src/main/user-impl/java/com/mysql/cj/jdbc/CallableStatementWrapper.java [1765:1789]:
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                return iface.cast(this);
            }

            if (this.unwrappedInterfaces == null) {
                this.unwrappedInterfaces = new HashMap<>();
            }

            Object cachedUnwrapped = this.unwrappedInterfaces.get(iface);

            if (cachedUnwrapped == null) {
                cachedUnwrapped = Proxy.newProxyInstance(this.wrappedStmt.getClass().getClassLoader(), new Class<?>[] { iface },
                        new ConnectionErrorFiringInvocationHandler(this.wrappedStmt));
                this.unwrappedInterfaces.put(iface, cachedUnwrapped);
            }

            return iface.cast(cachedUnwrapped);
        } catch (ClassCastException cce) {
            throw SQLError.createSQLException(Messages.getString("Common.UnableToUnwrap", new Object[] { iface.toString() }),
                    MysqlErrorNumbers.SQLSTATE_CONNJ_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
        } finally {
            this.lock.unlock();
        }
    }

    @Override
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src/main/user-impl/java/com/mysql/cj/jdbc/PreparedStatementWrapper.java [881:905]:
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                return iface.cast(this);
            }

            if (this.unwrappedInterfaces == null) {
                this.unwrappedInterfaces = new HashMap<>();
            }

            Object cachedUnwrapped = this.unwrappedInterfaces.get(iface);

            if (cachedUnwrapped == null) {
                cachedUnwrapped = Proxy.newProxyInstance(this.wrappedStmt.getClass().getClassLoader(), new Class<?>[] { iface },
                        new ConnectionErrorFiringInvocationHandler(this.wrappedStmt));
                this.unwrappedInterfaces.put(iface, cachedUnwrapped);
            }

            return iface.cast(cachedUnwrapped);
        } catch (ClassCastException cce) {
            throw SQLError.createSQLException(Messages.getString("Common.UnableToUnwrap", new Object[] { iface.toString() }),
                    MysqlErrorNumbers.SQLSTATE_CONNJ_ILLEGAL_ARGUMENT, this.exceptionInterceptor);
        } finally {
            this.lock.unlock();
        }
    }

    @Override
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