Dec 07 2017

Experience cloud

Category: MiscellaneousIuliana @ 11:12

I created this for a presentation about my experience and skills and I thought it belongs here.

The word cloud above covers all my 11 years of development so far and clearly reveals which topics I am best at. Although I always wished myself to become and agnostic developer, also known as a polyglot developer, after all these years I have to accept the fact that Java & Spring are clearly my strongest points.

Where should I go from now? Well… I have considered learning Kotlin for a while. ;)

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Sep 18 2013

The repetitive programmer

Category: TechnicalIuliana @ 12:36

You know who you are. I know who you are. And I hate you. And I despise you. Every time I have to  work with your code my brain keeps screaming WHY? WHY?WHYYYYYYY?  and I begin to think you are retarded. Or maybe just not retarded, but maybe you learned to program on another planet, because no programmer from this Earth, not even a mediocre one would write code like you do and also be paid for it. I would not pay you for it, I would send you do dig holes or clean shit pipes or something that does not imply any brain power whatsoever. Because you have none!

Sample:

// [bla bla  bla - code that I won't put here]
final ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
	Document document = new Document(PageSize.A4);
	PdfWriter writer = PdfWriter.getInstance(document, bos);
        // [bla bla  bla - code that I won't put here]
	if (document != null) {
	    document.close();
	}
	if (writer != null) {
	    writer.close();
	}
        // [bla bla  bla - code that I won't put here]
        OutputStream outputStream = new FileOutputStream(attachmentURL);
	bos.writeTo(outputStream);
        // You might notice that the outputStream was not closed
} catch (MailException e) {
        if (log.isWarnEnabled()) {
                log.warn("Cannot send email for something " + something.getId(), e);
	}
	sendAdminMessage("Error sending email message to user", "Cannot send email for something nr "
			+ something.getId() + ". Message is = " + e.getMessage());
			return false;
} catch (MessagingException e) {
	if (log.isWarnEnabled()) {
		log.warn("Cannot send email of something " + something.getId(), e);
	}
	sendAdminMessage("Error sending email message to user", "Cannot send email for something nr "
			+ something.getId() + ". Message is = " + e.getMessage());
			return false;
} catch (IllegalArgumentException e) {
	if (log.isWarnEnabled()) {
		log.warn("Cannot send email ofsomething " + expressOrder.getId(), e);
	}
	sendAdminMessage("Error sending email message to user", "Cannot send email for something nr "
			+ something.getId() + ". Message is = " + e.getMessage());
			return false;
} catch (MalformedURLException e) {
	if (log.isWarnEnabled()) {
		log.warn("Cannot send email of express order " + something.getId(), e);
	}
	sendAdminMessage("Error sending email message to user", "Cannot send email for something nr "
			+ something.getId() + ". Message is = " + e.getMessage());
			return false;
} catch (IOException e) {
	if (log.isWarnEnabled()) {
		log.warn("Cannot send email of something " + something.getId(), e);
	}
	sendAdminMessage("Error sending email message to user", "Cannot send email for something nr "
			+ something.getId() + ". Message is = " + e.getMessage());
			return false;
} catch (DocumentException e) {
	if (log.isWarnEnabled()) {
		log.warn("Cannot send email of something " + something.getId(), e);
	}
	sendAdminMessage("Error sending email message to user", "Cannot send email for something nr "
			+ something.getId() + ". Message is = " + e.getMessage());
			return false;
}

So, 7 catch-es, for seven types of exceptions, we do the same thing for every type of exception, write the same code, because it looks good in the SVN if somebody looks, he will see that you wrote a lot of code. A lot of crap more like it. And why the hell do you not make sure all your streams are closed??
The person who wrote this code is payed a few thousand euros to write code like this. Yeah, I guess the recruitment department sucked ass when this person was hired.

So yeah, if you write code like this, quit programming now and look for another job. You clearly are not made for this and you are a despicable person.

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Oct 13 2012

Learning Spring, part III

Category: TechnicalIuliana @ 18:15

I have a new hot question for you:

We have two classes AccountServiceImpl and ClientServiceImpl. Any of these classes inherits from each other, meaning one is a subclass of the other. What will happen if we define a pointcut like this:

"execution( * *..AccountServiceImpl.update(..)) 
       && execution( * *..ClientServiceImpl.update(..)) "

And here are your options:

  1. The pointcut matches any public update methods of the two classes whatever the arguments.
  2. The pointcut matches any update methods of the 2 classes whatever the arguments and the method visibility.
  3. The pointcut matches any update methods of the two classes, with one ore more arguments and whatever the method visibility.
  4. No join point is defined.
  5. Something else will happen.

Continue reading “Learning Spring, part III”

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Sep 15 2012

Learning Spring

Category: English posts,TechnicalIuliana @ 23:47

A few months ago the company where I am currently employed sent me to Belgrad to train me in Spring Core. The training lasted 4 days and at the end I was supposed to take the Spring Core certification exam and pass it.

I delayed that for a while, but because now I have some spare time I decided it was time for me to do this thing. So I went over the slides and the spring code samples again. But after doing some mock tests I concluded I will most likely fail the certification, because the official materials were not enough so I started reading Spring in Action. Still I noticed that in the tests there was still stuff that I hadn’t covered. So I started reading Spring Reference. And because I have some problems in retaining information just by reading it, I stared to test the recommended examples. And this is where I hit some walls.

But before telling you what is not clear for me I shall tell you what technologies I’m using for development: Maven 3.0.0, Jdk 1.7, Intellij Idea 11.1.3 and Spring 3.1.2 (I know the certification is for 3.0, but as the Spring reference manual has 840 pages, I might as well read about the new and useful stuff added in 3.1)

The first problem I had was with the compound property names. I tried using them. Idea does not recognize them and my test fails.

Continue reading “Learning Spring”

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Jun 19 2012

when you have an itch…

Category: English posts,TechnicalIuliana @ 10:34

… you gotta scratch it. And I had a serious itch cause by my Windows. Even if Windows has evolved so much, even if Windows 7 is the peak of greatness among all the Windowses before it, it still does not know how to manage 4 core processors. So I was seriously pissed about the fact that Windows 7 froze from time to time, making my super-laptop look like my first computer, an AMD K6, 500 MHz and 256 MB SRAM. Which was definitely not cool, considering the fact that my laptop’s configuration looks like this: Intel Quad Core i5-450M and 6 GB DDR3. The only reason I kept windows so far on my laptop was that my processor has a capability known as turbo boost, meaning that can over-clock itself when needed. But this won’t be needed that much if the tasks were efficiently distributed between the 4 cores, which were not.

So two days ago, I just snapped, decided to give up the possibility of playing games for a while and went on a search for the perfect Linux for my laptop. I am fond of Gentoo as you know, but compiling a full OS was not an option because it is a time-consuming operation and also because all that compiling would set my laptop on fire and it’s already hot in Romania right now (32 Celsius degrees). So I was left to choose between Archlinux and Mint. I did not even consider Ubuntu, it’s a Linux that looks and acts like Windows, the thing I was trying to get rid of. I had Archlinux before and I know in order to get the final result some time must be wasted on its configuration, so I went for Mint.

In less than 30 minutes I had a fully functional and compact Linux, oh well … fully for a normal user, not for me, a curios developer. So after this I went on and started installing the development software. The first one I wanted to install was the jdk. Mint uses open-jdk which Idea and STS refuse to go along with, so I went on a quest for installing the Oracle version. If on other Linux systems this was a piece of cake on Mint, it was not so, because Mint has all these symlinks pointing to open-jdk binaries, and even if you do everything right, set the JAVA_Home variable and add it to the path, when you will execute “java -version” in the console, the binary that will be executed will still be the one of the in the open-jdk. The only way to change this is to go to /usr/bin, see where the specific symlinks point to and change that. After that I installed Idea and STS and everything was flawless.

Then I wanted to add a second monitor and this is where all blew up in my face. But not because there was something wrong with Mint, but because one of the cables was not plugged in correctly in my monitor and the system did not see it. I did not even consider that the problem might come from a cable and went on and tried to install nVidia drivers in order to convince the system to see my external monitor. After the first restart I was left without an interface, because the nVidia drivers were not stable, ofcourse. So I went old-school and installed lynx, a text based browser, and searched for a solution for my problem. I did so and tried different options for an hour, when finally it worked and I had my graphic interface back, but the external monitor still was invisible to Mint, so I considered the possibility of the monitor not actually being plugged in the laptop. I check the cables and … surprise. It detected it right away.

Conclusion: if you want to install a Linux on your laptop, I truly recommend Mint, it is small, smart, fast and it knows how to work the special buttons on your laptop, without any additional settings. And is also easy to install, if you are not an old-school developer who considers problems being caused by the software first :D , that is. :)

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May 05 2012

What does a passionate developer do…

Category: English posts,TechnicalIuliana @ 22:35

… when is stuck in a hotel room because of the rain, bored out of his mind and with no mood to work? Well when that happens to me I start to reed my java feed reader and depending on what I find there I might write my own articles. So… yes, this article is today’s consequence of boredom.

1. What is the flaw with the Stack class?
Actually, there are two of them all being caused by the fact that java.util.Stack extends java.util.Vector:
I. Extending Vector methods insertElementAt and removeElementAt can be called and they actually work, so the stack definition is not respected (that part with only the last inserted element being accessible, the LIFO principle)
II. Extending Vector, Stack is also synchronized which makes it slow and when synchronization is not necessary this  is quite inefficient. This is not exactly a flaw, it’s more of a personal observation observation.

Then again in the api it is written that “It extends class Vector with five operations that allow a vector to be treated as a stack “, so I guess these are not flaws, the Stack class just works as intended. (Recommendation: use ArrayDeque)

2. Can an interface extend multiple interfaces?
There is no right answer to this question, because it depends of the point of view of the interviewer.
I. Yes, because you can define an interface like this:
public interface MultipleIntf extends List, Serializable {
}
II. No, extending means actually inheriting all functionality of the super-entity and  perhaps adding new functionality, in the case of interfaces there is nothing to inherit and no functionality to add. Except for the obligation to implement all abstract methods that will be enforced on the implementing class.

3. What is lazy loading?
Lazy loading is a name to describe the process of not loading something (object/class) until needing it. This question will surely take you to a ClassLoader discussion, so it is better to know and understand the Java Class Loading mechanism.
So:
– the java source files are compiled into executable code for the JVM, called bytecode, stored into *.class files.
– at start-up JVM has no loaded classes. When the first class is loaded, the classes on which its execution depends are searched and loaded too. So if I have a class which has imports statement for ArrayList and Serializable, the JVM will load my class, then it will search and load ArrayList.class and Serializable.class. Let’s imagine we have a big application with a lot of class files and one of them is missing. The application will run just fine, until we try to access a functionality implemented by that class, when the JVM will let us know that the class was not found by throwing a java.lang.ClassNotFoundException.
And this my darlings is lazy loading. A class is not loaded until used and there would be no point in doing that for efficiency reasons. Right? Anyway, if you want to have a deep understanding of the Java Class Loader, I recommend this article.

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Jan 26 2012

Java stuff that you should know:What are the differences between C++ and Java?

Category: English posts,Miscellaneous,TechnicalIuliana @ 16:48

Java vs. C++ Because somebody brought up this subject here I decided that this is the question I should answer next. I am a developer from the old generation,at least this is how we call it here in Romania. Turbo Pascal was my first, (red cheeks :D) then I learned C, C++, Php, Java and .Net. With Java and C++ I have had the longest and most stable relationships. So I think I am able to answer this one, though I have to mention that nowadays you could be asked to compare Java to other languages too.

Again this can considered to be a difficult question mostly because there are a lot of differences between these two languages. That’s why you want to start your answer with the differences that remove any doubt that you know both languages pretty well, and usually this means getting technical. This is the how I would answer this question:

  • Java is multi-threaded, C++ is not
  • In Java primitive and reference data types are always passed by value, C++ uses also references and pointers.
  • Java has no pointers, C++ does
  • Java has implicit memory management through garbage collector, in C++ memory management is explicit
  • Java does not allow operator overloading,  C++ does
  • Java does not need destructors, C++ does
  • Java does not have type struct and union, C++ does
  • In Java, types cannot be overridden, in C++ we can do that.
  • Java does not provide multiple inheritance using classes (or virtual inheritance), C++ does
  • In Java, arrays have fixed sizes and attempt to read from an index bigger that size -1, will cause an exception. In C++ attempt to read from an index bigger that size-1 might even succeed and the value returned is the current value stored int that memory block.
  • Java programming model is totally compatible with OOP programming. C++ also supports functional programming, procedural and template programming.
  • Java is a WORA/WORE – write once run anywhere/everywhere (any compatible JRE ) , C++ is a WOCA – write once compile anywhere
  • Java has built-in support for comment documentation
  • Java has no native support for unsigned arithmetic, C++ does. (Has anybody used that in C++, ever?)
  • In Java there is no need for scope resolution operator (::)

Of course there’s more, but this should be enough at an interview. Fell free to add anything you might consider important. As always I am eager to learn new stuff.

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