PgBouncer throwing PSQLException: ERROR: unsupported pkt type: 80 when issuing query "SHOW POOLS" on "pgbouncer" database via JDBC

PgBouncer throwing PSQLException: ERROR: unsupported pkt type: 80 when issuing query "SHOW POOLS" on "pgbouncer" database via JDBC

当尝试通过 JDBC 在 pgbouncer 数据库上发出“SHOW POOLS”或任何统计查询命令时，遇到以下异常。

org.postgresql.util.PSQLException: ERROR: unsupported pkt type: 80
    at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2270)
    at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1998)
    at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:570)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:406)
    at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:286)

JDBC代码：

String connectionUrl = "jdbc:postgresql://"+ipaddress+":"+port+"/"+database; 
con = DriverManager.getConnection(connectionUrl, userName, password);
statement = con.createStatement(); statement.executeQuery("SHOW POOLS");



JDBC Driver Version: 42.2.14 ;
PgBouncer Version: 1.14.0 ;
Postgres Version: 11.4;

PS: 能够手动连接到 pgbouncer 数据库并发出所有 pgbouncer 管理命令，如 SHOW POOLS 或 SHOW STATS。只是无法从 JDBC.

执行相同的操作

JDBC默认使用扩展查询协议，此类查询尝试使用简单协议

String connectionUrl = "jdbc:postgresql://"+ipaddress+":"+port+"/"+database+"?preferQueryMode=simple";