replace sysout with proper logging of exceptions

Author: martinlippert

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/beans/QualifierReferencesProvider.java

@@ -21,6 +21,8 @@
 import org.eclipse.jdt.core.dom.MemberValuePair;
 import org.eclipse.lsp4j.Location;
 import org.eclipse.lsp4j.jsonrpc.CancelChecker;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.ide.vscode.boot.index.SpringMetamodelIndex;
 import org.springframework.ide.vscode.boot.java.Annotations;
 import org.springframework.ide.vscode.boot.java.handlers.ReferenceProvider;
@@ -34,6 +36,8 @@
  */
 public class QualifierReferencesProvider implements ReferenceProvider {
 
+	private static final Logger log = LoggerFactory.getLogger(QualifierReferencesProvider.class);
+
 	private final SpringMetamodelIndex springIndex;
 
 	public QualifierReferencesProvider(SpringMetamodelIndex springIndex) {
@@ -61,7 +65,7 @@ else if (node instanceof Expression expression && node.getParent() instanceof Me
 			}
 		}
 		catch (Exception e) {
-			e.printStackTrace();
+			log.error("error finding references for qualifier value", e);
 		}
 
 		return null;

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/java/value/ValuePropertyReferencesProvider.java

@@ -95,7 +95,7 @@ public List<? extends Location> provideReferences(CancelChecker cancelToken, IJa
 			}
 		}
 		catch (Exception e) {
-			e.printStackTrace();
+			log.error("error finding references for value properties", e);
 		}
 
 		return null;