How to get the current running activity , suspend it and then restart it?

hi everybody,
i'm new in the Bpel world so please try to help me ...
So my question is how, while a bpel process is running, can i get the activity currently running...and if there is a problem while the execution i can get where exactly did the process stopped and i could restart it?
i know these are lot of questions but any thing could help....
thanks in advance

i already tried JAVA BPEL PM API i wrote the code but i didn't test it yet...
since i don't know yet how to write a hole project running in the oracle server i couldn't konw if my code is running or not???
Locator locator = new Locator("default","bpel");
WhereCondition where = WhereConditionHelper.whereActivitiesOpen();
IActivityHandle[] activityHandles=locator.listActivities(where);
System.out.println("state of an activity "+ activityHandles[2].getState()+ " " +activityHandles[2].getLabel());
but to know which activity was running when a problem occured...i'll give a look to the file you gave me about bpel fault policies....
but to restart the process with java code from specific activity...i didn't find in the API something to do this..
so may be you could help in this point???
thanks in advance

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