Copying/renaming a Java class results in broken syntax in some cases

[nmatt]

Apache NetBeans version

Apache NetBeans 31

What happened

Copying or renaming a Java class results in broken syntax in certain cases, see the examples below.

The error appears to be related to the fact that the class name appears multiple times as type argument in the interface list.

Language / Project Type / NetBeans Component

Java, Editor, Refactoring

How to reproduce

Create the following Java interface in a non-default package:

package org.example;

interface Example extends Comparable<Example>, Iterable<Example>, Cloneable { }

Refactor-copy or refactor-rename the interface within the same package. The result is:

interface Example1 extends Comparable<Example1>,Iterable<Example1>, , Cloneable { }

Notice the extra comma (which breaks the syntax) and the missing space before "Iterable".

The analogous example with a class instead of an interface exhibits the same error.

Different variations of the faulty result happen with different spacing. For example, adding an extra space before "Iterable" results in (notice the "null"):

interface Example1 extends Comparable<Example1>,null  Iterable<Example1>, , Cloneable { }

Similarly, removing the space before "Iterable" results in:

interface Example1 extends Comparable<Example1>,nullIterable<Example1>, , Cloneable { }

Likewise, if the original uses multiple lines:

interface Example
extends
    Comparable<Example>,
    Iterable<Example>,
    Cloneable
{ }

the result is:

interface Example1
extends
    Comparable<Example1>,null
    Iterable<Example1>, ,
    Cloneable
{ }

Did this work correctly in an earlier version?

No / Don't know

Operating System

Windows

JDK

JDK 21

Apache NetBeans packaging

Apache NetBeans binary zip

Anything else

The issue doesn't appear to happen in the default package.

The issue already occurred in NetBeans 30.

Are you willing to submit a pull request?

No