Unused Private Field

ID

java.unused_private_field

Severity

low

Remediation Complexity

trivial

Remediation Risk

low

Remediation Effort

low

Resource

Code Smell

Language

Java

Tags

CWE:563, code-style, unused-code

Description

Reports private fields that are never referenced anywhere in the class body.

Rationale

A private field that is never read or written (beyond its declaration) is dead code. It consumes memory at runtime, clutters the class, and may mislead readers into thinking it plays a role. It often results from incomplete refactoring or abandoned functionality.

// Bad -- field is never used
public class Account {
    private int obsoleteCounter = 0;
    private String name;

    public String getName() { return name; }
}

// Good -- only keep fields that are referenced
public class Account {
    private String name;

    public String getName() { return name; }
}

Remediation

Remove the unused field. If it was intended for future use, add it when actually needed.

References