How to pass String parameter from Test Stand to Java API and from Java API back to Test Stand?

[Lilyli]

Greeting!

I want to pass parameters between Test Stand and Java API. I tried the java example Computer.java in TestStand 3.5\Examples\Java. It seems in this example, there are Numeric Limit Test used. However, I searched through all the static method step and can not fine a proper one supporting String paramer passing.

Can any experts give me suggestions on how to do this and how to set configuration in the Test Stand?

Thank you very much!

[Brandon_V]

Lilyli,

This example is just a basic example in using Java with TestStand, passing parameters as strings is not very different from passing ints or other data types. The String Value Test step type and method show how to do this in those specific cases as well. Were you getting some sort of error when trying this? Also, have you looked at the ReadMe for this example? The ReadMe has a lot of useful information about this example and how to use step types.

[Lilyli]

Hola Brandon,

I just added the following code to computer.java and recompiled computer.class:

public String LiliTest(String TestString) {
  return TestString;
  }

The call to the step is shown in the ni2.jpg picture. I added two string variables Locals.InputString and Locals.OutputString. I set the Expressions->Status Expression to "Passed" with no preconditions and I am getting the error shown in the picture ni.jpg, do I need to do else with the class?

[Brandon_V]

Are you sure you're pointing to the correct .class file? This error means there is no method by this name located in that .class file. I added your code and recompiled and could not replicate this error.

[Lilyli]

Yes, I am sure I pointed to the correct .class file. I also use the find in TestStand to make sure that I have changed all the occurence of "Java Class to load".

The error dialog said:

Details: Error executing substep 'Post'

Cannot find class

Error Code: -1500; User-defined error code

Location: Step 'Get Power On' of sequence 'MainSequence' in 'Computer3.seq'

It is interesting that I do not meet any error dialog when I run the Computer.java example. I changed some code in the Computer.java as I described in the previous messages and recomplie the class. I also point to the updated .class file in TestStand. Then I will see the error dialog. This problem is not solved even after I close down and restart TestStand. (I guess there might be memeory leaking problem since I saw memory leaking warning when closing TestStand).

Could this problem relate to the class loader issue? if so, how should I config the TestStand to load the class properly?

I appreciate your help and looking forward to your suggestion.

[TerryS]

Hi Lilyli,

Are you still receiving this error?  I tested this out making the exact changes you did and was able to pass a string in and out of a java code module with no problem.  If you are still getting this error, double check to make sure that you are calling the new .class that was created.