Apply Checkstyle, Errorprone etc. for all Java modules (FINERACT-1171)

config/checkstyle/checkstyle.xml

@@ -32,6 +32,9 @@
         Checks included in MissingSwitchDefault are handled by ErrorProne
     -->
 
+    <module name="SuppressionFilter">
+        <property name="file" value="${config_loc}/suppressions.xml"/>
+    </module>
     <module name="FileTabCharacter">
         <property name="eachLine" value="true"/>
     </module>

config/checkstyle/suppressions.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0"?>
+<!--
+    Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements. See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership. The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License. You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied. See the License for the
+    specific language governing permissions and limitations
+    under the License.
+-->
+<!DOCTYPE suppressions PUBLIC
+    "-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
+    "https://checkstyle.org/dtds/suppressions_1_2.dtd">
+
+<!--
+    This file contains suppression rules for Checkstyle checks.
+    Ideally only files that cannot be modified (e.g. third-party code)
+    should be added here. All other violations should be fixed.
+-->
+
+<suppressions>
+    <suppress files="[/\\]build[/\\]generated[/\\]" checks=".*"/>
+</suppressions>