System.out.println(DateTime.now()) which DateTime was imported as
In Eclipse the code is compiled successfully, but when I tried to execute it it poped up a strange error: NoSuchMethodError: org.joda.time.DateTime.now()
What? DateTime.now() is a well-known API and I check the source code, it's available since Joda jar 2.0, in my maven dependency it clearly shows that my joda jar library is 2.0. Then I even manually added a latest version which is version 2.6 and clearly see that the 2.6 version is picked up.
But, the problem still exists. What's wrong with Joda?
Then I see that in my project, I also have storm-core api, which also has a joda-time dependency, so I exclude it. Now I see that
in Eclipse the DateTime also has library, and it points to jruby-complete-1.6.8.jar, then it tells me whether the problem is.
Root cause:
1. my HBase program imported external jars, one of them is jruby-complete-1.6.8.jar, which internally has a joda-time reference, but it's a very low version.
2. somehow this version got picked up and makes DateTime.now() has a problem as it's only available after 2.0
Solution
1. remove the external library jruby-complete-1.6.8.jar in Java Build Path (as the screenshot above, choose the jruby-complete-1.6.8.jar and click Remove)
2. Use maven to add jruby-complete-1.6.8 dependency
3. Add Joda-time dependency and make sure it comes first as the screenshot below shows
DateTime.now() is a wonderful world!
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