| Name | Description | Type | Package | Framework |
| BoundedBlockingQueue | BoundedBlockingQueue wraps any Queue and turns the result into a BlockingQueue with a limited capacity. | Class | akka.util | Akka |
| BoxedType | Class | akka.util | Akka | |
| BoxedType$ | Class | akka.util | Akka | |
| ByteIterator | An iterator over a ByteString. | Class | akka.util | Akka |
| ByteIterator$ | Class | akka.util | Akka | |
| ByteIterator .ByteArrayIterator | Class | akka.util.ByteIterator | Akka | |
| ByteIterator .ByteArrayIterator$ | Class | akka.util.ByteIterator | Akka | |
| ByteIterator .MultiByteArrayIterator | Class | akka.util.ByteIterator | Akka | |
| ByteIterator .MultiByteArrayIterator$ | Class | akka.util.ByteIterator | Akka | |
| ByteString | A rope-like immutable data structure containing bytes. | Class | akka.util | Akka |
| ByteString$ | Class | akka.util | Akka | |
| ByteString .ByteString1 | An unfragmented ByteString. | Class | akka.util.ByteString | Akka |
| ByteString .ByteString1$ | Class | akka.util.ByteString | Akka | |
| ByteString .ByteString1C | A compact (unsliced) and unfragmented ByteString, implementation of ByteString1C. | Class | akka.util.ByteString | Akka |
| ByteString .ByteString1C$ | Class | akka.util.ByteString | Akka | |
| ByteString .ByteStrings | A ByteString with 2 or more fragments. | Class | akka.util.ByteString | Akka |
| ByteString .ByteStrings$ | Class | akka.util.ByteString | Akka | |
| ByteString .Companion | Interface | akka.util.ByteString | Akka | |
| ByteString .Companion$ | Class | akka.util.ByteString | Akka | |
| ByteStringBuilder | A mutable builder for efficiently creating a ByteString. | Class | akka.util | Akka |
| ClassLoaderObjectInputStream | ClassLoaderObjectInputStream tries to utilize the provided ClassLoader to load Classes and falls back to ObjectInputStreams resolver. | Class | akka.util | Akka |
| Collections | Class | akka.util | Akka | |
| Collections$ | Class | akka.util | Akka | |
| Collections .EmptyImmutableSeq$ | Class | akka.util.Collections | Akka | |
| Collections .PartialImmutableValuesIterable | Class | akka.util.Collections | Akka | |
| CompactByteString | A compact ByteString. | Class | akka.util | Akka |
| CompactByteString$ | Class | akka.util | Akka | |
| ConcurrentMultiMap | An implementation of a ConcurrentMultiMap Adds/remove is serialized over the specified key | Class | akka.util | Akka |
| Crypt | Class | akka.util | Akka | |
| Crypt$ | Class | akka.util | Akka | |
| HashCode | Set of methods which allow easy implementation of hashCode. | Class | akka.util | Akka |
| HashCode$ | Set of methods which allow easy implementation of hashCode. | Class | akka.util | Akka |
| Helpers | Class | akka.util | Akka | |
| Helpers$ | Class | akka.util | Akka | |
| Helpers .ConfigOps | Class | akka.util.Helpers | Akka | |
| Helpers .ConfigOps$ | Class | akka.util.Helpers | Akka | |
| Helpers .Requiring | Implicit class providing requiring methods. | Class | akka.util.Helpers | Akka |
| Helpers .Requiring$ | Class | akka.util.Helpers | Akka | |
| Index | An implementation of a ConcurrentMultiMap Adds/remove is serialized over the specified key | Class | akka.util | Akka |
| JavaDurationConverters | Class | akka.util | Akka | |
| JavaDurationConverters$ | Class | akka.util | Akka | |
| JavaDurationConverters .JavaDurationOps | Class | akka.util.JavaDurationConverters | Akka | |
| JavaDurationConverters .JavaDurationOps$ | Class | akka.util.JavaDurationConverters | Akka | |
| JavaDurationConverters .ScalaDurationOps | Class | akka.util.JavaDurationConverters | Akka | |
| JavaDurationConverters .ScalaDurationOps$ | Class | akka.util.JavaDurationConverters | Akka | |
| LineNumbers | This is a minimized byte-code parser that concentrates exclusively on line numbers and source file extraction. | Class | akka.util | Akka |
| LineNumbers$ | This is a minimized byte-code parser that concentrates exclusively on line numbers and source file extraction. | Class | akka.util | Akka |
| LineNumbers .NoSourceInfo$ | Class | akka.util.LineNumbers | Akka | |
| LineNumbers .SourceFile | Class | akka.util.LineNumbers | Akka | |
| LineNumbers .SourceFile$ | Class | akka.util.LineNumbers | Akka | |
| LineNumbers .SourceFileLines | Class | akka.util.LineNumbers | Akka | |
| LineNumbers .SourceFileLines$ | Class | akka.util.LineNumbers | Akka | |
| LineNumbers .UnknownSourceFormat | Class | akka.util.LineNumbers | Akka | |
| LineNumbers .UnknownSourceFormat$ | Class | akka.util.LineNumbers | Akka | |
| PrettyDuration | Class | akka.util | Akka | |
| PrettyDuration$ | Class | akka.util | Akka | |
| PrettyDuration .PrettyPrintableDuration | Class | akka.util.PrettyDuration | Akka | |
| PrettyDuration .PrettyPrintableDuration$ | Class | akka.util.PrettyDuration | Akka | |
| PriorityQueueStabilizer | PriorityQueueStabilizer wraps a priority queue so that it respects FIFO for elements of equal priority. | Interface | akka.util | Akka |
| PriorityQueueStabilizer$ | Class | akka.util | Akka | |
| PriorityQueueStabilizer .WrappedElement | Class | akka.util.PriorityQueueStabilizer | Akka | |
| PriorityQueueStabilizer .WrappedElementComparator | Class | akka.util.PriorityQueueStabilizer | Akka | |
| ReentrantGuard | Class | akka.util | Akka | |
| Reflect | Collection of internal reflection utilities which may or may not be available (most services specific to HotSpot, but fails gracefully). | Class | akka.util | Akka |
| Reflect$ | Collection of internal reflection utilities which may or may not be available (most services specific to HotSpot, but fails gracefully). | Class | akka.util | Akka |
| SerializedSuspendableExecutionContext | This ExecutionContext allows to wrap an underlying ExecutionContext and provide guaranteed serial execution of tasks submitted to it. | Class | akka.util | Akka |
| SerializedSuspendableExecutionContext$ | Class | akka.util | Akka | |
| StablePriorityBlockingQueue | StablePriorityBlockingQueue is a blocking priority queue that preserves order for elements of equal priority. | Class | akka.util | Akka |
| StablePriorityQueue | StablePriorityQueue is a priority queue that preserves order for elements of equal priority. | Class | akka.util | Akka |
| Subclassification | Typeclass which describes a classification hierarchy. | Interface | akka.util | Akka |
| SubclassifiedIndex | Mutable index which respects sub-class relationships between keys: - adding a key inherits from super-class | Class | akka.util | Akka |
| SubclassifiedIndex$ | Class | akka.util | Akka | |
| SubclassifiedIndex .Nonroot | Class | akka.util.SubclassifiedIndex | Akka | |
| Switch | Class | akka.util | Akka | |
| Switch$ | Class | akka.util | Akka | |
| Timeout | Class | akka.util | Akka | |
| Timeout$ | A Timeout is a wrapper on top of Duration to be more specific about what the duration means. | Class | akka.util | Akka |
| TypedMultiMap | An immutable multi-map that expresses the value type as a type function of the key type. | Class | akka.util | Akka |
| TypedMultiMap$ | Class | akka.util | Akka | |
| Unsafe | Class | akka.util | Akka | |
| WildcardTree | Class | akka.util | Akka | |
| WildcardTree$ | Class | akka.util | Akka | |