Pattern: Illegal instantiation where a factory method is preferred
Issue: -
Checks for illegal instantiations where a factory method is preferred.
Rationale: Depending on the project, for some classes it might be preferable to create instances through factory methods rather than calling the constructor.
A simple example is the java.lang.Boolean class. For performance reasons, it is preferable to use the predefined constants TRUE and FALSE. Constructor invocations should be replaced by calls to Boolean.valueOf().
Some extremely performance sensitive projects may require the use of factory methods for other classes as well, to enforce the usage of number caches or object pools.
To configure the check to find instantiations of java.lang.Boolean:
<module name="IllegalInstantiation">
<property name="classes" value="java.lang.Boolean"/>
</module>