java 6 [mustang] - features and enchantments

1Visit me @ www.Pavel-Kaminsky.com

Java 6 : Mustang

Unleashed!

Visit me @ www.Pavel-Kaminsky.com 2

Source Code SVN

All Sources can be checked out (SVN) from here:

http://code.google.com/p/java6-features/

What’s New?• Web Services• Scripting• Database• More Desktop APIs• Monitoring and Management• Compiler Access• Pluggable Annotations• Desktop Deployment• Security• Performance and Quality


Language Enhancements in Java SE 6

No language changes were introduced in Java SE 6 !!!!!!!!!

where is my “syntactic sugar”?!



JAX-WS 2.0 (JSR 224)• includes– “Java Architecture for XML Binding” (JAXB) 2.0.

– “SOAP with Attachments API for Java” (SAAJ) 1.3.


@WebServicepackage webServices;

import javax.jws.WebService;

import javax.xml.ws.Endpoint;

/**

* @Author: [email protected]

* @Date: 11/09/11

*/

@WebService

public class CalculatorWS {

public int add(int a , int b) {

return a+b;

}

public static void main(String[] args) {

Endpoint.publish("http://localhost:8080/calculator",new CalculatorWS());

}

}

Scripting (JSR 223)• Scripting language independent framework for using script engines from Java code

• Write customizable/extendable applications in the Java language and leave the customization scripting language choice to the end user

• The Java application developer need not choose the extension language during development

• Sun's implementation of JDK 6 is co-bundled with the Mozilla Rhino based JavaScript script engine.


Scripting – examplepackage scripting.example2;

/**

* @Author: [email protected]

* @Date: 31/08/11

*/

import javax.script.*;

import java.io.File;

public class InvokeScriptMethod {

public static void main(String[] args) throws Exception {

ScriptEngineManager manager = new ScriptEngineManager();

ScriptEngine engine = manager.getEngineByName("JavaScript");

engine.eval(new java.io.FileReader(new File("src/scripting/example2/script.js").getAbsoluteFile()));

Invocable inv = (Invocable) engine;

// get script object on which we want to call the method

Object obj = engine.get("obj");

// invoke the method named "hello" on the script object "obj"

inv.invokeMethod(obj, "rock", "Pavel-Kaminsky.com" );

}

}


Scripting – example

• Scripts.jsvar obj = new Object();

obj.rock = function(name){

result = name + ',Are you ready to rock?!!'; print(result); return result;

}

• Output : Pavel Kaminsky , Are you ready to rock?!!

• Answer: HAIL YEAH!!!


Importing Java Packagespackage scripting.example3;

/** * @Author: [email protected] * @Date: 31/08/11 */

import javax.script.Invocable;import javax.script.ScriptEngine;import javax.script.ScriptEngineManager;import java.io.File;import java.util.ArrayList;

public class ScriptMethodImportPackages { public static void main(String[] args) throws Exception {

ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName("JavaScript"); engine.eval(new java.io.FileReader(new File("src/scripting/example3/script.js").getAbsoluteFile())); Invocable inv = (Invocable) engine; String myArray[] = (String[]) engine.get("myArray"); ArrayList yourArray = (ArrayList)engine.get("yourArray");

System.out.println(myArray[myArray.length-1]); System.out.println(yourArray.get(yourArray.size()-1));

}}


Scripting – example 1

• Scripts.js

var myArray = java.lang.reflect.Array.newInstance(java.lang.String, 1);var yourArray = new java.util.ArrayList();

myArray[0] = "this is MY Array!";yourArray.add("this is YOUR Array!");

• Output :

this is MY Array!this is YOUR Array!


Database• Shipped with a Java DB ( = DB Apache Derby)

– A transactional, relational database.– storage of a database archived in a JAR file,

which allows you to simply distribute the JAR file.

• Start/Stop locally :• java jar derbyrun.jar server start 192.168.0.1 1555�

• Accessed via JDBC

• The $JAVA_HOME/db subdirectory contains class libraries for Java DB, Sun Microsystems's distribution of the Apache Derby database technology.


Database Examplepackage database;

/** * @Author: [email protected] * @Date: 31/08/11 */

import java.sql.*;

public class JavaDBExample { static Connection conn;

public static void main(String[] args) throws Exception {

if (args.length != 2) { System.out.println("Usage: <Name> <Address>"); System.exit(1); }

String dbName = "UsersDB"; String connectionURL = "jdbc:derby:" + dbName + ";create=true"; Class.forName("org.apache.derby.jdbc.EmbeddedDriver"); conn = DriverManager.getConnection(connectionURL);

// create table Statement stmt = conn.createStatement(); stmt.executeUpdate("CREATE TABLE USERS (ID NUMBER NOT NULL, UserName VARCHAR(250) NOT NULL)");


// insert user PreparedStatement psInsert = conn.prepareStatement("insert into USERS

values (?,?)"); psInsert.setInt(1, 1); psInsert.setString(2, "Lenny Kravitz"); psInsert.executeUpdate();

// load user Statement usetStmt = conn.createStatement(); ResultSet rs = usetStmt.executeQuery("select * from USERS");

while (rs.next()) { System.out.println("Id: " + rs.getInt(1) + " Name" +

rs.getString(2)); } rs.close(); }}

• Output :

Id:1 Name:Lenny Kravitz


java.awt.Desktop class

• Minimize the difference between the performance and integration of native applications and Java applications.

• Adopted JDesktop Integration Components (JDIC) API (http://jdic.dev.java.net/)


Java.awt.Desktoppublic static enum Action { /** * Represents an "open" action. * @see Desktop#open(java.io.File) */

OPEN, /** * Represents an "edit" action. * @see Desktop#edit(java.io.File) */

EDIT, /** * Represents a "print" action. * @see Desktop#print(java.io.File) */

PRINT, /** * Represents a "mail" action. * @see Desktop#mail() * @see Desktop#mail(java.net.URI) */

MAIL, /** * Represents a "browse" action. * @see Desktop#browse(java.net.URI) */

BROWSE };


• Desktop.isDesktopSupported() – checks whether Desktop functionality is available.

• Desktop desktop = Desktop.getDesktop(); desktop.isSupported(Desktop.Action) – check whether the functionality is available.

• 5 New functionalities : public void mail() throws IOException public void open(File file) throws IOException public void edit(File file) throws IOException public void print(File file) throws IOException public void browse(URI uri) throws IOException

Let’s See a DEMO!


System Tray Functionality

• Now it’s possible to hook the “System Tray”– SystemTray tray = SystemTray.getSystemTray();

public TrayIcon(Image image, String tooltip, PopupMenu popup)

public static boolean isSupported() public void add(TrayIcon trayIcon) throws AWTException public void remove(TrayIcon trayIcon)

Let’s See a DEMO!

Question : why there is no AWTException thrown on “remove” method?


Monitoring and Management

• Improvements in jconsle• “jps” tool - Roll call of all the names and

numbers of all the Java processes on your machine. Good for other command lines as they required id’s.

>C:\Users\kaminskp>jps.exe>5484>5324>7816 Jps

• “jhat” - Java Heap Analysis Tool


Usage• Find java application id with jps.• Create a dump with jmap into a file.

C:\Users\kaminskp>jmap -dump:file=output.txt <id>

• Jhat the dump file.C:\Users\kaminskp>jhat output.txt Reading from output.txt...Dump file created Thu Sep 01 13:18:09 IDT 2011Snapshot read, resolving...Resolving 45981 objects...Chasing references, expect 9 dots.........Eliminating duplicate references.........Snapshot resolved.Started HTTP server on port 7000Server is ready.• Browse to http://localhost:7000


Let’s see an Example!

Personal Recommendation

• Don’t use JHat.• Use IBM’s MAT (Memory Analyzing Tool)

instead , download here.


Compiler Access (JSR 199)

• Compile java source files from within java files• No need to fork into new javac.exe process

JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

int run(InputStream in, OutputStream out, OutputStream err, String... arguments);

• Good for IDE’s (compiling on the fly)


compiler.run(null, null, null, “One.java”, “Two.java”);

Let’s see an Example!

Pluggable Annotations (JSR 269)

• @Annotation – remember that ?!?• Common annotations :

@SuppressWarnings@Override @Deprecated

• Integrate custom annotation with compiler!


Example (included in the example’s code)

• Let’s create a new annotation

package pluggableAnnotations;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;

@Retention( RetentionPolicy.SOURCE )

@Target( ElementType.METHOD )

public @interface Borat {

}


BoratBuilderProcessorpackage pluggableAnnotations;

import javax.annotation.processing.AbstractProcessor;import javax.annotation.processing.RoundEnvironment;import javax.annotation.processing.SupportedAnnotationTypes;import javax.annotation.processing.SupportedSourceVersion;import javax.lang.model.SourceVersion;import javax.lang.model.element.Element;import javax.lang.model.element.TypeElement;import javax.tools.Diagnostic;import java.util.Set;

@SupportedAnnotationTypes("pluggableAnnotations.Borat")@SupportedSourceVersion(SourceVersion.RELEASE_6)

public class BoratBuilderProcessor extends AbstractProcessor {

@Override public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

for (TypeElement typeElement : annotations) { for (Element element : roundEnv.getElementsAnnotatedWith(typeElement)) { this.processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,

"I Like! but we don't use this method in Kazakhstan", element); } } return true; }}


Packaging

• Create an “META-INF/Services” Folder• Add a text file named

javax.annotation.processing.Processor• Insert the path to BoratBuilderProcessor into

the file• Package into Jar!


Visual ..


Create a TestApp

• Link the jar into your project (I use IntelliJ)


Tester.javaimport pluggableAnnotations.Borat;import javax.annotation.processing.Processor;import java.util.ServiceLoader;

public class Tester {

@Borat public static String annotateMe() { return "Welcome to America"; }

public static void main(String[] args) { ServiceLoader<Processor> processors =

ServiceLoader.load(Processor.class); for (Processor processor : processors) { System.out.println(processor.getClass().getSimpleName() + " : " +

processor.getClass().getCanonicalName()); }

System.out.println(Tester.annotateMe()); }}


javac

• What do you think would happen?


Visit me @ www.Pavel-Kaminsky.com

Desktop Deployment• Swing Improvements for Windows and GTK look and Feel

• Can you tell the difference?!

29


More “Perks”• JTable Sorting and Filtering

no more customs implemantations.

JTable table = new JTable(model);final TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(model);table.setRowSorter(sorter);

sorter.setRowFilter(RowFilter.regexFilter(text));

• New Modality – Modeless – no modality– Document-modal - blocks all windows from the same document , except those from its

child hierarchy– Application-modal - blocks all windows from the same application , except those from its

child hierarchy– Toolkit-modal - blocks all windows that run in the same toolkit , except those from its child

hierarchy


More “Perks”• Splash Screen – revamped

• Security Dialogs


Security

• Kerberos Integration• Support for Smart Card I/O API• JAAS-based authentication using LDAP


Performance


SPECjbb2005 Test• SPECjbb2005 is an industry-standard benchmark designed

to measure the server-side performance of Java runtime environments

• SPECjbb2005 bops (business operations per second), obtained by averaging the total transaction rate in a SPECjbb2005 run from the expected peak number of warehouses, to twice the peak number of warehouses

• Bops metric measures the overall throughput achieved by all the JVMs in a benchmark run. SPECjbb2005 bops/JVM reflects the contribution of a single JVM to the overall metric , and is thus a measure of the performance and scaling of a single JVM

• http://www.spec.org/jbb2005/results/


Server Side Performance


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