Decouple examples from service

The purpose of this PR is to decouple the user's workflows from being
built into the workflow-service by using the PropertiesLauncher as the
Start-Class of the application.

Extra dependencies can be provided via system property `loader.path`.
In addition, to satisfy all runtime dependencies, the workflow-example
is being built with a plugin to include all of its dependencies in a
single jar.

Signed-off-by: Moti Asayag <masayag@redhat.com>

workflow-examples/pom.xml

@@ -112,6 +112,25 @@
                     <reportFormat>html</reportFormat>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <version>3.5.0</version>
+                <configuration>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>assemble-all</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>

workflow-examples/start_workflow_service.sh

@@ -1 +1,3 @@
-java -jar -Dspring.profiles.active=local ../workflow-service/target/workflow-service-1.0.3-SNAPSHOT.jar
+java -jar -Dspring.profiles.active=local \
+    -Dloader.path=../workflow-examples/target/workflow-examples-1.0.3-SNAPSHOT-jar-with-dependencies.jar \
+    ../workflow-service/target/workflow-service-1.0.3-SNAPSHOT.jar

workflow-service/pom.xml

@@ -126,11 +126,6 @@
             <artifactId>workflow-engine</artifactId>
             <version>${revision}</version>
         </dependency>
-        <dependency>
-            <groupId>dev.parodos</groupId>
-            <artifactId>workflow-examples</artifactId>
-            <version>${revision}</version>
-        </dependency>
         <!-- END Parodos Library Dependencies -->
         <!-- START Developer Productivity Dependencies -->
         <dependency>
@@ -214,6 +209,9 @@
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
                 <version>${springframework.boot.version}</version>
+                <configuration>
+                    <layout>ZIP</layout>
+                </configuration>
                 <executions>
                     <execution>
                         <goals>

workflow-service/start_workflow_service.sh

@@ -1 +1,3 @@
-java -jar -Dspring.profiles.active=local target/workflow-service-1.0.3-SNAPSHOT.jar
+java -jar -Dspring.profiles.active=local \
+    -Dloader.path=../workflow-examples/target/workflow-examples-1.0.3-SNAPSHOT-jar-with-dependencies.jar \
+    target/workflow-service-1.0.3-SNAPSHOT.jar