refactor(retrofit2): move java classes from main/groovy/.. to main/ja…

…va/.. in echo-notifications

echo-notifications/echo-notifications.gradle

@@ -18,7 +18,6 @@ dependencies {
   implementation project(':echo-core')
   implementation project(':echo-model')
   implementation project(":echo-pipelinetriggers")
-  implementation project(":echo-test")
   implementation "org.springframework.boot:spring-boot-starter-web"
   implementation "com.squareup.retrofit2:retrofit"
   implementation "com.squareup.retrofit2:converter-jackson"
@@ -35,6 +34,7 @@ dependencies {
   implementation "io.cloudevents:cloudevents-http-basic:3.0.0"
   implementation "io.cloudevents:cloudevents-json-jackson:3.0.0"
   implementation ("dev.cdevents:cdevents-sdk-java:0.3.1")
+  testImplementation project(":echo-test")
   testImplementation("com.icegreen:greenmail:1.5.14") {
     exclude group: "com.sun.mail", module: "javax.mail"
   }
@@ -45,3 +45,10 @@ dependencies {
   testImplementation "com.github.tomakehurst:wiremock-jre8"
   annotationProcessor "org.springframework.boot:spring-boot-configuration-processor"
 }
+
+sourceSets {
+  main {
+    java { srcDirs = [] }    // no source dirs for the java compiler
+    groovy { srcDirs = ["src/main/java", "src/main/groovy"] }  // compile everything in src/ with groovy
+  }
+}