Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3567#discussion_r107946611
--- Diff: tools/maven/strict-checkstyle.xml ---
@@ -0,0 +1,550 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+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 module PUBLIC
+ "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
+ "http://www.puppycrawl.com/dtds/configuration_1_3.dtd";>
+
+<!--
+This is a checkstyle configuration file. For descriptions of
+what the following rules do, please see the checkstyle configuration
+page at http://checkstyle.sourceforge.net/config.html.
+
+This file is based on the checkstyle file of Apache Beam.
+-->
+
+<module name="Checker">
+
+ <!--<module name="FileTabCharacter">-->
+ <!--<!– Checks that there are no tab characters in the file.
–>-->
+ <!--</module>-->
+
+ <module name="NewlineAtEndOfFile">
+ <!-- windows can use \n\r vs \n, so enforce the most used one ie UNIx
style -->
+ <property name="lineSeparator" value="lf" />
+ </module>
+
+ <module name="RegexpSingleline">
+ <!-- Checks that TODOs don't have stuff in parenthesis, e.g.,
username. -->
+ <property name="format" value="((//.*)|(\*.*))TODO\(" />
+ <property name="message" value="TODO comments must not include
usernames." />
+ <property name="severity" value="error" />
+ </module>
+
+ <module name="RegexpSingleline">
+ <property name="format" value="\s+$"/>
+ <property name="message" value="Trailing whitespace"/>
+ <property name="severity" value="error"/>
+ </module>
+
+ <module name="RegexpSingleline">
+ <property name="format" value="Throwables.propagate\("/>
+ <property name="message" value="Throwables.propagate is deprecated"/>
+ <property name="severity" value="error"/>
+ </module>
+
+ <!-- Prevent *Tests.java as tools may not pick them up -->
+ <!--<module name="RegexpOnFilename">-->
+ <!--<property name="fileNamePattern" value=".*Tests\.java$" />-->
+ <!--</module>-->
+
+ <!-- Allow use of comment to suppress javadocstyle -->
+ <module name="SuppressionCommentFilter">
+ <property name="offCommentFormat" value="CHECKSTYLE.OFF\: ([\w\|]+)"/>
+ <property name="onCommentFormat" value="CHECKSTYLE.ON\: ([\w\|]+)"/>
+ <property name="checkFormat" value="$1"/>
+ </module>
+ <module name="SuppressionFilter">
+ <property name="file" value="${checkstyle.suppressions.file}"
default="suppressions.xml" />
+ </module>
+
+ <!-- Check that every module has a package-info.java -->
+ <!--<module name="JavadocPackage"/>-->
+
+ <!--
+
+ FLINK CUSTOM CHECKS
+
+ -->
+
+ <module name="FileLength">
+ <property name="max" value="2500"/>
+ </module>
+
+ <!-- All Java AST specific tests live under TreeWalker module. -->
+ <module name="TreeWalker">
+
+ <!--
+
+ FLINK CUSTOM CHECKS
+
+ -->
+
+ <module name="RegexpSinglelineJava">
+ <property name="format" value="^\t* +\t*\S" />
+ <property name="message"
+ value="Line has leading space characters; indentation
should be performed with tabs only." />
+ <property name="ignoreComments" value="true" />
+ </module>
+
+ <!-- Prohibit T.getT() methods for standard boxed types -->
+ <module name="Regexp">
+ <property name="format" value="Boolean\.getBoolean"/>
+ <property name="illegalPattern" value="true"/>
+ <property name="message" value="Use System.getProperties() to get
system properties."/>
--- End diff --
This is the Javadoc for the method that the checks are referring to:
```
/**
* Returns {@code true} if and only if the system property
* named by the argument exists and is equal to the string
* {@code "true"}. (Beginning with version 1.0.2 of the
* Java<small><sup>TM</sup></small> platform, the test of
* this string is case insensitive.) A system property is accessible
* through {@code getProperty}, a method defined by the
* {@code System} class.
* <p>
* If there is no property with the specified name, or if the specified
* name is empty or null, then {@code false} is returned.
*
* @param name the system property name.
* @return the {@code boolean} value of the system property.
* @throws SecurityException for the same reasons as
* {@link System#getProperty(String) System.getProperty}
* @see java.lang.System#getProperty(java.lang.String)
* @see java.lang.System#getProperty(java.lang.String, java.lang.String)
*/
public static boolean getBoolean(String name) {
```
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