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Sanity4J was created to simplify running multiple static code analysis tools on the Java projects. It provides a single entry point to run all the selected tools and produce a consolidated report, which presents all findings in an easily accessible manner.

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DMI_COLLECTION_OF_URLS

Dm: Maps and sets of URLs can be performance hogs (DMI_COLLECTION_OF_URLS)
 This method or field is or uses a Map or Set of URLs. Since both the equals and hashCode
method of URL perform domain name resolution, this can result in a big performance hit.
See http://michaelscharf.blogspot.com/2006/11/javaneturlequals-and-hashcode-make.html for more information.
Consider using java.net.URI instead.