import com.liferay.portal.security.audit.storage.service.AuditEventLocalServiceUtil;
import com.liferay.portal.security.audit.storage.model.AuditEvent;
import com.liferay.counter.kernel.service.CounterLocalServiceUtil;
import com.liferay.portal.kernel.security.auth.CompanyThreadLocal;
import com.liferay.portal.kernel.service.UserLocalServiceUtil;

int amount = 2000000;
long companyId = CompanyThreadLocal.getCompanyId();
long userId = UserLocalServiceUtil.getDefaultUserId(companyId);

try{
    for(int i=0; i<amount; i++){
        long auditEventId = CounterLocalServiceUtil.increment();
        AuditEvent auditEvent = AuditEventLocalServiceUtil.createAuditEvent(auditEventId);

        auditEvent.setCompanyId(companyId);
        auditEvent.setUserId(userId);
        auditEvent.setUserName("test");
        auditEvent.setCreateDate(null);
        auditEvent.setEventType("LOGIN");
        auditEvent.setClassName("com.liferay.portal.kernel.model.User");
        auditEvent.setClassPK(Long.toString(userId));
        auditEvent.setMessage(null);
        auditEvent.setClientHost("127.0.0.1");
        auditEvent.setClientIP("127.0.0.1");
        auditEvent.setServerName("localhost");
        auditEvent.setServerPort(8080);
        auditEvent.setSessionID("6D956EED6D1C52BB6E6B16629F040E4F");
        auditEvent.setAdditionalInfo(null);

        AuditEventLocalServiceUtil.addAuditEvent(auditEvent);

        System.out.println(i);
        }
    }
    catch(Exception e){
        e.printStackTrace();
        }
    finally{
        System.out.println("Finished!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
    }