Describe the PR

This PR introduces a new PMD ruleRepeatedPrimitiveValueRule for Apex that detects repeated primitive values (strings and numbers) within a class that could be extracted into named constants to improve code maintainability and reduce magic numbers/strings.

The rule identifies primitive literals that appear multiple times in the same class and flags them as potential candidates for constant extraction. It provides intelligent handling for common scenarios:

• Excludes acceptable repeated values: Common values like0,1,-1, and empty strings
• Ignores boolean literals:true andfalse values are acceptable to repeat
• Special Date/DateTime handling: Numbers used inDate.newInstance() andDateTime.newInstance() calls are not flagged
• Constant detection: Already definedstatic final constants are not flagged again
• Null safety: Null values are ignored

Example violations:

publicclassExample {publicvoidmethod1() {Integertimeout=30;// violation: 30 appears multiple timesStringmessage='Hello World';// violation if repeated    }publicvoidmethod2() {Integerdelay=30;// violation: same value repeatedStringgreeting='Hello World';// violation: same string repeated    }}

The rule helps developers identify opportunities to extract magic numbers and strings into well-named constants, improving code readability and maintainability.

Related issues

• Fix[apex] New Rule: Repeated Primitive Value #5323

Ready?

• Added unit tests for fixed bug/feature
• Passing all unit tests
• Complete build./mvnw clean verify passes (checked automatically by github actions)
• Added (in-code) documentation (if needed)