fix bad constructor

openeogeotrellis/backend.py

@@ -1309,7 +1309,7 @@ def accept_process_graph(cls, process_graph, default_input_parameter = None, def
         if len(process_graph) == 1 and next(iter(process_graph.values())).get('process_id') == 'run_udf':
             return SingleNodeUDFProcessGraphVisitor().accept_process_graph(process_graph)
 
-        return GeotrellisTileProcessGraphVisitor().accept_process_graph(process_graph)
+        return GeotrellisTileProcessGraphVisitor.create(default_input_parameter=default_input_parameter,default_input_datatype=default_input_datatype).accept_process_graph(process_graph)
 
     def summarize_exception(self, error: Exception) -> Union[ErrorSummary, Exception]:
         return self.summarize_exception_static(error, 2000)

openeogeotrellis/processgraphvisiting.py

@@ -15,13 +15,14 @@ def __init__(self, _builder=None):
         # process list to keep track of processes, so this class has a double function
         self.processes = OrderedDict()
 
-    def __init__(self, default_input_parameter = None, default_input_datatype=None):
+    @classmethod
+    def create(cls, default_input_parameter = None, default_input_datatype=None):
         builder = get_jvm().org.openeo.geotrellis.OpenEOProcessScriptBuilder()
         if default_input_datatype is not None:
             builder.setInputDataType(default_input_datatype)
         #if default_input_parameter is not None:
         #    getattr(builder, "defaultDataParameterName_$eq")(default_input_parameter)
-        self.__init__(builder)
+        return cls(_builder=builder)
 
     def enterProcess(self, process_id: str, arguments: dict, namespace: Union[str, None]):
         self.builder.expressionStart(process_id, arguments)