Remove exit process and instead throw / rethrow errors.

src/main/kotlin/mapping/MappingConfigurationParser.kt

@@ -23,7 +23,6 @@ import ch.memobase.mapping.fields.DirectMapField
 import ch.memobase.mapping.fields.FieldParsers
 import ch.memobase.mapping.fields.SimpleAnnotationField
 import ch.memobase.mapping.mappers.DateFieldMapper
-import kotlin.system.exitProcess
 import mapping.MapperConfiguration
 import mapping.MapperParsers
 import mapping.mappers.AbstractFieldMapper
@@ -58,22 +57,19 @@ class MappingConfigurationParser(data: ByteArray) {
                     else -> log.error("Top level definition of the mapping definition must be a map.")
                 }
             }
-        } catch (ex: InvalidMappingException) {
-            log.error("Invalid Mapping: " + ex.message)
-            exitProcess(1)
         } catch (ex: ClassCastException) {
             log.error("Invalid Structure: " + ex.message)
-            exitProcess(1)
+            throw InvalidMappingException("Invalid Structure: " + ex.message)
         }
         if (uriField == "") {
             log.error("Mapping is missing uri field in record, which is required.")
-            exitProcess(1)
+            throw InvalidMappingException("Mapping is missing uri field in record, which is required.")
         }
         if (localRecordType != null) {
             recordType = localRecordType as SimpleAnnotationField
         } else {
             log.error("Mapping is missing record.type field which is required.")
-            exitProcess(1)
+            throw InvalidMappingException("Mapping is missing record.type field which is required.")
         }
     }