Re: [Jython-dev] MINI-PEP: Alternative to jar scanning.

[Samuele P. <pe...@in...>]

 Hi.

 I'm a bit unhappy with the actual form of the proposal.
 It seems more a mixture/mismatch beetween things that are
 good for jython -jar and some that are good for java -jar ...

 > The JYTHON-PACKAGE-* entries will be used by the package-manager's
 > packageExists()
 That's neat.

 >
 > The RunJar startup utility shows how /applications/ can be deployed
 > using the "java -jar" syntax. An index is generated of all the java
 > packages in the java system and stored in the main jar file together
 > with manifest file like this:
 >
 >     Name: python.main
 >     Main-Script: mytest.py
 >
 >     Name: python.options
 >     python-security-respectJavaAccessibility: true
 >     python-skipcachedir: true
 >     python-prepath:
 >     python-path: mytest.jar
 >
 > (notice that the jar file that includes the $py.class files must be
 > available on sys.path.
 That's the critical part. It seems that the CWD should be
 the directory with the jar otherwise java -jar will fail ... or
 I'm mislooking something.

 > We can't load python modules from resources yet
 I don't even know if that would be a good idea, maybe we should just load
 them through the Java system classloader as happen with jythonc-ed code.

 >
 > Problems:
 >
 > - Because the JYTHON-PACKAGE-* files is found as resources, only one
 > version of a package index can be loaded. If the classes in a
 > javapackage is split over more than one jar file, only the class files
 > in the first jar will be loaded with "import *" and show up in
 > dir(javapackage).
 That's not a big problem,
 if you're using java -jar there is just one jar up to java extensions...
 or are you referring to jars on sys.path? but then getClass() in the
 patch is suboptimal.

 > - The tool only scan jar and zip files when making the index. It does
 > not scan directories on the class path.
 This make sense.

 >
 > - Python module can not be loaded as resources, so none of this helps
 > with the applet situation.
 But IMHO the solution for applets should be the same for java -jar
 vs. the solution for jython -jar ...

 regards.