Bug ID: JDK-8136930 Simplify use of module-system options by custom launchers

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JDK 9
9 b132Fixed

System.getProperties has an @implNote to document the system properties: jdk.module.path, jdk.upgrade.module.path, jdk.module.main, and jdk.module.main.class.

We need to think through scenarios where custom launchers might need to do the equivalent of the java -X options, -XaddExports for example. At this time, then the system properties used to communicate the values of -XaddExports, -Xpatch etc are JDK-internal.

Eclipse issue related to the -addmods flag
23-06-2016
Added JDK-8156998 related to JDK-8156962
14-05-2016
The current proposal is to push handling of the module options into the VM. That will avoid the confusion between launcher and VM options and avoids needing to use awkward system properties. For javac, Jon has created JDK-8156962 to add an environment variable for the compilation environment and that may (needs investigation) provide a way to pick up or merge in configuration from the runtime environment.
14-05-2016
We should also decide/document whether the system properties can be used to inject values into a JVM (i.e. using -D as an alternative to options), or are they merely for code in a JVM to access values that were set by options. If values can be injected via -D, what is the relationship between properties and the equivalent options, and how do the uniqueness constraints play out?
20-04-2016
As things stand, we have: 1. java and javac have @argfile support 2. VM has -XX:VMOptionsFile=<file> which is like @argfile. 3. VM has _JAVA_OPTIONS and JAVA_TOOLS_OPTIONS (the latter specified in the JVM TI spec). The value of the env variable can include -XX:VMOptionsFile=<file> so it's possible to use _JAVA_OPTIONS="-XX:VMOptionsFile=project-options".
18-04-2016
One scenario is Oracle JDeveloper on Windows which has a custom launcher. For JDK9 we definitely need -XaddExports and -Xpatch.
04-03-2016

Blocks :	JDK-8163316 - Update FX to use new gnu style java command line options
Blocks :	JDK-8160727 - Add new format arguments to the list of secure VM arguments
Blocks :	JDK-8155401 - Move from ALL-SYSTEM to ALL-DEFAULT
Duplicate :	JDK-8164049 - runtime/BootClassAppendProp/BootClassPathAppendProp.java
Relates :	JDK-8157789 - Nashorn sample/test.js should not use undocumented System property
Relates :	JDK-8160851 - Remove old launcher module-related options
Relates :	JDK-8158076 - Examine different argfile support in VM, launcher, javac
Relates :	JDK-8153077 - Allow -XaddExports be specified via the java-vm-args attribute
Relates :	JDK-8173128 - hotspot doesn't recognise new jigsaw options passed through _JAVA_OPTIONS
Relates :	JDK-8157038 - Move module option handling from java launcher to VM
Relates :	JDK-8154398 - Support nested argument files
Relates :	JDK-8156962 - javac should support options specified in _JAVAC_OPTIONS
Relates :	JDK-8243936 - NonWriteable system properties are actually writeable
Relates :	JDK-8154426 - Allow the equivalent of -XaddExports in the manifest of an application JAR file