BatchApexErrorTrigger.trigger

trigger BatchApexErrorTrigger on BatchApexErrorEvent (after insert) {
    
    List<BatchLeadConvertErrors__c> errors = new List<BatchLeadConvertErrors__c>();
    
    for(BatchApexErrorEvent event : Trigger.New) {
    	BatchLeadConvertErrors__c blcerror = new BatchLeadConvertErrors__c();
    	blcerror.AsyncApexJobId__c = event.AsyncApexJobId;
    	blcerror.Records__c = event.JobScope;
	    blcerror.StackTrace__c = event.StackTrace;
        errors.add(blcerror);
    }
    if (errors.size() > 0) {
	    insert errors;
    }
}

BatchLeadConvert.cls

public with sharing class BatchLeadConvert implements Database.Batchable<SObject>, Database.RaisesPlatformEvents {

    private final String CONVERTED_STATUS = [SELECT Id, MasterLabel FROM LeadStatus WHERE IsConverted=true LIMIT 1].MasterLabel;

    public Database.QueryLocator start(Database.BatchableContext ctx){
        return Database.getQueryLocator([SELECT Id FROM Lead WHERE ConvertedContactId = null]);
    }

    public void execute(Database.BatchableContext ctx, List<Lead> records){
        List<Database.LeadConvert> leadConverts = new List<Database.LeadConvert>();
        for(Lead record:records){
            Database.LeadConvert lc = new Database.LeadConvert();
            lc.setConvertedStatus(CONVERTED_STATUS);
            lc.setLeadId(record.Id);

            leadConverts.add(lc);
        }
        Database.convertLead(leadConverts, true);
    }

    public void finish(Database.BatchableContext ctx){

    }
}

requirement.md

Modify an existing batch Apex job to raise BatchApexErrorEvents

Take an existing batch Apex job class and update it to implement the Database.RaisesPlatformEvents interface. Then, add a trigger on BatchApexErrorEvent that logs exceptions in the batch job to a custom object.

• Update the BatchLeadConvert class to implement the Database.RaisesPlatformEvents marker interface.
• Create an Apex trigger called BatchApexErrorTrigger on the BatchApexErrorEvent SObject type. For each event record, capture the following fields and save them to the corresponding fields in a new BatchLeadConvertErrors__c record.
  • AsyncApexJobId: AsyncApexJobId__c
  • JobScope: Records__c
  • StackTrace: StackTrace__c
• To make the trigger bulk safe, use a single DML statement to insert a list of new records at the end.