diff --git a/lib/.gitignore b/lib/.gitignore
index 622aa9700..7756d33c4 100644
--- a/lib/.gitignore
+++ b/lib/.gitignore
@@ -25,4 +25,4 @@ nbdist/
 .nb-gradle/
 
 ### DEV-TOOLS ###
-.checkstyle
\ No newline at end of file
+.checkstyle
diff --git a/lib/taskana-core/src/main/java/pro/taskana/impl/TaskServiceImpl.java b/lib/taskana-core/src/main/java/pro/taskana/impl/TaskServiceImpl.java
index 6fd28b969..e1f24c7b8 100644
--- a/lib/taskana-core/src/main/java/pro/taskana/impl/TaskServiceImpl.java
+++ b/lib/taskana-core/src/main/java/pro/taskana/impl/TaskServiceImpl.java
@@ -159,27 +159,24 @@ public class TaskServiceImpl implements TaskService {
         LOGGER.debug("entry to createTask(task = {})", taskToCreate);
         try {
             taskanaEngineImpl.openConnection();
-            try {
-                this.getTaskById(taskToCreate.getId());
-                throw new TaskAlreadyExistException(taskToCreate.getId());
-            } catch (TaskNotFoundException ex) {
-                LOGGER.debug("Task {} can´t be be found, so it can be created.", taskToCreate.getId());
-            }
             TaskImpl task = (TaskImpl) taskToCreate;
-            workbasketService.getWorkbasket(task.getWorkbasketId());
-            workbasketService.checkAuthorization(task.getWorkbasketId(), WorkbasketAuthorization.APPEND);
-            Classification classification = task.getClassification();
-            if (classification == null) {
-                throw new ClassificationNotFoundException(null);
+            if (task.getId() != "" && task.getId() != null) {
+                throw new TaskAlreadyExistException(taskToCreate.getId());
+            } else {
+                LOGGER.debug("Task {} can´t be be found, so it can be created.", taskToCreate.getId());
+                workbasketService.getWorkbasket(task.getWorkbasketId());
+                workbasketService.checkAuthorization(task.getWorkbasketId(), WorkbasketAuthorization.APPEND);
+                Classification classification = task.getClassification();
+                if (classification == null) {
+                    throw new ClassificationNotFoundException(null);
+                }
+                taskanaEngine.getClassificationService().getClassification(classification.getKey(),
+                    classification.getDomain());
+
+                standardSettings(task);
+                this.taskMapper.insert(task);
+                LOGGER.debug("Method createTask() created Task '{}'.", task.getId());
             }
-            taskanaEngine.getClassificationService().getClassification(classification.getKey(),
-                classification.getDomain());
-
-            standardSettings(task);
-
-            this.taskMapper.insert(task);
-
-            LOGGER.debug("Method createTask() created Task '{}'.", task.getId());
             return task;
         } finally {
             taskanaEngineImpl.returnConnection();
diff --git a/lib/taskana-core/src/test/java/pro/taskana/impl/TaskServiceImplTest.java b/lib/taskana-core/src/test/java/pro/taskana/impl/TaskServiceImplTest.java
index deb4b7bda..b4405eedd 100644
--- a/lib/taskana-core/src/test/java/pro/taskana/impl/TaskServiceImplTest.java
+++ b/lib/taskana-core/src/test/java/pro/taskana/impl/TaskServiceImplTest.java
@@ -109,7 +109,7 @@ public class TaskServiceImplTest {
         ClassificationNotFoundException, ClassificationAlreadyExistException, TaskAlreadyExistException,
         TaskNotFoundException {
         TaskServiceImpl cutSpy = Mockito.spy(cut);
-        TaskImpl expectedTask = createUnitTestTask("1", "DUMMYTASK", "1");
+        TaskImpl expectedTask = createUnitTestTask("", "DUMMYTASK", "1");
         WorkbasketImpl wb = new WorkbasketImpl();
         wb.setId("1");
         wb.setName("workbasket");
@@ -120,7 +120,6 @@ public class TaskServiceImplTest {
         Task actualTask = cutSpy.createTask(expectedTask);
 
         verify(taskanaEngineImpl, times(1)).openConnection();
-        verify(cutSpy, times(1)).getTaskById(any());
         verify(workbasketServiceMock, times(1)).checkAuthorization(any(), any());
         verify(workbasketServiceMock, times(1)).getWorkbasket(any());
         verify(taskanaEngineMock, times(1)).getClassificationService();
@@ -151,7 +150,7 @@ public class TaskServiceImplTest {
         WorkbasketImpl wb = new WorkbasketImpl();
         wb.setId("1");
         wb.setName("workbasket");
-        TaskImpl expectedTask = createUnitTestTask("1", "DUMMYTASK", wb.getId());
+        TaskImpl expectedTask = createUnitTestTask(null, "DUMMYTASK", wb.getId());
         expectedTask.setPrimaryObjRef(expectedObjectReference);
         Classification classification = expectedTask.getClassification();
         doThrow(TaskNotFoundException.class).when(cutSpy).getTaskById(expectedTask.getId());
@@ -163,7 +162,6 @@ public class TaskServiceImplTest {
         Task actualTask = cutSpy.createTask(expectedTask);
 
         verify(taskanaEngineImpl, times(1)).openConnection();
-        verify(cutSpy, times(1)).getTaskById(any());
         verify(workbasketServiceMock, times(1)).getWorkbasket(wb.getId());
         verify(workbasketServiceMock, times(1)).checkAuthorization(wb.getId(), WorkbasketAuthorization.APPEND);
         verify(taskanaEngineMock, times(1)).getClassificationService();
@@ -197,7 +195,7 @@ public class TaskServiceImplTest {
         wb.setId("1");
         wb.setName("workbasket");
         doReturn(wb).when(workbasketServiceMock).getWorkbasket(wb.getId());
-        TaskImpl expectedTask = createUnitTestTask("1", "DUMMYTASK", "1");
+        TaskImpl expectedTask = createUnitTestTask("", "DUMMYTASK", "1");
         expectedTask.setPrimaryObjRef(expectedObjectReference);
         Classification classification = expectedTask.getClassification();
         doThrow(TaskNotFoundException.class).when(cutSpy).getTaskById(expectedTask.getId());
@@ -211,7 +209,6 @@ public class TaskServiceImplTest {
         expectedTask.getPrimaryObjRef().setId(actualTask.getPrimaryObjRef().getId());   // get only new ID
 
         verify(taskanaEngineImpl, times(1)).openConnection();
-        verify(cutSpy, times(1)).getTaskById(any());
         verify(workbasketServiceMock, times(1)).getWorkbasket(expectedTask.getWorkbasketId());
         verify(workbasketServiceMock, times(1)).checkAuthorization(expectedTask.getWorkbasketId(),
             WorkbasketAuthorization.APPEND);
@@ -274,9 +271,8 @@ public class TaskServiceImplTest {
         cutSpy.createTask(task2);
 
         verify(taskanaEngineImpl, times(2)).openConnection();
-        verify(cutSpy, times(2)).getTaskById(any());
-        verify(workbasketServiceMock, times(2)).checkAuthorization(any(), any());
         verify(workbasketServiceMock, times(2)).getWorkbasket(any());
+        verify(workbasketServiceMock, times(2)).checkAuthorization(any(), any());
         verify(taskanaEngineMock, times(2)).getClassificationService();
         verify(classificationServiceMock, times(2)).getClassification(any(), any());
         verify(objectReferenceMapperMock, times(2)).findByObjectReference(expectedObjectReference);
@@ -312,7 +308,6 @@ public class TaskServiceImplTest {
             cutSpy.createTask(task);
         } catch (TaskAlreadyExistException ex) {
             verify(taskanaEngineImpl, times(1)).openConnection();
-            verify(cutSpy, times(1)).getTaskById(task.getId());
             verify(taskanaEngineImpl, times(1)).returnConnection();
             verifyNoMoreInteractions(taskanaEngineConfigurationMock, taskanaEngineMock, taskanaEngineImpl,
                 taskMapperMock, objectReferenceMapperMock, workbasketServiceMock,
@@ -326,7 +321,7 @@ public class TaskServiceImplTest {
         throws NotAuthorizedException, WorkbasketNotFoundException, ClassificationNotFoundException,
         TaskAlreadyExistException, TaskNotFoundException {
         TaskServiceImpl cutSpy = Mockito.spy(cut);
-        TaskImpl task = createUnitTestTask("1", "dummyTask", "1");
+        TaskImpl task = createUnitTestTask("", "dummyTask", "1");
         doThrow(TaskNotFoundException.class).when(cutSpy).getTaskById(task.getId());
         doThrow(NotAuthorizedException.class).when(workbasketServiceMock).checkAuthorization(task.getWorkbasketId(),
             WorkbasketAuthorization.APPEND);
@@ -334,7 +329,6 @@ public class TaskServiceImplTest {
             cutSpy.createTask(task);
         } catch (NotAuthorizedException e) {
             verify(taskanaEngineImpl, times(1)).openConnection();
-            verify(cutSpy, times(1)).getTaskById(task.getId());
             verify(workbasketServiceMock, times(1)).getWorkbasket(task.getWorkbasketId());
             verify(workbasketServiceMock, times(1)).checkAuthorization(task.getWorkbasketId(),
                 WorkbasketAuthorization.APPEND);
@@ -351,14 +345,13 @@ public class TaskServiceImplTest {
         throws NotAuthorizedException, WorkbasketNotFoundException, ClassificationNotFoundException,
         TaskAlreadyExistException, TaskNotFoundException {
         TaskServiceImpl cutSpy = Mockito.spy(cut);
-        TaskImpl task = createUnitTestTask("1", "dumma-task", "1");
+        TaskImpl task = createUnitTestTask("", "dumma-task", "1");
         doThrow(TaskNotFoundException.class).when(cutSpy).getTaskById(task.getId());
         doThrow(WorkbasketNotFoundException.class).when(workbasketServiceMock).getWorkbasket(any());
         try {
             cutSpy.createTask(task);
         } catch (WorkbasketNotFoundException e) {
             verify(taskanaEngineImpl, times(1)).openConnection();
-            verify(cutSpy, times(1)).getTaskById(task.getId());
             verify(workbasketServiceMock, times(1)).getWorkbasket(task.getWorkbasketId());
             verify(taskanaEngineImpl, times(1)).returnConnection();
             verifyNoMoreInteractions(taskanaEngineConfigurationMock, taskanaEngineMock, taskanaEngineImpl,
diff --git a/lib/taskana-core/src/test/java/pro/taskana/impl/integration/TaskServiceImplIntAutocommitTest.java b/lib/taskana-core/src/test/java/pro/taskana/impl/integration/TaskServiceImplIntAutocommitTest.java
index f20efb4d2..ddcd213a9 100644
--- a/lib/taskana-core/src/test/java/pro/taskana/impl/integration/TaskServiceImplIntAutocommitTest.java
+++ b/lib/taskana-core/src/test/java/pro/taskana/impl/integration/TaskServiceImplIntAutocommitTest.java
@@ -231,7 +231,7 @@ public class TaskServiceImplIntAutocommitTest {
         classificationService.createClassification(dummyClassification);
 
         TaskImpl dummyTask = (TaskImpl) taskServiceImpl.newTask();
-        dummyTask.setId("1");
+        dummyTask.setId(null);
         dummyTask.setName("Dummy-Task");
         dummyTask.setClassification(dummyClassification);
         dummyTask.setWorkbasketId(dummyWorkbasket.getId());
@@ -397,7 +397,7 @@ public class TaskServiceImplIntAutocommitTest {
         }
 
         // Check failing with missing TRANSFER
-        task.setId(UUID.randomUUID().toString());
+        task.setId("");
         task.setWorkbasketId(wbNoTransfer.getId());
         task = (TaskImpl) taskServiceImpl.createTask(task);
         try {
diff --git a/lib/taskana-core/src/test/java/pro/taskana/impl/integration/TaskServiceImplIntExplicitTest.java b/lib/taskana-core/src/test/java/pro/taskana/impl/integration/TaskServiceImplIntExplicitTest.java
index 833d483ff..4260eba29 100644
--- a/lib/taskana-core/src/test/java/pro/taskana/impl/integration/TaskServiceImplIntExplicitTest.java
+++ b/lib/taskana-core/src/test/java/pro/taskana/impl/integration/TaskServiceImplIntExplicitTest.java
@@ -473,7 +473,7 @@ public class TaskServiceImplIntExplicitTest {
         }
 
         // Check failing with missing TRANSFER
-        task.setId(UUID.randomUUID().toString());
+        task.setId("");
         task.setWorkbasketId(wbNoTransfer.getId());
         task = (TaskImpl) taskServiceImpl.createTask(task);
         try {