Java Pub House (general)

So, here's the deal, I went down from Chicago to JavaOne 2013, and took Bob Paulin along. There are sooo many sessions and such great content that it was really hard to know when to start. So we decided to do something cool! We set-up shop in the heart of JavaOne and grab unsuspecting speakers and ask them to spare a couple of minutes to tell us about their sessions (all awesomeness!). 

And the good news is that Oracle will make all of the presentations referred in this talk (and much more) available for everyone! Take a listen and prepare to be amazed by the awesome presenters of JavaOne.

 - Arun Gupta (@arungupta)

 - Bruno Souza (@brjavaman)

 - Danno Ferrin (@shemnon)

 - Hanz Dockter (@gradleware)

 - Charles Nutter (@headius)

 - Yoav Landman (@yoavlandman)

Direct download: JPHJavaOne.mp3
Category:general -- posted at: 9:21pm CDT

It happens all the time, you are working and suddenly you need to database an object. And maybe you have a fancy O/R Mapper or something like that, but we seldomly ask 'do we really need this in a relational format?'. There are actual alternatives (from byte serialization to xml, to, oh, my, NoSql databases). Here we explore the reasons why you may want to skip the Object Relational mapping and concentrate more on ease of development!

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Hey it's Freaking HOT outside! beer...beer...beeeeeer.....:)


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Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

Direct download: JPHE39.mp3
Category:general -- posted at: 8:30pm CDT

You remember recursion right? that ugly, confusing thing they made you do either on CS-300, or at job interviews. Have you ever wondered how to make it safe and right? and why do we really use recursion? In this episode we go into proper recursion programming (and lose the fear of making it wrong), and understand why stacks get filled with it, and what problems do they really solve (answer, not many).

In addition we talk about the nature of Double objects, vs double the primitive (And why it is so hard to do == comparisons in doubles), plus some little known things about Strings (like interning). In all it has a little bit for everyone, so take a listen!

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And if you like what you hear, treat me a beer!

 

Hey it's winter (and not too many reasons to be outside, so might as well stay home and drink a few!) If you like what you hear, treat me a beer ! :) (It's the Java pub house after all :)



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Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :)
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

Direct download: JPHE35.mp3
Category:general -- posted at: 10:09am CDT


Shout out to the Chicago Java User's Group! Glad to be part of the Board!

And Shout out to Peter Hendriks and Tim Prijn for their presentation!(https://oracleus.activeevents.com/connect/sessionDetail.ww?SESSION_ID=4153). If interested, click on the 'media' icon on the right side!

With the establishment of Java 7 as the de-facto JRE of Oracle, the clock is ticking down for Java 6! It will be End-Of-Life around February 2013, so we better get going and upgrade! In this episode we cover how to migrate to Java 7, and cover some of the most notable Java 7 features (Networking nuts, your prayers have been answered!) while preparing a path to upgrade. If you have a Java 6 (or 5 or 4) project, this is mandatory listening!

If you just joined us, remember to follow me on Twitter! (@fguime)

and IF you really really really really really really really really really really really really really REALLY like what you hear, treat me a beer!




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Java 7 Features
Compatibility issues (At least glance at this section!)
Oracle session: CON4153 - Migrating Real-World Million-Line Code Bases to Java 7: Lessons Learned

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Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :)
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

Direct download: JPHE32.mp3
Category:general -- posted at: 3:47pm CDT


Big shout-out to everyone I met at JavaOne (including some avid podcast listeners!). Thanks for listening and for a great time down at JavaOne! Don't worry, we will be sharing all the stuff I learned on new episodes of the podcast.

It is also our Birthday (We have been airing episodes for a year!)! Happy to celebrate with everyone a year of the podcast (and if you want to celebrate it, treat me a beer! :) ).

With this episode we wrap the concept of generics and bounds (super / extends) and talk about type erasure (and compiler warnings that goes 'Hm, dunno what you're doing but I can't make sure it's right'

And, that...is that!

If you just joined us, remember to follow me on Twitter! (@fguime)

and IF you like what you hear, treat me a beer!

Beer of the Episode: Still hung-over from JavaOne's big concert (Go Pearl Jam!)


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Oracle Java Generics (what we're following on this podcast) http://docs.oracle.com/javase/tutorial/java/generics/
Dr Venkat presentation on Generics (Click on the "Media" at the right side for the presentation, a great presentation
Agile Developer (Dr Venkat's Must-check website and blog
Angelika Langer FAQ on Generics

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Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

Direct download: JPHE31.mp3
Category:general -- posted at: 11:14pm CDT

Episode 30. I always thought Generics were as good as brand name Erasers (Java Generics part 1) ----
Hi there! Finally back on a (hopefully) standard schedule. I have been moving a house with three kids, two cats, one wife, one dog, and one grandma (they are heavy!, just kidding!) and just found the box with the podcast equipment! we hit the ground running with Generics. What are the benefits (and potential pitfalls) of Generics? Why do we even need them at all? The syntax looks pretty confusing, but with some Jedi Mind tricks one can actually start seeing how they work. If you use Generics (Almost everyone does :)) you should take a listen!

Ah! and if you are going to JavaOne check my t-shirt on the previous post

And if you just joined us, remember to follow me on Twitter! (@fguime)

Also, we are getting close to our first

BIRTHDAY!

If you have followed us all year long, or just recently join us, and like what you hear, treat me a beer!

Beer of the Episode: No beer, just coffee (it's hard to move a whole house



Tweet, Tweet! (https://twitter.com/#!/fguime)
Oracle Java Generics (what we're following on this podcast) http://docs.oracle.com/javase/tutorial/java/generics/

Vote for us in iTunes (http://itunes.apple.com/us/podcast/java-pub-house/id467641329)
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ITunes link (http://itunes.apple.com/us/podcast/java-pub-house/id467641329)
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Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4


Direct download: JPHE30.mp3
Category:general -- posted at: 12:33pm CDT

We go and visit the Primordial Java Concepts. As rules set in stone we explore the concept of multiple inheritance, method and variable scope (including the final keyword), abstract methods and @override. This is good for those starting up their Mad Java SkillZ (We're L33T, u K|\|0w?), or for those who were always curious why the language is this way.

And if you like the podcast, subscribe to my Twitter Feed! http://www.twitter.com/fguime

Beer of the Episode: Leinenkugel's Sunset Wheat
|~|P |~|P |~|P |~|P |~|P |~|P |~|P Leinenkugel's Sunset Wheat
|_|  |_|  |_|  |_|  |_|  |_|  |_|

 

It's THE END OF SUMMER! If you like what you hear, DEFINITIVELY, treat me a beer ! :) (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4
|~|P |~|P |~|P |~|P |~|P |~|P |~|P Leinenkugel's Sunset Wheat
|_|  |_|  |_|  |_|  |_|  |_|  |_|

 

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Scopeshttp://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html

Override annotationhttp://stackoverflow.com/questions/94361/when-do-you-use-javas-override-annotation-and-why

Abstract Methods and Classeshttp://docs.oracle.com/javase/tutorial/java/IandI/abstract.html

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Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

Direct download: JPHE29.mp3
Category:general -- posted at: 10:11pm CDT

As developers, we have to deal with Exceptions every day (or at least every other day). In this episode we dive a bit on exception (and exception handling), plus we talk about certain behaviors that are not so well-understood (try returning from a finally block, or why exception stack traces sometimes misteriously disappears). A good review for those who already know, and a great primer for those diving into Exceptions, this episode is sure to show some surprises!

(~)P (~)P (~)P (~)P (~)P (Beer) (~)P (~)P (~)P (~)P

It's SUMMER! If you like what you hear, DEFINITIVELY, treat me a beer ! :) (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

(~)P (~)P (~)P (~)P (~)P (Beer) (~)P (~)P (~)P (~)P

 

Tweet, Tweet! (https://twitter.com/#!/fguime) Try-with-resources constructhttp://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html

Exception Definitionhttp://docs.oracle.com/javase/tutorial/essential/exceptions/definition.html

Checked vs Unchecked Exceptions Debatehttp://www.ibm.com/developerworks/java/library/j-jtp05254/index.html

More Exception Debates from C vs C++, still a useful read. http://www.250bpm.com/blog:4

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ITunes link (http://itunes.apple.com/us/podcast/java-pub-house/id467641329)
Java 7 Recipes book!(http://www.amazon.com/gp/product/1430240563/ref=as_li_ss_il?ie=UTF8&tag=meq-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1430240563)

Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

Direct download: JPHE26.mp3
Category:general -- posted at: 11:06pm CDT

Episode 25. Reflection and vampire classes, and compiling Java from within Java.

We have heard the word "Reflection" thrown around, what does it mean? it is a new Twilight series? is it about Vampires? In all, we shed sunlight into what reflection is (and more importantly why in the world you want to use it). And also cover a technique to compile and load programs within your program. Javascript guys had access to this by doing eval("your program here"), and while Java doesn't have an eval function, there are ways of achieving similar results (and very specific reasons to do this crazy technique. Mostly performance)

 

It's SUMMER! If you like what you hear, DEFINITIVELY, treat me a beer ! :) (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

 

Nimbus code to get the dang CacheMode (considered a private variable)

public class ButtonPainter extends AbstractRegionPainter {
    public ButtonPainter() {

        Class<?> c = null;
        PaintContext ctx = new PaintContext(new Insets(0,0,0,0), new Dimension(100,100), false, null, Double.POSITIVE_INFINITY, 2.0 );

        try {
            c = Class.forName("javax.swing.plaf.nimbus.AbstractRegionPainter$PaintContext$CacheMode");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        if (c != null) {
            Object cacheMode = c.getEnumConstants()[2];			// NINE_SQUARE_SCALE
            for (Field field : ctx.getClass().getDeclaredFields()) {
                if (c.getName().equals(field.getType().getName())) {        // if Field is the CacheMode
                    try {
                        // the following lines would not be necessary for example if
                        // AbstractRegionPainter.cacheMode were protected or public.

                        field.setAccessible(true);                          // make it accessible so that we can set it
                        field.set(ctx, cacheMode);                          // set the cachemode
                        // this is equivalent as sayin "ctx.cacheMode = CacheMode.NINE_SQUARE_SCALE" if it were public/protected
                        break;
                    } catch (IllegalAccessException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

    }

    @Override
    protected PaintContext getPaintContext() {
        return null;  //To change body of implemented methods use File | Settings | File Templates.
    }

    @Override
    protected void doPaint(Graphics2D g, JComponent c, int width, int height, Object[] extendedCacheKeys) {
        //To change body of implemented methods use File | Settings | File Templates.
    }
}





Code to get instance from a source file

    public static Object getInstanceForSource(String className, String sourceForRule) {
        String filename = "tmp/" + className + ".java";
        File file = new File(filename);
        writeFile(filename, sourceForRule);				
        String classPath = System.getProperty("java.class.path");
        String[] args = new String[]{
                "-classpath", classPath,
                filename
        };


        StringWriter compilerOutput = new StringWriter();
        int status = com.sun.tools.javac.Main.compile(args,new PrintWriter(compilerOutput));
        additionalInfo.value = compilerOutput.toString();
        switch (status) {
            case 0:  // OK
                // Make the class file temporary as well
                File classFile = new File("./tmp/");
                try {
                    // Try to access the class and run its main method
                    URLClassLoader loader = new URLClassLoader(new URL[] {classFile.toURI().toURL()});
                    Class clazz = loader.loadClass(className);
                    return clazz.newInstance();
                } catch (Exception ex) {
                    additionalInfo.value = "Exception in main: " + Utilities.exceptionToString(ex)+"\n"+additionalInfo.value;
                }
                break;
            case 1:
                System.out.println ("Status: Error" +"\n"+additionalInfo.value);
                break;
            case 2:
                System.out.println ("Status: CMDERR" +"\n"+additionalInfo.value);
                break;
            case 3:
                System.out.println ("Status: SYSERR" +"\n"+additionalInfo.value);
                break;
            case 4:
                System.out.println ("Status: ABNORMAL" +"\n"+additionalInfo.value);
                break;
            default:
                System.out.println ("Status: UNKNOWN" +"\n"+additionalInfo.value);
                break;
        }
        return null;
    }

    public static void writeFile(String fileName, String content) {
        Writer writer;
        File file = new File(fileName);
        try {
            writer = new BufferedWriter(new FileWriter(file));
            writer.write(content);
            writer.close();
        } catch (IOException e) {
           System.out.println ("I/O exception "+e);
        }
    }


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Reflection 'trail' http://docs.oracle.com/javase/tutorial/reflect/index.html
Create dynamic applications with javax.tools http://www.ibm.com/developerworks/java/library/j-jcomp/index.html
URLClassLoaders (loads .class files generatedhttp://docs.oracle.com/javase/6/docs/api/java/net/URLClassLoader.html

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Hey! if you like what you hear, treat me a beer! (It's the Java pub house after all :) https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z8V2ZWV93UMW4

Direct download: JPHE25.mp3
Category:general -- posted at: 11:01pm CDT

In this podcast we turn and talk of that embarassing uncle that every API has (java.util.date), you know, the one that you have to live with because is family, but don't really like that much? We dive into what to avoid when using Date (and Calendar), and the most common pitfalls that we have falled for (1000*60*60*24 anyone?). In all, if you have used date extensively you probably already migrated to JodaTime, but if you are a casual user, then take a listen, just to make sure you are not bitten by the Date traps!

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http://joda-time.sourceforge.net/ (Joda Time)
http://www.wolkje.net/2010/01/06/java-date-and-time-api-and-jsr-310/(New Date JSR + what goes under the covers)

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Direct download: JPHE20.mp3
Category:general -- posted at: 8:19pm CDT