1)I m a bit confused about this fact..that ''to update data in thread safe manner ,it should be stored in ServletContext obj.!!''..but i read that it should be in SrevletContext are not thread safe ..but ServletRequest obj are.
2)can reserved words be used as prefix in taglib directive??
1.) ServletContext object has an application wide scope. This means that all servlets for a given application can see this object and access it's data members. Therefore a situation could arise, where two distinct requests serviced by the same or different servlets could change the value of a specific parameter held within the ServiceContext object. This problem can be overcome by synchronizing on the ServletContext object within the servlet code.
You can delete posts by editing them - there's a checkbox named "Delete this post" or something similar. Check that, submit the form, and -poof!- the post is gone.