HighFile-scopeJava Plug & play

Avoid ClassCastException Due to Unsafe Casting

Ensure that instanceof checks are used before performing explicit type casting to prevent ClassCastException.

Why this matters

Unsafe casting can lead to runtime ClassCastException errors. Always use instanceof checks before performing type casting.

Side-by-side examples engineers can pattern-match during review.

Avoid

private String hexString(Object o) {
  return Integer.toHexString((Integer) o); // Noncompliant if hexString is called with a String for example
}

Prefer

private String hexString(Integer i) {
  return Integer.toHexString(i);
}

From the same buckets as this rule.

Critical
Avoid equality operators in loop termination conditions
Check if loops use equality operators (== or !=) in termination conditions. These can lead to infinite loops if the condition is never met exactly. Instead, use relational operators like < or > for safer loop termination.
error-handlingreadability-refactor
Critical
Avoid Returning Null in Non-Async Task Methods
Returning null from a Task or Task<T> method causes a NullReferenceException if awaited. Use Task.CompletedTask or Task.FromResult<T>(null) instead.
error-handlingreadability-refactor+1
Critical
Avoid Using Boolean Expressions in `except` Statements
Detect `except` clauses that use `or` or `and` to catch multiple exceptions. This does not work as intended. Recommend using a tuple of exceptions instead.
error-handlingstack-python