I encountered a synchronization related problem
whereby code which creates a file directly in the
project file system (containers) and then attempts
to obtain an entry from the project environment
sometimes does not succeed. The code slice is
listed below. The problem appears to be in the
ProjectMember.Environment.beforeLookup. The
following sequence of events would cause a problem
on an uninitialized project member:

Thread1
  beforeLookup
     if (getLookup().length == 0) // true
      // item is valid
      if (!environmentConstruction) 
        environmentConstruction = true;
surrenders control

Thread2
   beforeLookup
     if (getLookup().length == 0) // true
      // item is valid
      if (!environmentConstruction) 
       
returns empty lookup.


I have attached a patch which passed the unit
tests and resolves the problem on the target system.


Example code slice.

FileObject fo =
containers.createData(resourceName,   RESOURCE_EXT);
ProjectMember pm = p.getProjectMember(fo);
ResourceDescriptor resource = (ResourceDescriptor)
                 
pm.getLookup().lookup(ResourceDescriptor.class);