diff --git a/BCEL/build.gradle b/BCEL/build.gradle
index b29885f..9b9bef0 100644
--- a/BCEL/build.gradle
+++ b/BCEL/build.gradle
@@ -4,7 +4,10 @@ plugins {
 
 group = 'de.repmek.tools.BCEL'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '1.8'
+
+java {
+	sourceCompatibility = JavaVersion.VERSION_1_8
+}
 
 dependencies {
 	implementation 'org.apache.bcel:bcel:6.9.0'
diff --git a/JNI/build.gradle b/JNI/build.gradle
index ac49491..aa5e7c4 100644
--- a/JNI/build.gradle
+++ b/JNI/build.gradle
@@ -4,11 +4,16 @@ plugins {
 	id 'cpp'
 }
 
-mainClassName = 'de.repmek.jni.SayHello'
+application {
+	mainClass = 'de.repmek.jni.SayHello'
+}
 
 group = 'de.repmek.tools.JNI'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '1.8'
+
+java {
+	sourceCompatibility = JavaVersion.VERSION_1_8
+}
 
 println "Building on OS: " + System.properties['os.name']
 println "Using JDK: " + System.properties['java.home']
diff --git a/backtracking/build.gradle b/backtracking/build.gradle
index 0e212f7..b3141f1 100644
--- a/backtracking/build.gradle
+++ b/backtracking/build.gradle
@@ -4,7 +4,10 @@ plugins {
 
 group = 'de.repmek.tools.backtracking'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '1.8'
+
+java {
+	sourceCompatibility = JavaVersion.VERSION_1_8
+}
 
 dependencies {
 
diff --git a/build.gradle b/build.gradle
index 9937826..d1fe5e2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,13 +1,13 @@
 buildscript {
     repositories {
         mavenCentral()
-        jcenter()
+        google()
     }
 }
 
 allprojects {
     repositories {
         mavenCentral()
-        jcenter()
+        google()
     }
 }
\ No newline at end of file
diff --git a/compression/build.gradle b/compression/build.gradle
new file mode 100644
index 0000000..e5a7139
--- /dev/null
+++ b/compression/build.gradle
@@ -0,0 +1,15 @@
+plugins {
+	id 'java'
+}
+
+group = 'de.repmek.compression'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	sourceCompatibility = JavaVersion.VERSION_17
+}
+
+dependencies {
+	testImplementation 'org.junit.jupiter:junit-jupiter-api:5.10.2'
+	testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.10.2'
+}
diff --git a/jzos_batch/build.gradle b/jzos_batch/build.gradle
index 000245b..98779aa 100644
--- a/jzos_batch/build.gradle
+++ b/jzos_batch/build.gradle
@@ -4,7 +4,10 @@ plugins {
 
 group = 'de.repmek.tools.JZos'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '1.8'
+
+java {
+	sourceCompatibility = JavaVersion.VERSION_1_8
+}
 
 dependencies {
 	implementation files('libs/jzos.jar')
diff --git a/settings.gradle b/settings.gradle
index cb840b8..d2b59e4 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -5,3 +5,4 @@ include 'backtracking'
 include 'jzos_batch'
 include 'JNI'
 include 'xmp'
+include 'compression'
diff --git a/xmp/build.gradle b/xmp/build.gradle
index 1014f09..da9ff43 100644
--- a/xmp/build.gradle
+++ b/xmp/build.gradle
@@ -4,7 +4,10 @@ plugins {
 
 group = 'de.repmek.xmp'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '1.8'
+
+java {
+	sourceCompatibility = JavaVersion.VERSION_1_8
+}
 
 dependencies {
 	implementation 'com.adobe.xmp:xmpcore:6.1.11'