Merge pull request #15208 from jdaugherty/issue15129

Author: jdaugherty

grails-gradle/model/src/main/groovy/grails/io/IOUtils.groovy

@@ -194,9 +194,12 @@ class IOUtils extends SpringIOUtils {
             String rootPath = classRes.toString() - pathToClassFile
             if (rootPath.endsWith(BuildSettings.BUILD_CLASSES_PATH)) {
                 rootPath = rootPath.replace('/build/classes/groovy/', '/build/resources/')
-            } else {
+            }
+
+            if (!rootPath.endsWith('/')) {
                 rootPath = "$rootPath/"
             }
+
             return new URL(rootPath)
         }
         return null

grails-gradle/model/src/test/groovy/grails/io/IOUtilsSpec.groovy

@@ -21,7 +21,7 @@ package grails.io
 import org.grails.io.support.Resource
 import spock.lang.Specification
 
-class IOUtilsSpec extends Specification{
+class IOUtilsSpec extends Specification {
 
     void "Test findClassResource finds a class resource"() {
         expect:
@@ -34,4 +34,13 @@ class IOUtilsSpec extends Specification{
         IOUtils.findJarResource(Specification)
         IOUtils.findJarResource(Specification).path.endsWith('spock-core-2.3-groovy-3.0.jar!/')
     }
+
+    void 'findRootResourcesURL - appends / if not present'() {
+        when:
+        def result = IOUtils.findRootResourcesURL(IOUtils).toString()
+
+        then:
+        result.startsWith('file:')
+        result.endsWith('/')
+    }
 }