Here is how the Jozi JUG voted :
Most notably on the open seat side, here are the people who got elected.
London Java Community 164 votes (33%)
CloudBees 101 votes (20%)
Thanks to everyone who made the effort to vote.
More info here.
Wednesday, October 31, 2012
Java Community Process EC Elections 2012
The election results are out!
Here is how the Jozi JUG voted :
Most notably on the open seat side, here are the people who got elected.
London Java Community 164 votes (33%)
CloudBees 101 votes (20%)
Thanks to everyone who made the effort to vote.
More info here.
Here is how the Jozi JUG voted :
Most notably on the open seat side, here are the people who got elected.
London Java Community 164 votes (33%)
CloudBees 101 votes (20%)
Thanks to everyone who made the effort to vote.
More info here.
Thursday, October 11, 2012
Help Getting a GWT error : com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.
GWT can be painful sometimes
I was getting the following error while using GWT 2.4.0, GWT 2.5.0 and 2.5.1[gwt:compile]
auto discovered modules [za.co.enerweb.ies.iesmobile]
Compiling module za.co.enerweb.ies.iesmobile
Validating units:
Ignored 1 unit with compilation errors in first pass.
Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors.
[ERROR] An internal compiler exception occurred
com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.
at com.google.gwt.dev.jjs.ast.JVisitor.translateException(JVisitor.java:109)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:276)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:116)
at com.google.gwt.dev.jjs.ast.JCastOperation.traverse(JCastOperation.java:65)
at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:116)
at com.google.gwt.dev.jjs.ast.JDeclarationStatement.traverse(JDeclarationStatement.java:48)
at com.google.gwt.dev.jjs.ast.JModVisitor$ListContextImmutable.traverse(JModVisitor.java:170)
at com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemoveImmutable(JModVisitor.java:336)
at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:83)
at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:137)
at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:133)
at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:82)
at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:426)
at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:395)
at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)
at com.google.gwt.dev.jjs.impl.UnifyAst.mainLoop(UnifyAst.java:902)
at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:627)
at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:604)
at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:33)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:278)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:229)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:141)
at com.google.gwt.dev.Compiler.run(Compiler.java:232)
at com.google.gwt.dev.Compiler.run(Compiler.java:198)
at com.google.gwt.dev.Compiler$1.run(Compiler.java:170)
at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:88)
at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:82)
at com.google.gwt.dev.Compiler.main(Compiler.java:177)
Caused by: java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
at com.google.gwt.uibinder.rebind.W3cDocumentBuilder.startElement(W3cDocumentBuilder.java:127)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:392)
at com.google.gwt.uibinder.rebind.W3cDomHelper.documentFor(W3cDomHelper.java:74)
at com.google.gwt.uibinder.rebind.UiBinderGenerator.getW3cDoc(UiBinderGenerator.java:204)
at com.google.gwt.uibinder.rebind.UiBinderGenerator.generateOnce(UiBinderGenerator.java:174)
at com.google.gwt.uibinder.rebind.UiBinderGenerator.generate(UiBinderGenerator.java:129)
at com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40)
at com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:657)
at com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:41)
at com.google.gwt.dev.shell.StandardRebindOracle$Rebinder.rebind(StandardRebindOracle.java:79)
at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:276)
at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:265)
at com.google.gwt.dev.DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(DistillerRebindPermutationOracle.java:91)
at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleGwtCreate(UnifyAst.java:355)
at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleMagicMethodCall(UnifyAst.java:433)
at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.endVisit(UnifyAst.java:237)
at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:243)
at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
... 37 more
[ERROR] at MainPage.java(27): GWT.create(MainPage$MainPageUiBinder.class)
com.google.gwt.dev.jjs.ast.JMethodCall
[ERROR] at MainPage.java(27): (MainPage$MainPageUiBinder) GWT.create(MainPage$MainPageUiBinder.class)
com.google.gwt.dev.jjs.ast.JCastOperation
[ERROR] at MainPage.java(27): static MainPage$MainPageUiBinder uiBinder = (MainPage$MainPageUiBinder) GWT.create(MainPage$MainPageUiBinder.class)
com.google.gwt.dev.jjs.ast.JDeclarationStatement
[ERROR] at MainPage.java(23): {
Page.$clinit();
static MainPage$MainPageUiBinder uiBinder = (MainPage$MainPageUiBinder) GWT.create(MainPage$MainPageUiBinder.class);
}
com.google.gwt.dev.jjs.ast.JBlock
[ERROR] at MainPage.java(23): {
Page.$clinit();
static MainPage$MainPageUiBinder uiBinder = (MainPage$MainPageUiBinder) GWT.create(MainPage$MainPageUiBinder.class);
}
com.google.gwt.dev.jjs.ast.JMethodBody
[ERROR] at MainPage.java(23): private static final void $clinit();
com.google.gwt.dev.jjs.ast.JMethod
The UI Binder Java code
public class MainPage extends Page {
@UiField
ListPanel list;
private static MainPageUiBinder uiBinder = GWT.create(MainPageUiBinder.class);
interface MainPageUiBinder extends UiBinder {
}
public MainPage() {
initWidget(uiBinder.createAndBindUi(this));
The solution
There was a very old version old version of xercesImpl 2.6.2 included by Jersey
com.sun.jersey.contribs
jersey-atom-abdera
1.8
So find it and banish it to the place it came from and don't forget to clean package
com.sun.jersey.contribs
jersey-atom-abdera
1.8
xercesImpl
xerces
Friday, August 31, 2012
Et tu, Richard. I stabbed myself in the back with Vaadin and Lombok
The problem I struggled with for days...
Take a simple Vaadin tab sheet.Add a sheet , remove a sheet etc. Nothing hard at all right ?
I was getting the below error when the screen was repainted.
SEVERE: Terminal error: java.lang.NullPointerException at com.vaadin.ui.TabSheet.paintContent(TabSheet.java:390) at com.vaadin.ui.AbstractComponent.paint(AbstractComponent.java:781) at com.vaadin.ui.AbstractSplitPanel.paintContent(AbstractSplitPanel.java:235) at com.vaadin.ui.AbstractComponent.paint(AbstractComponent.java:781) at com.vaadin.ui.AbstractOrderedLayout.paintContent(AbstractOrderedLayout.java:187) at com.vaadin.ui.AbstractComponent.paint(AbstractComponent.java:781) at com.vaadin.ui.Panel.paintContent(Panel.java:269) at com.vaadin.ui.Window.paintContent(Window.java:641) at com.vaadin.ui.AbstractComponent.paint(AbstractComponent.java:781) at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.writeUidlResponce(AbstractCommunicationManager.java:1046) at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.paintAfterVariableChanges(AbstractCommunicationManager.java:927) at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:794) at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:296) at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:501) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:169) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.__invoke(StandardHostValve.java:168) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:964) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:304) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722)
There seems to be a Vaadin ticket for this : http://dev.vaadin.com/ticket/4179
The culprit
My favorite java Add On : LombokActually I can't blame Lombok or Vaadin, this is my misuse of Lombok inside Vaadin
I decorated my component with @Data
That means the equals and hashCode were generated by all the fields in the class.
com.vaadin.ui.TabSheet.java contains an internal representation of the tabs in a HashMap tabs.
If the hashmap can not find your component because the equals has changed. you will get what I did.
Tab tab = tabs.get(component);//will return null
target.startTag("tab");
if (!tab.isEnabled() && tab.isVisible()) {
Monday, August 13, 2012
Expanding on old LDAPManager.java
In 2001 Brett McLaughlin published a small class with no dependencies called LDAPManager.java.
It's Super simple, as apposed to many libraries that try to make it very complex.
I have added three methods :
It's Super simple, as apposed to many libraries that try to make it very complex.
I have added three methods :
// Snip
public List getUsersString() throws NamingException {}
public List getUsers() throws NamingException {}
public List getGroups() throws NamingException {}
// Snip
/*
Copyright (C) 2001 Brett McLaughlin.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the disclaimer that follows
these conditions in the do*****entation and/or other materials
provided with the distribution.
3. The name "Building Java Enterprise Applications" must not be used
to endorse or promote products derived from this software without
prior written permission. For written permission, please contact
brett@newInstance.com.
In addition, we request (but do not require) that you include in the
end-user do*****entation provided with the redistribution and/or in the
software itself an acknowledgement equivalent to the following:
"This product includes software developed for the
'Building Java Enterprise Applications' book, by Brett McLaughlin
(O'Reilly & Associates)."
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Properties;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.naming.Context;
import javax.naming.NameClassPair;
import javax.naming.NameNotFoundException;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.AttributeInUseException;
import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttribute;
import javax.naming.directory.BasicAttributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.ModificationItem;
import javax.naming.directory.NoSuchAttributeException;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
public class LDAPManager {
/**
* The OU (organizational unit) to add users to
*/
private String USERS_OU =
"ou=People,ou=People,dc=example,dc=com";
/**
* The OU (organizational unit) to add groups to
*/
private String GROUPS_OU =
"o=groups,ou=People,dc=example,dc=com";
/**
* The OU (organizational unit) to add permissions to
*/
private String PERMISSIONS_OU =
"ou=Permissions,o=forethought.com";
/**
* The default LDAP port
*/
private static final int DEFAULT_PORT = 389;
/**
* The LDAPManager instance object
*/
private static Map instances = new HashMap();
/**
* The connection, through a
* DirContext, to LDAP
*/
private DirContext context;
/**
* The hostname connected to
*/
private String hostname;
/**
* The port connected to
*/
private int port;
protected LDAPManager(String hostname, int port,
String username, String password,String USERS_OU,String GROUPS_OU,String PERMISSIONS_OU)
throws NamingException {
this.USERS_OU = USERS_OU;
this.GROUPS_OU = GROUPS_OU;
this.PERMISSIONS_OU = PERMISSIONS_OU;
context = getInitialContext(hostname, port, username, password);
// Only save data if we got connected
this.hostname = hostname;
this.port = port;
}
public static LDAPManager getInstance(String hostname,
int port,
String username,
String password,String USERS_OU,String GROUPS_OU,String PERMISSIONS_OU)
throws NamingException {
// Construct the key for the supplied information
String key = new StringBuffer()
.append(hostname)
.append(":")
.append(port)
.append("|")
.append((username == null ? "" : username))
.append("|")
.append((password == null ? "" : password))
.toString();
if (!instances.containsKey(key)) {
synchronized (LDAPManager.class) {
if (!instances.containsKey(key)) {
LDAPManager instance =
new LDAPManager(hostname, port,
username, password,USERS_OU, GROUPS_OU, PERMISSIONS_OU);
instances.put(key, instance);
return instance;
}
}
}
return (LDAPManager) instances.get(key);
}
public static LDAPManager getInstance(String hostname, int port,String USERS_OU,String GROUPS_OU,String PERMISSIONS_OU)
throws NamingException {
return getInstance(hostname, port, null, null,USERS_OU, GROUPS_OU, PERMISSIONS_OU);
}
public static LDAPManager getInstance(String hostname,String USERS_OU,String GROUPS_OU,String PERMISSIONS_OU)
throws NamingException {
return getInstance(hostname, DEFAULT_PORT, null, null,USERS_OU, GROUPS_OU, PERMISSIONS_OU);
}
public void addUser(String username, String firstName,
String lastName, String password)
throws NamingException {
// Create a container set of attributes
Attributes container = new BasicAttributes();
// Create the objectclass to add
Attribute objClasses = new BasicAttribute("objectClass");
objClasses.add("top");
objClasses.add("person");
objClasses.add("organizationalPerson");
objClasses.add("inetOrgPerson");
// Assign the username, first name, and last name
String cnValue = new StringBuffer(firstName)
.append(" ")
.append(lastName)
.toString();
Attribute cn = new BasicAttribute("cn", cnValue);
Attribute givenName = new BasicAttribute("givenName", firstName);
Attribute sn = new BasicAttribute("sn", lastName);
Attribute uid = new BasicAttribute("uid", username);
// Add password
Attribute userPassword =
new BasicAttribute("userpassword", password);
// Add these to the container
container.put(objClasses);
container.put(cn);
container.put(sn);
container.put(givenName);
container.put(uid);
container.put(userPassword);
// Create the entry
context.createSubcontext(getUserDN(username), container);
}
public void deleteUser(String username) throws NamingException {
try {
context.destroySubcontext(getUserDN(username));
} catch (NameNotFoundException e) {
// If the user is not found, ignore the error
}
}
public boolean isValidUser(String username, String password)
throws UserNotFoundException {
try {
DirContext context =
getInitialContext(hostname, port, getUserDN(username),
password);
return true;
} catch (javax.naming.NameNotFoundException e) {
throw new UserNotFoundException(username);
} catch (NamingException e) {
// Any other error indicates couldn't log user in
return false;
}
}
public void addGroup(String name, String description)
throws NamingException {
// Create a container set of attributes
Attributes container = new BasicAttributes();
// Create the objectclass to add
Attribute objClasses = new BasicAttribute("objectClass");
objClasses.add("top");
objClasses.add("groupOfUniqueNames");
objClasses.add("groupOfForethoughtNames");
// Assign the name and description to the group
Attribute cn = new BasicAttribute("cn", name);
Attribute desc = new BasicAttribute("description", description);
// Add these to the container
container.put(objClasses);
container.put(cn);
container.put(desc);
// Create the entry
context.createSubcontext(getGroupDN(name), container);
}
public void deleteGroup(String name) throws NamingException {
try {
context.destroySubcontext(getGroupDN(name));
} catch (NameNotFoundException e) {
// If the group is not found, ignore the error
}
}
public void addPermission(String name, String description)
throws NamingException {
// Create a container set of attributes
Attributes container = new BasicAttributes();
// Create the objectclass to add
Attribute objClasses = new BasicAttribute("objectClass");
objClasses.add("top");
objClasses.add("forethoughtPermission");
// Assign the name and description to the group
Attribute cn = new BasicAttribute("cn", name);
Attribute desc = new BasicAttribute("description", description);
// Add these to the container
container.put(objClasses);
container.put(cn);
container.put(desc);
// Create the entry
context.createSubcontext(getPermissionDN(name), container);
}
public void deletePermission(String name) throws NamingException {
try {
context.destroySubcontext(getPermissionDN(name));
} catch (NameNotFoundException e) {
// If the permission is not found, ignore the error
}
}
public boolean assignUser(String username, String groupName)
throws NamingException {
try {
ModificationItem[] mods = new ModificationItem[1];
Attribute mod =
new BasicAttribute("uniqueMember",
getUserDN(username));
mods[0] =
new ModificationItem(DirContext.ADD_ATTRIBUTE, mod);
context.modifyAttributes(getGroupDN(groupName), mods);
return true;
} catch (AttributeInUseException e) {
// If user is already added, ignore exception
return false;
}
}
public boolean removeUser(String username, String groupName)
throws NamingException {
try {
ModificationItem[] mods = new ModificationItem[1];
Attribute mod =
new BasicAttribute("uniqueMember",
getUserDN(username));
mods[0] =
new ModificationItem(DirContext.REMOVE_ATTRIBUTE, mod);
context.modifyAttributes(getGroupDN(groupName), mods);
return true;
} catch (NoSuchAttributeException e) {
// If user is not assigned, ignore the error
return false;
}
}
public boolean userInGroup(String username, String groupName)
throws NamingException {
// Set up attributes to search for
String[] searchAttributes = new String[1];
searchAttributes[0] = "uniqueMember";
Attributes attributes =
context.getAttributes(getGroupDN(groupName),
searchAttributes);
if (attributes != null) {
Attribute memberAtts = attributes.get("uniqueMember");
if (memberAtts != null) {
for (NamingEnumeration vals = memberAtts.getAll();
vals.hasMoreElements();) {
if (username.equalsIgnoreCase(
getUserUID((String) vals.nextElement()))) {
return true;
}
}
}
}
return false;
}
public List getMembers(String groupName) throws NamingException {
List members = new LinkedList();
// Set up attributes to search for
String[] searchAttributes = new String[1];
searchAttributes[0] = "uniqueMember";
Attributes attributes =
context.getAttributes(getGroupDN(groupName),
searchAttributes);
if (attributes != null) {
Attribute memberAtts = attributes.get("uniqueMember");
if (memberAtts != null) {
for (NamingEnumeration vals = memberAtts.getAll();
vals.hasMoreElements();
members.add(
getUserUID((String) vals.nextElement()))) ;
}
}
return members;
}
public List getGroups(String username) throws NamingException {
List groups = new LinkedList();
// Set up criteria to search on
String filter = new StringBuffer()
.append("(&")
.append("(objectClass=groupOfForethoughtNames)")
.append("(uniqueMember=")
.append(getUserDN(username))
.append(")")
.append(")")
.toString();
// Set up search constraints
SearchControls cons = new SearchControls();
cons.setSearchScope(SearchControls.ONELEVEL_SCOPE);
NamingEnumeration results =
context.search(GROUPS_OU, filter, cons);
while (results.hasMore()) {
SearchResult result = (SearchResult)results.next();
groups.add(getGroupCN(result.getName()));
}
return groups;
}
private NamingEnumeration search(String base) throws NamingException {
SearchControls cons = new SearchControls();
cons.setSearchScope(SearchControls.SUBTREE_SCOPE);
NamingEnumeration results =
context.list(base);
return results;
}
public List getGroups() throws NamingException {
ArrayList result = new ArrayList();
NamingEnumeration items = search(GROUPS_OU);
while (items != null && items.hasMore()) {
NameClassPair ctx = (NameClassPair) items.next();
System.out.println(ctx);
Attributes attrs = context.getAttributes(ctx.getNameInNamespace());
String strippedName = this.getUserUID(ctx.getName());
result.add(strippedName);
}
return result;
}
public List getUsersString() throws NamingException {
List usersString = new ArrayList();
List users = getUsers();
for (User user : users){
usersString.add(user.getStrippedDn());
}
return usersString;
}
public List getUsers() throws NamingException {
ArrayList result = new ArrayList();
NamingEnumeration items = search(USERS_OU);
while (items != null && items.hasMore()) {
NameClassPair ctx = (NameClassPair) items.next();
System.out.println(ctx);
Attributes attrs = context.getAttributes(ctx.getNameInNamespace());
String cn = "";
String email = "";
String givenName = "";
Attribute tmp = attrs.get("cn");
if (tmp != null) {
cn = tmp.toString();
}
tmp = attrs.get("givenName");
if (tmp != null) {
givenName = tmp.toString();
}
tmp = attrs.get("mail");
if (tmp != null) {
email = tmp.toString();
}
String strippedName = this.getUserUID(ctx.getName());
result.add(new User(strippedName, ctx.getName(), cn, email, givenName, false));
}
return result;
}
public void assignPermission(String groupName, String permissionName)
throws NamingException {
try {
ModificationItem[] mods = new ModificationItem[1];
Attribute mod =
new BasicAttribute("uniquePermission",
getPermissionDN(permissionName));
mods[0] =
new ModificationItem(DirContext.ADD_ATTRIBUTE, mod);
context.modifyAttributes(getGroupDN(groupName), mods);
} catch (AttributeInUseException e) {
// Ignore the attribute if it is already assigned
}
}
public void revokePermission(String groupName, String permissionName)
throws NamingException {
try {
ModificationItem[] mods = new ModificationItem[1];
Attribute mod =
new BasicAttribute("uniquePermission",
getPermissionDN(permissionName));
mods[0] =
new ModificationItem(DirContext.REMOVE_ATTRIBUTE, mod);
context.modifyAttributes(getGroupDN(groupName), mods);
} catch (NoSuchAttributeException e) {
// Ignore errors if the attribute doesn't exist
}
}
public boolean hasPermission(String groupName, String permissionName)
throws NamingException {
// Set up attributes to search for
String[] searchAttributes = new String[1];
searchAttributes[0] = "uniquePermission";
Attributes attributes =
context.getAttributes(getGroupDN(groupName),
searchAttributes);
if (attributes != null) {
Attribute permAtts = attributes.get("uniquePermission");
if (permAtts != null) {
for (NamingEnumeration vals = permAtts.getAll();
vals.hasMoreElements();) {
if (permissionName.equalsIgnoreCase(
getPermissionCN((String) vals.nextElement()))) {
return true;
}
}
}
}
return false;
}
public List getPermissions(String groupName) throws NamingException {
List permissions = new LinkedList();
// Set up attributes to search for
String[] searchAttributes = new String[1];
searchAttributes[0] = "uniquePermission";
Attributes attributes =
context.getAttributes(getGroupDN(groupName),
searchAttributes);
if (attributes != null) {
Attribute permAtts = attributes.get("uniquePermission");
if (permAtts != null) {
for (NamingEnumeration vals = permAtts.getAll();
vals.hasMoreElements();
permissions.add(
getPermissionCN((String) vals.nextElement()))) ;
}
}
return permissions;
}
private String getUserDN(String username) {
return new StringBuffer()
.append("cn=")
.append(username)
.append(",")
.append(USERS_OU)
.toString();
}
private String getUserUID(String userDN) {
int start = userDN.indexOf("=");
int end = userDN.indexOf(",");
if (end == -1) {
end = userDN.length();
}
return userDN.substring(start + 1, end);
}
private String getGroupDN(String name) {
return new StringBuffer()
.append("cn=")
.append(name)
.append(",")
.append(GROUPS_OU)
.toString();
}
private String getGroupCN(String groupDN) {
int start = groupDN.indexOf("=");
int end = groupDN.indexOf(",");
if (end == -1) {
end = groupDN.length();
}
return groupDN.substring(start + 1, end);
}
private String getPermissionDN(String name) {
return new StringBuffer()
.append("cn=")
.append(name)
.append(",")
.append(PERMISSIONS_OU)
.toString();
}
private String getPermissionCN(String permissionDN) {
int start = permissionDN.indexOf("=");
int end = permissionDN.indexOf(",");
if (end == -1) {
end = permissionDN.length();
}
return permissionDN.substring(start + 1, end);
}
private DirContext getInitialContext(String hostname, int port,
String username, String password)
throws NamingException {
String providerURL =
new StringBuffer("ldap://")
.append(hostname)
.append(":")
.append(port)
.toString();
Properties props = new Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.ldap.LdapCtxFactory");
props.put(Context.PROVIDER_URL, providerURL);
if ((username != null) && (!username.equals(""))) {
props.put(Context.SECURITY_AUTHENTICATION, "simple");
props.put(Context.SECURITY_PRINCIPAL, username);
props.put(Context.SECURITY_CREDENTIALS,
((password == null) ? "" : password));
}
return new InitialDirContext(props);
}
//added from http://onjava.com/pub/a/onjava/excerpt/bldgjavaent_8/index2.html?page=3
public boolean updatePassword(String username,
String oldPassword, String newPassword)
throws UserNotFoundException {
// Ensure this is a valid user, with
// a valid (old) password
boolean isValidUser = isValidUser(username,
oldPassword);
if (!isValidUser) {
return false;
}
try {
// Get the user
DirContext userContext =
(DirContext) context.lookup(getUserDN(username));
ModificationItem[] mods = new ModificationItem[1];
// Create new password attribute
mods[0] = new ModificationItem(DirContext.REPLACE_ATTRIBUTE,
new BasicAttribute("userPassword", newPassword));
// Replace old with new
userContext.modifyAttributes("", mods);
return true;
} catch (NamingException e) {
e.printStackTrace();
return false;
}
}
public void close(){
if (context != null){
try {
context.close();
} catch (NamingException ex) {
//
}
context = null;
}
}
}
/*
* Building Java Enterprise Applications
* By Brett McLaughlin
* First Edition March 2002
* ISBN: 0-596-00123-1
* http://www.oreilly.com/catalog/javentappsv1/
*/
// Snip
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data // Lombok generates all the getters and setters , hashCode toString
//If you don't want that just use your IDE to generate it :)
@NoArgsConstructor
@AllArgsConstructor
public class User {
private String strippedDn;
private String fullDn;
private String cn = "";
private String email = "";
private String givenName = "";
transient private boolean groupLess;
}
Friday, July 27, 2012
Java 7, one year later
Java 7, one year later
Java 7 got released on the 28'th of July 2011The world wide launch party was on the 7'th of July at the JUG with Alexis Moussine-Pouchkine: http://2011.geecon.org/speakerdetails/12
I had the privilege of presenting at the Jozi JUG on the 29'th of August
JRebel claims the adoption is now at 23%
Jelastic claimed 18% in the same article.
Within Jelastic's cloud service: Java 7 is at a massive 73% vs Java 6 at 27%
graph
(Thanks Judah)
Here is the git location of the source code I demoed way back.
git clone https://bitbucket.org/rjdkolb/java7jozijug.git
Or on the web : https://bitbucket.org/rjdkolb/java7jozijug/src
Wednesday, July 25, 2012
Improving the performance of a Vaadin OpenLayers Map
The problem
I am using Vaadin with it's openlayers addon
I am showing a map with about 10000 points and lines between them.
Vaadin started getting very sluglish
The Solution
Kiren Pillay suggested that I use JProfilerSo that is what I did.
I finally saw what in Vaadin was taking all the time.
getApplication() on the Panel was being called more than 50,000 times
isEnabled() was also being called on the same panel about the same amount of time.
These calls were very fast, but because of the shear number of requests, it was slowing my application down to a crawl.
So with the combination of JProfiler and JRebel I could apply these changes without a restart!
// Snip
Application app;
public MyPanel( Application app){
this.app = app;
}
@Override
public boolean isEnabled(){
return true;
}
@Override
public Application getApplication(){
return app;
}
The end result ?
A dramatic improvement in handing in the browser!
Tuesday, July 24, 2012
Your Java IDE, friend or foe ?
Your Java IDE, friend or foe ?
The new Eclipse Juno is released.
And surprise surprise, it's slow, and caused a couple of sleepless night for a friend of mine.
My advice to any new or experienced Java developer, try NetBeans 7.2.
I know Elcipse has had some of these features for ages, but
1) are they stable ?
2) Do you fear updating your ide ?
3) Is emotional attachment the biggest factor in your choice ?
Here are two videos. Copyright to Netbeans.
Original Netbeans 7.2 Overview
Original Netbeans TestNG , conditional breakpoints video
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