Comments for Nikos' Java blog

Comment on SCJP 6 Mock exam for Threads by Cris

Cris — Mon, 09 Nov 2009 19:37:53 +0000

First of all – good job.

Look again at question 8 – I believe 3 methods (not 2) are static there.

Comment on SCJP 6 Mock exam for I/O by S

Mon, 09 Nov 2009 04:18:09 +0000

Thanx for the questions, keep up good work

Comment on Free SCWCD Mock Exam for EL by priya

priya — Thu, 05 Nov 2009 02:04:59 +0000

Thanks for the questions.Quite interesting.

Comment on Free SCWCD Mock Exam for Servlets by Ankit Garg

Ankit Garg — Fri, 30 Oct 2009 07:15:08 +0000

priya, the RequestDispatcher.forward method throws ServletException but the HttpServletResponse.sendRedirect doesn’t throw ServletException…

Comment on Free SCWCD Mock Exam for Servlets by Ankit Garg

Ankit Garg — Fri, 30 Oct 2009 06:20:49 +0000

Answer of question 45 also seems wrong to me…

Comment on Free SCWCD Mock Exam for Servlets by Ankit Garg

Ankit Garg — Fri, 30 Oct 2009 06:18:18 +0000

I think the answer of question 50 is wrong.

In question 62, the question would be more exact if there was a URL representing the requested servlet which performs the redirect as the path in sendRedirect is relative.

Similarly in question 63, I would recommend that you wrote that the application is deployed on a context path (whatever it may be) as the answer would be wrong if the application was deployed on root or default context path…

Comment on SCJP Mock exam for Generics by The true about the question 72??

The true about the question 72?? — Fri, 23 Oct 2009 23:55:39 +0000

Hi everyone

In question 72 the correct answer is b), i don’t know the exact reason; I supposed is a name colide because i tried to compile and the result is:

non-static class String cannot be referenced from a static context

Thanks for your time

Comment on SCJP Mock exam for Collections by Alex Serna

Alex Serna — Thu, 22 Oct 2009 14:24:34 +0000

Thank you. Excellent Job!!!

Comment on JBoss integration with JDeveloper 11g by MEDO

MEDO — Sun, 18 Oct 2009 11:27:17 +0000

please if you please
send me any VIDEO of jdeveloper 11g
Thanks yours

Comment on Wicket: Full guide for NetBeans 6.5 by dana

dana — Sat, 17 Oct 2009 18:33:57 +0000

@Vic – it should work for Netbeans, with the specifications, not in Eclipse!

Comment on Free SCWCD Mock Exam for Custom Tags by Vishwa

Vishwa — Wed, 14 Oct 2009 09:49:36 +0000

Hi ! An excellent quiz. Makes familiarizing with code very easy!

Thanks!

*qn 37: isnt it a valid TLD declaration? is optional rite?

Comment on Free SCWCD Mock Exam for Servlets by priya

priya — Thu, 10 Sep 2009 17:11:53 +0000

Hello…….

I get confused in qu.29 and qu.30. In 29 code gets fails as it require that servlet should throw ServletException then is that not needed for qu.30..
please help me…

Comment on SCJP Mock exam for Overriding & Overloading by Pranjal

Pranjal — Thu, 10 Sep 2009 12:49:37 +0000

thanks for the good & free practice material:-)

Comment on JDBC in 10 minutes by Emeric

Emeric — Tue, 08 Sep 2009 20:21:53 +0000

@Nikos
Excellent, it was just clear and complete. Thanks.
Every architect / senior developer shoud know this, without jpa / spring or apache of course. Because it helps to know how and when to use them.

Comment on Easy JDBC using Spring by Colin Sampaleanu

Colin Sampaleanu — Fri, 04 Sep 2009 16:25:28 +0000

Niko,

With respect to showing the basic usage model of JdbcTemplate, your sample is fine. However, you really should not be managing the DataSource yourself in this fashion, but rather injecting it into your DAO class. Then it can be a Spring managed object, and the user of the DAO can plug in whatever connection pool DataSource variant (e.g. Apache Commons DBCP) makes sense…

Colin

Comment on Free SCWCD Mock Exam for Custom Tags by Bindu

Bindu — Thu, 03 Sep 2009 09:00:57 +0000

Qn 68 : returning SKIP_PAGE from doStartTag()
evaluates the body?
How so?
Please explain?
And make corrections in question 52 and 53.You are defining a method with in a method in them.

Comment on Free SCWCD Mock Exam for JSPs by Bindu

Bindu — Tue, 01 Sep 2009 03:08:49 +0000

I could not understand why we get null in second page in question 46.
If the attribute is in session scope as in question 47 we don’t get null.

Comment on JDBC in 10 minutes by Spencer K

Spencer K — Mon, 31 Aug 2009 20:37:41 +0000

Spring JDBC is also quite usable even when not using the dependency injection associated with Spring.

Comment on JDBC in 10 minutes by Tony

Tony — Mon, 31 Aug 2009 20:05:44 +0000

I would highly recommend against using raw JDBC anymore. Check out Apache DBUtils and DBCP if you like staying close to JDBC. Also check out the JPA.

Comment on JDBC in 10 minutes by rip747

rip747 — Mon, 31 Aug 2009 17:43:47 +0000

i just vomited in my mouth. why would you want to write all that code when there are numerous orms for java out there?

Comment on Easy JDBC using Spring by Twitter Trackbacks for Easy JDBC using Spring « Nikos’ Java blog [nikojava.wordpress.com] on Topsy.com

Mon, 31 Aug 2009 03:24:14 +0000

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Comment on Free SCWCD Mock Exam for Servlets by Daisy

Daisy — Sun, 30 Aug 2009 10:50:27 +0000

Amit,
you mean qn 70?
Yes. When session is invalidated then the attribute removed is called.
Here attribute removed is not called when the statement: request.getSession().removeAttribute(“planet”);
is executed but when the session is invalidated.

Comment on Easy JDBC using Spring by JDBC in 10 minutes « Nikos’ Java blog

JDBC in 10 minutes « Nikos’ Java blog — Sat, 29 Aug 2009 11:56:46 +0000

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Comment on MySQL in 3 minutes by Easy JDBC using Spring « Nikos’ Java blog

Easy JDBC using Spring « Nikos’ Java blog — Sat, 29 Aug 2009 11:04:31 +0000

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Comment on MySQL in 3 minutes by JDBC in 10 minutes « Nikos’ Java blog

JDBC in 10 minutes « Nikos’ Java blog — Sat, 29 Aug 2009 10:54:58 +0000

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Comment on SCJP 6 Mock exam for I/O by Ashok

Ashok — Sat, 08 Aug 2009 21:01:18 +0000

Good one !! Hats off to you Niko !!

Comment on Free SCJP Mock exams by Alex

Alex — Sat, 08 Aug 2009 06:43:58 +0000

Here is another good site for scjp exam preparation: http://scjptest.com Hope it helps.

Comment on Hibernate in 10 minutes by Nuno

Nuno — Wed, 01 Jul 2009 23:52:04 +0000

I really appreciate your blog.
This is really useful and there should be more articles like this one on other subjects, ideally one single place where we could find similar summaries for other technologies.

Well done!

Comment on MySQL in 3 minutes by Tagz | "MySQL in 3 minutes « Nikos’ Java blog" | Comments

Tagz | "MySQL in 3 minutes « Nikos’ Java blog" | Comments — Sat, 16 May 2009 16:57:53 +0000

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Comment on Custom Tags Tutorial by Free SCWCD Mock exam for Custom Tags « Nikos’ Java blog

Free SCWCD Mock exam for Custom Tags « Nikos’ Java blog — Sat, 09 May 2009 17:31:09 +0000

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Comment on SCJP Mock exam for Collections by Pedro Parra

Pedro Parra — Sun, 26 Apr 2009 17:36:42 +0000

The answer for the question 25 should be c, -12 11 0 145

Comment on Hibernate in 10 minutes by maneesh kumar sinha

maneesh kumar sinha — Sat, 25 Apr 2009 18:13:37 +0000

Very nice tutorial.
One question
Can we handle auto increment (mysql) using annotation without declaring primary key as auto increment.? In other words what could be replacement /equivalent for in my entity calss

Comment on Free SCJP Mock exams by Mock Exam Link « SCJP 6 Notes

Mock Exam Link « SCJP 6 Notes — Sun, 19 Apr 2009 17:38:30 +0000

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Comment on SCJP Mock exam for Generics by unexpected compilation error with Generics : java cms

unexpected compilation error with Generics : java cms — Wed, 15 Apr 2009 04:11:19 +0000

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Comment on SCJP Mock exam for Generics by ajith

ajith — Sun, 12 Apr 2009 06:27:28 +0000

hi Niko,,,
thanks a lot …. i really enjoyed with these questions …
well done

Comment on SCJP Mock exam for Generics by Paolo

Paolo — Fri, 10 Apr 2009 09:06:51 +0000

Hi, thanks for this!

Questions 23 and 24 and respective answers are identical. Is it intended?

Comment on Free SCJP Mock exams by good link for sample scjp questions : java cms

good link for sample scjp questions : java cms — Fri, 10 Apr 2009 04:08:02 +0000

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Comment on Free SCJP Mock exams by SCJP 5/SCJP 6 Mock Exam and Practice Questions Review « javaGod

SCJP 5/SCJP 6 Mock Exam and Practice Questions Review « javaGod — Thu, 09 Apr 2009 17:21:14 +0000

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Comment on JavaFX Script for Java developers, Part 1 by красивый

красивый — Tue, 31 Mar 2009 09:32:52 +0000

Очень полезная вещь, спасибо!!

Comment on Free SCWCD Mock Exam for Servlets by Amit

Amit — Fri, 27 Mar 2009 19:37:21 +0000

Can someone explain me why in Q 71, the answer will be (B). I dont understand now since the session is invalidated, how can i remove any attributes from it. The session doesnt exists ?? So how can an attribute be still there ?

Comment on SCJP 6 Mock exam for Threads by Michał B

Michał B — Fri, 27 Mar 2009 11:24:03 +0000

Hi all.
I would like to explain in short some questions:
q58 – you have 2 independent methods “setNumber” and “getNumber”, two threads cannot get into one of them in the same time becouse of synchronization, this is clear, but line “account.setNumber(account.getNumber() + 1);” is unsafe becouse two threads may read the same number (getNumber()) (one thread get into method, read value and release lock, then second thread get into the same method and read the same value) then both tread wants to set their values (setNumber), so You dont have quarantee that the sequence will be: getNumber, setNumber, getNumber, setNumber… it can be: getNumber, getNumber, setNumber,setNumber

q60: – in this example You have quarantee sequence, read and set value (increment)

q66: – when the thread is dead (ended run method) it release lock (if thread end his work before main thread run wait method program will be wait for all)

g67: – similar to above example, when thread run notify method and go out from synchronized block main thread wake up, but You have to know that You imply that the thread will finish his work after main method run wait method on thread object.

I hope this help somone. Best regards

Comment on SCJP 6 Mock exam for I/O by MisiekB

MisiekB — Thu, 26 Mar 2009 17:28:17 +0000

Question nr 28 is correct. The final variable is initialized in constructor so all is good. You have 3 places where can You initialize final variable:
1) in declaration
2) init block
3) constructor

Comment on Free SCJP Mock exams by Michał B

Michał B — Thu, 26 Mar 2009 13:05:28 +0000

Good job Nikos. Thanks for it. Take care

Comment on SCJP Mock exam for Generics by Ahsan Jamshaid

Ahsan Jamshaid — Mon, 23 Mar 2009 11:24:01 +0000

Hi Niko,
this is really excellent stuff. i liked it and i really appreciate your effort.

Thanks Buddy!..

Comment on Free SCWCD Mock Exam for Servlets by Nikos

Nikos — Sun, 22 Mar 2009 10:39:50 +0000

Hi Francis,

Of course you can access the ServletContext from any ServletConfig (see question 7). However it’s the ServletContext that holds context init parameters!

Comment on Free SCWCD Mock Exam for Servlets by Francis

Francis — Thu, 19 Mar 2009 16:00:09 +0000

Hi Niko,

Thanks for the mock.
A question, why does #16 have B as answer?
I would say A, because you can access ServletContext from the ServletConfig, so in fact ServletConfig has a ServletContext object.

Comment on Free SCWCD Mock Exam for Servlets by Milton

Milton — Tue, 17 Mar 2009 23:06:17 +0000

I get it,

the method parameters are inverted (HttpSevletResponse, HttpSevletRequest).

I will be most focus on that stuff

Thanks again.

Comment on Free SCWCD Mock Exam for Servlets by Nikos

Nikos — Tue, 17 Mar 2009 21:26:38 +0000

Have you used the exact code of the question?

Comment on Free SCWCD Mock Exam for Servlets by Milton

Milton — Tue, 17 Mar 2009 19:51:22 +0000

what do you mean directly accesed?

I test this question with a html file, and the POST method is called normally.

Tonight I will test accesing through a JSP, but i think that the answer will be the same!

Comment on Free SCWCD Mock Exam for Servlets by Nikos

Nikos — Tue, 17 Mar 2009 19:43:45 +0000

Hi Milton! The answer would be GET if the servlet was directly accessed. But here, it is accessed through a JSP…