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Groovy: Multiple Values for a Single Command-line Option

One of the many features that makes Groovy an attractive scripting language is its built-in command-line argument support via CliBuilder. I have written about CliBuilder before in the posts Customizing Groovy’s CliBuilder Usage Statements and Explicitly Specifying ‘args’ Property with Groovy CliBuilder. In this post, I look at Groovy‘s CliBuilder’s support for multiple arguments passed via a single command-line flag. ...

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Groovy JDK (GDK): Date and Calendar

I have looked at some highly useful methods available in Groovy GDK‘s extensions to the Java JDK in blog posts such as Groovy JDK (GDK): File.deleteDir(), Groovy JDK (GDK): Text File to String, Groovy JDK (GDK): More File Fun, Groovy JDK (GDK): String Support, and Groovy JDK (GDK): Number Support. In this post, I look at some of the endearing ...

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A very light Groovy based web application project template

A very light Groovy based web application project template You might have heard of the project Grails is a Groovy version of Ruby on Rails like framework that let you create web application much more easier with Dynamic scripting. Despite all that power Grails provided, it is not ‘light’ if you look under the hood. I am not saying Grails ...

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Scripted Reports with Groovy

Groovy has become my favorite scripting language and in this blog I look at some of Groovy’s features that make it particularly attractive for presenting text-based reports. The post will show how custom text-based reports of data stored in the database can be easily presented with Groovy. I will highlight several attractive features of Groovy along the way. I use ...

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Grails SQL Logging part 2 – groovy.sql.Sql

I discussed options for logging Hibernate-generated SQL in an earlier post but today I was trying to figure out how to see the SQL from groovy.sql.Sql and didn’t have much luck at first. The core problem is that the Sql class uses a java.util.logging.Logger (JUL) while the rest of the world uses a Log4j logger (often with a Commons Logging or SLF4J ...

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Grails: Autodiscovery of JPA-annotated domain classes

There are some issues to be fixed with the support for adding JPA annotations (for example @Entity) to Groovy classes in grails-app/domain in 2.0. This is due to the changes made to adding most GORM methods to the domain class bytecode with AST transformations instead of adding them to the metaclass at runtime with metaprogramming. There is a workaround – ...

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Quartz 2: Exploring different scheduling types

We often think of Cron when we want to schedule a job. Cron is very flexible in expressing an repeating occurance of an event/job in a very compact expression. However it’s not answer for everything, as I often see people are asking for help in the Quartz user forum. Did you know that the popular Quartz 2 library provide many ...

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Logging Hibernate SQL

There are two well-known ways to log Hibernate SQL in Grails; one is to add logSql = true in DataSource.groovy (either in the top-level block for all environments or per-environment)             dataSource { dbCreate = ... url = ... ... logSql = true } and the other is to use a Log4j logging configuration: log4j ...

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JavaOne 2012: What’s New in Groovy 2.0

Guillaume Laforge’s (SpringSource/VMware/@glaforge) ‘What’s New in Groovy 2.0’ presentation was in the same conference room (Hilton Golden Gate 6/7/8) as Martin Odersky’s ‘What’s New in Scala 2.10‘ presentation, but I decided to leave the room between these sessions for three reasons: You tend to get kicked out of a room before the next session anyway to ensure that registered individuals ...

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