Java developers may become frustrated when they encounter a key schema mismatch issue in DynamoDB's DeleteItem API. Usually, this error occurs when the primary key that was supplied does not match the structure of the table. We examine methods to guarantee that the key aligns perfectly using the Java SDK v2, with an emphasis on configuring the DeleteItemRequest with precise partition and sort keys. Using DynamoDbException for error handling is also essential for efficiently managing and diagnosing these problems, which will increase the robustness and dependability of your program.