The specification for java.util.jar.Pack200.Packer states since JDK7 b100:
http://download.java.net/jdk7/docs/api/java/util/jar/Pack200.Packer.html#SEGMENT_LIMIT
"The default is -1, which means the packer will always create a single segment output file."

However the call Pack200.newPacker().properties().get(Packer.SEGMENT_LIMIT) returns empty string instead of -1.