A breapoint's suspend policy determines what should be suspended when a breakpoint is hit.
There are two options for Java breakpoints:
This option can be changed in the Breakpoints View detail pane, with the Breakpoint Properties..., or by right-clicking a breakpoint.
You can also change the default setting for the suspend policy for all newly created breakpoints.
To do this go to the 
Java >Debug preference page and change it there.