null
. In this case runnable
will be executed normally, but without cancel and progress support.
@param task the task to be executed, can be null
.
@param runnable the runnable to be executed
@param taskName the name of the task, is displayed in the status bar if available
@param errorHandler error handler for exception retrieval during execution
@throws NullPointerException if runnable
or taskName
is null
@throws IllegalStateException if a task is still executing at this time
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