7 FastJar is an attempt at creating a feature-for-feature copy of Sun's JDK's
8 'jar' command. Sun's jar (or Blackdown's for that matter) is written entirely
9 in Java which makes it dog slow. Since FastJar is written in C, it can create
10 the same .jar file as Sun's tool in a fraction of the time. On my system,
11 Sun's jar takes 50 seconds to create a 10MB jar file, while FastJar only takes
12 a little over a second.
14 The reason I wrote fastjar is that building .jar files is a regular process
15 of the build where I work. The way we have it setup, you have to re-create
16 the .jar file everytime you want to test it out, which is about every 5 minutes
17 when I'm busy coding. The .jar file wasn't -that- big, but it did take about
18 30 seconds to be made, and watching all the garbage collection messages was
19 pretty irritating as well. I probably wasted a half-hour a day watching
20 Sun's jar tool chug along. By writing the program in C, I spend much less time
21 banging my head against the monitor waiting for the build to finish. Yay!
23 FastJar has been tested on Solaris and Linux 2.2.x systems and nothing else.
24 It should compile/run without any problems on either system, provided you have
27 Please mail any bug reports to burnsbr@ucs.orst.edu.
29 If you use FastJar and want me to add the rest of the features, send me mail
30 (toast@users.sourceforge.net). I'll be much more likely to put more work into this
31 if I know other people find it useful other than me.
33 As always, this not being a final release, bugs may exist. I test each
34 release pretty well, but I can always miss things...
36 Compression will slow things down quite a bit. A 10MB jar file takes about
37 1 second on my machine without compression, and 9 seconds with it. If you
38 want fastjar to be fast, use the -0 (zero, not O) flag to turn off compression.
41 --------------------------
42 -c | create a new archive
44 -f | specify archive file name
45 -m | specify existing manifest file
46 -M | don't create manifest
53 ----------------------------
54 -u | update exisiting archive
56 If you use the "unsupported" flags, nothing bad will happen, but then again
57 nothing will happen at all.
60 Unsupported features (in this release):
61 ---------------------------------------------
63 * full manifest support (?)
65 Order or features for the future:
66 --------------------------------------------
68 * full manifest support
73 ===========================================================================
74 http://fastjar.sourceforge.net
75 toast@users.sourceforge.net