SonarSource Rules
  • Products

    In-IDE

    Code Quality and Security in your IDE with SonarQube Ide

    IDE extension that lets you fix coding issues before they exist!

    Discover SonarQube for IDE

    SaaS

    Code Quality and Security in the cloud with SonarQube Cloud

    Setup is effortless and analysis is automatic for most languages

    Discover SonarQube Cloud

    Self-Hosted

    Code Quality and Security Self-Hosted with SonarQube Server

    Fast, accurate analysis; enterprise scalability

    Discover SonarQube Server
  • SecretsSecrets
  • ABAPABAP
  • AnsibleAnsible
  • ApexApex
  • AzureResourceManagerAzureResourceManager
  • CC
  • C#C#
  • C++C++
  • CloudFormationCloudFormation
  • COBOLCOBOL
  • CSSCSS
  • DartDart
  • DockerDocker
  • FlexFlex
  • GitHub ActionsGitHub Actions
  • GoGo
  • HTMLHTML
  • JavaJava
  • JavaScriptJavaScript
  • JSONJSON
  • JCLJCL
  • KotlinKotlin
  • KubernetesKubernetes
  • Objective CObjective C
  • PHPPHP
  • PL/IPL/I
  • PL/SQLPL/SQL
  • PythonPython
  • RPGRPG
  • RubyRuby
  • RustRust
  • ScalaScala
  • ShellShell
  • SwiftSwift
  • TerraformTerraform
  • TextText
  • TypeScriptTypeScript
  • T-SQLT-SQL
  • VB.NETVB.NET
  • VB6VB6
  • XMLXML
  • YAMLYAML
Java

Java static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your JAVA code

  • All rules 733
  • Vulnerability60
  • Bug175
  • Security Hotspot40
  • Code Smell458

  • Quick Fix 65
Filtered: 9 rules found
java16
    Impact
      Clean code attribute
        1. 'serialVersionUID' field should not be set to '0L' in records

           Code Smell
        2. Equals method should be overridden in records containing array fields

           Bug
        3. Reflection should not be used to increase accessibility of records' fields

           Bug
        4. Custom getter method should not be used to override record's getter behavior

           Code Smell
        5. Members ignored during record serialization should not be used

           Bug
        6. Redundant constructors/methods should be avoided in records

           Code Smell
        7. Records should be used instead of ordinary classes when representing immutable data structure

           Code Smell
        8. "Stream.toList()" method should be used instead of "collectors" when unmodifiable list needed

           Code Smell
        9. Pattern Matching for "instanceof" operator should be used instead of simple "instanceof" + cast

           Code Smell

        Pattern Matching for "instanceof" operator should be used instead of simple "instanceof" + cast

        intentionality - clear
        maintainability
        Code Smell
        • java16

        Why is this an issue?

        More Info

        In Java 16, the feature "Pattern matching for instanceof" is finalized and can be used in production. Previously developers needed to do 3 operations in order to do this: check the variable type, cast it and assign the casted value to the new variable. This approach is quite verbose and can be replaced with pattern matching for instanceof, doing these 3 actions (check, cast and assign) in one expression.

        This rule raises an issue when an instanceof check followed by a cast and an assignment could be replaced by pattern matching.

        Noncompliant code example

        int f(Object o) {
          if (o instanceof String) {  // Noncompliant
            String string = (String) o;
            return string.length();
          }
          return 0;
        }
        

        Compliant solution

        int f(Object o) {
          if (o instanceof String string) {  // Compliant
            return string.length();
          }
          return 0;
        }
        
          Available In:
        • SonarQube IdeCatch issues on the fly,
          in your IDE
        • SonarQube CloudDetect issues in your GitHub, Azure DevOps Services, Bitbucket Cloud, GitLab repositories
        • SonarQube Community BuildAnalyze code in your
          on-premise CI
          Available Since
          9.1
        • SonarQube ServerAnalyze code in your
          on-premise CI
          Developer Edition
          Available Since
          9.1

        © 2008-2025 SonarSource SA. All rights reserved.

        Privacy Policy | Cookie Policy | Terms of Use