Java Webserver - Tomcat / Axis2 - Response time very slow!!

Question

Hi all,
I'm developing a Java Web Server using Axis2 inside Tomcat 7, but i'm having a big problem with the response time for each request made.
The purpose of this application is to fetch data from a database and return it to a client (also developed in Java)
For example: If i make a request from the database for 4000 objects, the database returns the data rather quickly (about 100ms), but then it takes about 30 seconds to generate the soap response, the xml containing the response has about 3mb size. The class in the webservice that represents the information from the database is quite simple, it has a string array, and about 3 Integers and 2 Strings..
Is this normal for the response time? Is there any way to optimize (Tomcat definition, etc)?
Thanks in advance :)

Answer 1

Here's a method from the webserver that returns the information from the database:
* The method receives a SQL Query to execute, and return a list with all the objects from the database
public MyObject[] getMyObject(String querySQL) throws SQLException, ConfigurationException, AxisFault  {
     try {
          ArrayList<MyObject> myObjectList = new ArrayList<MyObject>();
          //Executes the query on the database
          Statement stmt = RdbmsDAOFactory.connection.createStatement();
          ResultSet rs = stmt.executeQuery(querySQL.toString());
          //Fetching the results
          while (rs.next()) {
               List<AttributesFromMyObject> attributeList = new ArrayList<AttributesFromMyObject>();
               int columnCount = rs.getMetaData().getColumnCount();
               for(int i = 1; i <= columnCount; i++){
                    //This class saves the column name/value for each object from the database
                    AttributesFromMyObject attribute = new AttributesFromMyObject();
                    attribute.setName(rs.getMetaData().getColumnName(i));
                    attribute.setValue(rs.getString(i));
                    attributeList.add(attribute);
               //Creates the object and saves the corresponding attributes list
               MyObject r = new MyObject();
               r.setAttributeValues((AttributeValue[])attributeList.toArray(new AttributeValue[0]));
               //Add each object to the arraylist that will be returned at the end
               myObjectList.add(r);
          //UNTILL HERE IT TAKES ABOUT 125 ms
          return (MyObject[])myObjectList.toArray(new MyObject[0]);
     } catch (Exception e) {
          throw new AxisFault ("Unknown error: " + e.getMessage() + " - " + e.getStackTrace());
}And here's a method from the client that saves the resuts from the Web Server
* The method sends a query sql to the Web Server and save the results
public void getMyObject(){
     //This is from a library that i'm using to generate SQL
     Table dbTable = new Table(tableName);
     select = new SelectQuery(dbTable);
     select.addColumn(dbTable, "*");
     select.addCriteria(new InCriteria(new Column(dbTable, "[idObject]"), ids));
     //Create request object to the Web Server
     GetMyObject getMyObject = new GetMyObject();
     getMyObject.setQuerySQL(select.toString());
     //FROM HERE
     MyObject[] rList = this.webService.getMyObject(getMyObject).get_return(); //Response from the Web Server
     //TO HERE -> IT TAKES ABOUT 36 seconds IF I'M GETTING THE 4000 OBJECTS
}And here's a bit of the soap response that i'm getting (from a total of 82600 lines generated):
<?xml version="1.0" encoding="utf-8"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
  <soapenv:Body>
    <ns:getMyObjectResponse xmlns:ns="http://xx.xxx.xxx.com" xmlns:ax21="http://xx.xxx.xxx.com/xsd"
xmlns:ax27="http://exception.lang.commons.apache.org/xsd" xmlns:ax26="http://configuration.commons.apache.org/xsd" xmlns:ax23="http://sql.java/xsd">
      <ns:return xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ax21:MyObject">
        <ax21:attributeValues xsi:type="ax21:AttributeValue">
          <ax21:name>idMyObject</ax21:name>
          <ax21:value>2290</ax21:value>
        </ax21:attributeValues>
        <ax21:attributeValues xsi:type="ax21:AttributeValue">
          <ax21:name>Calldate</ax21:name>
          <ax21:value>2003-12-22 00:00:00.000</ax21:value>
        </ax21:attributeValues>
        <ax21:attributeValues xsi:type="ax21:AttributeValue">
          <ax21:name>Call_duration</ax21:name>
          <ax21:value>10</ax21:value>
        </ax21:attributeValues>
        <ax21:attributeValues xsi:type="ax21:AttributeValue">
          <ax21:name>Gross_amnt</ax21:name>
          <ax21:value>2.1000000000000001</ax21:value>
        </ax21:attributeValues>
        <ax21:id>0</ax21:id>
        <ax21:idSourceEntity>0</ax21:idSourceEntity>
        <ax21:idTargetEntity>0</ax21:idTargetEntity>
        <ax21:subtype xsi:nil="true" />
        <ax21:type xsi:nil="true" />
      </ns:return>
    </ns:getMyObjectResponse>
  </soapenv:Body>
</soapenv:Envelope>Thanks!
Edited by: user9257993 on 19/Abr/2011 2:46