How to iterate filenames inside zipfile/warfile without creating /tmp/expandedArchives


We have a multimodule project in which we implemented some safeguards by creating a verifyWar target to check the generated warfile. This check runs for all the projects with apply our war.gradle


 * generic war configuration used by all modules which build wars
 * add to your project using:
 *     apply from: "$rootProject.projectDir/war.gradle"

apply plugin: 'war'

/* ... deleted irrelevant task definitions ... */

task verifyWar {
    def destFile = file("$buildDir/verifyWar.txt")
    dependsOn war
    inputs.file war.archivePath
    outputs.file destFile
    doLast {
        zipTree(war.archivePath).each { file ->
            assert ("some-forbidden.jar" !=
            assert ("some-forbidden-resource.xml" !=
        ant.echo(file: destFile, message:"verified at " + new Date())
war.finalizedBy verifyWar

What happens however is that every time verifyWar is run a .build/tmp/expandedArchives/myproject.war_{hash} is created.

Gradle doesn’t clean it up afterwards, so if a developer doesn’t run clean often enough the new war is unpacked and the expandedArchives directory grows with each deploy. Which for an active project can be 8~15 times a day.

A few questions:

  • Is there a flag on a zipFileTree that either make it clean up afterwards, or not expand at all?
  • Is there another way maybe to just iterate the filenames, not using ZipFileTree whatsoever?

I’m not sure if I can aggressively delete the expandedArchives directory as a whole as I also see dependencies from the war task such as from {zipFileTree (configurations.staticWebContent.archiveName} and others being expanded there. Basically whenever we use zipFileTree.

You can use for this purpose, but the name of each ZipEntry will be the full path, so you would need to handle that. Alternatively, there’s also war.eachFile { } which could be used to check all files going into the war as they’re written instead of after the fact.