diff --git a/clickhouse-jdbc/src/main/java/ru/yandex/clickhouse/ClickHouseConnectionImpl.java b/clickhouse-jdbc/src/main/java/ru/yandex/clickhouse/ClickHouseConnectionImpl.java
index 6ec960ca4..1ba8d191e 100644
--- a/clickhouse-jdbc/src/main/java/ru/yandex/clickhouse/ClickHouseConnectionImpl.java
+++ b/clickhouse-jdbc/src/main/java/ru/yandex/clickhouse/ClickHouseConnectionImpl.java
@@ -209,22 +209,25 @@ public String nativeSQL(String sql) throws SQLException {
 
     @Override
     public void setAutoCommit(boolean autoCommit) throws SQLException {
-
+        if (autoCommit) {
+            return;
+        }
+        throw new SQLFeatureNotSupportedException("Transactions are not supported");
     }
 
     @Override
     public boolean getAutoCommit() throws SQLException {
-        return false;
+        return true;
     }
 
     @Override
     public void commit() throws SQLException {
-
+        throw new SQLException("Cannot commit when auto-commit is enabled");
     }
 
     @Override
     public void rollback() throws SQLException {
-
+        throw new SQLException("Cannot rollback when auto-commit is enabled");
     }
 
     @Override