title: Prohibited package name: java
body: <p>I tried to get the data from my database name as jaane with user name Hello and Password hello.
  Error:</p>
  
  <pre><code>java.lang.SecurityException: Prohibited package name: java
          at java.lang.ClassLoader.preDefineClass(ClassLoader.java:480)
          at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
          at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
          at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
          at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
          at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
          at java.security.AccessController.doPrivileged(Native Method)
          at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
          at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
          at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
  Could not find the main class: java.Main.  Program will exit.
  Exception in thread "main" Java Result: 1
  BUILD SUCCESSFUL (total time: 0 seconds)
  </code></pre>
  
  <p>my code is </p>
  
  <pre><code>package java;
  
  import java.awt.Container;
  import java.sql.DriverManager;
  import java.sql.Connection;
  import java.sql.ResultSet;
  import java.sql.ResultSetMetaData;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import javax.swing.JFrame;
  import javax.swing.JScrollPane;
  import javax.swing.JTextArea;
  
  /**
   *
   * @author ritesh
   */
  public class Main extends JFrame{
  
  
      public Main() throws SQLException
      {super("Database of Students");
          try {
              Class.forName("org.apache.derby.jdbc.ClientDriver");
          } catch (ClassNotFoundException ex) {
              Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
  
          }
       Connection connection = DriverManager.getConnection( "jdbc:derby:/localhost:1527","hello","Hello" );
       Statement statement = connection.createStatement();
  
  
   // query database
         ResultSet resultSet =
   statement.executeQuery( "SELECT * FROM COLLEAGUES" );
         StringBuffer results = new StringBuffer();
   ResultSetMetaData metaData = resultSet.getMetaData();
   int numberOfColumns = metaData.getColumnCount();
  
   for ( int i = 1; i &lt;= numberOfColumns; i++ ) {
   results.append( metaData.getColumnName( i ) + "\t" );
   }
  
   results.append( "\n" );
  
   while ( resultSet.next() ) {
  
   for ( int i = 1; i &lt;= numberOfColumns; i++ ) {
   results.append( resultSet.getObject( i ) + "\t" );
   }
  
  
   }
  
   // close statement and connection
   statement.close();
   connection.close();
  
  // set up GUI and display window
  JTextArea textArea = new JTextArea( "Hello");
   Container container = getContentPane();
  
   container.add( new JScrollPane( textArea ) );
  
   setSize( 300, 100 ); // set window size
   setVisible( true ); // display window
  }
  
      /**
       * @param args the command line arguments
       */
      public static void main(String[] args) {
          try {
              Main window = new Main();
              window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              // TODO code application logic here
          } catch (SQLException ex) {
              Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
          }
      }
  
  }
  </code></pre>