location specifies the directory where uploaded files will
be stored. When not specified, a temporary directory will be used.
max-file-size specifies the maximum size permitted for
uploaded files. The default is 1MB
max-request-size specifies the maximum size allowed
for multipart/form-data requests. The default is 10MB.
file-size-threshold specifies the size threshold
after which files will be written to disk. The default is 0.
These properties are ultimately passed to MultipartConfigFactory which means
you may specify numeric values using long values or using more readable
String variants that accept KB or MB suffixes.