groovy

error: incompatible types on Java stubs returning generics

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Description

The following class definition fails to compile the Java stubs:

class GenericReturn {
    public <T extends List> T foo() {
        null
    }
}

Error:

tmp/groovy-java-stubs/GenericReturn.java:16: error: incompatible types
public <T extends java.util.List> T foo() { return (java.util.List)null;}
                                                   ^
  required: T
  found:    List
  where T is a type-variable:
    T extends List declared in method <T>foo()

It compiles with no errors on 2.0-beta-2 and 1.8.6

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Alex Fulton added a comment - - edited

I am also getting this error on 1.8.7.

This code:

class Schedule<T extends ScheduleItem> extends HashSet<T> {
    (...)
    T getCurrentItem() {
        (...)
    }
}

Gives the error:

[ERROR] [...]\groovy-stubs\main\nz\ac\auckland\digitizer\scheduler\Schedule.java:[26,50] error: incompatible types
[ERROR] required: T
[ERROR] found:    ScheduleItem
[ERROR] where T is a type-variable:
[ERROR] T extends ScheduleItem declared in class Schedule

The offending line in the stub:

public  T getCurrentItem() { return (nz.ac.auckland.digitizer.scheduler.ScheduleItem)null;}

Doing a clean and rebuild in 1.8.6 with the same sources works fine.

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Alex Fulton added a comment - - edited I am also getting this error on 1.8.7. This code: class Schedule<T extends ScheduleItem> extends HashSet<T> { (...) T getCurrentItem() { (...) } } Gives the error: [ERROR] [...]\groovy-stubs\main\nz\ac\auckland\digitizer\scheduler\Schedule.java:[26,50] error: incompatible types [ERROR] required: T [ERROR] found: ScheduleItem [ERROR] where T is a type-variable: [ERROR] T extends ScheduleItem declared in class Schedule The offending line in the stub: public T getCurrentItem() { return (nz.ac.auckland.digitizer.scheduler.ScheduleItem)null;} Doing a clean and rebuild in 1.8.6 with the same sources works fine.
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Alex Fulton added a comment -

(also, the component for this issue should be stub generator, not compiler)

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Alex Fulton added a comment - (also, the component for this issue should be stub generator, not compiler)
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Alex Fulton added a comment -

Please note: the version field for this issue is misleading. This bug affects all versions of Groovy since 1.8.7, including 1.8.8 and 2.0.2. I am currently unable to upgrade to a newer version than 1.8.6 because my code will not compile in anything newer.

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Alex Fulton added a comment - Please note: the version field for this issue is misleading. This bug affects all versions of Groovy since 1.8.7, including 1.8.8 and 2.0.2. I am currently unable to upgrade to a newer version than 1.8.6 because my code will not compile in anything newer.
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Guillaume Laforge added a comment -

Covered also by GROOVY-5710 and GROVY-5630

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Guillaume Laforge added a comment - Covered also by GROOVY-5710 and GROVY-5630

People

  • Assignee:
    Guillaume Laforge
    Reporter:
    Renato Garcia
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Dates

  • Created:
    Updated:
    Resolved: