Error Prone changelog

Changelog History

Page 1

• v2.50.0 Changes

  June 10, 2026

  🆕 New checks:

  • BoxingComparator: Detect implicitly-boxing Comparator.comparing key extractors
  • ExposedPrivateType: Discourage references to private member classes from non-private APIs
  • ✅ JUnitMethodInvoked: Discourage directly invoking JUnit test methods
  • 🚚 ListRemoveAmbiguous: Detect ambiguous calls to List.remove(int|Integer)
  • ✅ PreferTestParameter: suggests using @TestParameter instead of @TestParameters for exhaustive boolean and enum parameters on single-element parameterized tests
  • RecordComponentAccessorAnnotationConflict: Detect conflicts between record components and explicit accessor methods
  • RecordComponentOverride: Discourage @OverRide on record component declarations that don't override
    anything
  • ThrowableEqualsHashCode: Discourage overriding Throwable.equals() and hashCode()

  Closed issues: #5553, #5649, #5778

  Full changelog: v2.49.0...v2.50.0

• v2.49.0 Changes

  April 07, 2026

  🚀 This release includes several changes to Matcher APIs, and removed some deprecated or problematic APIs:

  • ✂ Remove deprecated MethodMatchers.withSignature API, which relies on fragile toString behaviour. Alternatives for matching on method signatures with varargs and type parameters were added in a98a1c5.
  • ✂ Removed variableType(Matcher) API. Matchers.variableType(Matcher) uses VariableTree#getType to match variable types, which own't work for lambda parameters with inferred types after JDK-8268850. The recommended replacement is variableType(TypePredicate).
  • 📦 Make enclosingPackage return an optional. Module elements are not enclosed by a package, checks using enclosingPackage shouldn't assume an enclosing package exists when processing arbitrary elements.
  • 🆕 New FieldMatchers API, similar to MethodMatchers (1dd9c3a).

  🆕 New checks:

  • AssertThrowsBlockToExpression: Discourage unnecessary block lambdas in assertThrows.
  • AssertThrowsMinimizer: Suggest minimizing the amount of logic in assertThrows.
  • MemorySegmentReferenceEquality: Discourage using reference equality for MemorySegments.
  • 👻 PreferThrowsTag: Recommends using @throws instead of the legacy @exception javadoc tag.
  • RecordAccessorInCompactConstructor: detect record accessors inside the compact canonical ctors, which read uninitialized fields.

  Closed issues: #2283, #3503, #5210, #5289, #5548, #5548, #5554, #5609, #5614, #5656

  Full changelog: v2.48.0...v2.49.0

• v2.48.0 Changes

  February 27, 2026

  🔄 Changes:

  • ➕ Added support for passing flags with command-line argument files (@-files) (8e84edf)

  🆕 New checks:

  • AvoidValueSetter
  • UnnecessarySemicolon

  Closed issues: #5529, #5537, #5522, #5521

  Full changelog: v2.47.0...v2.48.0

• v2.47.0 Changes

  February 05, 2026

  🆕 New checks:

  • InterruptedInCatchBlock: Detect accidental calls to Thread.interrupted() inside of catch(InterruptedException e) blocks.
  • 🔨 RefactorSwitch: Refactorings to simplify arrow switches
  • UnnamedVariable: Rename unused variables to _

  Closed issues: #1811, #4168, #5459, #5460

  Full changelog: v2.46.0...v2.47.0

• v2.46.0 Changes

  January 08, 2026

  🔄 Changes:

  • 👀 The javac flag -XDaddTypeAnnotationsToSymbol=true is now required for Error Prone invocations on JDK 21, to enable the javac fix for JDK-8225377: type annotations are not visible to javac plugins across compilation boundaries. See #5426 for details.
  • ✂ Remove deprecated value attribute from @IncompatibleModifiers and @RequiredModifiers (#2122)
  • Error Prone API changes to encapsulate references to internal javac APIs for end position handling (EndPosTable, DiagnosticPosition) (5440bb4, 06c2905, f3915ec)

  🆕 New checks:

  • DuplicateAssertion: detect duplicated assertion lines where the argument to assertThat is pure
  • IfChainToSwitch: suggest converting chains of if-statements into arrow switches
  • ScannerUseDelimiter: discourage Scanner.useDelimiter("\\A")
  • 🔨 AddNullMarkedToClass: refactoring to add @NullMarked annotation to top level classes

• v2.45.0 Changes

  November 27, 2025

  🔄 Changes:

  • 👌 Improved compatibility with latest JDK 26 EA builds.

  🆕 New checks:

  • AssertSameIncompatible: Detect calls to assertSame and similar assertions, where the calls are guaranteed to either succeed or fail.
  • FormatStringShouldUsePlaceholders: Suggests using a format string instead of string concatenation operations on format methods

  Closed issues: #5335

  Full changelog: v2.44.0...v2.45.0

• v2.44.0 Changes

  November 07, 2025

  🔄 Changes

  • 0️⃣ The default severity for LabelledBreakTarget is now an error
  • ⚡️ Update dependency on Guava (#5108)

  Closed issues: #5218, #5278

  Full changelog: v2.43.0...v2.44.0

• v2.43.0 Changes

  October 22, 2025

  👍 The minimum supported JDK version to run Error Prone is now JDK 21 (#4867).

  🔄 Changes:

  • -XepPatchChecks now skips disabled checks (#4943)
  • 👕 AndroidJdkLibsChecker has been removed, the recommended replacement for Android code is Android Lint's NewApi check

  🆕 New checks:

  • NullNeedsCastForVarargs: Detect calls that incorrectly passes a null array instead of a null element.
  • RedundantNullCheck: detect checks on expressions that are non-null.

  Closed issues: #4943, #5102, #5107, #5121, #5158, #5217, #5239

  Full changelog: v2.42.0...v2.43.0

• v2.42.0 Changes

  September 17, 2025

  🆕 New checks:

  • ExplicitArrayForVarargs: discourage unnecessary explicit construction of an array to provide varargs.
  • FloggerPerWithoutRateLimit: discourage Flogger's perUnique without rate limiting
  • StringJoin: Ban String.join(CharSequence) and String.join(CharSequence, CharSequence)
  • 🏗 ThreadBuilderNameWithPlaceholder: Do not allow placeholders in Thread.Builder.name(String) or name(String, int).

  🔄 Changes:

  • The return type of ASTHelpers.asFlagSet has changed. The previous type was EnumSet<Flags.Flag>, where Flags.Flag is an enum in the javac class Flags. A recent JDK change has replaced that enum with a new top-level enum called FlagsEnum. It is not possible to change ASTHelpers.asFlagSet in a way that would be type-safe and compatible with the enums from JDKs both before and after the change. Instead, the method now returns ImmutableSet<String>, where the strings come from the toString() of the enum constants. That means they are "native", "abstract", etc.
  • 🖨 Flag IO.print[ln]() in SystemOut.

  Full changelog: v2.41.0...v2.42.0

• v2.41.0 Changes

  July 24, 2025

  🆕 New checks:

  • EffectivelyPrivate: Detect declarations that have public or protected modifiers, but are effectively private

  🔄 Changes:

  • Skip BooleanLiteral findings if the target type is boxed (#5134)

  Full changelog: v2.40.0...v2.41.0

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