CODEWITHSUNDEEP
springspring-boottomcat
user3133300
user3133300

Reputation: 627

How to read tomcat error log

Here is a screenshot of my tomcat spring boot error log. How do I read this?enter image description here

Specifically,

1.) where do I read there is says "63 more"?

2.) Is the top-most error the most generic, or most specific? I'm thinking most generic because it says "caused by" and then another error.

Thanks.

Upvotes: 0

Views: 1461

Answers (2)

user911651
user911651

Reputation:

The first line contains the exact reason for the error, such as this: 

java.lang.NullPointerException
abc.def.ghi.handleRequest(MyController.java:30)
...

The more you go down, the more information you get about the root cause. Usually you can find the cause at the bottom of the log message containing the stack trace. In your case, the cause for the exception is "No converter found capable of converting from type ...".

Upvotes: 0

khoibv
khoibv

Reputation: 369

  1. First, get destination of log (console, file, database, ...) by find information in:

    • application.properties (for example: spring.log.**** = ...)
    • or log4j.properties/log4j.yml/log4j.yaml (if using log4j)
    • or log4j2.properties/log4j2.yml/log4j2.yaml (if using log4j2)
    • or logback.properties/logback.yml (if using logback)
      and then you can get "63 more" there

  2. It's the most specific
    most specific error <== root cause is here
    ^ cause by: generic error
    ^ cause by: generic error
    ...
    ^ cause by: most generic error

Upvotes: 1

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