Mabin-J commented on a change in pull request #4288:
URL: https://github.com/apache/zeppelin/pull/4288#discussion_r816537601



##########
File path: 
zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/NoteManager.java
##########
@@ -78,8 +78,8 @@ private void init() throws IOException {
         {
           try {
             addOrUpdateNoteNode(new Note(new NoteInfo(entry.getKey(), 
entry.getValue())));
-          } catch (IOException e) {
-            LOGGER.warn(e.getMessage());
+          } catch (Throwable e) {
+            LOGGER.warn("addOrUpdateNoteNode Fail: {}", entry.getKey() + " - " 
+ e.getMessage(), e);

Review comment:
       Unfortunately, I cannot get stacktrace, anymore because I moved company. 
   
   I think that maybe filenames or folder names  were weird.
   
   When I saw that exception, I tried to upgrade 0.7 to 0.9. So I ran script 
for upgrade notebooks. Many staff of company used zeppelin (not only data 
team), many notebook's name could be bad. (even use `*`, `(`, `)`,`[`, `]`, 
etc). Many bad notebook name maybe affect filename or foldername when upgrade 
notebook.




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