Groovy Goodness: Adding Extra Methods Using Extension Modules
Groovy 2.0 brought us extension modules. An extension module is a JAR file with classes that provide extra methods to existing other classes like in the JDK or third-party libraries. Groovy uses this mechanism to add for example extra methods to the File class. We can implement our own extension module to add new extension methods to existing classes. Once we have written the module we can add it
Finding JAVA_HOME on Mac OSX
Today I had to built a legacy Java project on my MacBook, but my JAVA_HOME environment variable had to be defined as a Maven property. So I had to find my JAVA_HOME directory on my Mac OSX, which turned out to be very easy. We can simply use /usr/libexec/java_home and the result is the location of our JAVA_HOME on our computer. $ /usr/libexec/java_home /System/Library/Frameworks/JavaVM.framework/V
Groovy Goodness: Use a Class by Proxy
In the groovy.util package we find the Proxy class. We can use this class to create a proxy for another object. All methods calls to the proxy object are redirected to the original object, instead for the methods we override in the proxy class: class User { String name String email String password String displayName() { name } } class UserProxy extends groovy.util.Proxy { List fields // Override g
Groovy Goodness: Multiple Assignments Revisited
Multiple assignments in Groovy is something already covered before in the Groovy Goodness series. But today at the Gr8Conf I got some extra information about it's possibilities. First of all we can use type information in the multiple assignment. So we can assign the returning values to typed variables. The next thing is we can use multiple assignments basically for anything with a getAt method. A
Groovy Goodness: Configuring Grape to Use Classloader
Groovy has Grape to define dependencies which are necessary for our code to be downloaded by Ivy. This way we don't have to distribute third-party libraries with our code, but we only have to define the dependencies in our code. We can define these dependencies with the @Grab annotations. If we want to define multiple @Grab annotation we can group them together within a @Grapes annotation. By defa
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Groovy Goodness: Represent a List as String
Groovy Goodness: Create Class Instance Dynamically
Griffon Goodness: Getting the Current Running Mode
Groovy Goodness: Sorting a Map
Groovy Goodness: Use Keywords as Method Names
Groovy Goodness: Use Strings as Subscript Operator