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Author Archives: Priyatam

Debugging MySQL ERROR1025 – Error on rename of

Tuesday, May 18, 2010

If you ever executed the following command in mysql: alter table table drop column; and got the following error: 1025 – Error on rename of ‘.\\#sql-880_3c’ to ‘.\\ ’ (errno: 150), Don’t panic. It’s probably because you’re trying to drop a column that’s a foreign key. Execute this command: SHOW ENGINE INNODB STATUS to debug more. [...]

Filed in Java | Comments (0)

Migrating from Hibernate 3.3.2, JPA 1 to Hibernate 3.5 CR2 and JPA 2

Monday, March 29, 2010

Starting with version 3.5 (currently CR2), Hibernate Annotations 3.x and Hibernate EntityManager projects have been merged into the Hibernate Core codebase as invidual modules. As a surprising addition, Hibernate Envers subproject is added as well (that’s a great thing as you get Auditing, out of box hereafter). So if you’re stuck with Hibernate 3.3.x and [...]

Filed in Hibernate, JPA, Java | Comments (0)

Accessing Drools 5 rules via a restful API using Drools Server and Groovy RestClient

Wednesday, December 2, 2009

If you haven’t heard about drools, you should have a look at it now. It provides multiple ways to write rules: DSL (drl files), groovy, java, excel spreadsheets or via a web interface (Guvnor). I recommend the book, Drools – JBoss Rules 5.0 by Michael Bali as its the only comprehensive documentation available on drools. [...]

Filed in Drools, Java | Comments (1)

an interesting class loading issue with quartz scheduler timing (NoClassDefFoundError)

Thursday, October 29, 2009

My quartz job schedulers had a startDelay of 0 ms and a repeatInterval of 10 mins and 5 mins each. On my local environment (win/mac) and sandbox (unix) the scheduler works just fine. But in our production environment (unix), we were getting spurious java.lang.NoClassDefFoundError: Could not initialize class Foo. Now Foo was one of the [...]

Filed in Java | Comments (0)

The best 59$, a java developer can ever invest

Wednesday, June 17, 2009

If you don’t buy this now, you’re either dumb. Or just plainly stupid. For the impatient: it’s a small jar that lets you compile/run/deploy java instantly, like php. I’ts the real HOT DEPLOY that jvm lacks out of the box. No more restarting the server, ever again, even after reconfiguring Spring beans. I used this [...]

Filed in Java | Comments (3)

JBoss Seam 2.1 Presentation at Java Meetup

Saturday, May 2, 2009

Here’s my presentation on JBoss Seam 2.1 from the Boston Java meetup group Introduction To JBoss Seam 2.1 View more presentations from Priyatam M.

Filed in Java, Seam | Comments (1)

Generic Entity Converter for JSF / Spring / JPA

Tuesday, April 28, 2009

If you’ve come across Seam’s <s:convertEntity> and wondered why isn’t one there for JSF, here you go: Before using this, you should’ve designed your domain model to extend a Base Class (do it, it’s a good practice). In my case, I have BaseIdentityEntity which has an @Id, @Version properties import java.io.Serializable; import javax.faces.component.UIComponent; import javax.faces.context.FacesContext; [...]

Filed in JSF, Spring, Tutorials | Comments (2)

our new rtc is up again!

Friday, April 24, 2009

Changed our servers to bluehost, our new rtc is up again!

Filed in Java | Comments (0)

JBoss Seam presentation at the Boston Java meetup group

Sunday, April 5, 2009

If you’re around the Boston Metro area, drop in for my presentation on JBoss Seam at the Boston Java Meetup group @MIT EHS office, Cambridge. Click here for more details.

Filed in Seam | Comments (0)

CAPTCHA Overview and alternatives

Monday, March 9, 2009

I recently evaluated CAPTCHA for a client requirement. Here is a brief overview (Source: blogs, wiki, white papers found on google search) CAPTCHA stands for: “Completely Automated Public Turing test to Tell Computers and Humans Apart”. It refers to a technology familiar to anyone who’s registered on a popular website – the “what word is [...]

Filed in Security, Web | Comments (0)