eclipse/settings/code-style/gwt-checkstyle-suppressions.xml

<?xml version="1.0"?>
<!DOCTYPE suppressions PUBLIC
    "-//Puppy Crawl//DTD Suppressions 1.0//EN"
    "http://www.puppycrawl.com/dtds/suppressions_1_0.dtd">
<suppressions>
    <!-- Suppress errors on files with Java 9 syntax.
         Can be removed when checkstyle is upgraded
     -->
    <suppress checks="TreeWalker"
        files="user/test-super/com/google/gwt/dev/jjs/super/com/google/gwt/dev/jjs/test/Java8Test.java"/>
    <!-- Suppress errors on files that use type annotations.
         Can be removed when checkstyle is upgraded
      -->
    <suppress checks="ModifierOrder"
        files="user/super/com/google/gwt/emul/java/lang/Enum.java"/>
    <suppress checks="ModifierOrder"
        files="user/super/com/google/gwt/emul/java/lang/String.java"/>
    <suppress checks="ModifierOrder"
        files="user/super/com/google/gwt/emul/java/lang/Throwable.java"/>
</suppressions>