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With the next major Crate versions > 0.57.X won't support the transport protocol anymore. Therefore, the Crate client which relies on the transport protocol will be removed in favour of PostgreSQL wire protocol. Please use the PostgreSQL JDBC or Crate JDBC driver >= 2.X driver instead of the Crate client. For more detailed information on the support of the PostgreSQL wire protocol by Crate, see Crate Postgres wire protocol documentation https://crate.io/docs/reference/en/latest/protocols/postgres.html

Java Client for Crate Crate is the distributed database for containerized environments such as Docker. Based on the familiar SQL syntax Crate combines high availability, resiliency, and scalability in a distributed design that allows to query mountains of data in real-time, not batches.
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