Groovy java.sql.SQLException: No suitable driver found for jdbc:sqlserver:// - windows

Question

I am quite new to groovy and am quite confused about the Groovy java.sql.SQLException that I'm getting.
Here is my code
// https://mvnrepository.com/artifact/com.microsoft.sqlserver/mssql-jdbc
#Grapes(
#Grab(group='com.microsoft.sqlserver', module='mssql-jdbc', version='7.2.2.jre8')
)
import groovy.sql.*
def username = xxx, password = yyy
// Create connection to MSSQL with classic JDBC DriverManager.
def db = Sql.newInstance("jdbc:sqlserver://localhost:1433;database=tempdb;", username, password, 'com.microsoft.sqlserver.jdbc.SQLServerDriver')
The same SQL JDBC Connection string ("jdbc:sqlserver://localhost:1433;database=tempdb;", 'com.microsoft.sqlserver.jdbc.SQLServerDriver') works just fine for my other cases, like Java or JMeter, but not works with groovy. This is what I'm getting:
> groovy groovy-sql-test.groovy
Picked up _JAVA_OPTIONS: -Xms512M -Xmx1g
Caught: java.sql.SQLException: No suitable driver found for jdbc:sqlserver://localhost:1433;database=tempdb;
java.sql.SQLException: No suitable driver found for jdbc:sqlserver://localhost:1433;database=tempdb;
at groovy-sql-0.run(groovy-sql-0.groovy:11)
This is running under Win10.
I've also tried
groovy -cp D:\path\to\my\jars groovy-sql-test.groovy
where within the D:\path\to\my\jars dir, I'm having both sqljdbc41.jar and mssql-jdbc-7.2.2.jre8.jar files.

Answer 1

You have to use #GrabConfig(systemClassLoader=true) to use the system
classloader and thus get the jdbc driver picked up.
From https://groovy-lang.org/databases.html#_connecting_using_grab
The #GrabConfig statement is necessary to make sure the system
classloader is used. This ensures that the driver classes and system
classes like java.sql.DriverManager are in the same classloader.