[GROOVY-10902] Dynamic constants for primitive types get default value in Java

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.14, 4.0.7
• Fix Version/s: 3.0.15, 4.0.8
• Component/s: Stub generator / Joint compiler
• Assignee: Eric Milles
• Reporter: Onni Koskinen
• Created: 13/Jan/23 10:12
• Updated: 18/Apr/23 18:47
• Resolved: 17/Jan/23 16:41

Description

If we define a constant that is resolved during runtime in a Groovy class and reference it in a Java class, it's value gets a static default value in the Java class. This seems to be a regression in Groovy 3.0.10 as earlier versions don't have the problem. Also affects all 4.0.x versions that I tested.

Example:

// G.groovy
class G {
    public static final int DYNAMIC_CONSTANT = (9.9).intValue()
} 

// J.java
public class J {
    public static void main(String[] args) {
        System.out.println(G.DYNAMIC_CONSTANT);
    }
} 

Groovy 4.0.7
Prints 0 with the following bytecode for J#main

0: getstatic     #2 // Field java/lang/System.out:Ljava/io/PrintStream;
3: iconst_0
4: invokevirtual #4 // Method java/io/PrintStream.println:(I)V
7: return

Groovy 3.0.9
Correctly prints 9 with the following bytecode:

0: getstatic     #2 // Field java/lang/System.out:Ljava/io/PrintStream;
3: getstatic     #3 // Field G.DYNAMIC_CONSTANT:I
6: invokevirtual #4 // Method java/io/PrintStream.println:(I)V
9: return 

 

 

Issue Links

• is related to: GROOVY-10611 Static fields not initialized when accessed from another class
• relates to: GROOVY-10928 Invalid stub code for interface field
• relates to: GROOVY-11019 joint compilation: public static final string does not compile