Remove runtime as a dependency and add test lib

This change also simplifies the entrypoint in the func.yaml, so only the
user's function is referenced. All runtime related stuff is completely
abstracted away from the user.

fn/langs/java.go

@@ -20,7 +20,7 @@ type JavaLangHelper struct {
 func (lh *JavaLangHelper) BuildFromImage() string { return "maven:3.5-jdk-8-alpine" }
 
 // RunFromImage returns the Docker image used to run the Java function.
-func (lh *JavaLangHelper) RunFromImage() string { return "funcy/java" }
+func (lh *JavaLangHelper) RunFromImage() string { return "registry.oracledx.com/skeppare/jfaas-runtime:latest" }
 
 // HasPreBuild returns whether the Java runtime has boilerplate that can be generated.
 func (lh *JavaLangHelper) HasBoilerplate() bool { return true }
@@ -42,19 +42,27 @@ func (lh *JavaLangHelper) GenerateBoilerplate() error {
 		return err
 	}
 
-	helloJavaFunctionFileDir := filepath.Join(wd, "src/main/java/com/example/faas")
-	if err = os.MkdirAll(helloJavaFunctionFileDir, os.FileMode(0755)); err != nil {
-		os.Remove(pathToPomFile)
+	mkDirAndWriteFile := func(dir, filename, content string) error {
+		fullPath := filepath.Join(wd, dir)
+		if err = os.MkdirAll(fullPath, os.FileMode(0755)); err != nil {
+			return err
+		}
+
+		fullFilePath := filepath.Join(fullPath, filename)
+		return ioutil.WriteFile(fullFilePath, []byte(content), os.FileMode(0644))
+	}
+
+	err = mkDirAndWriteFile("src/main/java/com/example/faas", "HelloFunction.java", helloJavaSrcBoilerplate)
+	if err != nil {
 		return err
 	}
 
-	helloJavaFunctionFile := filepath.Join(helloJavaFunctionFileDir, "HelloFunction.java")
-	return ioutil.WriteFile(helloJavaFunctionFile, []byte(helloJavaFunctionBoilerplate), os.FileMode(0644))
+	return mkDirAndWriteFile("src/test/java/com/example/faas", "HelloFunctionTest.java", helloJavaTestBoilerplate)
 }
 
 // Entrypoint returns the Java runtime Docker entrypoint that will be executed when the function is executed.
-func (lh *JavaLangHelper) Entrypoint() string {
-	return "java -cp app/*:lib/* com.oracle.faas.runtime.EntryPoint com.example.faas.HelloFunction::handleRequest"
+func (lh *JavaLangHelper) Cmd() string {
+	return "com.example.faas.HelloFunction::handleRequest"
 }
 
 // DockerfileCopyCmds returns the Docker COPY command to copy the compiled Java function jar and dependencies.
@@ -70,8 +78,7 @@ func (lh *JavaLangHelper) DockerfileBuildCmds() []string {
 	return []string{
 		fmt.Sprintf("ENV MAVEN_OPTS %s", mavenOpts()),
 		"ADD pom.xml /function/pom.xml",
-		"RUN [\"mvn\", \"package\", \"dependency:go-offline\", \"-DstripVersion=true\", \"-Dmdep.prependGroupId=true\"," +
-			" \"dependency:copy-dependencies\"]",
+		"RUN [\"mvn\", \"package\", \"dependency:copy-dependencies\", \"-DincludeScope=runtime\", \"-DskipTests=true\", \"-Dmdep.prependGroupId=true\"]",
 		"ADD src /function/src",
 		"RUN [\"mvn\", \"package\"]",
 	}
@@ -130,7 +137,7 @@ const (
     </properties>
     <groupId>com.example.faas</groupId>
     <artifactId>hello</artifactId>
-    <version>1.0.0-SNAPSHOT</version>
+    <version>1.0.0</version>
 
     <repositories>
         <repository>
@@ -147,8 +154,15 @@ const (
         </dependency>
         <dependency>
             <groupId>com.oracle.faas</groupId>
-            <artifactId>runtime</artifactId>
+            <artifactId>testing</artifactId>
             <version>1.0.0-SNAPSHOT</version>
+            <scope>test</scope>
+        </dependency>
+		<dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
         </dependency>
     </dependencies>
 
@@ -168,7 +182,7 @@ const (
 </project>
 `
 
-	helloJavaFunctionBoilerplate = `package com.example.faas;
+	helloJavaSrcBoilerplate = `package com.example.faas;
 
 public class HelloFunction {
 
@@ -178,5 +192,29 @@ public class HelloFunction {
         return "Hello, " + name + "!";
     }
 
+}`
+
+	helloJavaTestBoilerplate = `package com.example.faas;
+
+import com.oracle.faas.testing.FnTesting;
+import org.junit.*;
+
+import static org.junit.Assert.*;
+import static com.oracle.faas.testing.FnTesting.*;
+
+public class HelloFunctionTest {
+
+    @Rule
+    public final FnTesting testing = FnTesting.createDefault();
+
+    @Test
+    public void shouldReturnGreeting() {
+        testing.givenEvent().enqueue();
+        testing.thenRun(HelloFunction.class, "handleRequest");
+
+        FnResult result = testing.getOnlyResult();
+        assertEquals("Hello, world!", result.getBodyAsString());
+    }
+
 }`
 )