The `get` and `set` methods were removed from the model API. Instead of `process.getExchanges()` you write now `process.exchanges`. You can have a look at the core-model package (https://github.com/GreenDelta/olca-modules/tree/master/olca-core/src/main/java/org/openlca/core/model) where these classes are defined for the current API version.