Skip to content

java-module.md

Latest commit

 

History

History
executable file
·
70 lines (59 loc) · 1.71 KB

java-module.md

File metadata and controls

executable file
·
70 lines (59 loc) · 1.71 KB
Raw

Java Module

This package is so light on dependencies that I have not bothered modifying the Maven build to "properly" enable module support. Instead, I simply put the module-info.java file in src/main/java11 and manually compiled it into the src/main/resources directory so that it gets included in the JAR file.

javac -source 11 -target 11 -encoding utf8 \
      -d src/main/resources \
      -sourcepath src/main/java:src/main/java11 \
      src/main/java11/module-info.java

The only non-core dependency in the production code is the @Generated annotation on the CountryCodesData class. This annotation has "source" retention, and therefore has no effect on the compiled module.

Testing

Here's a simple testing project, ran using JDK 14.0.2:

.
+-- module/
|   +-- iban-1.7.0.jar
+-- src/
|   +-- module-info.java
|   +-- com/
|       +-- example/
|           +-- Main.java
+-- target/

// module-info.java
module com.example {
  requires nl.garvelink.iban;
}
// Main.java
package com.example;

import nl.garvelink.iban.*;

public class Main {
  public static void main(String[] args) {
    if (args.length < 1) {
      System.err.println("Need at least one command-line argument");
      System.exit(1);
    }
    for (String arg : args) {
      try {
        IBAN iban = IBAN.valueOf(arg);
        System.out.println("Valid: " + arg + " -> " + iban);
      } catch (Exception e) {
        System.out.println("Not valid: " + arg + " -> " + e.toString());
      }
    }
  }
}

Compile and test:

javac -d target -source 11 -target 11 --source-path src --module-path ./module **/*.java
java --module-path ./module/:./target --module com.example/com.example.Main NL0012345