Question

我正在创建一个简单的Web应用程序，并决定使用Spring JdbcTemplate类。但现在我遇到了NoClassDefFoundError：org / springframework / jdbc / core / RowMapper。

根据堆栈跟踪，第32行的ControllerServlet出现问题。这是：

collection = ET.fromstring(input)
lst = collection.findall('movie')
print ('Movie count:', len(lst))
for item in lst:
   print ('Movie Title', item.get("title"))

   movieTypes = item.findall('type')
   for movieType in movieTypes:
       print ('Type', movieType.text)
   print ('Format', item.find('format').text)
   print ('Year',item.find('year').text)
   print ""

错误可能是什么原因？我该怎么做才能解决它？

productDAOImpl = new ProductDAOImpl(dataSource);

ControllerServlet.java

Context Path:/webstore_war_exploded
Servlet Path:/ControllerServlet
Path Info:null
Query String:null
Stack Trace
java.lang.NoClassDefFoundError: org/springframework/jdbc/core/RowMapper
com.ncproject.webstore.controller.ControllerServlet.init(ControllerServlet.java:32)
javax.servlet.GenericServlet.init(GenericServlet.java:244)
io.undertow.servlet.core.LifecyleInterceptorInvocation.proceed(LifecyleInterceptorInvocation.java:117)
org.wildfly.extension.undertow.security.RunAsLifecycleInterceptor.init(RunAsLifecycleInterceptor.java:78)
io.undertow.servlet.core.LifecyleInterceptorInvocation.proceed(LifecyleInterceptorInvocation.java:103)
io.undertow.servlet.core.ManagedServlet$DefaultInstanceStrategy.start(ManagedServlet.java:250)
io.undertow.servlet.core.ManagedServlet.getServlet(ManagedServlet.java:171)
io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:84)
io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)

ProductDAOImpl.java

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

private ProductDAOImpl productDAOImpl;

@Resource(lookup = "java:/PostgresNC")
private DataSource dataSource;


@Override
public void init() throws ServletException {
    super.init();
    try {
        productDAOImpl = new ProductDAOImpl(dataSource);
    } catch (Exception exc) {
        throw new ServletException(exc);
    }
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try {
        String theCommand = request.getParameter("command");

        if (theCommand == null) {
            theCommand = "PRODUCT_LIST";
        }

        switch (theCommand) {
            case "PRODUCT_LIST":
                listProducts(request, response);
                break;
            case "ADD_UPDATE":
                addOrUpdateProduct(request, response);
                break;
            default:
                listProducts(request, response);
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
}

private void listProducts(HttpServletRequest request, HttpServletResponse response) throws Exception {

    List<Product> products = productDAOImpl.getAllProducts();

    request.setAttribute("PRODUCT_LIST", products);

    RequestDispatcher dispatcher = request.getRequestDispatcher("/list-products.jsp");
    dispatcher.forward(request, response);
}

private void addOrUpdateProduct(HttpServletRequest request, HttpServletResponse response) throws Exception {
    // read product from the form
    String idString = request.getParameter("productId");
    String category = request.getParameter("category");
    String description = request.getParameter("description");
    String productName = request.getParameter("productName");
    String price = request.getParameter("price");
    BigDecimal priceBigDecimal = new BigDecimal(price);
    String brand = request.getParameter("brand");

    try {
        int id = Integer.parseInt(idString.trim());
        int numCategory = Integer.parseInt(category);

        if(idString != null && category != null) {

            Product theProduct = new Product(id, numCategory, description, productName, priceBigDecimal, brand);

            // add the product to the database
            productDAOImpl.saveOrUpdate(theProduct);
        }
    }
    catch(NumberFormatException nfe) {
        nfe.printStackTrace();
    }

    listProducts(request, response);
}

Answer 1

所需的JAR文件不可用，因此您需要将其放在CLASSPATH上。您可以选择将相应的JAR文件添加到CLASSPATH，或者作为备用，您可以从here下载JAR文件。

关于同一主题的类似问题，供您参考here和here。

NoClassDefFoundError：org / springframework / jdbc / core / RowMapper

1 个答案: