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Preview/pmd#49
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coderabbitaibot commentedJul 16, 2025 • edited
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WalkthroughA new Java class, Changes
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Actionable comments posted: 6
🧹 Nitpick comments (1)
ruleset.xml (1)
30-33:Consider explicitly defining naming patterns.While PMD defaults are generally good, consider adding explicit patterns for fields, methods, and classes if your team has specific conventions to ensure consistency.
Example configuration with explicit patterns:
<ruleref="category/java/codestyle.xml/FieldNamingConventions"> <properties> <propertyname="publicConstantPattern"value="^[A-Z][A-Z0-9_]*$"/> <propertyname="constantPattern"value="^[A-Z][A-Z0-9_]*$"/> <propertyname="finalFieldPattern"value="^[a-z][a-zA-Z0-9]*$"/> <propertyname="defaultFieldPattern"value="^[a-z][a-zA-Z0-9]*$"/> </properties></rule>
📜 Review details
Configuration used: .coderabbit.yaml
Review profile: CHILL
Plan: Pro
⛔ Files ignored due to path filters (1)
.coderabbit.yamlis excluded by none and included by none
📒 Files selected for processing (2)
bad.java(1 hunks)ruleset.xml(1 hunks)
🧰 Additional context used
🪛 PMD (7.15.0)
bad.java
[Medium] 3-3: Avoid unused private fields such as 'unusedField'. (UnusedPrivateField)
(Best Practices)
[Medium] 5-5: Avoid unnecessary constructors - the compiler will generate these for you (UnnecessaryConstructor)
(Code Style)
[High] 9-9: The instance method name 'DOStuff' doesn't match '[a-z][a-zA-Z0-9]*' (MethodNamingConventions)
(Code Style)
[High] 11-11: The local variable name 'FooBar' doesn't match '^[a-z][a-zA-Z0-9]*$' (LocalVariableNamingConventions)
(Code Style)
[Medium] 17-19: Avoid empty catch blocks (EmptyCatchBlock)
(Error Prone)
[Medium] 20-20: Avoid returning from a finally block (ReturnFromFinallyBlock)
(Error Prone)
🔇 Additional comments (5)
ruleset.xml (4)
1-8:Well-structured PMD ruleset configuration!The XML header and namespace declarations are correctly formatted for PMD 2.0.0.
9-13:Good selection of essential code quality rules.These rules effectively catch common coding issues like unused fields, improper exception handling, and unnecessary code.
15-20:Standard Java naming convention for local variables.The regex pattern correctly enforces camelCase starting with lowercase. Consider documenting why this specific pattern was chosen if it differs from your team's conventions.
22-28:Reasonable complexity thresholds.The NCSS (Non-Commenting Source Statements) limits of 25 for methods and 500 for classes strike a good balance between maintainability and practicality.
bad.java (1)
1-24:Note: This appears to be an intentional example of bad code.Given the filename and PR context, this file seems designed to demonstrate PMD rule violations. If this is indeed a test file, consider:
- Moving it to a test resources directory
- Adding a clear comment at the top indicating it's an intentional bad example
- Ensuring it's excluded from production code
| // unnecessary constructor | ||
| } | ||
| public void DOStuff() { |
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Follow Java naming conventions for methods.
Method names should start with a lowercase letter.
- public void DOStuff() {+ public void doStuff() {
🧰 Tools
🪛 PMD (7.15.0)
[High] 9-9: The instance method name 'DOStuff' doesn't match '[a-z][a-zA-Z0-9]*' (MethodNamingConventions)
(Code Style)
🤖 Prompt for AI Agents
In bad.java at line 9, the method name DOStuff does not follow Java namingconventions which require method names to start with a lowercase letter. Renamethe method from DOStuff to doStuff to comply with the standard Java namingconventions.| public BadExample() { | ||
| // unnecessary constructor | ||
| } |
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Remove unnecessary constructor.
The default constructor adds no value and can be removed.
- public BadExample() {- // unnecessary constructor- }
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| publicBadExample() { | |
| // unnecessary constructor | |
| } |
🧰 Tools
🪛 PMD (7.15.0)
[Medium] 5-5: Avoid unnecessary constructors - the compiler will generate these for you (UnnecessaryConstructor)
(Code Style)
🤖 Prompt for AI Agents
In bad.java around lines 5 to 7, the constructor is unnecessary as it does notadd any functionality. Remove the entire constructor method to rely on thedefault constructor provided by Java.| public void DOStuff() { | ||
| try { | ||
| int FooBar = 1; |
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Follow Java naming conventions for local variables.
Local variable names should start with a lowercase letter.
- int FooBar = 1;+ int fooBar = 1;
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| intFooBar =1; | |
| intfooBar =1; |
🧰 Tools
🪛 PMD (7.15.0)
[High] 11-11: The local variable name 'FooBar' doesn't match '^[a-z][a-zA-Z0-9]*$' (LocalVariableNamingConventions)
(Code Style)
🤖 Prompt for AI Agents
In bad.java at line 11, the local variable name 'FooBar' starts with anuppercase letter, which violates Java naming conventions. Rename the variable tostart with a lowercase letter, such as 'fooBar', to follow standard Java stylefor local variables.| } catch (Exception e) { | ||
| // silently ignored | ||
| } finally { |
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Avoid empty catch blocks.
Empty catch blocks silently swallow exceptions, making debugging difficult. At minimum, log the exception.
} catch (Exception e) {- // silently ignored+ // Log the exception or handle it appropriately+ e.printStackTrace(); // Or use proper logging } finally {📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| }catch (Exceptione) { | |
| // silently ignored | |
| }finally { | |
| }catch (Exceptione) { | |
| // Log the exception or handle it appropriately | |
| e.printStackTrace();// Or use proper logging | |
| }finally { |
🧰 Tools
🪛 PMD (7.15.0)
[Medium] 17-19: Avoid empty catch blocks (EmptyCatchBlock)
(Error Prone)
🤖 Prompt for AI Agents
In bad.java around lines 17 to 19, the catch block is empty and silently ignoresexceptions, which hinders debugging. Modify the catch block to log the caughtexception using an appropriate logging mechanism or print the stack trace toensure the error is recorded and can be diagnosed later.| } catch (Exception e) { | ||
| // silently ignored | ||
| } finally { | ||
| return; // forbidden in finally block |
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Never return from a finally block.
Returning from a finally block suppresses any exceptions thrown in the try or catch blocks and can lead to unexpected behavior.
} finally {- return; // forbidden in finally block+ // Cleanup code if needed, but no return statement }📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| return;// forbidden infinallyblock | |
| }finally{ | |
| // Cleanup code if needed, but no return statement | |
| } |
🧰 Tools
🪛 PMD (7.15.0)
[Medium] 20-20: Avoid returning from a finally block (ReturnFromFinallyBlock)
(Error Prone)
🤖 Prompt for AI Agents
In bad.java at line 20, remove the return statement from the finally blockbecause returning there suppresses exceptions from try or catch blocks. Instead,restructure the code to avoid returning inside finally, such as moving thereturn to the try or catch blocks or using a variable to hold the return valueand returning after the finally block completes.| @@ -0,0 +1,24 @@ | |||
| public class BadExample { | |||
| private int unusedField; | |||
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Remove unused private field.
The fieldunusedField is declared but never used in the class.
- private int unusedField;📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| private int unusedField; |
🧰 Tools
🪛 PMD (7.15.0)
[Medium] 3-3: Avoid unused private fields such as 'unusedField'. (UnusedPrivateField)
(Best Practices)
🤖 Prompt for AI Agents
In bad.java at line 3, there is a private field named unusedField that isdeclared but never used anywhere in the class. Remove this unused private fielddeclaration to clean up the code and avoid unnecessary clutter.
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Summary by CodeRabbit