classifier>sources</classifier>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
<dependency>
<groupId>org.easymock</groupId>
<artifactId>easymockclassextension</artifactId>
<version>3.2</version>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-easymock</artifactId>
<version>1.5.2</version>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>1.5.2</version>
</dependency>
<dependency>
<groupId>org.vaadin.addon</groupId>
<artifactId>confirmdialog</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire</artifactId>
<version>2.16</version>
<type>pom</type>
</dependency>
<!-- for PDF document generatioon -->
<!-- 1.0 rather than 1.1 due to http://apache-fop.1065347.n5.nabble.com/Maven-dependencies-for-fop-1-1-td37437.html -->
<dependency>
<groupId>org.apache.xmlgraphics</groupId>
<artifactId>fop</artifactId>
<version>1.0</version>
</dependency>
<!-- for Office document generation -->
<dependency>
<groupId>org.docx4j</groupId>
<artifactId>docx4j</artifactId>
<version> 3.0.0</version>
</dependency>
<!-- for generating HTML pages, a HTML template engine -->
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.20</version>
</dependency>
<!-- for drawing with GWT graphics -->
<!--
<dependency>
<groupId>org.vaadin.addons</groupId>
<artifactId>gwt-graphics</artifactId>
<version>1.0.0</version>
</dependency> -->
</dependencies>
<build>
<pluginManagement>
<plugins>
<!--This plugin's configuration is used to store Eclipse m2e settings
only. It has no influence on the Maven build itself. -->
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>com.vaadin</groupId>
<artifactId>
vaadin-maven-plugin
</artifactId>
<versionRange>
[1.0.2,)
</versionRange>
<goals>
<goal>update-widgetset</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore></ignore>
</action>
</pluginExecution>
<pluginExecution>
<pluginExecutionFilter>
<groupId>org.codehaus.mojo</groupId>
<artifactId>
gwt-maven-plugin
</artifactId>
<versionRange>
[${gwt.plugin.version},)
</versionRange>
<goals>
<goal>resources</goal>
<goal>compile</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore></ignore>
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<url>${url}</url>
<username>${username}</username>
<password>${password}</password>
<path>${path}</path>
<update>${update}</update>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<!-- Uncomment to enable widgetset compilation -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>${gwt.plugin.version}</version>
<configuration>
<extraJvmArgs>-Xmx512M -Xss1024k</extraJvmArgs>
<webappDirectory>${basedir}/src/main/webapp/VAADIN/widgetsets
</webappDirectory>
<hostedWebapp>${basedir}/src/main/webapp/VAADIN/widgetsets
</hostedWebapp>
<noServer>true</noServer>
<draftCompile>false</draftCompile>
<style>OBF</style>
<runTarget>http://localhost:8080/</runTarget>
</configuration>
<executions>
<execution>
<goals>
<goal>resources</goal>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<filesets>
<fileset>
<directory>src/main/webapp/VAADIN/widgetsets</directory>
</fileset>
</filesets>
</configuration>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>1.0.2</version>
<executions>
<execution>
<goals>
<goal>update-widgetset</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.surefire</groupId>
<artifactId>surefire</artifactId>
<version>2.16</version>
<configuration>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</configuration>
</plugin>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
答案 0 :(得分：0)
我猜你在你的应用程序中捆绑了一个版本的Servlet。
Tomcat不喜欢这样，所以它停止加载，它根本没有到达你真正需要的类。如果您使用的是maven，请将servlet依赖项设置为：
<scope>provided</scope>
<强>更新
相关段落是：
The classloader that a container uses to load a servlet in a WAR must
allow the developer to load any resources contained in library JARs within
the WAR following normal J2SE semantics using getResource.
It must not allow the WAR to override J2SE or Java servlet API classes.
It is further recommended that the loader not allow servlets in the WAR
access to the web container’s implementation classes.
It is recommended also that the application class loader be implemented
so that classes and resources packaged within the WAR are loaded in
preference to classes and resources residing in container-wide library JARs.
请发布你的maven pom依赖项并仔细检查生成的war文件是否包含一个包含servlet类的jar。