checkstyle_suppressions.xml

<?xml version="1.0"?>
<!--
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  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
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  (the "License"); you may not use this file except in compliance with
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<!DOCTYPE suppressions PUBLIC
        "-//Checkstyle//DTD SuppressionFilter Configuration 1.1//EN"
        "https://checkstyle.org/dtds/suppressions_1_1.dtd">

<suppressions>
  <suppress checks="RegexpSinglelineJava" files="Semaphore\.java"/>
</suppressions>