#310 fix Java 8 errors (#312)

Author: stefan-ka

org.contextmapper.dsl/src/org/contextmapper/dsl/generator/PlantUMLGenerator.java

@@ -117,7 +117,7 @@ private List<Aggregate> getAggregatesWithStatesAndTransitions(BoundedContext bc)
 		for (Aggregate aggregate : EcoreUtil2.eAllOfType(bc, Aggregate.class)) {
 			Optional<org.contextmapper.tactic.dsl.tacticdsl.Enum> statesEnum = EcoreUtil2.eAllOfType(aggregate, org.contextmapper.tactic.dsl.tacticdsl.Enum.class).stream()
 					.filter(e -> e.isDefinesAggregateLifecycle()).findFirst();
-			if (statesEnum.isEmpty())
+			if (!statesEnum.isPresent())
 				continue;
 			List<StateTransition> stateTransitions = EcoreUtil2.eAllOfType(aggregate, StateTransition.class);
 			if (!stateTransitions.isEmpty())

org.contextmapper.dsl/src/org/contextmapper/dsl/generator/servicecutter/output/converter/ServiceCutterOutputToContextMappingModelConverter.java

@@ -316,7 +316,7 @@ private void reconstructReferencesIfPossible() {
 
 		for (String referenceNanoEntity : references2Reconstruct.keySet()) {
 			Optional<Reference> originalReference = originalReferences.stream().filter(r -> (((DomainObject) r.eContainer()).getName() + "." + r.getName()).equals(referenceNanoEntity)).findFirst();
-			if (originalReference.isEmpty())
+			if (!originalReference.isPresent())
 				continue;
 
 			reconstructReference(references2Reconstruct.get(referenceNanoEntity), originalReference.get(), originalReference.get().getDomainObjectType().getName());

org.contextmapper.dsl/src/org/contextmapper/dsl/refactoring/DeriveSubdomainFromUserRequirements.java

@@ -15,6 +15,7 @@
  */
 package org.contextmapper.dsl.refactoring;
 
+import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
@@ -64,7 +65,7 @@ protected void doRefactor() {
 		addElementsToEList(subdomain.getSupportedFeatures(), Lists.newLinkedList(selectedUserRequirements));
 		List<String> benefits = Lists.newLinkedList();
 		if (subdomain.getDomainVisionStatement() != null && !"".equals(subdomain.getDomainVisionStatement()))
-			benefits.addAll(List.of(subdomain.getDomainVisionStatement().split(BENEFIT_SEPARATOR_STRING)));
+			benefits.addAll(Arrays.asList(subdomain.getDomainVisionStatement().split(BENEFIT_SEPARATOR_STRING)));
 
 		for (UserRequirement ur : selectedUserRequirements) {
 			if (!doesContainAtLeastOneEntity(ur))