JavaMail Session cannot be resolved to a type

Basically I'm working with the following code in Eclipse:

<%@ page import="java.util.*" %>
<%@ page import="javax.mail.*" %>
<%@ page import="javax.mail.internet.*" %>
<%@ page import="javax.activation.*" %>
<%@ page import="java.sql.*,java.util.*,java.text.*,java.text.SimpleDateFormat" %>
<%
String host = "mail.outdorsrealm.net";
String to = request.getParameter("lEmail");
String from = "Tibco2@outdorsrealm.net";
String subject = request.getParameter("Forgot Email");
String messageText = "";
boolean sessionDebug = false;
// Create some properties and get the default Session.
Properties props = System.getProperties();
props.put("mail.host", host);
props.put("mail.transport.protocol", "smtp");
Session mailSession = Session.getDefaultInstance(props, null);

// Set debug on the Session
// Passing false will not echo debug info, and passing True will.
 
mailSession.setDebug(sessionDebug);
 
// Instantiate a new MimeMessage and fill it with the
// required information.
 
Message msg = new MimeMessage(mailSession);
msg.setFrom(new InternetAddress(from));
InternetAddress[] address = {new InternetAddress(to)};
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(subject);
msg.setSentDate(new java.util.Date());

System.out.println("Connecting to Oracle.");
Connection conn = null;
String url = "jdbc:oracle:thin://localhost:1521/";
String dbName = "XE";
String driver ="oracle.jdbc.driver.OracleDriver";
String username = "TestProject"; 
String userPassword = "jsrig88";
boolean invalid = false;

try {  
  Class.forName(driver).newInstance();
  
  conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:xe",username,userPassword);

Statement st = conn.createStatement();
  
  ResultSet rs = st.executeQuery("SELECT username, password FROM Users WHERE email = '" + to + "'");
  if (rs.next()) {
	  messageText = "Your username is " + rs.getString(1) + ", and your password is " + rs.getString(2) + ".";
  }
  else {
	  rs = st.executeQuery("SELECT username, password FROM TempUsers WHERE email = '" + to + "'");
	  if (rs.next()) {
		  messageText = "Your username is " + rs.getString(1) + ", and your password is " + rs.getString(2) + ".";
	  }
	  else {
		  invalid = true;
	  }
  }
} catch (Exception e) {
	  System.out.print(e);
}

if (invalid) {
	response.sendRedirect("loginPage.html");
}
else {
msg.setText(messageText);
 
// Hand the message to the default transport service
// for delivery.
 
Transport.send(msg);
out.println("Mail was sent to " + to);
out.println(" from " + from);
out.println(" using host " + host + ".");
}
%>

The classpath appears to be fine, and I get no errors in the code. However once try to run that code in Eclipse's internal browser, I get error messages like this:

Eclipse is configured to spot errors immediately, and if I comment out the imports, then I see errors on the lines like #17. When I de-comment the imports, all the errors magically go away, which tells me that to some extent, Eclipse is reading the jar file and importing everything. What's the deal?

Suggestions:

#1: Java code doesn't belong in a JSP. Put this logic into a servlet where you have full control over the imports.
#2: Try it specifying the full class name: javax.mail.Session. It is possible there is another class "Session" being imported from a different package
#3: Watch out for SQL Injection. Use a prepared statement rather than building up a sql string via concatenation.

I forgot I had made this thread. Anyway coming back to it a while after I submitted the initial query, I'm gonna state what had gone wrong. Basically in Eclipse, even if you've got your path/classpath variables all set correctly, a dynamic web project won't work unless you put non-standard jars like the one I was trying to use in <project name>\WebContent\WEB-INF\lib. Earlier I just had the jar somewhere else on my computer, but even setting the path/classpath variables properly, it wouldn't work; you just have to put those things into that specific folder for some reason.