Programming Tutorials

  Processing multi-megabyte CSV files or deeply nested JSON architectures directly within Salesforce has historically been a perilous task. Developers frequently encounter   System.LimitException: Too many heap size   or   System.LimitException: Apex CPU time limit exceeded   when attempting to parse and transform this data. Traditional approaches relying on standard string manipulation or regex fail to scale gracefully. By leveraging DataWeave in Apex, data engineers and Salesforce developers can offload complex payload transformations to a purpose-built engine, drastically reducing CPU time and memory consumption. The Core Problem: Heap Limits and Immutable Strings To understand why it is so difficult to parse CSV Salesforce Apex implementations natively, we must look at how the JVM-backed Apex runtime manages memory. Strings in Apex are immutable. When you attempt to parse a CSV using  String.split('\n') , the runtime does not simply place pointers acros...