Simple Module application in Java 10 and Eclipse Oxygen 3a

In this post I show how in very simple way create module application in Java 10 using Eclipse IDE(Oxygen 3a).

Open IDE and select from main menu  File->New->Java Project.

java 10In the New Java Project window in Project Name field write name of the module. Convention of naming module is the same as package: domain plus other words. This module I named with  m1 at the end,

java 10Click the Finish button. In Package Explorer right click name your module(project name) and choose New->Class to create your first class in this project.

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In the New Java Class window in Package field write name of package for this class. In the Name field write name of the class.

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Click the Finish button. In Hello.java file  write method return String. I named this method sayHello.

OK. In this module you have one class: Hello. Now we have to create module descriptor. Each module must have one module descriptor(module-info.java). Right click the module name and choose Configure->Create module-info.java.

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In New module-info.java window in Module name field write name of module. Default name may be correct.

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Click the Finish button.

In module body write exports with name of package with the class. This package you want to export to outside to use through other modules.

In next step create other module(project). Open IDE, select from main menu File->New->Java Project.

java 10In the New Java Project window in Project Name field write name of the module. Convention of naming module is the same as package: domain plus other words. This module I named with m2 at the end.

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Click the Finish button.

Now we have to create module descriptor. Each module must have one module descriptor(module-info.java). Right click the module name and choose Configure->Create module-info.java.

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In New module-info.java window in Module name field write name of module. Default name may be correct.

Click the Finish button. In body of this module write requires and name of the module. This module m1 need module m2 to use packages. Our m2 module use m1 module, which delivers net.doraprojects.hello package with Hello class.

Create main class in m2 module: HelloClient.

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Click the Finish button.

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In main method this class create instance Hello class from m1 module and net.doraprojects.hello package. Call sayHello method this object in System.out.print method.

In third step you have to connect these modules. The m2 module need m1 module to use Hello object. So right click the name of the m2 module and select Properties.

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In Properties window select Java Build Path, go to Projects tab and click the Modulepath.

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Click the Add button. Select  name of module to add and click OK button.

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Click the Apply button and the Apply and Close button.

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Select main class and Run it.

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In Output window you see text come from m1 module from Hello object.

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