What kind of file does the following code expect? Why is it breaking?
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Code:
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import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.naming.*;
import javax.naming.directory.*;
import javax.swing.*;
/**
This program demonstrates access to a hierarchical database through LDAP
*/
public class LDAPTest
{
public static void main(String[] args)
{
JFrame frame = new LDAPFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
/**
The frame that holds the data panel and the navigation buttons.
*/
class LDAPFrame extends JFrame
{
public LDAPFrame()
{
setTitle("LDAPTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
JPanel northPanel = new JPanel();
northPanel.setLayout(new java.awt.GridLayout(1, 2, 3, 1));
northPanel.add(new JLabel("uid", SwingConstants.RIGHT));
uidField = new JTextField();
northPanel.add(uidField);
add(northPanel, BorderLayout.NORTH);
JPanel buttonPanel = new JPanel();
add(buttonPanel, BorderLayout.SOUTH);
findButton = new JButton("Find");
findButton.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
findEntry();
}
});
buttonPanel.add(findButton);
saveButton = new JButton("Save");
saveButton.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
saveEntry();
}
});
buttonPanel.add(saveButton);
deleteButton = new JButton("Delete");
deleteButton.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
deleteEntry();
}
});
buttonPanel.add(deleteButton);
addWindowListener(new
WindowAdapter()
{
public void windowClosing(WindowEvent event)
{
try
{
if (context != null) context.close();
}
catch (NamingException e)
{
e.printStackTrace();
}
}
});
}
/**
Finds the entry for the uid in the text field.
*/
public void findEntry()
{
try
{
if (scrollPane != null) remove(scrollPane);
String dn = "uid=" + uidField.getText() + ",ou=people,dc=mycompany,dc=com";
if (context == null) context = getContext();
attrs = context.getAttributes(dn);
dataPanel = new DataPanel(attrs);
scrollPane = new JScrollPane(dataPanel);
add(scrollPane, BorderLayout.CENTER);
validate();
uid = uidField.getText();
}
catch (NamingException e)
{
JOptionPane.showMessageDialog(this, e);
}
catch (IOException e)
{
JOptionPane.showMessageDialog(this, e);
}
}
/**
Saves the changes that the user made.
*/
public void saveEntry()
{
try
{
if (dataPanel == null) return;
if (context == null) context = getContext();
if (uidField.getText().equals(uid)) // update existing entry
{
String dn = "uid=" + uidField.getText() + ",ou=people,dc=mycompany,dc=com";
Attributes editedAttrs = dataPanel.getEditedAttributes();
NamingEnumeration<? extends Attribute> attrEnum = attrs.getAll();
while (attrEnum.hasMore())
{
Attribute attr = attrEnum.next();
String id = attr.getID();
Object value = attr.get();
Attribute editedAttr = editedAttrs.get(id);
if (editedAttr != null && !attr.get().equals(editedAttr.get()))
context.modifyAttributes(dn, DirContext.REPLACE_ATTRIBUTE,
new BasicAttributes(id, editedAttr.get()));
}
}
else // create new entry
{
String dn = "uid=" + uidField.getText() + ",ou=people,dc=mycompany,dc=com";
attrs = dataPanel.getEditedAttributes();
Attribute objclass = new BasicAttribute("objectClass");
objclass.add("uidObject");
objclass.add("person");
attrs.put(objclass);
attrs.put("uid", uidField.getText());
context.createSubcontext(dn, attrs);
}
findEntry();
}
catch (NamingException e)
{
JOptionPane.showMessageDialog(LDAPFrame.this, e);
e.printStackTrace();
}
catch (IOException e)
{
JOptionPane.showMessageDialog(LDAPFrame.this, e);
e.printStackTrace();
}
}
/**
Deletes the entry for the uid in the text field.
*/
public void deleteEntry()
{
try
{
String dn = "uid=" + uidField.getText() + ",ou=people,dc=mycompany,dc=com";
if (context == null) context = getContext();
context.destroySubcontext(dn);
uidField.setText("");
remove(scrollPane);
scrollPane = null;
repaint();
}
catch (NamingException e)
{
JOptionPane.showMessageDialog(LDAPFrame.this, e);
e.printStackTrace();
}
catch (IOException e)
{
JOptionPane.showMessageDialog(LDAPFrame.this, e);
e.printStackTrace();
}
}
/**
Gets a context from the properties specified in the file ldapserver.properties
@return the directory context
*/
public static DirContext getContext()
throws NamingException, IOException
{
Properties props = new Properties();
FileInputStream in = new FileInputStream("ldapserver.properties");
props.load(in);
in.close();
String url = props.getProperty("ldap.url");
String username = props.getProperty("ldap.username");
String password = props.getProperty("ldap.password");
Hashtable<String, String> env = new Hashtable<String, String>();
env.put(Context.SECURITY_PRINCIPAL, username);
env.put(Context.SECURITY_CREDENTIALS, password);
DirContext initial = new InitialDirContext(env);
DirContext context = (DirContext) initial.lookup(url);
return context;
}
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEIGHT = 200;
private JButton findButton;
private JButton saveButton;
private JButton deleteButton;
private JTextField uidField;
private DataPanel dataPanel;
private Component scrollPane;
private DirContext context;
private String uid;
private Attributes attrs;
}
/**
This panel displays the contents of a result set.
*/
class DataPanel extends JPanel
{
/**
Constructs the data panel.
@param attributes the attributes of the given entry
*/
public DataPanel(Attributes attrs) throws NamingException
{
setLayout(new java.awt.GridLayout(0, 2, 3, 1));
NamingEnumeration<? extends Attribute> attrEnum = attrs.getAll();
while (attrEnum.hasMore())
{
Attribute attr = attrEnum.next();
String id = attr.getID();
NamingEnumeration<?> valueEnum = attr.getAll();
while (valueEnum.hasMore())
{
Object value = valueEnum.next();
if (id.equals("userPassword"))
value = new String((byte[]) value);
JLabel idLabel = new JLabel(id, SwingConstants.RIGHT);
JTextField valueField = new JTextField("" + value);
if (id.equals("objectClass"))
valueField.setEditable(false);
if (!id.equals("uid"))
{
add(idLabel);
add(valueField);
}
}
}
}
public Attributes getEditedAttributes()
{
Attributes attrs = new BasicAttributes();
for (int i = 0; i < getComponentCount(); i += 2)
{
JLabel idLabel = (JLabel) getComponent(i);
JTextField valueField = (JTextField) getComponent(i + 1);
String id = idLabel.getText();
String value = valueField.getText();
if (id.equals("userPassword"))
attrs.put("userPassword", value.getBytes());
else if (!id.equals("") && !id.equals("objectClass"))
attrs.put(id, value);
}
return attrs;
}
} |
Error
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:394)
at LDAPFrame.getContext(LDAPTest.java:215)
at LDAPFrame.findEntry(LDAPTest.java:102)
at LDAPFrame$1.actionPerformed(LDAPTest.java:49)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:19
95)
at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.jav
a:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel
.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:242
)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonL
istener.java:236)
at java.awt.Component.processMouseEvent(Component.jav a:6216)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3265)
at java.awt.Component.processEvent(Component.java:598 1)
at java.awt.Container.processEvent(Container.java:204 1)
at java.awt.Component.dispatchEventImpl(Component.jav a:4583)
at java.awt.Container.dispatchEventImpl(Container.jav a:2099)
at java.awt.Component.dispatchEvent(Component.java:44 13)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4556
)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:4220)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:4150)
at java.awt.Container.dispatchEventImpl(Container.jav a:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2475 )
at java.awt.Component.dispatchEvent(Component.java:44 13)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 599)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThre
ad.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.
java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThre
ad.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:122)
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Code:
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ldapserver.properties (originally named sample.ldif; then renamed it)
# Define top-level entry
dn: dc=mycompany,dc=com
objectClass: dcObject
objectClass: organization
dc: mycompany
o: Core Java Team
# Define an entry to contain people
# searches for users are based on this entry
dn: ou=people,dc=mycompany,dc=com
objectClass: organizationalUnit
ou: people
# Define a user entry for John Q. Public
dn: uid=jqpublic,ou=people,dc=mycompany,dc=com
objectClass: person
objectClass: uidObject
uid: jqpublic
sn: Public
cn: John Q. Public
telephoneNumber: +1 408 555 0017
userPassword: wombat
# Define a user entry for Jane Doe
dn: uid=jdoe,ou=people,dc=mycompany,dc=com
objectClass: person
objectClass: uidObject
uid: jdoe
sn: Doe
cn: Jane Doe
telephoneNumber: +1 408 555 0029
userPassword: heffalump
# Define an entry to contain LDAP groups
# searches for roles are based on this entry
dn: ou=groups,dc=mycompany,dc=com
objectClass: organizationalUnit
ou: groups
# Define an entry for the "techstaff" group
dn: cn=techstaff,ou=groups,dc=mycompany,dc=com
objectClass: groupOfUniqueNames
cn: techstaff
uniqueMember: uid=jdoe,ou=people,dc=mycompany,dc=com
# Define an entry for the "staff" group
dn: cn=staff,ou=groups,dc=mycompany,dc=com
objectClass: groupOfUniqueNames
cn: staff
uniqueMember: uid=jqpublic,ou=people,dc=mycompany,dc=com
uniqueMember: uid=jdoe,ou=people,dc=mycompany,dc=com |
[newbie] java.lang.NullPointerException
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