Csaba Szegedi

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since Mar 27, 2010
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Recent posts by Csaba Szegedi

Hello Peter,

You were right.
The error can be more concrete, that was miss leading for me as a starter.

Thanks 3x

Peter Johnson wrote:What all is in that lib directory? Ant doesn't like the properties file because it is not a zip file (jar files are zip files). Try using an includes directive to include only the jar files in the lib directory. Example:

10 years ago
Hello,

I would like to use the ant-contrib, it works well, but before the result, I get this below:

Unable to obtain resource from /home/csaba/ant/apache-ant-1.9.0/lib/libraries.properties: java.util.zip.ZipException: Not a valid zip file
[taskdef] Unable to obtain resource from /home/myname/ant/apache-ant-1.9.0/lib/libraries.properties:
[taskdef] java.util.zip.ZipException: Not a valid zip file

Code which raise the exceptions:


How can I remove this kind of exceptions ?
Thanks in advance.

Cs.
10 years ago

Seetharaman Venkatasamy wrote:

Csaba Szegedi wrote:My question was about catching this kind error.


Oh, sorry . EL will not report error if the *Utils* property not found in any one of the scope.
So, I think you cant deal with such idiom .



No problem, thanks for your reply.
11 years ago
My question was about catching this kind error.
11 years ago
Hello,

We are using JSP with Struts 1.2 and we had an invalid variable reference in the jsp page.
My question is: is there any chance to catch it later in the log or in any other else way ?



Thanks in advance.

Cs
11 years ago
Thanks Alberto,
I wanted to avoid this approach, one way or another it seems to be more elegant than other (if i want to get back more than one field)

In the end, i narrowed the query to one result field (user_id)

Thanks for your effort.

Cs.


Alberto Ivo wrote:the resultList method returns a List of objects.
If you do a cast, it returns a list of whatever you want

It will return a list of users.. If you want just the id and date.. You could do a UserVO object (for example). somthing like this:

And put this constructor in your query.

I hope it helps.
ivo.

Hello,

How can access the fields of the named query ?

I have a named query :



Which kind of object list must be created to store the result ?

Thanks in advance.
Hello,

I have a loop with db modifications and every loop ended with commit.

What if a commit throws exception ? As I know we must try to rollback.
But do we need to continue the loop ?

As for me I would exit from the function with a return false (after the connection.close) or what ever, forcing the further db modifications is pointles then.
Is this would be the best way or exists another ?

Thanks for your suggestion in advance.


Hello Guys!

First of all, I new to Android development, but I have Java programming experience.
I would like to make an 2D vector graphics software with following features, briefly:
- putting vector objects on the canvas or custom map
- resizing, moving objects
- scrolling the canvas and zooming

After understanding the basics of the Android development, what would be the best way to accomplish the fore mentioned application.
Using Canvas is enough or should I use libraries with or without OpenGl or maybe AndEngine ?

What would be the best choice or combination of possibilities ?

Thanks for the replies in advance.

Cs.
12 years ago
Thanks for your understandig

Paul Clapham wrote:Yes, "default" is not the most easy-to-understand word. If you think of it as meaning "use this if nothing else is available", that's probably closest to the way it is actually used.

Thanks for the reply for you too nice collection

Faisal Fuad wrote:Just few minutes ago i was reading about Rules of Constructors. Let me share that here...hopefully that will solve all the confusions related to it.

Rules for Constructors:

1. Constructors can use any access modifier, including private. (A private constructor means only code within the class itself can instantiate an object of that type, so if the private constructor class wants to allow an instance of the class to be used, the class must provide a static method or variable that allows access to an instance created from within the class.)
2. The constructor name must match the name of the class.
3. Constructors must not have a return type.
4. It’s legal (but stupid) to have a method with the same name as the class, but that doesn’t make it a constructor. If you see a return type, it’s a method rather than a constructor. In fact, you could have both a method and a constructor with the same namethe name of the classin the same class, and that’s not a problem for Java. Be careful not to mistake a method for a constructor, be sure to look for a return type.
5. If you don’t type a constructor into your class code, a default constructor will be automatically generated by the compiler.
6. The default constructor is ALWAYS a no-arg constructor.
7. If you want a no-arg constructor and you’ve typed any other constructor(s) into your class code, the compiler won’t provide the no-arg constructor for you. In other words, if you have typed in a constructor with arguments, you would not have a no-arg constructor unless you type it in yourself !
8. Every constructor has, as its first statement, either a call to an overloaded constructor (this()) or a call to the superclass constructor (super()), although remember that this call can be inserted by the compiler.
9. If you do type in a constructor (as opposed to relying on the compiler-generated default constructor), and you do not type in the call to super() or a call to this(), the compiler will insert a no-arg call to super() for you, as the very first statement in the constructor.
10. A call to super() can be either a no-arg call or can include arguments passed to the super constructor.
11. A no-arg constructor is not necessarily the default (i.e., compiler-supplied) constructor, although the default constructor is always a no-arg constructor. The default constructor is the one the compiler provides! While the default constructor is always a no-arg constructor, you’re free to put in your own noarg constructor.
12. You cannot make a call to an instance method, or access an instance variable, until after the super constructor runs.
13. Only static variables and methods can be accessed as part of the call to super() or this(). (Example: super(Animal.NAME) is OK, because NAME is declared as a static variable.)
14. Abstract classes have constructors, and those constructors are always called when a concrete subclass is instantiated.
15. Interfaces do not have constructors. Interfaces are not part of an object’s inheritance tree.
16. The only way a constructor can be invoked is from within another constructor.

From the above list, point number (7) is the most relevant asnwer for this particular problem set.

ok, thanks for your answer, i miss understood the meaning of "default", i take it like "always generated" - if it is not created.

Paul Clapham wrote:

Csaba Szegedi wrote:But the answer raises another question as well, why the compiller doesnt make an default constuctor for Marmaduke as well ?



The compiler will only generate a "default" constructor only if there isn't any other constructor. That's why it is called "default". In Marmaduke's case there is another constructor, so the compiler won't create a second one.

But the answer raises another question as well, why the compiller doesnt make an default constuctor for Marmaduke as well ?

Kaydell Leavitt wrote:Thanks for the help, but I still don't understand.

I'm not trying to create an instance of Cert, so why is its constructor being used at all?

Oh, I guess that I understand. The point is that even though I'm not constructing a Cert, the compiler creates a default constructor for it and in the default constructor, there is a call to super(), so the super-class must have a no-arg constructor.

Thanks. I think that I understand now. Right?

If you find an interesting java code example send me and I will add it my public codebank on IdeOne.

http://ideone.com/myforum/exam

It will be more commented and maintaned in the future.

gmail : cscsaba242
Hello,

Can somebody tell me why I got this error below ?

Cannot find class [org.test.vsdb0.UserService] for bean with name 'userService' defined in class path resource [applicationcontext.xml]

http://img560.imageshack.us/img560/779/image002d.png
http://pastebin.com/ysTt7nKB


How can I fix it ?

Thanks ahead.

Cs

12 years ago