Java CodeQL queries for Code Quality

Explore the queries that CodeQL uses to analyze code quality for code written in Java.

Code Quality uses the following CodeQL queries to analyze Java code and detect code quality issues on:

Yourdefault branch, with results shown on the repository's "Standard findings" dashboard
Pull requests, with findings shown as comments made bygithub-code-quality[bot]

Copilot Autofix suggestions are provided for findings where possible.

Query name	Category	Severity
Access to unsupported JDK-internal API	Maintainability	Recommendation
Boxed variable is never null	Maintainability	Warning
Cast from abstract to concrete collection	Maintainability	Warning
Class has same name as super class	Maintainability	Recommendation
Confusing method names because of capitalization	Maintainability	Recommendation
Confusing overloading of methods	Maintainability	Recommendation
Constant interface anti-pattern	Maintainability	Recommendation
Container contents are never accessed	Maintainability	Error
Inefficient empty string test	Maintainability	Recommendation
Inefficient String constructor	Maintainability	Recommendation
Inner class could be static	Maintainability	Recommendation
Interface cannot be implemented	Maintainability	Warning
Javadoc has impossible 'throws' tag	Maintainability	Recommendation
Misleading indentation	Maintainability	Warning
Missing Override annotation	Maintainability	Recommendation
Missing space in string literal	Maintainability	Recommendation
Mocking all public methods of a class may indicate the unit test is testing too much	Maintainability	Recommendation
Non-case label in switch statement	Maintainability	Recommendation
Non-explicit control and whitespace characters	Maintainability	Warning
Possible confusion of local and field	Maintainability	Recommendation
Spurious Javadoc @param tags	Maintainability	Recommendation
Subtle call to inherited method	Maintainability	Warning
Underscore used as identifier	Maintainability	Recommendation
Unread local variable	Maintainability	Recommendation
Unused classes and interfaces	Maintainability	Recommendation
Unused format argument	Maintainability	Warning
Unused label	Maintainability	Recommendation
Use of VisibleForTesting in production code	Maintainability	Warning
Useless null check	Maintainability	Warning
Useless parameter	Maintainability	Recommendation
Useless toString on String	Maintainability	Recommendation
Useless type test	Maintainability	Warning
Array index out of bounds	Reliability	Error
Character passed to StringBuffer or StringBuilder constructor	Reliability	Error
Comparison of identical values	Reliability	Error
Constant loop condition	Reliability	Warning
Container contents are never initialized	Reliability	Error
Container size compared to zero	Reliability	Warning
Continue statement that does not continue	Reliability	Warning
Contradictory type checks	Reliability	Error
Dereferenced expression may be null	Reliability	Warning
Dereferenced variable is always null	Reliability	Error
Dereferenced variable may be null	Reliability	Warning
Direct call to a run() method	Reliability	Recommendation
Do not call`finalize()`	Reliability	Error
Double-checked locking is not thread-safe	Reliability	Error
Equals method does not inspect argument type	Reliability	Error
Equals on incomparable types	Reliability	Error
Equals or hashCode on arrays	Reliability	Error
Escaping	Reliability	Warning
Exposing internal representation	Reliability	Recommendation
Expression always evaluates to the same value	Reliability	Warning
Hashed value without hashCode definition	Reliability	Error
Ignored error status of call	Reliability	Recommendation
Ignored serialization member of record class	Reliability	Warning
Implicit conversion from array to string	Reliability	Recommendation
Inconsistent equals and hashCode	Reliability	Error
Inconsistent synchronization of getter and setter	Reliability	Error
Inefficient output stream	Reliability	Warning
Inefficient primitive constructor	Reliability	Recommendation
Inefficient use of key set iterator	Reliability	Recommendation
Iterable wrapping an iterator	Reliability	Warning
Iterator implementing Iterable	Reliability	Warning
Left shift by more than the type width	Reliability	Warning
Missing`@Nested` annotation on JUnit 5 inner test class	Reliability	Warning
Missing catch of NumberFormatException	Reliability	Recommendation
Missing format argument	Reliability	Error
Non-final method invocation in constructor	Reliability	Error
Non-synchronized override of synchronized method	Reliability	Warning
Not thread-safe	Reliability	Warning
Potential database resource leak	Reliability	Warning
Potential input resource leak	Reliability	Warning
Potential output resource leak	Reliability	Warning
Race condition in double-checked locking object initialization	Reliability	Warning
Reference equality test of boxed types	Reliability	Error
Result of multiplication cast to wider type	Reliability	Warning
Safe publication	Reliability	Warning
Self assignment	Reliability	Error
Suspicious date format	Reliability	Warning
Synchronization on boxed types or strings	Reliability	Error
Type mismatch on container access	Reliability	Error
Type mismatch on container modification	Reliability	Error
Unreachable catch clause	Reliability	Warning
Use of`String#replaceAll` with a first argument which is not a regular expression	Reliability	Recommendation
Use of default toString()	Reliability	Recommendation
Useless comparison test	Reliability	Warning
Whitespace contradicts operator precedence	Reliability	Warning
Wrong NaN comparison	Reliability	Error
Zero threads set for`java.util.concurrent.ScheduledThreadPoolExecutor`	Reliability	Recommendation

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Java CodeQL queries for Code Quality