Find Answers For ... - Recent questions tagged java

What is thread join in java?

Sun, 17 Nov 2013 05:33:56 +0000

Why we need to use thread join. Why it is necessary..

How old would you be if you didn’t know how old you are?

Wed, 06 Nov 2013 03:38:05 +0000

How old would you be if you didn’t know how old you are?

How to know if a field is null or zero, since resultset.getLong() or getInt() method always returns zero

Wed, 07 Aug 2013 06:50:30 +0000

I have a field called site_visitors in a table whose data type is number.

When i try to retrieve using below query, it returns zero though the field is empty.

Long siteVisitors=rs.getLong("site_visitors");

if I print,

System.out.println("siteVisitors:"+siteVisitors)

Outputs always 0.

My question, how to know if siteVisitors is empty or zero in table ?

Getting error "Dangling meta character '?' near index 0 ? ^" when i run my java program

Tue, 27 Nov 2012 06:22:26 +0000

Did you ever see the error message like this when you run your script

"Dangling meta character '?' near index 0 ? ^"

I am getting the above error, if anybody faced this and resolved earlier, please let me know how to fix this issue.

can we change the logging level of log4j at runtime?

Wed, 18 Jul 2012 09:50:08 +0000

i have an issue, i want to change the logging level of log4j at runtime, i have tried many things with log4j.properties file, i have also tried to written a code which after particular time again reads the properties file and again configure the logger.

but the problem is, i want to change the logging level to DEBUG for one API call, and then when that call is completed, the logger should again change to the previous value..

please help..

HashMap vs Hashtable

Fri, 27 Apr 2012 08:35:06 +0000

what is the difference between 
HashMap vs Hashtable Which is best to Use

User authentication on a Jersey REST service

Fri, 06 Jan 2012 05:46:16 +0000

I am currently developing a REST application, which is using the Jersey framework. I would like to know a way that I can control user authentication. I have search a lot of places, and the closest article I have found is this: http://weblogs.java.net/blog/2008/03/07/authentication-jersey.

However this article can only be used whith a GlassFish server and a attached database. Is there anyway that I can implement an interface in Jersey and use it as a filter before reaching the requested REST resource?

I want to use basic authentication right now, but it should be flexible enough such that I can change that at a later time.

Thanks in Advance Stefan.

What is stored on Stack and Heap ?

Sat, 12 Nov 2011 17:05:29 +0000

Hi all,

Can anyone tell me what is stored on a stack and what is stored on a heap in a Java program?

Thanks.