Rest Endpoint Error

[Shah Baloch]

Hi,
I'm trying to create a Rest Endpoint from ScriptRunner, however, I'm getting errors. I copied the code from the ScriptRunner's page. Actually, I'm trying to make a text field to a dropdown. The field full the customer name from the database. Currently, its text field user has to write the correct name in order to create a ticket. I would like to have it as a drop-down user can select or start typing it should display matches. I found this code with a Behaviour script from the documentation. But's not working. I try to run the code from the console too and it is displaying the same error. Attaching screenshot. How I can fix it?

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.config.database.DatabaseConfigurationManager
import com.atlassian.jira.config.database.JdbcDatasource
import com.onresolve.scriptrunner.runner.rest.common.CustomEndpointDelegate
import groovy.json.JsonBuilder
import groovy.sql.GroovyRowResult
import groovy.sql.Sql
import groovy.transform.BaseScript

import javax.ws.rs.core.MultivaluedMap
import javax.ws.rs.core.Response
import java.sql.Driver

@BaseScript CustomEndpointDelegate delegate

eventTypes(httpMethod: "GET") { MultivaluedMap queryParams ->

def query = queryParams.getFirst("query") as String
def rt = [:]

def datasource = ComponentAccessor.getComponent(DatabaseConfigurationManager).getDatabaseConfiguration().getDatasource() as JdbcDatasource
def driver = Class.forName(datasource.getDriverClassName()).newInstance() as Driver

def props = new Properties()
props.setProperty("testuser", datasource.getUsername())
props.setProperty("fakepassword", datasource.getPassword())

def conn = driver.connect("jdbc:mysql://myDatabase:3306", props)
def sql = new Sql(conn)

try {
sql
def rows = sql.rows("SELECT FirstName, LastName from Person WHERE FirstName like ?", ["%${query}%".toString()])

rt = [
items : rows.collect { GroovyRowResult row ->
[
value: row.get("FirstName"),
html: row.get("FirstName").replaceAll(/(?i)$query/) { "<b>${it}</b>" },
label: row.get("FirstName"),
]
},
total: rows.size(),
footer: "Choose event type... "
]

} finally {
sql.close()
conn.close()
}

return Response.ok(new JsonBuilder(rt).toString()).build();
}

My second question is that is it possible to create a multi-select dropdown with help of a groovy script? Currently, there isn't a multi-select option in Jira Server. I'm looking to create a multi-select drop with 4,5 options.

Thank you for your help.