GH-1018: added NPE checks, since it is expected that the live data might not be around when calling this

Author: martinlippert

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/livehover/v2/SpringProcessCommandHandler.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2019, 2024 Pivotal, Inc.
+ * Copyright (c) 2019, 2025 Pivotal, Inc.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -341,15 +341,15 @@ private CompletableFuture<Object> handleLiveMetricsProcessRequest(ExecuteCommand
 			switch(metricName) {
 				case SpringProcessConnectorService.GC_PAUSES: {
 					SpringProcessGcPausesMetricsLiveData data = connectorService.getGcPausesMetricsLiveData(processKey);
-					return CompletableFuture.completedFuture(data.getGcPausesMetrics());
+					return data != null ? CompletableFuture.completedFuture(data.getGcPausesMetrics()) : CompletableFuture.failedFuture(new IllegalStateException("Live Metrics Data is not yet available!"));
 				}
 				case SpringProcessConnectorService.HEAP_MEMORY: {
 					SpringProcessMemoryMetricsLiveData data = connectorService.getMemoryMetricsLiveData(processKey);
-					return CompletableFuture.completedFuture(data.getHeapMemoryMetrics());
+					return data != null ? CompletableFuture.completedFuture(data.getHeapMemoryMetrics()): CompletableFuture.failedFuture(new IllegalStateException("Live Metrics Data is not yet available!"));
 				}
 				case SpringProcessConnectorService.NON_HEAP_MEMORY: {
                     SpringProcessMemoryMetricsLiveData data = connectorService.getMemoryMetricsLiveData(processKey);
-                    return CompletableFuture.completedFuture(data.getNonHeapMemoryMetrics());
+                    return data != null ? CompletableFuture.completedFuture(data.getNonHeapMemoryMetrics()) : CompletableFuture.failedFuture(new IllegalStateException("Live Metrics Data is not yet available!"));
                 }
 				default: {}
 			}