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Using this to get below working:

    public class t12345 implements Database.Batchable<sObject> {
    
        String query;
        Boolean xyz;
        
        public t12345(String query){
            this.query= query;
        }

public Database.QueryLocator start(Database.BatchableContext bC){      
    return Database.getQueryLocator(query);
}
    }

and when I run below from developer console,

    Type api = Type.forName('t12345');
    Object apiCall = JSON.deserialize('{"abc":"hello world"}',api);
Database.executeBatch((Database.Batchable<sObject>) apiCall);

above execution results in error Argument 1 cannot be null which is coming from start method of batch where query value is still null as constructor with query is not invoked

Using this to get below working:

    public class t12345 implements Database.Batchable<sObject> {
    
        String query;
        Boolean xyz;
        
        public t12345(String query){
            this.query= query;
        }

public Database.QueryLocator start(Database.BatchableContext bC){      
    return Database.getQueryLocator(query);
}
    }

and when I run below from developer console,

    Type api = Type.forName('t12345');
    Object apiCall = JSON.deserialize('{"query":"hello world"}',api);
Database.executeBatch((Database.Batchable<sObject>) apiCall);

above execution results in error Argument 1 cannot be null which is coming from start method of batch where query value is still null as constructor with query is not invoked

Using this to get below working:

    public class t12345 {
    
        String abc;
        Boolean xyz;
        
        public t12345() {
            system.debug('called');
        }
        
        public t12345(String abc){
            this.abc = abc;
            system.debug(abc);
system.debug('hello');
        }
    }

and when I run below from developer console,

Type api = Type.forName('batchclass');
//api.newInstance(); --> this outputs "Called" in default constructor as expected
Object apiCall = JSON.deserialize('{"abc":"hello world"}',api);
system.debug(apiCall);
system.debug(apiCall != null); //executes as true

I am trying to output debug in parameterized constructor.

apiCall returns object and I want to call my batch using that object as belo: Database.executeBatch((Database.Batchable<sObject>) apiCall);

above execution results in error Argument 1 cannot be null which is coming from start method of batch which is using abc

Using this to get below working:

    public class t12345 implements Database.Batchable<sObject> {
    
        String query;
        Boolean xyz;
        
        public t12345(String query){
            this.query= query;
        }

public Database.QueryLocator start(Database.BatchableContext bC){      
    return Database.getQueryLocator(query);
}
    }

and when I run below from developer console,

    Type api = Type.forName('t12345');
    Object apiCall = JSON.deserialize('{"abc":"hello world"}',api);
Database.executeBatch((Database.Batchable<sObject>) apiCall);

above execution results in error Argument 1 cannot be null which is coming from start method of batch where query value is still null as constructor with query is not invoked

Using this to get below working:

    public class t12345 {
    
        String abc;
        Boolean xyz;
        
        public t12345() {
            system.debug('called');
        }
        
        public t12345(String abc){
            this.abc = abc;
            system.debug(abc);
system.debug('hello');
        }
    }

and when I run below from developer console,

Type api = Type.forName('t12345');
//api.newInstance(); --> this outputs "Called" in default constructor as expected
Object apiCall = JSON.deserialize('{"abc":"hello world"}',api);
system.debug(apiCall);
system.debug(apiCall != null); //executes as true

I am trying to output debug in parameterized constructor.

apiCall returns object and I want to call my batch using that object as belo: Database.executeBatch((Database.Batchable<sObject>) apiCall);

Using this to get below working:

    public class t12345 {
    
        String abc;
        Boolean xyz;
        
        public t12345() {
            system.debug('called');
        }
        
        public t12345(String abc){
            this.abc = abc;
            system.debug(abc);
system.debug('hello');
        }
    }

and when I run below from developer console,

Type api = Type.forName('batchclass');
//api.newInstance(); --> this outputs "Called" in default constructor as expected
Object apiCall = JSON.deserialize('{"abc":"hello world"}',api);
system.debug(apiCall);
system.debug(apiCall != null); //executes as true

I am trying to output debug in parameterized constructor.

apiCall returns object and I want to call my batch using that object as belo: Database.executeBatch((Database.Batchable<sObject>) apiCall);

above execution results in error Argument 1 cannot be null which is coming from start method of batch which is using abc