Java 无法从Vertx3中的Postgres存储过程返回值

我似乎无法从postgres db获得返回值…知道如何修复此问题吗

JsonArray outParam = new JsonArray().add("integer");

connection.callWithParams(spAddUser, params, outParam, response -> {

    if (response.succeeded()) {
        ResultSet result = response.result();
    ...

我的错误是：

org.postgresql.util.PSQLException: No function outputs were registered.
at org.postgresql.jdbc.PgStatement.checkIndex(PgStatement.java:2208)
at org.postgresql.jdbc.PgStatement.checkIndex(PgStatement.java:2191)
at org.postgresql.jdbc.PgStatement.getObject(PgStatement.java:2088)
at com.mchange.v2.c3p0.impl.NewProxyCallableStatement.getObject(NewProxyCallableStatement.java:172)
at io.vertx.ext.jdbc.impl.actions.JDBCCallable.convertOutputs(JDBCCallable.java:83)
at io.vertx.ext.jdbc.impl.actions.JDBCCallable.execute(JDBCCallable.java:59)
at io.vertx.ext.jdbc.impl.actions.JDBCCallable.execute(JDBCCallable.java:33)
at io.vertx.ext.jdbc.impl.actions.AbstractJDBCAction.handle(AbstractJDBCAction.java:48)

以下是我的样本存储过程：

create or replace function addUser(_acid int, _slno int, _dob date)
returns int as $$

    insert into users (acid,slno,dob)
    values (_acid, _slno, _dob)
    returning uid;
$$ language sql;

---

我发现如果我在存储过程中没有使用in/out，就不必传入输出参数。因此，将输出参数设置为

null

可以解决问题

connection.callWithParams(spAddUser, params, null, response -> {

if (response.succeeded()) {
    ResultSet result = response.result();
...