| Name | Description | Type | Package | Framework |
| ByteBufferInputStream | Utility to present ByteBuffer data as an InputStream. | Class | org.apache.avro.util | Avro |
| ByteBufferOutputStream | Utility to collect data written to an OutputStream in ByteBuffers. | Class | org.apache.avro.util | Avro |
| ClassUtils | Class | org.apache.avro.util | Avro | |
| Utf8 | A Utf8 string. | Class | org.apache.avro.util | Avro |
| WeakIdentityHashMap | Useful for caches that need to key off of a == comparison instead of a . | Class | org.apache.avro.util | Avro |