checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
    "https://checkstyle.org/dtds/configuration_1_3.dtd">

<!--
    Enterprise Checkstyle configuration for knowledgeops-agent.
    Based on Google Java Style with project-specific adjustments.
-->
<module name="Checker">
    <property name="charset" value="UTF-8"/>
    <property name="severity" value="warning"/>
    <property name="fileExtensions" value="java"/>

    <!-- File length -->
    <module name="FileLength">
        <property name="max" value="500"/>
        <property name="severity" value="warning"/>
    </module>

    <!-- No tab characters -->
    <module name="FileTabCharacter">
        <property name="eachLine" value="true"/>
    </module>

    <!-- Trailing whitespace -->
    <module name="RegexpSingleline">
        <property name="format" value="\s+$"/>
        <property name="message" value="Line has trailing whitespace."/>
    </module>

    <module name="TreeWalker">
        <!-- Naming conventions -->
        <module name="ConstantName"/>
        <module name="LocalVariableName"/>
        <module name="MemberName"/>
        <module name="MethodName"/>
        <module name="PackageName"/>
        <module name="ParameterName"/>
        <module name="TypeName"/>

        <!-- Imports -->
        <module name="AvoidStarImport"/>
        <module name="UnusedImports"/>
        <module name="RedundantImport"/>

        <!-- Coding -->
        <module name="EmptyStatement"/>
        <module name="EqualsHashCode"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="OneStatementPerLine"/>

        <!-- Blocks -->
        <module name="NeedBraces">
            <property name="allowSingleLineStatement" value="true"/>
        </module>

        <!-- Whitespace -->
        <module name="WhitespaceAround">
            <property name="allowEmptyConstructors" value="true"/>
            <property name="allowEmptyMethods" value="true"/>
            <property name="allowEmptyTypes" value="true"/>
            <property name="allowEmptyLambdas" value="true"/>
        </module>

        <!-- SQL injection prevention: flag string concat in SQL queries -->
        <module name="RegexpSinglelineJava">
            <property name="format" value="&quot;.*SELECT.*\+.*"/>
            <property name="message" value="Possible SQL injection: string concatenation in SQL query."/>
            <property name="severity" value="error"/>
        </module>
    </module>
</module>