JUnit tests pass in Eclipse but fail in Maven Surefire

Question

I have written some JUnit tests using JUnit 4 and spring-test libraries. When I run the tests inside Eclipse then run fine and pass. But when I run them using Maven (during

Answer 1

I had this problem today testing a method that converted an object that contained a Map to a JSON string. I assume Eclipse and the Maven surefire plugin were using different JREs which had different implementations of HashMap ordering or something, which caused the tests run through Eclipse to pass and the tests run through surefire to fail (assertEquals failed). The easiest solution was to use an implementation of Map that had reliable ordering.