added compile deps

build.gradle

@@ -54,7 +54,7 @@ subprojects {
 dependencies{
 
     // https://mvnrepository.com/artifact/com.google.guava/guava
-    api group: 'com.google.guava', name: 'guava', version: '31.0.1-jre'
+    implementation group: 'com.google.guava', name: 'guava', version: '31.0.1-jre'
 
     // https://mvnrepository.com/artifact/org.jboss.netty/netty
     api group: 'org.jboss.netty', name: 'netty', version: '3.2.10.Final'