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How to comment out / use a composite section key in Cassandra in java?

I know I can use the partition key by annotating @PartitionKey when the partition key is simple (single column). How can I do the same if the partition key is composite.

I couldn't find anything for this in the datastax documentation and google didn't help either.

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Here's an example with one column:

@PartitionKey
private UUID userId;


And with a composite key:

@PartitionKey(0)
private int pk1;

@PartitionKey(1)
private int pk2;
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