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I have a Groovy script in Eclipse and I get the following at the import statement:
Groovy:unable to resolve class org.apache.commons.lang.time.DateFormatUtils
When I add the external commons-lang-2.4.jar to the Libraries in the build path, the error message goes away. But if I remove it and instead add the external Class Folder that contains this and other jars, then I get the error message.
Try adding the jar by navigating to
Preferences->Java Build Path->Librariesand usingadd External JARs. I don’t believe Eclipse will pick up the various jar files in a folder for compilation – you may need to be explicit with each JAR, and I don’t think it supports wildcards for those as command-linejavacdoes these days. (See aspects of this answer for some treatment of this, and a potentially interesting plugin).