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The bug involves a NullPointerException being thrown when calling the getGeneratedKeys() method on a Statement object after executing an executeBatch() operation in a JDBC application using the MariaDB connector.
This behavior is inconsistent with the MySQL JDBC connector, where no such exception is thrown under similar circumstances, suggesting a potential bug in the MariaDB JDBC connector.
In addition, if I change the first batch SQL to "INSERT INTO table5_0 VALUES(16, -601)", which does not violate the constraint, getGeneratedKeys() will not throw NullPointerException, too.
@Test
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public void test() throws SQLException {
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Connection con = null;
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Statement stmt = null;
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ResultSet rs = null;
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con = DriverManager.getConnection("jdbc:mariadb://localhost:3366/test5?user=user&password=password");
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stmt = con.createStatement();
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stmt.executeUpdate("CREATE TABLE table5_0(id SMALLINT PRIMARY KEY,value BIGINT);");
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stmt = con.createStatement();
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stmt.addBatch("INSERT INTO table5_0 VALUES(1679640894, -601)");
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stmt.addBatch("UPDATE table5_0 SET value = 226 WHERE id <= 0");
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try {
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stmt.executeBatch();
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} catch (Exception e) {
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System.out.println(e);
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}
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try {
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rs = stmt.getGeneratedKeys(); // java.lang.NullPointerException: Cannot invoke "java.util.List.iterator()" because "this.results" is null
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} catch (Exception e) {
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System.out.println(e);
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}
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}
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