Methods of specifying Jython settings
preProperties, typically Java system properties specified with -D before class/jar specification on Java command line
Registry: property files registry in Jython root and .jython in user.home; if both are present, the latter replaces the former completely. If either is present, the Java system properties are replaced entirely. (This is likely a bug in PySystemState.addRegistryFile.) See Finding the Registry File for more information.
postProperties, typically Jython properties specified with -D after class/jar specification on Java command line (these overwrite Java system properties, too.)
For preProperties and postProperties, alternate properties may be passed to PySystemState.initialize or PythonInterpreter.initialize by programmatic users of Jython.
The runtime registry (PySystemState.registry from Java, or sys.registry from Python) is created from the above three sources.
Other command-line arguments are written directly into Options static variables without going through the properties system; the overlapping properties are python.divisionWarning, python.options.Qnew and python.verbose. In these overlapping cases, the above three sources always take precedence over the command-line equivalents. (This precedence should likely be reversed.)
Documentation
The options whose destinations are static variables in the Options class are well-documented there.
The default registry file is severely bitrotted and needs redoing.
The Jython user guide refers to a subset of these properties.
Source
Destination
Default
install.root
python.console.readlinelib
python.deprecated.keywordMangling
Options.deprecatedKeywordMangling
false
python.divisionWarning
Options.divisionWarning
python.options.Qnew
Options.Qnew
false
python.options.caseok
Options.caseok
false
python.options.compileClass
unused; in default registry file
false (in registry file)
python.options.includeJavaStackInExceptions
Options.includeJavaStackInExceptions
true
python.options.proxyDebugDirectory
Options.proxyDebugDirectory
null
python.options.showJavaExceptions
Options.showJavaExceptions
false
python.options.showPythonProxyExceptions
Options.showPythonProxyExceptions
false
python.os
os._name
"posix"
python.path {X}
end of path after JYTHON_JAR/Lib
""
python.prepath (python.path in r5043+)
beginning of path after current dir
""
python.security.respectJavaAccessibility
Options.respectJavaAccessibility
true
python.verbose
Options.verbose
Py.MESSAGE = 1
python.xml.sax.parser
xml.sax.default_parser_list (split)
PY_SAX_PARSER, else xml.sax.drivers2.drv_javasax
{X} gone in Jython 2.5 or later