How to include jars in a groovy script?

How to include jars in a groovy script?

To include external JAR files in a Groovy script, you can use the @Grab annotation or the GroovyClassLoader class to load and use classes from the JAR files. Here's how you can do both:

Using the @Grab Annotation (Grape):

The @Grab annotation, also known as Grape, is a convenient way to include external JAR files in a Groovy script. When you use @Grab, Groovy's Grape dependency manager automatically downloads and manages the JAR files for you.

Here's an example of how to use the @Grab annotation in your Groovy script:

@Grab(group='com.example', module='my-library', version='1.0')
import com.example.MyClass

def myInstance = new MyClass()
// Use myInstance and other classes from the JAR

In this example, replace com.example, my-library, and 1.0 with the actual coordinates (group, module, and version) of the JAR file you want to include.

To execute a Groovy script with @Grab dependencies, you can use the groovy command:

groovy your_script.groovy

Using the GroovyClassLoader:

If you want more fine-grained control over loading JAR files, you can use the GroovyClassLoader class to load classes from external JARs explicitly. Here's an example:

// Import GroovyClassLoader
import groovy.lang.GroovyClassLoader

// Create a GroovyClassLoader instance
def classLoader = new GroovyClassLoader()

// Add the external JAR to the classpath
classLoader.addURL(new File('/path/to/your.jar').toURI().toURL())

// Load and use classes from the JAR
def myClass = classLoader.loadClass('com.example.MyClass')
def myInstance = myClass.newInstance()

// Use myInstance and other classes from the JAR

In this example:

  • Replace /path/to/your.jar with the actual path to the JAR file you want to include.
  • loadClass() loads the class by name.
  • newInstance() creates an instance of the loaded class.

Using the GroovyClassLoader gives you more control but requires you to handle class loading and dependencies manually.

Choose the method that best fits your requirements and project setup. The @Grab annotation is a more straightforward approach for managing simple script dependencies, while the GroovyClassLoader provides greater flexibility when dealing with complex class loading scenarios.

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