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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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PT_RELATIVE_PATH_TRAVERSAL

PT: Relative path traversal in servlet (PT_RELATIVE_PATH_TRAVERSAL)
The software uses an HTTP request parameter to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.

See http://cwe.mitre.org/data/definitions/23.html
for more information.
FindBugs looks only for the most blatant, obvious cases of relative path traversal.
If FindBugs found any, you almost certainly have more
vulnerabilities that FindBugs doesn't report. If you are concerned about relative path traversal, you should seriously
consider using a commercial static analysis or pen-testing tool.