Added more error checking to GraphQL login

pom.xml

@@ -10,7 +10,7 @@
     </parent>
     <groupId>de.samply</groupId>
     <artifactId>directory_sync_service</artifactId>
-    <version>1.5.11</version>
+    <version>1.5.12</version>
     <name>directory_sync_service</name>
     <description>Directory sync</description>
     <url>https://github.com/samply/directory_sync_service</url>

src/main/java/de/samply/directory_sync_service/directory/graphql/DirectoryApiGraphql.java

@@ -96,13 +96,26 @@ public boolean login() {
 
       String endpoint = directoryEndpointsGraphql.getLoginEndpoint();
       JsonObject result = directoryCallsGraphql.runGraphqlCommand(endpoint, graphqlCommand);
-
       if (result == null) {
         logger.warn("login: result is null");
         return false;
       }
 
-      String token = result.get("signin").getAsJsonObject().get("token").getAsString();
+      JsonElement signin = result.get("signin");
+      if (signin == null) {
+        logger.warn("login: signin is null");
+        logger.warn("login: result: " + Util.jsonStringFomObject(result));
+        return false;
+      }
+
+      JsonElement tokenObject = signin.getAsJsonObject().get("token");
+      if (tokenObject == null) {
+        logger.warn("login: tokenObject is null");
+        logger.warn("login: signin: " + Util.jsonStringFomObject(signin));
+        return false;
+      }
+
+      String token = tokenObject.getAsString();
       if (token == null) {
         logger.warn("login: token is null");
         return false;

src/main/java/de/samply/directory_sync_service/fhir/FhirApi.java

@@ -382,7 +382,7 @@ public Patient extractPatientFromSpecimen(Specimen specimen) {
                         .replaceFirst("Patient/", ""))
                 .execute();
     } catch (Exception e) {
-      logger.warn("extractPatientFromSpecimen: caught exception", Util.traceFromException(e));
+      logger.warn("extractPatientFromSpecimen: caught exception: " + Util.traceFromException(e));
     }
 
     return patient;