[GROOVY-2582] cannot extend java.util.Properties unless getProperty() is overridden

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.5.4
• Fix Version/s: 1.6-rc-1, 1.5.8, 1.7-beta-1
• Component/s: ast builder
• Environment: Windows 2000, JDK 1.6, Groovy 1.5.4
• Assignee: Jochen Theodorou
• Reporter: Erik Bartels
• Created: 05/Feb/08 10:24
• Updated: 03/Dec/08 19:00
• Resolved: 03/Dec/08 19:00

Description

Running this in groovyconsole

public class Configuration extends java.util.Properties 
{  
    
}  
1

yields the following error:

Exception thrown: org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed, 
Script9: -1: the return type is incompatible with java.lang.String getProperty(java.lang.String) in 
java.util.Properties. Node: org.codehaus.groovy.ast.MethodNode. At [-1:-1]  @ line -1, column -1.

But when the getProperty() method is overridden the code runs fine:

public class Configuration extends java.util.Properties 
{  
    String getProperty(String s) {
    }
} 
1