[GROOVY-6123] Cannot use @CompileStatic with loop over Enumeration

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.8, 2.1.3
• Fix Version/s: 2.4.3
• Component/s: Static compilation
• Assignee: Cédric Champeau
• Reporter: Peter Ledbrook
• Created: 27/Apr/13 02:48
• Updated: 31/Mar/15 06:08
• Resolved: 20/Mar/15 09:54

Description

I'm seeing a compilation error with this code:

def zipFile = new ZipFile(self)
for (ZipArchiveEntry entry in zipFile.entries) {
    ...
}

The error:

lazybones/src/main/groovy/uk/co/cacoethes/util/ArchiveMethods.groovy: 36: [Static type checking] - Cannot loop with element of type org.apache.commons.compress.archivers.zip.ZipArchiveEntry with collection of type java.util.Enumeration <org.apache.commons.compress.archivers.zip.ZipArchiveEntry>
 @ line 36, column 9.
           for (ZipArchiveEntry entry in zipFile.entries) {
           ^
 
1 error

It seems that the static compilation doesn't like generic {{Enumeration}}s because this compiles file if I modify it slightly to look like:

def zipFile = new ZipFile(self)
for (ZipArchiveEntry entry in (zipFile.entries as List<ZipArchiveEntry>)) {
    ...
}

I have attached a sample Gradle project to demonstrate the problem. Simply unpack it into a fresh directory and run ./gradlew compileGroovy.

Issue Links

• is duplicated by: GROOVY-6240 static type checker cannot infer type of for loop variable from map