Java SDK provides ample ways to help with general coding requirements. Yet, while development, some methods for easier manipulation of core classes are missing. mindsmine-jems (Java Extended MethodS) makes an attempt at providing utility classes such as String manipulation, Object wrappers, amongst others.
Releases
4.8.0 
4.0.0
3.5.6
3.5.5
3.5.0
3.1.0
2.1.0
2.0.0
1.0
Code
The work is available under the Apache 2.0 license and can be accessed on the mindsmine-jems repository hosted on GitHub.