Groovy JDK classes not supported by default

[JE-coding]

I use the configuration:

• Windows 10
• a fresh installed Eclipse Version: 2019-12 (4.14.0) running on Java 12 JDK
• Groovy Development Tools 3.7.0.SNAPSHOT
• Groovy Compiler Version 3.0.1

A simple Groovy script, created in a new Groovy Project:

def d = new Date();
println d + 1

results in:
caught: groovy.lang.MissingMethodException: No signature of method: java.util.Date.plus() is applicable for argument types: (Integer) values: [1] Possible solutions: parse(java.lang.String), is(java.lang.Object), split(groovy.lang.Closure), use([Ljava.lang.Object;), wait(), clone()

When I switch to Groovy Compiler Version 2.4.1.8, the Groovy script is running correctly and shows the expected result!

After the compiler switch, the Eclipse windows are destroyed (errors like "Failed to create the parts controls", "Invalid registry object", read crosses) but I can reopen them.

The same problem happens for Java8 or Eclipse 4.8.0 or Compiler Level 2.5.9.

I guess this as a bug. I would expect that the plugin supports the Groovy JDK classes by default.

Thank You!

[eric-milles]

This is because Groovy 2.5 broke up the groovy-all jar into multiple jars. If you want to use the DGM "plus(Date, int)", you need to add groovy-dateutil library to your project or to your ~/.groovy/lib/ directory.

[eric-milles]

The "Invalid Registry Object" is a known issue. I have a workaround: #981 (comment) and I have a fix that is yet to be merged: https://git.eclipse.org/r/#/c/155098/

[JE-coding]

Thanks for the fast answer :-)
For me it was quite frustrating that I was not able to simply run such an easy Groovy snipplet. It would be nice if there would be the same default-support for the Groovy libraries as in the GroovyConsole application.

[eric-milles]

I think the maintainers of Groovy are trying to push a switch to DateTime from Date. The extension methods for DateTime are present out of the box.