I was trying to figured out how to solve this issue. Basically I’m saving a user profile bean that contains multiple occurrences of other beans inside him. Something like date:<\/p>\n
public class UserProfile {\r\n\r\n\tList classes1;\r\n\tList classes2;\r\n\t\r\n\tInteger int1;\r\n\tMap classes3;\r\n\r\n}<\/pre>\nI was working fine until I changed a getter adding some business functionalities and surrounding all lines with a try \/ catch. Of course, I putted the exception message on the log using adding this definition inside the bean:<\/p>\n
protected final Log logger = LogFactory.getLog(getClass());<\/pre>\nGood point for me, everything worked fine until I updated the object in Mongo. Holy crap, I got the “Cannot use a complex object as a key value” exception and I spent two hours trying to change the beans (of course I did a lot of other changes after the fatal adding of business logic inside my bean). Exhausted, I contacted my colleague Max (@maxfarnea<\/a>) and he told me, “when I got this error, I removed the log inside a bean”. Ipso facto, I removed the log entry from my bean, added a throws exception instead of a try \/ catch and tested! Well done @maxfarnea<\/a>, it works! <\/p>\nI learned two lesson today: one, don’t put log into beans that need to be stored using spring-data and, two, if you are in pain, ask, talk, don’t be silly, don’t waste your time!!! Stackoverflow.com<\/a> is a good point to start (and my blog either, of course) but never is more helpful than a quick chat with a colleague! <\/p>\nShare this:<\/h3>