diff --git a/com.ibm.wala.cast.java.ecj/build.gradle b/com.ibm.wala.cast.java.ecj/build.gradle
index 58e35d020..6fada8c19 100644
--- a/com.ibm.wala.cast.java.ecj/build.gradle
+++ b/com.ibm.wala.cast.java.ecj/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'src'
+sourceSets.main.java.srcDirs = ['src']
 
 dependencies {
 	compile 'org.eclipse.jdt:org.eclipse.jdt.core:3.13.50'
diff --git a/com.ibm.wala.cast.java.test.data/build.gradle b/com.ibm.wala.cast.java.test.data/build.gradle
index 3cca1be44..7f8401357 100644
--- a/com.ibm.wala.cast.java.test.data/build.gradle
+++ b/com.ibm.wala.cast.java.test.data/build.gradle
@@ -3,7 +3,7 @@ plugins {
 	id 'de.undercouch.download' version '3.3.0'
 }
 
-sourceSets.test.java.srcDir 'src'
+sourceSets.test.java.srcDirs = ['src']
 
 
 ////////////////////////////////////////////////////////////////////////
diff --git a/com.ibm.wala.cast.java.test/build.gradle b/com.ibm.wala.cast.java.test/build.gradle
index ca9e41399..9c5ac00d6 100644
--- a/com.ibm.wala.cast.java.test/build.gradle
+++ b/com.ibm.wala.cast.java.test/build.gradle
@@ -2,7 +2,7 @@ plugins {
 	id 'com.github.hauner.jarTest' version '1.0.1'
 }
 
-sourceSets.test.java.srcDir 'src'
+sourceSets.test.java.srcDirs = ['src']
 
 dependencies {
 	testCompile 'junit:junit:4.11'
diff --git a/com.ibm.wala.cast.java/build.gradle b/com.ibm.wala.cast.java/build.gradle
index 0c79f5f01..89a920d5e 100644
--- a/com.ibm.wala.cast.java/build.gradle
+++ b/com.ibm.wala.cast.java/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'src'
+sourceSets.main.java.srcDirs = ['src']
 
 dependencies {
 	compile project(':com.ibm.wala.cast')
diff --git a/com.ibm.wala.cast.js.html.nu_validator/build.gradle b/com.ibm.wala.cast.js.html.nu_validator/build.gradle
index 94a0e7885..55a27cf29 100644
--- a/com.ibm.wala.cast.js.html.nu_validator/build.gradle
+++ b/com.ibm.wala.cast.js.html.nu_validator/build.gradle
@@ -1,8 +1,8 @@
 sourceSets {
-	main.java.srcDir 'src'
+	main.java.srcDirs = ['src']
 	test {
-		java.srcDir 'tests'
-		resources.srcDir project(':com.ibm.wala.cast.js.test.data').file('examples-src')
+		java.srcDirs = ['tests']
+		resources.srcDirs = [project(':com.ibm.wala.cast.js.test.data').file('examples-src')]
 	}
 }
 
diff --git a/com.ibm.wala.cast.js.nodejs.test/build.gradle b/com.ibm.wala.cast.js.nodejs.test/build.gradle
index 412a10419..138c33241 100644
--- a/com.ibm.wala.cast.js.nodejs.test/build.gradle
+++ b/com.ibm.wala.cast.js.nodejs.test/build.gradle
@@ -1,6 +1,6 @@
 sourceSets.test {
-	java.srcDir 'src'
-	resources.srcDir 'testdata'
+	java.srcDirs = ['src']
+	resources.srcDirs = ['testdata']
 }
 
 dependencies {
diff --git a/com.ibm.wala.cast.js.nodejs/build.gradle b/com.ibm.wala.cast.js.nodejs/build.gradle
index b0ef4226a..bb063b61f 100644
--- a/com.ibm.wala.cast.js.nodejs/build.gradle
+++ b/com.ibm.wala.cast.js.nodejs/build.gradle
@@ -1,6 +1,6 @@
 sourceSets.main {
-	java.srcDir 'src'
-	resources.srcDir 'dat'
+	java.srcDirs = ['src']
+	resources.srcDirs = ['dat']
 }
 
 dependencies {
diff --git a/com.ibm.wala.cast.js.rhino.test/build.gradle b/com.ibm.wala.cast.js.rhino.test/build.gradle
index f5a43f851..b9f43c466 100644
--- a/com.ibm.wala.cast.js.rhino.test/build.gradle
+++ b/com.ibm.wala.cast.js.rhino.test/build.gradle
@@ -2,7 +2,7 @@ plugins {
 	id 'com.github.hauner.jarTest' version '1.0.1'
 }
 
-sourceSets.test.java.srcDir 'harness-src'
+sourceSets.test.java.srcDirs = ['harness-src']
 
 dependencies {
 	testCompile 'junit:junit:4.11'
diff --git a/com.ibm.wala.cast.js.rhino/build.gradle b/com.ibm.wala.cast.js.rhino/build.gradle
index 9583f471b..ce61c9258 100644
--- a/com.ibm.wala.cast.js.rhino/build.gradle
+++ b/com.ibm.wala.cast.js.rhino/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'source'
+sourceSets.main.java.srcDirs = ['source']
 
 dependencies {
 	compile 'org.mozilla:rhino:1.7.7.1'
diff --git a/com.ibm.wala.cast.js.test/build.gradle b/com.ibm.wala.cast.js.test/build.gradle
index 90e235e53..5872bc422 100644
--- a/com.ibm.wala.cast.js.test/build.gradle
+++ b/com.ibm.wala.cast.js.test/build.gradle
@@ -2,7 +2,7 @@ plugins {
 	id 'com.github.hauner.jarTest' version '1.0.1'
 }
 
-sourceSets.test.java.srcDir 'harness-src'
+sourceSets.test.java.srcDirs = ['harness-src']
 
 dependencies {
 	testCompile 'junit:junit:4.11'
diff --git a/com.ibm.wala.cast.js/build.gradle b/com.ibm.wala.cast.js/build.gradle
index 1db2f4a0f..919ef31a1 100644
--- a/com.ibm.wala.cast.js/build.gradle
+++ b/com.ibm.wala.cast.js/build.gradle
@@ -1,6 +1,6 @@
 sourceSets.main {
-	java.srcDir 'source'
-	resources.srcDir 'dat'
+	java.srcDirs = ['source']
+	resources.srcDirs = ['dat']
 }
 
 dependencies {
diff --git a/com.ibm.wala.cast.test/build.gradle b/com.ibm.wala.cast.test/build.gradle
index 6d037db6a..a73f78504 100644
--- a/com.ibm.wala.cast.test/build.gradle
+++ b/com.ibm.wala.cast.test/build.gradle
@@ -4,7 +4,7 @@ plugins {
 
 apply plugin: 'cpp'
 
-sourceSets.test.java.srcDir 'harness-src/java'
+sourceSets.test.java.srcDirs = ['harness-src/java']
 
 dependencies {
 	testCompile 'junit:junit:4.11'
@@ -46,7 +46,7 @@ model {
 		xlator_test(NativeLibrarySpec) {
 			sources.cpp {
 				source {
-					srcDir 'harness-src/c'
+					srcDirs = ['harness-src/c']
 					include 'smoke.cpp'
 				}
 				generatedBy tasks.generateJniHeaders
@@ -69,7 +69,7 @@ model {
 		smoke_main(NativeExecutableSpec) {
 			sources.cpp {
 				source {
-					srcDir 'harness-src/c'
+					srcDirs = ['harness-src/c']
 					include 'smoke_main.cpp'
 				}
 				['cast', 'jdk'].each {
diff --git a/com.ibm.wala.cast/build.gradle b/com.ibm.wala.cast/build.gradle
index 2081319d2..4ea9760e4 100644
--- a/com.ibm.wala.cast/build.gradle
+++ b/com.ibm.wala.cast/build.gradle
@@ -1,6 +1,6 @@
 apply plugin: 'cpp'
 
-sourceSets.main.java.srcDir 'source/java'
+sourceSets.main.java.srcDirs = ['source/java']
 
 dependencies {
 	compile 'commons-io:commons-io:2.4'
@@ -38,10 +38,10 @@ model {
 			sources.cpp {
 				def cSourceDir = 'source/c'
 				source {
-					srcDir "$cSourceDir/jni"
+					srcDirs = ["$cSourceDir/jni"]
 					include '*.cpp'
 				}
-				exportedHeaders.srcDir "$cSourceDir/include"
+				exportedHeaders.srcDirs = ["$cSourceDir/include"]
 				lib library: 'jdk'
 			}
 			binaries.all {
diff --git a/com.ibm.wala.core.testdata/build.gradle b/com.ibm.wala.core.testdata/build.gradle
index 3e87b3b2b..5e55e8617 100644
--- a/com.ibm.wala.core.testdata/build.gradle
+++ b/com.ibm.wala.core.testdata/build.gradle
@@ -1 +1 @@
-sourceSets.test.java.srcDir 'src'
+sourceSets.test.java.srcDirs = ['src']
diff --git a/com.ibm.wala.core.tests/build.gradle b/com.ibm.wala.core.tests/build.gradle
index b8947e4bf..810c3c4aa 100644
--- a/com.ibm.wala.core.tests/build.gradle
+++ b/com.ibm.wala.core.tests/build.gradle
@@ -3,8 +3,8 @@ plugins {
 }
 
 sourceSets.test {
-	java.srcDir 'src'
-	resources.srcDir 'dat'
+	java.srcDirs = ['src']
+	resources.srcDirs = ['dat']
 }
 
 dependencies {
diff --git a/com.ibm.wala.core/build.gradle b/com.ibm.wala.core/build.gradle
index e1d53be24..ff3ba2dbf 100644
--- a/com.ibm.wala.core/build.gradle
+++ b/com.ibm.wala.core/build.gradle
@@ -1,5 +1,5 @@
 sourceSets.main {
-	java.srcDir 'src'
+	java.srcDirs = ['src']
 	resources.srcDirs = [
 		'dat',
 		'lib',
diff --git a/com.ibm.wala.dalvik.test/build.gradle b/com.ibm.wala.dalvik.test/build.gradle
index d529ea547..3987a4526 100644
--- a/com.ibm.wala.dalvik.test/build.gradle
+++ b/com.ibm.wala.dalvik.test/build.gradle
@@ -1,6 +1,6 @@
 sourceSets.test {
-	java.srcDir 'source'
-	resources.srcDir 'data'
+	java.srcDirs = ['source']
+	resources.srcDirs = ['data']
 }
 
 dependencies {
diff --git a/com.ibm.wala.dalvik/build.gradle b/com.ibm.wala.dalvik/build.gradle
index f8e1280e3..4ce0472a4 100644
--- a/com.ibm.wala.dalvik/build.gradle
+++ b/com.ibm.wala.dalvik/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'src'
+sourceSets.main.java.srcDirs = ['src']
 
 dependencies {
 	compile 'org.slf4j:slf4j-api:1.7.2'
diff --git a/com.ibm.wala.ide.jdt.test/build.gradle b/com.ibm.wala.ide.jdt.test/build.gradle
index 91b89f859..5f80cc10a 100644
--- a/com.ibm.wala.ide.jdt.test/build.gradle
+++ b/com.ibm.wala.ide.jdt.test/build.gradle
@@ -1,6 +1,6 @@
 sourceSets.test {
-	java.srcDir 'source'
-	resources.srcDir 'testdata'
+	java.srcDirs = ['source']
+	resources.srcDirs = ['testdata']
 }
 
 dependencies {
diff --git a/com.ibm.wala.ide.jdt/build.gradle b/com.ibm.wala.ide.jdt/build.gradle
index 90a64fb79..19367c6eb 100644
--- a/com.ibm.wala.ide.jdt/build.gradle
+++ b/com.ibm.wala.ide.jdt/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'source'
+sourceSets.main.java.srcDirs = ['source']
 
 dependencies {
 	compile 'org.eclipse.jdt:org.eclipse.jdt.core:3.13.50'
diff --git a/com.ibm.wala.ide.jsdt.tests/build.gradle b/com.ibm.wala.ide.jsdt.tests/build.gradle
index 6cac0c8f3..1b587d28d 100644
--- a/com.ibm.wala.ide.jsdt.tests/build.gradle
+++ b/com.ibm.wala.ide.jsdt.tests/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.test.java.srcDir 'src'
+sourceSets.test.java.srcDirs = ['src']
 
 dependencies {
 	testCompile 'junit:junit:4.11'
diff --git a/com.ibm.wala.ide.jsdt/build.gradle b/com.ibm.wala.ide.jsdt/build.gradle
index e7d993190..ab3b5996b 100644
--- a/com.ibm.wala.ide.jsdt/build.gradle
+++ b/com.ibm.wala.ide.jsdt/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'source'
+sourceSets.main.java.srcDirs = ['source']
 
 dependencies {
 	compile 'org.eclipse.core:org.eclipse.core.runtime:3.10.0.v20140318-2214'
diff --git a/com.ibm.wala.ide.tests/build.gradle b/com.ibm.wala.ide.tests/build.gradle
index 905ed5367..ffc1df546 100644
--- a/com.ibm.wala.ide.tests/build.gradle
+++ b/com.ibm.wala.ide.tests/build.gradle
@@ -2,7 +2,7 @@ plugins {
 	id 'com.github.hauner.jarTest' version '1.0.1'
 }
 
-sourceSets.test.java.srcDir 'src'
+sourceSets.test.java.srcDirs = ['src']
 
 dependencies {
 	testCompile 'org.eclipse.core:org.eclipse.core.runtime:3.10.0.v20140318-2214'
diff --git a/com.ibm.wala.ide/build.gradle b/com.ibm.wala.ide/build.gradle
index 198cdf09e..9af49627a 100644
--- a/com.ibm.wala.ide/build.gradle
+++ b/com.ibm.wala.ide/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'src'
+sourceSets.main.java.srcDirs = ['src']
 
 dependencies {
 	compile 'org.eclipse.pde:org.eclipse.pde.core:3.11.1'
diff --git a/com.ibm.wala.scandroid/build.gradle b/com.ibm.wala.scandroid/build.gradle
index 44cbef9b0..910177573 100644
--- a/com.ibm.wala.scandroid/build.gradle
+++ b/com.ibm.wala.scandroid/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'source'
+sourceSets.main.java.srcDirs = ['source']
 
 dependencies {
 	compile 'com.google.guava:guava:18.0'
diff --git a/com.ibm.wala.shrike/build.gradle b/com.ibm.wala.shrike/build.gradle
index 09e9c2ff4..6e9851bad 100644
--- a/com.ibm.wala.shrike/build.gradle
+++ b/com.ibm.wala.shrike/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'src'
+sourceSets.main.java.srcDirs = ['src']
 
 dependencies {
 	compile project(':com.ibm.wala.util')
diff --git a/com.ibm.wala.util/build.gradle b/com.ibm.wala.util/build.gradle
index a80552646..f510516b4 100644
--- a/com.ibm.wala.util/build.gradle
+++ b/com.ibm.wala.util/build.gradle
@@ -1,4 +1,4 @@
-sourceSets.main.java.srcDir 'src'
+sourceSets.main.java.srcDirs = ['src']
 
 tasks.javadoc {
 	def coreCompileJava = project(':com.ibm.wala.core').tasks.compileJava