improving error output

src/main/java/at/ac/uibk/gitsearch/service/gitlab_events/GitlabEventService.java

@@ -1086,7 +1086,16 @@ public class GitlabEventService {
             return null;
         }
         if (tree.get().hasErrors()) {
-            logger.info("project {} has errors and is not indexed", project.getId());
+            String errors = tree
+                .get()
+                .getErrors()
+                .entrySet()
+                .stream()
+                .map(e -> {
+                    return String.format("%s: %s", e.getKey(), e.getValue().stream().collect(Collectors.joining(", ")));
+                })
+                .collect(Collectors.joining("\\n"));
+            logger.info("project {} has errors and is not indexed: {}", project.getId(), errors);
         } else {
             if (logger.isDebugEnabled()) {
                 logger.debug("parsed tree:");