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JavaSPOSH Bot Project: Pitfalls and Solutions

Learn about pitfalls faced while creating JavaSPOSH bots and how to solve them. Find tips on project setup, troubleshooting errors, and implementing actions and senses using the Java Reflection API.

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JavaSPOSH Bot Project: Pitfalls and Solutions

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  1. Creating JavaSPOSH bot project + pitfalls (S)POSH Reimplementing bots with SPOSH Faculty of mathematics and physics Charles University at Prague 16th April 2008 Pogamut 2Platform for fast development of cognitive agents inside 3D environment http://artemis.ms.mff.cuni.cz/pogamut

  2. JavaSPOSH bot project Select correct project type and read the description! http://artemis.ms.mff.cuni.cz/pogamut

  3. JavaSPOSH bot project Freshly created project is containing: • Main.java – main class that fires up the bot, containing path to the sposhPlan.lap (need to be configured! – next slide…) • MyBehavior.java – descendant of Behavior, containing actions and senses (implementations done here) • sposhPlan.lap – file containing SPOSH plan (decision tree of the agent)

  4. Running empty JavaSPOSH bot Not as easy as with JavaBot project. 1) we’re still have some nasty problem with build.xml (Ant script file firing the agent up), may be already corrected… 2) some project names gives the Python engine a headache 3) you have to correctly specified the path to the sposhPlan.lap file (for SPOSH-engine)

  5. JavaSPOSH bot project – Pitfall 1 3) We’re still have some troubles with build.xml file… 4) Take build.xml file from any Java Bot project (replace JavaSPOSH one with it). 2) No bot is running… 1) Even though BUILD is SUCCESSFUL http://artemis.ms.mff.cuni.cz/pogamut

  6. JavaSPOSH bot project – Pitfall 2 2) Bot failed to run 3) Python engine has tried to interpret \abc as a character and broken the path to the planfile 1) Even though BUILD is SUCCESSFUL http://artemis.ms.mff.cuni.cz/pogamut

  7. JavaSPOSH bot project – Pitfall 2 solution DO NOT create projects with names that begin with a, b, c, d, e, f … otherwise the Python engine will interpret \abcYourName as ‘\abc’YourName converting \abc to a wrong character and breaking the path. Project name ABC is WRONG Project name JavaSPOSHTest is OK http://artemis.ms.mff.cuni.cz/pogamut

  8. JavaSPOSH bot project – Pitfall 3 3) Because it couldn’t find the sposhPlan.lap file 2) Bot has failed to run… 1) Even though BUILD is SUCCESSFUL

  9. JavaSPOSH bot project – Pitfall 3solution Step-by-step: 1) open Main.java file and find getPlanFile() method 2) change “PROJECT_NAME” and “package_name” in this case to “JavaSPOSHExample” and “javasposhexample”

  10. JavaSPOSH bot project – Bot is running Congratulations!

  11. POSH parallel ordered slip-stack hierarchy • Dr. J. J. Bryson, University of Bath, UK • http://www.cs.bath.ac.uk/~jjb/web/posh.html • reactive planner • not fully reactive, you may store whatever variable in your Behavior • SPOSH – Strict POSH • more or less a decision tree with slip-stack • working with Behavior class that is containing actions and senses http://artemis.ms.mff.cuni.cz/pogamut

  12. POSH parallel ordered slip-stack hierarchy • Agent has: • goal to fulfill • we’re running endlessly so the goal is “fail” • ordereddrives • evaluated each POSH-engine iteration • competences • action patterns • Using (defined in Behavior): • senses – gives information from the environment • actions – primitives http://artemis.ms.mff.cuni.cz/pogamut

  13. POSH parallel ordered slip-stack hierarchy http://artemis.ms.mff.cuni.cz/pogamut

  14. POSH Syntax for HC people :-) http://artemis.ms.mff.cuni.cz/pogamut

  15. POSH parallel ordered slip-stack hierarchy Notice the corespondency between action / sense names in plan file and names of the methods in java source code. http://artemis.ms.mff.cuni.cz/pogamut

  16. Java SPOSH bot project Implementing actions / senses Implemented inside MyBehavior.java Java Reflection API is used. File MyBehavior.java • every action has prefix ‘action_’ • every sense has prefix ‘sense_’ • both are always without parameters, both HAS to return a boolean (success) • memory and body accessible through bot.getMemory() and bot.getBody() inside MyBehavior.java

  17. Java SPOSH bot project When the bot fails to run… 1) Bot builds ok 2) But fails to run 3) Examine Platform Log 4) Look for SEVERE entry with ‘Can’t instantiate SPOSH agent’ 5) Read the reason … here, we’ve got error in plan syntax

  18. Java SPOSH bot project How to test, how it works… Download the JavaSPOSHExample bot from the webpage. Where is the trick? Every action / sense that is firing is logging into User log that it fires. You’re free to examine how the SPOSH engine works Some hints: SPOSH engine first schedules some action / action pattern to be executed Then it executes all scheduled actions (e.g. action pattern will schedule more then one action)

  19. Java SPOSH bot project Remember FollowBot? Now the time has come! To become The One… Do you remember FollowBot from the second lecture? Good! Go and implement it using JavaSPOSH bot project. Good luck!

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