A DESCRIPTION OF THE REQUEST :
ProcessBuilder handles command arrays. It should also provide a way to handle a single string that includes its arguments (e.g. "ls -l").

JUSTIFICATION :
ProcessBuilder provides a higher-level way to exec system commands. However, there are cases where a command is only available as a String that includes its arguments. In these cases, it is not possible to take advantage of ProcessBuilder's features, even though the older, more complex System.exec() handles it.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
ProcessBuilder should provide constructors and command() getters and setters that handle a single string command (e.g. "ls -l"). It would be acceptable for the command(String) to convert the command to a list internally using system-dependent methods.
ACTUAL -
ProcessBuilder cannot be used for single-string commands (e.g. "ls -l").

CUSTOMER SUBMITTED WORKAROUND :
You have to write OS specific code to parse the single string command into arguments, or execute the command using a shell command.