Py4JException: Method eClass([])/getMinValue([]) does not exist

Scripting
1

Hello Python4Capella

I am trying to export attributes of PhysicalQuantities in a project where has Capella 6.0.0 and Python4Capella 1.1.0.20220926. The related part of script is as below:

all_PhyQ = se.get_all_contents_by_type(PhysicalQuantity)

for elem in all_PhyQ:
print(elem.get_name()) # OK, output like ‘Voltage’
print(elem.get_unit().get_java_object().toString().split(“(name: “)[1].split(”)”)[0]) #OK, output like ‘V’
print(elem.get_kind().getName()) # NOK, error thrown as Py4JException: Method eClass([]) does not exist
print(elem.get_min_value()) # NOK, error thrown as Py4JException: getMinValue([]) does not exist

I searched through the Scripting section but I failed after trying to append eClass(), get_class(), Javalist mentioned in other topic.

I hope goodness can help me out. Thanks.

2

(1) From what I see, get_kind() is not defined on PhysicalQuantity class (incomplete API) so you should use elem.get_java_object().getKind() (not sure if you need a getName() after this)
(2) Same thing, you should use elem.get_java_object().getOwnedMinValue() and you’re going to get a list as a result (may be empty if no value)
Stephane

3

Thank you, Stephane and it works.

By the way, is there any way to find and check inherent APIs that are held by Java Object, which is returned by get_java_object()?

4

yes, I use 2 methods. First, I click on the desired model element in the project explorer and then:

  • either I open the property view and go to the “expert” tabs to see the properties of the element
  • or I open the “interpreter” view and type “aql:self”. There you should see the object you select displayed as a result in the interpreter view, then when you add a dot “.” and hit Ctrl+Space, you should see the completion popup that lists all the methods you can call

With this information, you can infer the Java API. Let’s say you see a property called “ownedPhysicalComponents”; this means that you can call getOwnedPhysicalComponents() on the Java object.

I hope this helps.
Stephane

1 Like