Tomcat embedded + add servlet

Question

Hi,
I need to use Tomcat in an embedded mode. No problem to do this. The only problem is that I want to have a servlet added to the server at startup coding it directly in my start method. I have saw that it is possible with Jetty, is it possible too with Tomcat ?
Thanks.

Answer 1

Hi,
download the Tomcat "Embedded" version at http://tomcat.apache.org/download-55.cgi and try the following code:
import org.apache.catalina.*;
import org.apache.catalina.connector.*;
import org.apache.catalina.realm.*;
import org.apache.catalina.startup.*;
import org.apache.catalina.users.*;
public class EmbeddedTomcat
  // Instance variables:
  private String    name;
  private int       portNumber;
  private Embedded  embedded;
  private Engine    baseEngine;
  private Host      baseHost;
  private Connector httpConnector;
  /** Creates a new instance of EmbeddedTomcat */
  public EmbeddedTomcat(
    String name,
    int    portNumber)
    this.name = name;
    this.portNumber = portNumber;
    init();
  private void init()
    MemoryRealm realm;
    Context     context;
    String      baseEngineName;
    String      hostName;
    embedded = new Embedded();
    // set default logger and realm
       FileLogger fileLog = new FileLogger();
       fileLog.setDirectory(".");
       fileLog.setPrefix(name);
       fileLog.setSuffix(".log");
       fileLog.setTimestamp(true);
       embedded.setLogger(fileLog);
    realm = new MemoryRealm();
    embedded.setRealm(realm);
    // create an Engine
    baseEngine = embedded.createEngine();
    // set Engine properties
    baseEngineName = name + "Engine";
    hostName = name + "Host";
    baseEngine.setName(baseEngineName);
    baseEngine.setDefaultHost(hostName);
    baseHost = embedded.createHost(hostName, "webapps");
    baseEngine.addChild(baseHost);
    // RootContext
    context = addContext("", "ROOT");
    // ManagerContext
    context = addContext("/manager", "manager");
    context.setPrivileged(true);
    // add new Engine to set of Engine for embedded server
    embedded.addEngine(baseEngine);
    // create Connector
    httpConnector = embedded.createConnector((java.net.InetAddress) null,
        portNumber, false);
    // add new Connector to set of Connectors for embedded server, associated
    // with Engine
    embedded.addConnector(httpConnector);
  public void start()
    // start server
    try
      embedded.start();
    catch (org.apache.catalina.LifecycleException ex)
      ex.printStackTrace();
      //fileLog.log("Startup failed");
      //fileLog.log(ex.getMessage());
  public Context addContext(
    String path,
    String docBase)
    Context c;
    c = embedded.createContext(path, docBase);
    baseHost.addChild(c);
    return c;
  public static void main(String[] args)
    new EmbeddedTomcat("test", 8080).start();
}Let me know if you have any problems.
/klejs