How to Declare Modules in java 9 -


i want use java 9 modules in project. want put data , service classes (in package named com.test.base) in 1 module named (base), , put other things main class , gui (in package named com.test.main) in module named (main).

  • how declare simple module (base)?
  • how declare module (main) dependency of (base) module?

  • i want use (base) module reflection.

  • assume root package com.test directory structure should use these modules?

the jigsaw quick-start nice place start off out. answer specific questions:

how declare simple module (base)?

create class named module-info.java within com.test.base directory definition as:

module base {      exports com.test.base; }

this exports com.test.base package.

how declare module (main) dependency of (base) module?

same other module base class named module-info.java within com.test.main directory definition as:

module main {     requires com.test.base; }

makes use of exported package.

i want use (base) module reflection.

depending on yoru usage, if api os removed or changes listed here, can use --add-exports java option detailed in jep-261

i suggest reading nicolai's answer how solve inaccessibleobjectexception ("unable make {member} accessible: module {a} not 'opens {package}' {b}") on java 9? nice explanation on how make use of reflection in java-9.

the correct fix launch jvm follows:

--add-opens has following syntax: {a}/{package}={b}  java --add-opens java.base/java.lang=all-unnamed

if reflecting code in named module, all-unnamed can replaced name.

assume root package com.test directory structure should use these modules?

your directory structure should like:

src/main/java  - com.test    - base      - module-info.java      - com/test/base/main.java    - main      - module-info.java      - com/test/main/simpleclass.java

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