java - ClassNotFoundException 打击 XMPPConnection

Question

我按照此文档来实现 gcm 上游消息。

到目前为止，我已经创建了一个 servlet，并从该 servlet 调用 SmackCcsClient。

    ConnectionConfiguration config =
            new ConnectionConfiguration(GCM_SERVER, GCM_PORT);
    config.setSecurityMode(SecurityMode.enabled);
    config.setReconnectionAllowed(true);
    config.setRosterLoadedAtLogin(false);
    config.setSendPresence(false);
    config.setSocketFactory(SSLSocketFactory.getDefault());

    connection = new XMPPTCPConnection(config);
    connection.connect();

    connection.addConnectionListener(new LoggingConnectionListener());

    // Handle incoming packets
    connection.addPacketListener(new PacketListener() {

        @Override
        public void processPacket(Packet packet) {
            logger.log(Level.INFO, "Received: " + packet.toXML());
            Message incomingMessage = (Message) packet;
            GcmPacketExtension gcmPacket =
                    (GcmPacketExtension) incomingMessage.
                    getExtension(GCM_NAMESPACE);
            String json = gcmPacket.getJson();
            try {
                @SuppressWarnings("unchecked")
                Map<String, Object> jsonObject =
                        (Map<String, Object>) JSONValue.
                        parseWithException(json);

                // present for "ack"/"nack", null otherwise
                Object messageType = jsonObject.get("message_type");

                if (messageType == null) {
                    // Normal upstream data message
                    handleUpstreamMessage(jsonObject);

                    // Send ACK to CCS
                    String messageId = (String) jsonObject.get("message_id");
                    String from = (String) jsonObject.get("from");
                    String ack = createJsonAck(from, messageId);
                    send(ack);
                } else if ("ack".equals(messageType.toString())) {
                      // Process Ack
                      handleAckReceipt(jsonObject);
                } else if ("nack".equals(messageType.toString())) {
                      // Process Nack
                      handleNackReceipt(jsonObject);
                } else if ("control".equals(messageType.toString())) {
                      // Process control message
                      handleControlMessage(jsonObject);
                } else {
                      logger.log(Level.WARNING,
                              "Unrecognized message type (%s)",
                              messageType.toString());
                }
            } catch (ParseException e) {
                logger.log(Level.SEVERE, "Error parsing JSON " + json, e);
            } catch (Exception e) {
                logger.log(Level.SEVERE, "Failed to process packet", e);
            }
        }
    }, new PacketTypeFilter(Message.class));

    // Log all outgoing packets
    connection.addPacketInterceptor(new PacketInterceptor() {
        @Override
            public void interceptPacket(Packet packet) {
                logger.log(Level.INFO, "Sent: {0}", packet.toXML());
            }
        }, new PacketTypeFilter(Message.class));

    connection.login(senderId + "@gcm.googleapis.com", apiKey);

它的编译，我没有收到任何错误，因为我已经包含了 smack 4.0.7 库。但是在执行时，我总是收到以下错误: java.lang.ClassNotFoundException:org.jivesoftware.smack.XMPPConnection

jar 已添加到构建路径中。

Answer 1

smack.jar 包含该类。下载并将其添加到您的类路径中。