Pass connection from Java Application to Birt report

Hello, I'm new to Birt.

I'm trying to pass the connection to the report from my java application, but I get an error:

The following items have errors:

ReportDesign (id = 1):
+ There are errors evaluating script "importPackage(Packages.it.lfiammetta.birt);
var conn = new ReportRenderer();
reportContext.getAppContext().put("OdaJDBCDriverPassInConnection", conn);":
Fail to execute script in function __bm_beforeOpen(). Source:
------
" + importPackage(Packages.it.lfiammetta.birt);
var conn = new ReportRenderer();
reportContext.getAppContext().put("OdaJDBCDriverPassInConnection", conn); + "
-----
A BIRT exception occurred. See next exception for more information.
Error evaluating Javascript expression. Script engine error: ReferenceError: "ReportRenderer" is not defined. (/report/data-sources/oda-data-source[@id="43"]/method[@name="beforeOpen"]#2)
Script source: /report/data-sources/oda-data-source[@id="43"]/method[@name="beforeOpen"], line: 0, text:
__bm_beforeOpen(). (Element ID:1)


This is my java code that creates and launches report:

package it.lfiammetta.birt;

public class ReportRenderer {
	public void executeReport() {
		code...
		
		Map<String, Object> appContext = task.getAppContext();
		appContext.put("OdaJDBCDriverPassInConnection", myConnection);
		appContext.put("OdaJDBCDriverPassInConnectionCloseAfterUse", false);
		task.setAppContext(appContext);

		task.run();
			
		code...
	}
}

This is the code I wrote in the script 'beforeOpen' the datasource:

importPackage(Packages.it.lfiammetta.birt);

var conn = new ReportRenderer(); 
reportContext.getAppContext().put("OdaJDBCDriverPassInConnection", conn);

I set the classpath.

Birt version I'm using is 4.2.1.

Thanks in advance for your help and I apologize for my English.