【发布时间】：2014-11-25 17:04:38
【问题描述】：
我正在编写一个简单的类来发送电子邮件，因此需要外部 JAR。我所做的是在 Eclipse 项目中添加了外部 JARS。这是工作。
但是当我从命令行调用该类时，它会给出 NoClassDefFoundError:javax.mail.Address。这里有两件事，我已经复制了 Java Lib 文件夹中的所有 JAR，第二是 javax.mail.Address 没有在代码中直接引用。知道发生了什么问题或如何解决它。
该类有一个主要功能，无需电子邮件代码即可正常工作。
附言
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Enumeration;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class EmailNotifications {
protected static String message_loseEvent ;
protected static Properties properties;
protected static Connection connection;
protected static Session session;
public static void main(String [] args)throws Exception
{
loadPropertiesFromXML("applicatiosnSettings.xml");
setupMailServer();
_openDBConnection();
ResultSet R = _executeQuery( getQuery("TodaysLossEventQuery") );
while(R.next()) {
message_loseEvent = "<table border=1 ><tr><td>Name</td><td>Description</td><td>URL</td></tr><tr><td>" + R.getString( R.findColumn("Name") ) + "</td><td>" + R.getString( R.findColumn("Description") ) + "</td><td><a href='" + R.getString( R.findColumn("DetailURL") ) + "'>See on OpenPages</a></td></tr></table>";
}
Email("openpages@fvb.com","subject","content");
connection.close();
}
protected static Properties loadPropertiesFromXML(String filePath)
{
try
{
File file = new File(filePath);
FileInputStream fileInput = new FileInputStream(file);
properties = new Properties();
properties.loadFromXML(fileInput);
fileInput.close();
return properties;
}catch (Exception e)
{
e.printStackTrace();
}
return null;
}
protected static String _getProperty(String key)
{
Enumeration enuKeys = properties.keys();
while (enuKeys.hasMoreElements()) {
String _key = (String) enuKeys.nextElement();
if(_key.equals(key))
{
// System.out.println( " _getProperty() > " + properties.getProperty(key));
return properties.getProperty(key);
}
}
return null;
}
protected static void _openDBConnection()
throws ClassNotFoundException, SQLException, IOException
{
//working Drivers
Class.forName ( "COM.ibm.db2os390.sqlj.jdbc.DB2SQLJDriver" );
//Class. forName ( "com.ibm.db2.jcc.DB2Driver" );
String db_host = _getProperty("db_host");
String db_port = _getProperty("db_port");
String db_name = _getProperty("db_name");
String db_user = _getProperty("db_username");
String db_password = _getProperty("db_password");
connection = DriverManager.getConnection("jdbc:db2://"+db_host+":"+db_port+"/"+db_name,db_user,db_password);
//System.out.println( "> DataBase connection obtained " );
}
protected static String getQuery(String queryTitle)
{
return _getProperty(queryTitle);
}
//SELECT OPAGES.RT_LossEvent.LOSSEVENT_ID as LossEventId,OPAGES.RT_LossEvent.NAME00 as Name,OPAGES.RT_LossEvent.DESCRIPTION as Description,OPAGES.ACTORINFO.EMAIL as EmailAddress, OPAGES.RT_LossEvent.DETAIL_PAGE_URL as DetailURL FROM OPAGES.RT_LossEvent JOIN OPAGES.ACTORINFO ON (OPAGES.ACTORINFO.NAME = OPAGES.RT_LossEvent.OWNER AND CONCAT(CONCAT(Year(current date),'-'),CONCAT(Month(current date),CONCAT('-',Day(current date)))) = CONCAT(CONCAT(Year(OPAGES.RT_LossEvent.Creation_Date),'-'),CONCAT(Month(OPAGES.RT_LossEvent.Creation_Date),CONCAT('-',Day(OPAGES.RT_LossEvent.Creation_Date)))))
//ResultSet R
protected static ResultSet _executeQuery(String _query)
throws ClassNotFoundException, SQLException, IOException {
//System.out.println(_query);
Statement s = connection.createStatement();
return s.executeQuery(_query);
//while(R.next()) {
// message_loseEvent = "<table border=1 ><tr><td>Name</td><td>Description</td><td>URL</td></tr><tr><td>" + R.getString( R.findColumn("Name") ) + "</td><td>" + R.getString( R.findColumn("Description") ) + "</td><td><a href='" + R.getString( R.findColumn("DetailURL") ) + "'>See on OpenPages</a></td></tr></table>";
//}
}
protected static void setupMailServer()
{
// Recipient's email ID needs to be mentioned.
String to = _getProperty("from_address");
// Sender's email ID needs to be mentioned
String from = _getProperty("from_address");
// Assuming you are sending email from localhost
String host = _getProperty("email_host");
// Get system properties
Properties properties = System.getProperties();
// Setup mail server
properties.setProperty( _getProperty("email_server") , host);
// Get the default Session object.
session = Session.getDefaultInstance(properties);
}
protected static void Email(String _toAddress,String _subject,String _content)
{
try
{
// Create a default MimeMessage object.
MimeMessage message = new MimeMessage(session);
// Set From: header field of the header.
message.setFrom(new InternetAddress( _getProperty("from_address") ));
// Set To: header field of the header.
message.addRecipient(Message.RecipientType.TO,new InternetAddress(_toAddress));
// Set Subject: header field
message.setSubject(_subject);
// Send the actual HTML message, as big as you like
message.setContent(message_loseEvent,"text/html" );
// Send message
Transport.send(message);
//System.out.println("> Sent message successfully");
}catch (MessagingException mex)
{
mex.printStackTrace();
}
}
}
【问题讨论】：
-
你能发布一些代码吗？
-
当您尝试使用命令行编译代码时，您是否包含这些 jar 文件？
-
我不用命令行编译，eclipse做编译，我只是通过命令行运行\调用类
标签： java eclipse noclassdeffounderror javax.mail.address