Question

我正在使用Guava 14.0 jar，以下是我的代码

package org.user.module.test;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.concurrent.TimeUnit;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.Cache;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class test
 */
@WebServlet("/test")
public class test extends HttpServlet  {
    private static final long serialVersionUID = 1L;

    Cache<String, Integer> map;

    public test() {
        super();
        // TODO Auto-generated constructor stub
    }

    public void init() throws ServletException
    {
        map=CacheBuilder.newBuilder().
                maximumSize(100).
                expireAfterAccess(10, TimeUnit.MINUTES).
                build();

    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out=response.getWriter();
        String p=request.getParameter("v");
        Integer a=map.getIfPresent(p);
        if(a==null){
            map.put(p, 1);
            out.println("Putting The Integer:"+a);
        }
        else{
            map.put(p,a++);
            out.println("A is already present and the value is:"+a);
        }

    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request,response);
    }

}

错误：

SEVERE：为servlet org.user.module.test.test分配异常 java.lang.ClassNotFoundException：com.google.common.cache.Cache at org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1701）在 org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1546） at java.lang.Class.getDeclaredFields0（Native Method）at java.lang.Class.privateGetDeclaredFields（Class.java:2317）at at java.lang.Class.getDeclaredFields（Class.java:1762）at org.apache.catalina.core.DefaultInstanceManager.populateAnnotationsCache（DefaultInstanceManager.java:276）在 org.apache.catalina.core.DefaultInstanceManager.newInstance（DefaultInstanceManager.java:143）在 org.apache.catalina.core.DefaultInstanceManager.newInstance（DefaultInstanceManager.java:125）在 org.apache.catalina.core.StandardWrapper.loadServlet（StandardWrapper.java:1136）在 org.apache.catalina.core.StandardWrapper.allocate（StandardWrapper.java:857）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:135）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:169）在 org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472）在 org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:168）在 org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:98）在 org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:927）在 org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:118）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407）在 org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:987）在 org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:579）在 org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:307）在 java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1145）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:615）在java.lang.Thread.run（Thread.java:722）

从这里下载jar Downlaod Link 链接到我的项目文件夹（项目名称：test2）LINK

Answer 1

明显的答案是; 从应用程序服务器指定的类路径中找不到Google番石榴罐。 jar应该出现在 WEB-INF / classes 或 WEB-INF / lib 中。 Apache Tomcat还从 $ CATALINA_HOME / lib 文件夹加载公共类。

com.google.common.cache.Cache类未找到错误

1 个答案: