Question

由于我之前提出的问题，我按照以下步骤将Apache PDFbox包含在maven：

中

从download site of PDFbox下载.jars（所有子项目的图书馆下）
从maven repository（公共日志和字体框，但字体框已包含在步骤1中）从PDFbox的依赖项下载.jars
将下载的.jars放入文件夹（C:\PDFjars）
在eclispe中配置了构建路径（将所有.jars添加为外部库）现在看起来像这样：

我的servlet：

package servlets;
// other imports    
import org.apache.pdfbox.pdmodel.PDDocument;

@WebServlet("/print")
public class PrintServlet extends HttpServlet {
    public PrintServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // From a PDFbox Tutorial

        //Creating PDF document object 
          PDDocument document = new PDDocument();    

          //Saving the document
          document.save("C:/PdfBox_Examples/my_doc.pdf");

          System.out.println("PDF created");  

          //Closing the document  
          document.close();

        doGet(request, response);
    }

}

因此，当我启动我的Web项目并调用该函数时，应生成一个简单的PDF文档，我得到了以下错误：

    Servlet.service() for servlet [servlets.PrintServlet] in context with path [/StaticsCalculator] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: org.apache.pdfbox.pdmodel.PDDocument
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1291)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
    at servlets.PrintServlet.doPost(PrintServlet.java:44)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)

解决方案：我也必须复制WEB-INF/lib文件夹中的.jars。

Answer 1

你可以 a）使用本地maven存储库并将依赖项放在那里。 b）在应用程序的类路径中添加依赖项 - 这基本上就是maven为你所做的。

Answer 2

单独下载jar文件并将其添加到您的代码依赖项中。您可以在Maven Repository上搜索任何Maven文件。如果您正在使用Eclipse，只需修改构建路径以指向外部jar并为其指定jar的位置。这将不处理您的库所需的任何依赖项，这将导致依赖性地狱，您必须手动读取pom并下载每个库。

ClassNotFoundException - 如何使用没有maven的外部库？

2 个答案: