Updates the API This PR has the goal to update the code using the newest API until Java 8. These improvements are:
- Use switch instead of multiple if/else: The switch is faster because there are special bytecodes that allow efficient switch statement evaluation when there are a lot of cases. - Simplifies code using Objects.equals: It reduces the number of lines of code using the Objects.equals <https://docs.oracle.com/javase/8/docs/api/java/util/Objects.html#equals-java.lang.Object-java.lang.Object->also it will be faster considering the JIT factor. - Simplifies the primitive compare using Integer.compare <https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html#compare-int-int-> - Reduces code using removeif condition in the collection. - from the JVM specification it repleaces L instead of l <https://docs.oracle.com/javase/specs/jls/se8/html/jls-3.html#jls-3.10>. ref: https://github.com/apache/tomee/pull/370
