Hi Jose, The problem you ran into is described in chapter 14 of the new Ptolemy book, page 517, available for download here: http://ptolemy.eecs.berkeley.edu/books/Systems/chapters/TheTypeSystem.pdf
In summary, due to the nature of the JSONToToken actor (it takes an arbitrary string, interprets it as JSON, and then creates a record token out of it), the type system has no means infer the shape of record that JSONToToken outputs. To fix this, you can either declare a type manually, or enable backward type inference (right-click on the canvas of the composite actor ->Customize->Configure, then check the box in front of the parameter enableBackwardTypeInference). The latter solution lets the type of the port JSONToToken.output be inferred by means of downstream type constraints, resulting in a type that reflects the requirements of downstream actors that operate on the token. In the given example, JSONToToken.output will resolve to type general, as the downstream Display actor accepts any token. Best, Marten -- Marten Lohstroh, Msc. | Associate Specialist University of California | 545Q Cory Hall Berkeley, CA 94720 | +1 510 282 9135 -------- Original Message -------- Subject: [kepler-users] TokenToJSON > followed by JSONToToken results in error Date: Thu, 17 Oct 2013 15:43:05 > -0400 From: Jose Borreguero <borregu...@gmail.com> <borregu...@gmail.com> > To: > kepler-users > <kepler-users@kepler-project.org><kepler-users@kepler-project.org> > > Dear Kepler users, > > I am having trouble with the conversion from JSON to Token. As a test, > I created a very simple workflow that results in error: > > 1- I packed an integer and a string with Actor "Record Assembler" into a > record > 2- I apply Actor "TokenToJSON" to output of "Record Assembler" > 3- I apply Actor "JSONToToken" to output of "TokenToJSON" > 4- I apply Actor "Display" to output of "TokenToJSON" > > This is the error stack Trace: > ptolemy.actor.TypeConflictException: Types resolved to unacceptable types > in .Unnamed3 due to the following objects: > (port .Unnamed3.JSONToToken.output: unknown) > at > ptolemy.actor.TypedCompositeActor.resolveTypes(TypedCompositeActor.java:406) > at ptolemy.actor.Manager.resolveTypes(Manager.java:1140) > at ptolemy.actor.Manager.preinitializeAndResolveTypes(Manager.java:976) > at ptolemy.actor.Manager.initialize(Manager.java:659) > at ptolemy.actor.Manager.execute(Manager.java:340) > at ptolemy.actor.Manager.run(Manager.java:1191) > at ptolemy.actor.Manager$PtolemyRunThread.run(Manager.java:1734) > > Any help or hints to debug this, please? > > Best regards, > -Jose Borreguero > > > > > >
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