The Astra DB Java SDK has two vector annotations that are easy to confuse, and picking the wrong one means embeddings are never generated or are stored twice. @Vectorize hands embedding generation to Astra (Vectorize); @Vector stores embeddings you computed yourself. The astra-db-java object-mapping guide's best practices say: "Choose between @Vectorize and @Vector: Use @Vectorize for automatic vectorization, @Vector for pre-computed embeddings." A field may also carry only one special annotation (@DocumentId, @Vectorize, @Lexical, or @Vector), so stacking them fails. When using vector features, always set vectorDimension on the collection (for example 1536 for text-embedding-ada-002) and configure the vectorize provider and model to match.