訪問Web服務時出現NoClassDefFoundError

Question

我目前正在嘗試將Web服務合並到我的應用程序中。 我無權訪問Web服務本身，但可以通過jar文件進行訪問。 以下是訪問Web服務的代碼：

import java.util.List;
import java.io.Serializable;
import java.lang.String;
import com.zf.fileviewing.connection.FVConnectData;
import com.zf.fileviewing.connection.FVConnector;
import java.net.URL;

public class CheckOutAxalant implements Serializable
{
private static final long serialVersionUID = 1L;
public List<String> CheckoutAxalant(String docCid) 
{
    List<String> fileNames;
    String userId="";

    FVConnectData fvData = new FVConnectData();
    fvData.setWsKeyword("");
    fvData.setWsUrl("");
    FVConnector con = new FVConnector(fvData);

    // get all filenames of document
    try
    {
       fileNames = con.getAllFileNames(docCid, userId);
       for (String value : fileNames)
       {
             System.out.println("filename: " + value);
       }
       return fileNames;
    }
    catch (Exception e)
    {
       System.out.println("ERROR: " + e.getMessage());
       e.printStackTrace();
       return null;
    }


}

錯誤發生在行上：

FVConnectData fvData = new FVConnectData();

完整的堆棧跟蹤如下：

java.lang.NoClassDefFoundError: com/zf/fileviewing/connection/FVConnectData
at com.zf.proceed.service.checkout.CheckOutAxalant.<init>(CheckOutAxalant.java:15)
at com.zf.proceed.gui.ConversionsCreateNewConversion.<init>(ConversionsCreateNewConversion.java:41)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:188)
at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:102)
at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:244)
at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:116)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:72)
at org.apache.el.parser.AstValue.getValue(AstValue.java:161)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
at javax.faces.component.UISelectItems.getValue(UISelectItems.java:129)
at org.primefaces.renderkit.InputRenderer.getSelectItems(InputRenderer.java:53)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeMarkup(SelectOneMenuRenderer.java:71)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:65)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312)
at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:185)
at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:129)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
at org.primefaces.component.wizard.WizardRenderer.encodeCurrentStep(WizardRenderer.java:174)
at org.primefaces.component.wizard.WizardRenderer.encodeContent(WizardRenderer.java:204)
at org.primefaces.component.wizard.WizardRenderer.encodeMarkup(WizardRenderer.java:159)
at org.primefaces.component.wizard.WizardRenderer.encodeEnd(WizardRenderer.java:62)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1786)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:424)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

由於無法訪問Web服務，我對此非常執着。

僅供參考，如果我運行相同的代碼，但將其改編為普通的Java應用程序，則不會有問題。

Answer 1

這是一個類加載器問題： NoClassDefFoundError: com/zf/fileviewing/connection/FVConnectData 。

您確定所有依賴項都存在於您部署的應用程序中嗎？ 首先看一下FVConnectData中的導入。

編輯：

對於用於Web服務調用的JAR文件，請使用mvn install:install-file目標。 它將把工件安裝在您的本地存儲庫中，並使其對MAven可用。 然后，可以在“ dependencies部分中將其添加到pom.xml中（提供groupdId，artifactId和版本）。

您可以通過調用mvn dependency:tree來驗證它是否已添加到項目的mvn dependency:tree 。

Answer 2

似乎您需要將jar文件移動到客戶端的默認服務器lib目錄中。 對於tomcat，它將是...\\apache-tomcat-7.0.81\\lib

請檢查java.lang.NoClassDefFoundError了解更多詳細信息。