SEI CERT Oracle Coding Standard for Java

Space shortcuts

Page tree

Versions Compared

Old Version 28

changes.mady.by.user Dean Sutherland

Saved on

compared with

New Version Current

changes.mady.by.user Will Snavely

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

The definitions of two constant expressions should be related when and only related exactly when the values they express are also related.

Noncompliant Code Example

In this noncompliant code example, OUT_STR_LEN must always be exactly two greater than IN_STR_LEN. This is not obvious from the definitions. These definitions fail to reflect this requirement:

Code Block
bgColor#FFcccc

public static final int IN_STR_LEN = 18;
public static final int OUT_STR_LEN = 20;

Compliant Solution

The In this compliant solution, the relationship between the two values should be is represented in the definitions.:

Code Block
bgColor#ccccff

public static final int IN_STR_LEN = 18;
public static final int OUT_STR_LEN = IN_STR_LEN + 2;

Noncompliant Code Example

In this noncompliant code example, there appears to be an underlying relationship between the two constants , when in fact there is none.where none exists:

Code Block
bgColor#FFcccc

public static final int ADULTVOTING_AGE = 18;
public static final int ALCOHOL_AGE = ADULTVOTING_AGE + 3;

A programmer performing routine maintenance may modify the definition for ADULTVOTING_AGE but fail to recognize the resulting change in the definition for ALCOHOL_AGE.

Compliant Solution

The definitions should In this compliant solution, the definitions reflect the lack independence of a relationship between the two constants.:

Code Block
bgColor#ccccff

public static final int ADULTVOTING_AGE = 18;
public static final int ALCOHOL_AGE = 21;

Risk Assessment

Failure to properly encode relationships in constant declarations may lead to unexpected values and may complicate maintenance.

Guideline

Severity

Likelihood

Remediation Cost

Priority

Level

DCL03-J

low

unlikely

high

P1

L3

Other Languages

...

This guideline appears in the C++ Secure Coding Standard as DCL08-CPP. Properly encode relationships in constant definitions.
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this guideline on the CERT website.
Bibliography
...
[JLS 
...
2013]§4.12.4, "final Variables"
 
...
Image Added Image Added Image AddedDCL02-J. Use meaningful symbolic constants to represent literal values in program logic      03. Declarations and Initialization (DCL)      DCL04-J. Declare mathematical constants as static and final