Use java-library plugin for Java modules.

bramble-api/build.gradle

-apply plugin: 'java'
+apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
 apply plugin: 'witness'
 
 dependencies {
-	compile "com.google.dagger:dagger:2.0.2"
-	compile 'com.google.code.findbugs:jsr305:3.0.2'
+	implementation "com.google.dagger:dagger:2.0.2"
+	implementation 'com.google.code.findbugs:jsr305:3.0.2'
 
-	testCompile 'junit:junit:4.12'
-	testCompile "org.jmock:jmock:2.8.2"
-	testCompile "org.jmock:jmock-junit4:2.8.2"
-	testCompile "org.jmock:jmock-legacy:2.8.2"
-	testCompile "org.hamcrest:hamcrest-library:1.3"
-	testCompile "org.hamcrest:hamcrest-core:1.3"
+	testImplementation 'junit:junit:4.12'
+	testImplementation "org.jmock:jmock:2.8.2"
+	testImplementation "org.jmock:jmock-junit4:2.8.2"
+	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
 }
 
 dependencyVerification {

bramble-core/build.gradle

-apply plugin: 'java'
+apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
@@ -7,14 +7,20 @@ apply plugin: 'idea'
 apply plugin: 'witness'
 
 dependencies {
-	compile project(path: ':bramble-api', configuration: 'default')
-	compile 'com.madgag.spongycastle:core:1.58.0.0'
-	compile 'com.h2database:h2:1.4.192' // This is the last version that supports Java 1.6
-	compile 'org.bitlet:weupnp:0.1.4'
+	implementation project(path: ':bramble-api', configuration: 'default')
+	implementation 'com.madgag.spongycastle:core:1.58.0.0'
+	implementation 'com.h2database:h2:1.4.192' // This is the last version that supports Java 1.6
+	implementation 'org.bitlet:weupnp:0.1.4'
 
 	apt 'com.google.dagger:dagger-compiler:2.0.2'
 
-	testCompile project(path: ':bramble-api', configuration: 'testOutput')
+	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
+	testImplementation 'junit:junit:4.12'
+	testImplementation "org.jmock:jmock:2.8.2"
+	testImplementation "org.jmock:jmock-junit4:2.8.2"
+	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
 
 	testApt 'com.google.dagger:dagger-compiler:2.0.2'
 }

bramble-j2se/build.gradle

-apply plugin: 'java'
+apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
@@ -7,14 +7,21 @@ apply plugin: 'idea'
 apply plugin: 'witness'
 
 dependencies {
-	compile project(path: ':bramble-core', configuration: 'default')
-	compile fileTree(dir: 'libs', include: '*.jar')
-	compile 'net.java.dev.jna:jna:4.4.0'
-	compile 'net.java.dev.jna:jna-platform:4.4.0'
+	implementation project(path: ':bramble-core', configuration: 'default')
+	implementation fileTree(dir: 'libs', include: '*.jar')
+	implementation 'net.java.dev.jna:jna:4.4.0'
+	implementation 'net.java.dev.jna:jna-platform:4.4.0'
 
 	apt 'com.google.dagger:dagger-compiler:2.0.2'
 
-	testCompile project(path: ':bramble-core', configuration: 'testOutput')
+	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
+	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
+	testImplementation 'junit:junit:4.12'
+	testImplementation "org.jmock:jmock:2.8.2"
+	testImplementation "org.jmock:jmock-junit4:2.8.2"
+	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
 }
 
 dependencyVerification {

briar-android/build.gradle

@@ -38,10 +38,17 @@ dependencies {
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
+	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
 	testImplementation 'org.robolectric:robolectric:3.5.1'
 	testImplementation 'org.robolectric:shadows-support-v4:3.0'
 	testCompile 'org.mockito:mockito-core:2.8.9'
+	testImplementation 'junit:junit:4.12'
+	testImplementation "org.jmock:jmock:2.8.2"
+	testImplementation "org.jmock:jmock-junit4:2.8.2"
+	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
 }
 
 dependencyVerification {

briar-api/build.gradle

-apply plugin: 'java'
+apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
 apply plugin: 'witness'
 
 dependencies {
-	compile project(path: ':bramble-api', configuration: 'default')
+	implementation project(path: ':bramble-api', configuration: 'default')
 }
 
 dependencyVerification {

briar-core/build.gradle

-apply plugin: 'java'
+apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
@@ -7,18 +7,24 @@ apply plugin: 'idea'
 apply plugin: 'witness'
 
 dependencies {
-	compile project(path: ':briar-api', configuration: 'default')
-	compile 'com.rometools:rome:1.7.3'
-	compile 'org.jdom:jdom2:2.0.6'
-	compile 'com.squareup.okhttp3:okhttp:3.8.0'
-	compile 'org.jsoup:jsoup:1.10.3'
+	implementation project(path: ':briar-api', configuration: 'default')
+	implementation 'com.rometools:rome:1.7.3'
+	implementation 'org.jdom:jdom2:2.0.6'
+	implementation 'com.squareup.okhttp3:okhttp:3.8.0'
+	implementation 'org.jsoup:jsoup:1.10.3'
 
 	apt 'com.google.dagger:dagger-compiler:2.0.2'
 
-	testCompile project(path: ':bramble-core', configuration: 'default')
-	testCompile project(path: ':bramble-core', configuration: 'testOutput')
-	testCompile project(path: ':bramble-api', configuration: 'testOutput')
-	testCompile 'net.jodah:concurrentunit:0.4.2'
+	testImplementation project(path: ':bramble-core', configuration: 'default')
+	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
+	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
+	testImplementation 'net.jodah:concurrentunit:0.4.2'
+	testImplementation 'junit:junit:4.12'
+	testImplementation "org.jmock:jmock:2.8.2"
+	testImplementation "org.jmock:jmock-junit4:2.8.2"
+	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
 
 	testApt 'com.google.dagger:dagger-compiler:2.0.2'
 }