feat(mysql-dual-conn): add endpoint to trigger COM_STMT_RESET

mysql-dual-conn/src/main/java/com/example/mysqlreplicate/QueryController.java

@@ -3,8 +3,12 @@
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -56,4 +60,33 @@ public List<Map<String, Object>> queryOms() {
     public List<Map<String, Object>> queryCamunda() {
         return camundaJdbc.queryForList("SELECT 1 AS camunda_check");
     }
+
+    /**
+     * Re-executes a server-prepared statement {@code n} times on the SAME
+     * JDBC connection. With useServerPrepStmts=true + useCursorFetch=true,
+     * Connector/J 8.x opportunistically emits COM_STMT_RESET before each
+     * COM_STMT_EXECUTE after the first, to clear cursor / long-data state.
+     *
+     * During Keploy replay this exercises the synthetic-OK fallback added
+     * in keploy/keploy#4217 — without it, the unmocked COM_STMT_RESET would
+     * cascade into "Connection closing due to no matching mock found" and
+     * tear down the TCP connection.
+     */
+    @GetMapping("/api/oms/stmt-reset/{n}")
+    public List<Integer> stmtReset(@PathVariable("n") int n) {
+        return omsJdbc.execute((java.sql.Connection conn) -> {
+            List<Integer> values = new ArrayList<>(n);
+            try (PreparedStatement ps = conn.prepareStatement("SELECT ? AS v")) {
+                for (int i = 0; i < n; i++) {
+                    ps.setInt(1, i);
+                    try (ResultSet rs = ps.executeQuery()) {
+                        if (rs.next()) {
+                            values.add(rs.getInt(1));
+                        }
+                    }
+                }
+            }
+            return values;
+        });
+    }
 }

mysql-dual-conn/src/main/resources/application.properties

@@ -1,7 +1,12 @@
 server.port=8080
 
 # --- OMS DataSource (primary) ---
-datasource.oms.jdbc-url=jdbc:mysql://localhost:3306/myntra_oms?useSSL=false&allowPublicKeyRetrieval=true
+# useServerPrepStmts + cachePrepStmts + useCursorFetch force Connector/J 8.x
+# to issue COM_STMT_PREPARE / COM_STMT_EXECUTE (and COM_STMT_RESET between
+# re-executions on the same connection) instead of plain COM_QUERY.
+# This lets /api/oms/stmt-reset/{n} exercise the COM_STMT_RESET synthetic-OK
+# fallback added in keploy/keploy#4217.
+datasource.oms.jdbc-url=jdbc:mysql://localhost:3306/myntra_oms?useSSL=false&allowPublicKeyRetrieval=true&useServerPrepStmts=true&cachePrepStmts=true&useCursorFetch=true
 datasource.oms.username=omsAppUser
 datasource.oms.password=omsPassword
 datasource.oms.driver-class-name=com.mysql.cj.jdbc.Driver