The checkstyle utility (http://checkstyle.sourceforge.net/) is a common tool for linting coding standards. It comes with configurations to support two coding standards (Sun's and Google's), however customized coding standards can be configured through XML file. The CLI supports a basic XML report over stdout which fits nicely with arcanist's lint engine structure.
The PMD utility (https://pmd.github.io/) is another tool for linting general java errors, as well as having the ability to detect copy/pasted code. The CLI also supports basic XML report over stdout which can feed into arcanist's lint engine.