[GROOVY-5001] Map access is given higher precedence when trying to access fields/properties in classes which implement java.util.Map or extend java.util.HashMap or java.util.Properties

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.1, 1.8.2
• Fix Version/s: 5.0.0-alpha-1
• Component/s: groovy-runtime
• Labels: breaking

Environment

linux

[tauser02@gfmwsp11lds cps]$ uname -a
Linux gfmwsp11lds.hsi.hughessupply.com 2.6.18-164.el5 #1 SMP Thu Sep 3 04:15:13 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

[tauser02@gfmwsp11lds ~]$ groovy -v
Groovy Version: 1.8.2 JVM: 1.6.0_20

I also tried it on Groovy 1.8.1

• Assignee: Eric Milles
• Reporter: ericksn
• Created: 08/Sep/11 15:04
• Updated: 23/Aug/23 09:11
• Resolved: 25/Jan/22 18:21

Description

Using the @Log4j annotation on a groovy class that extends java.util.Properties seems to have odd side effects on closures.

testscript

import groovy.util.logging.*

[new Test1(), new Test2(), new Test3()].each {
    runTest(it)
}

def runTest (obj) {
    try {
         obj.test()
         obj.method()
         println "${obj.getClass()} success"
    }
    catch (e) {
         println "${obj.getClass()} failed $e"
    }
}

//   classes

@Log4j
class Test1 {
    def test () {
         println '============================='
         println 'testing plain Groovy class'
         println "testing class [${this.getClass().getSimpleName()}]"
    }
    def method () {
        log.debug 'method called, not in closure'
        ['a', 'b', 'c'].each {
            log.debug "inside closure [$it]"
        }
    }
}

@Log4j
class Test2 extends BaseClass {
    def test () {
         println '============================='
         println 'testing Groovy class that extends another Groovy class'
         println "testing class [${this.getClass().getSimpleName()}]"
    }
    def method () {
        log.debug 'method called, not in closure'
        ['a', 'b', 'c'].each {
            log.debug "inside closure [$it]"
        }
    }
}

class BaseClass {
}

@Log4j
class Test3 extends java.util.Properties {
    def test () {
         println '============================='
         println 'testing Groovy class that extends java.util.Properties'
         println "testing class [${this.getClass().getSimpleName()}]"
    }
    def method () {
        log.debug 'method called, not in closure'
        ['a', 'b', 'c'].each {
            log.debug "inside closure [$it]"
        }
    }
}

log4j.properties

log4j.rootLogger=DEBUG, CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d [%t] %-5p %c - %m%n

$ groovy testscript
=============================
testing plain Groovy class
testing class [Test1]
2011-09-08 15:59:45,757 [main] DEBUG Test1 - method called, not in closure
2011-09-08 15:59:45,759 [main] DEBUG Test1 - inside closure [a]
2011-09-08 15:59:45,759 [main] DEBUG Test1 - inside closure [b]
2011-09-08 15:59:45,759 [main] DEBUG Test1 - inside closure [c]
class Test1 success
=============================
testing Groovy class that extends another Groovy class
testing class [Test2]
2011-09-08 15:59:45,768 [main] DEBUG Test2 - method called, not in closure
2011-09-08 15:59:45,769 [main] DEBUG Test2 - inside closure [a]
2011-09-08 15:59:45,769 [main] DEBUG Test2 - inside closure [b]
2011-09-08 15:59:45,769 [main] DEBUG Test2 - inside closure [c]
class Test2 success
=============================
testing Groovy class that extends java.util.Properties
testing class [Test3]
2011-09-08 15:59:45,771 [main] DEBUG Test3 - method called, not in closure
class Test3 failed java.lang.NullPointerException: Cannot invoke method debug() on null object

The problem is on Test3 where the log instance var is null inside the closure, but not outside it.
Only Test 3 has this problem

Issue Links

• relates to: GROOVY-6144 Confusing treatment of m['foo'], m.get('foo'), m.foo, m.getFoo() for Maps
• relates to: GROOVY-8065 Map created as org.springframework.http.HttpHeaders is empty in 2.4.8, works fine in 2.4.7
• relates to: GROOVY-8074 @CompileStatic class property accessed instead of map property
• relates to: GROOVY-8555 The private keyword of an instance variable is causing a behavior change in a map class
• relates to: GROOVY-5491 HashMap subclass property access inconsistent
• relates to: GROOVY-662 Extending HashMap and adding JavaBean properties confuses Groovy