I was working with some Groovy scripts in IntelliJ today – a first for me. I came up against a couple of simple getting-started issues… I’m just making notes about them here. There are notes here on two errors I came across: “Unable to resolve class” and “Configure Groovy SDK”.

1. “Configure Groovy SDK”:

• On command line:
  • This: brew install groovy
  • Then to run a script: groovy path/to/file.groovy
• In IntelliJ:
  • Install the groovy plugin
  • Open the folder containing the scripts
  • When it says “Groovy SDK is not configured for module ‘my-module’” or “Configure Groovy SDK”
    • Click the link with the “Configure Groovy SDK” message (top right in IntelliJ)
    • Click Create
    • (Find your Groovy installation:
      • On the command line: brew ls groovy
      • This will give you something like this: /usr/local/Cellar/groovy/2.5.2/bin/groovy
      • Then you need to find your libexec folder – probably at same level as bin folder – in my case it’s here: /usr/local/Cellar/groovy/2.5.2/libexec)
    • Find the libexec folder, select it and click open
    • More here: https://stackoverflow.com/questions/46123890/configuring-groovy-sdk-within-intellij-idea
  • Now you can run a Groovy script by clicking the big green Play button, top right
  • To pass parameters into a script:
    • Top right, click the little down arrow next to the name of the script
    • Click Edit configurations
    • Fill in Program arguments

2. “Unable to resolve class” 

• This can happen when your classes are in a package and you try to run your script from the command line.
• It will start in the folder the class is in, then from there it will look for a further folder structure – eg if your package is clare.is.cool then it will look for the folder structure clare/is/cool from the path of the groovy script.
• The solution is to set the classpath on the command line when running the script, and start further back in the directory tree.
  • For instance if your class is here: c:\overall\path\clare\is\cool\MyScript.groovy
  • Then you run it like this: groovy -cp c:\overall\path c:\overall\path\clare\is\cool\MyScript.groovy
  • (or if you have already navigated to c:\overall\path\clare\is\cool, you can just run groovy -cp c:\overall\path MyScript.groovy)

More here: https://stackoverflow.com/questions/45072923/groovy-unable-to-resolve-class

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