ensure all tests can be run together (avoid IllegalStateException from one set of tests killing JavaFX)

Author: daykin

app/ux-analytics/monitor/src/test/java/org/phoebus/applications/uxanalytics/monitor/backend/database/ServiceLayerConnectionTest.java

@@ -52,13 +52,12 @@ public class ServiceLayerConnectionTest {
 
     @BeforeAll
     public static void initJFX(){
-        Platform.startup(()->{});
-
-    }
-
-    @AfterAll
-    public static void tearDownJFX(){
-        Platform.exit();
+        try {
+            Platform.startup(() -> {});
+        }
+        catch (IllegalStateException e) {
+            // JFX already started
+        }
     }
 
     public void setupUI(){

app/ux-analytics/monitor/src/test/java/org/phoebus/applications/uxanalytics/monitor/representation/ActiveTabTest.java

@@ -46,13 +46,12 @@ public class ActiveTabTest {
     @BeforeAll
     public static void startJFX()
     {
-        Platform.startup(()->{});
-    }
-
-    @AfterAll
-    public static void stopJFX()
-    {
-        Platform.exit();
+        try {
+            Platform.startup(() -> {});
+        }
+        catch (IllegalStateException e) {
+            // JFX already started
+        }
     }
 
     @BeforeEach

app/ux-analytics/monitor/src/test/java/org/phoebus/applications/uxanalytics/monitor/representation/ActiveWindowsServiceTest.java

@@ -37,7 +37,12 @@ public class ActiveWindowsServiceTest {
 
     @BeforeAll
     static void setUp() {
-        Platform.startup(() -> {});
+        try {
+            Platform.startup(() -> {});
+        }
+        catch (IllegalStateException e) {
+            // JFX already started
+        }
         Platform.runLater(()->{
             app = new DisplayRuntimeApplication();
             stage = new Stage();
@@ -63,15 +68,6 @@ void reset() {
             activeWindowsService.clear();
     }
 
-    @AfterAll
-    static void tearDown() {
-        Platform.runLater(() ->{
-            if(stage!=null)
-                stage.close();
-        });
-        Platform.exit();
-    }
-
     @Test
     synchronized void testWindowIsPresentInActiveWindowsServiceWhenActive(){
         try {