in src/main/java/org/apache/sling/engine/impl/parameters/ParameterSupport.java [159:169]
static void configure(final long maxRequestSize, final String location, final long maxFileSize,
final int fileSizeThreshold,
final boolean checkForAdditionalParameters,
final long maxFileCount) {
ParameterSupport.maxRequestSize = (maxRequestSize > 0) ? maxRequestSize : -1;
ParameterSupport.location = (location != null) ? new File(location) : null;
ParameterSupport.maxFileSize = (maxFileSize > 0) ? maxFileSize : -1;
ParameterSupport.fileSizeThreshold = (fileSizeThreshold > 0) ? fileSizeThreshold : 256000;
ParameterSupport.checkForAdditionalParameters = checkForAdditionalParameters;
ParameterSupport.maxFileCount = (maxFileCount > 0) ? maxFileCount : 50;
}