A few changes from google's default

checkstyle.xml

@@ -19,7 +19,7 @@
 <module name = "Checker">
     <property name="charset" value="UTF-8"/>
 
-    <property name="severity" value="warning"/>
+    <property name="severity" value="error"/>
 
     <property name="fileExtensions" value="java, properties, xml"/>
     <!-- Excludes all 'module-info.java' files              -->
@@ -42,7 +42,7 @@
 
     <module name="LineLength">
         <property name="fileExtensions" value="java"/>
-        <property name="max" value="100"/>
+        <property name="max" value="120"/>
         <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
     </module>
 
@@ -60,7 +60,6 @@
             <property name="allowByTailComment" value="true"/>
             <property name="allowNonPrintableEscapes" value="true"/>
         </module>
-        <module name="AvoidStarImport"/>
         <module name="OneTopLevelClass"/>
         <module name="NoLineWrap">
             <property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT"/>
@@ -216,15 +215,16 @@
              value="GenericWhitespace ''{0}'' is not preceded with whitespace."/>
         </module>
         <module name="Indentation">
-            <property name="basicOffset" value="2"/>
+            <property name="basicOffset" value="4"/>
             <property name="braceAdjustment" value="0"/>
-            <property name="caseIndent" value="2"/>
+            <property name="caseIndent" value="4"/>
             <property name="throwsIndent" value="4"/>
             <property name="lineWrappingIndentation" value="4"/>
-            <property name="arrayInitIndent" value="2"/>
+            <property name="arrayInitIndent" value="4"/>
         </module>
         <module name="AbbreviationAsWordInName">
             <property name="ignoreFinal" value="false"/>
+            <property name="allowedAbbreviations" value="API" />
             <property name="allowedAbbreviationLength" value="1"/>
             <property name="tokens"
              value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, ANNOTATION_DEF, ANNOTATION_FIELD_DEF,
@@ -232,12 +232,6 @@
         </module>
         <module name="OverloadMethodsDeclarationOrder"/>
         <module name="VariableDeclarationUsageDistance"/>
-        <module name="CustomImportOrder">
-            <property name="sortImportsInGroupAlphabetically" value="true"/>
-            <property name="separateLineBetweenGroups" value="true"/>
-            <property name="customImportOrderRules" value="STATIC###THIRD_PARTY_PACKAGE"/>
-            <property name="tokens" value="IMPORT, STATIC_IMPORT, PACKAGE_DEF"/>
-        </module>
         <module name="MethodParamPad">
             <property name="tokens"
              value="CTOR_DEF, LITERAL_NEW, METHOD_CALL, METHOD_DEF,
@@ -265,6 +259,7 @@
             <property name="id" value="AnnotationLocationMostCases"/>
             <property name="tokens"
              value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF"/>
+            <property name="allowSamelineMultipleAnnotations" value="true"/>
         </module>
         <module name="AnnotationLocation">
             <property name="id" value="AnnotationLocationVariables"/>

pom.xml

@@ -331,6 +331,13 @@
           <failsOnError>true</failsOnError>
           <linkXRef>false</linkXRef>
         </configuration>
+        <dependencies>
+          <dependency>
+            <groupId>com.puppycrawl.tools</groupId>
+            <artifactId>checkstyle</artifactId>
+            <version>8.30</version>
+          </dependency>
+        </dependencies>
         <executions>
           <execution>
             <id>validate</id>