Question

我在新工作中继承了Javas的几个项目，但是我在设置方面遇到了一些问题。我正面临一个研究如此普遍的问题。 “java.lang.NoClassDefFoundError：org / hibernate / Session”，把所有的jar甚至不必要的hibernate映射到classpath中。

我正在使用tomcat 7，hirbernat 4，jre7。

每个项目都扩展了包含lib文件夹中所有必需jar的compnet。

我是否需要将已经映射过的jar放在这个项目中？

错误就在这里：

    @Override
public void init(ServletConfig config) throws ServletException {
    super.init(config);
    HibernateUtil.currentSession();
}

类路径：

<classpathentry kind="src" path="src"/>
<classpathentry exported="true" kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/xstream 1.3/xpp3_min-1.1.4c.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/xstream 1.3/xstream-1.3.1.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v6.0"/>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/commons fileupload 1.2.1/commons-fileupload-1.2.1.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/antlr.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/commons-collections.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/dom4j.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/ejb3-persistence.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/hibernate-annotations.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/hibernate-commons-annotations.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/hibernate-validator.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/hibernate3.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/javassist.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/jta.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/jtds-1.2.4.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/log4j.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/slf4j-api.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/hibernate 3/slf4j-log4j12.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/commons logging/commons-logging-1.1.1.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/commons logging/commons-logging-adapters-1.1.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/commons logging/commons-logging-api-1.1.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry combineaccessrules="false" exported="true" kind="src" path="/pkg_ocorrencia"/>
<classpathentry combineaccessrules="false" exported="true" kind="src" path="/pkg_mandado"/>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/commons-beanutils-1.8.2.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/commons-digester-1.7.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/groovy-all-1.5.5.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/iText-2.1.0.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/jasperreports-3.7.4.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/jasperreports-chart-themes-3.7.4.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/jasperreports-extensions-3.5.3.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/jasperreports-fonts-3.7.4.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/spring.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/xalan.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/jfreechart-1.0.12.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/jasper - ireport 3.7.4/jcommon-1.0.15.jar">
    <attributes>
        <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
    </attributes>
</classpathentry>
<classpathentry combineaccessrules="false" kind="src" path="/Compnet"/>
<classpathentry exported="true" kind="lib" path="/Compnet/lib/commons email 1.2/commons-email-1.2.jar"/>
<classpathentry kind="lib" path="D:/Tomcat 7/apache-tomcat-7.0.27/lib/servlet-api.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/antlr-2.7.7.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/c3p0-0.9.1.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/dom4j-1.6.1.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/ehcache-core-2.4.3.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-c3p0-4.1.4.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-commons-annotations-4.0.1.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-core-4.1.4.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-ehcache-4.1.4.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-entitymanager-4.1.4.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-envers-4.1.4.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-infinispan-4.1.4.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-jpa-2.0-api-1.0.1.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/hibernate-proxool-4.1.4.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/infinispan-core-5.1.4.FINAL.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/javassist-3.15.0-GA.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/jboss-logging-3.1.0.GA.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/jboss-marshalling-1.3.11.GA.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/jboss-marshalling-river-1.3.11.GA.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/jboss-transaction-api_1.1_spec-1.0.0.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/jgroups-3.0.9.Final.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/proxool-0.8.3.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/rhq-pluginAnnotations-3.0.4.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/slf4j-api-1.6.1.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/stax2-api-3.1.1.jar"/>
<classpathentry kind="lib" path="/Compnet/lib/hibernate4/woodstox-core-asl-4.1.1.jar"/>

<classpathentry kind="output" path="build/classes"/>

stacktrance：

java.lang.NoClassDefFoundError：org / hibernate / Session 在br.com.flex4j.servlet.genericActionServlet.init（genericActionServlet.java:29）在org.apache.catalina.core.StandardWrapper.loadServlet（StandardWrapper.java:1161）在org.apache.catalina.core.StandardWrapper.allocate（StandardWrapper.java:806）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:129）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:175）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:128） at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:102）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:109）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:263）在org.apache.coyote.http11.Http11Processor.process（Http11Processor.java:844）在org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process（Http11Protocol.java:584）在org.apache.tomcat.util.net.JIoEndpoint $ Worker.run（JIoEndpoint.java:447）在java.lang.Thread.run（未知来源）引起：java.lang.ClassNotFoundException：org.hibernate.Session 在org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1358）在org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1204） ......还有13个

Jun 21,2012 3:39:22 PM org.apache.catalina.core.StandardWrapperValve invoke SEVERE：为servlet genericActionServlet分配异常 java.lang.ClassNotFoundException：org.hibernate.Session 在org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1358）在org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1204）在br.com.flex4j.servlet.genericActionServlet.init（genericActionServlet.java:29）在org.apache.catalina.core.StandardWrapper.loadServlet（StandardWrapper.java:1161）在org.apache.catalina.core.StandardWrapper.allocate（StandardWrapper.java:806）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:129）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:175）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:128） at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:102）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:109）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:263）在org.apache.coyote.http11.Http11Processor.process（Http11Processor.java:844）在org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process（Http11Protocol.java:584）在org.apache.tomcat.util.net.JIoEndpoint $ Worker.run（JIoEndpoint.java:447）在java.lang.Thread.run（未知来源）

编辑：

我的项目的ClassPath： properties>java build path

Answer 1

根据我的理解，您提供的类路径xml由Eclipse使用，它与您的Web应用程序类路径无关。你得到NoClassDefFoundError的原因是Tomcat无法找到Hibernate类。确保您的Web模块在WEB-INF / lib目录中包含所有必需的jar。

Answer 2

将所有JARS添加到WEB-INF并在项目上执行构建路径。

Answer 3

要在eclipse中添加jar，您有两种选择：

右键点击项目即可 properties - ＆gt;点击java build path - ＆gt;配置构建路径 - ＆gt;图书馆 - ＆gt; 并选择添加外部jar按钮。它将打开一个窗口，您可以在其中添加所需的所有罐子。

第二个选项是将jar直接粘贴到lib文件夹。 lib文件夹位于Web内容中 - ＆gt; WEB-INF - ＆gt;库。

使用其中任何一个。

java.lang.NoClassDefFoundError：设置了org / hibernate / Session hibernate jars

3 个答案: