Unable to get Java modular project to run on NetBeans 11.1

[Biniman Idugboe]

I am trying my hands on a very rudimentary Java modular project using openJDK14 on NetBeans 11.1.  However, it is turning out to be an exercise in futility. Each time I try to run the project, I get the message shown on the image insert below.  I need help and so I have attached the project layout in case somebody wishes to look at what I may be doing wrong.

[Biniman Idugboe]

Error message is shown below.

[Stephan van Hulst]

I can run your application just fine. I'm on NetBeans 11.2 and I'm using OpenJDK 13.0.1.

I don't think it has to do anything with the module system. Maybe your NetBeans version is not compatible with your Java version. Java 14 is really new, and IDEs tend to lag behind a few months before they fully support a new platform version.

I suggest trying to run NetBeans on Java 13, and the project as well.

Additionally, I strongly advise using Maven to build your application instead of Ant.

[Biniman Idugboe]

Apology for the slow response.  I was actually trying out the recommendations.  Unfortunately, non has worked for me.  I have even downloaded and tried Apache NetBeans 11.3 to run the Java module project.  No luck! Things are getting for very frustrating. Does it have anything to do with the operating system?  I am using Windows 10, 64-bits edition, with latest updates. I mean, if I cannot successfully run such rudimentary program, I am beginning to feel that there is little hope for me in learning Java.

As for building Java programs on Maven, I have never been able to succeed in that too.  Example, look at the image insert below.  Each time I try creating Java program based on Maven, I get the following errors:

------------------------------------------------------------------------
Building mavenproject2 1.0-SNAPSHOT
------------------------------------------------------------------------
Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom

------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Total time: 1.672 s
Finished at: 2020-04-21T11:59:45+01:00
Final Memory: 7M/27M
------------------------------------------------------------------------
Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-clean-plugin:jar:2.5: Could not transfer artifact org.apache.maven.plugins:maven-clean-plugin:pom:2.5 from/to central (https://repo.maven.apache.org/maven2): No such host is known (repo.maven.apache.org) -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException

[Stephan van Hulst]

Please show Tools -> Options -> Java -> Maven.

Also show your Maven POM by copying and pasting it (no screenshot). Use [code=xml]<pom contents>[/code].

[Biniman Idugboe]

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.mycompany</groupId>
   <artifactId>mavenproject2</artifactId>
   <version>1.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
       <maven.compiler.source>13</maven.compiler.source>
       <maven.compiler.target>13</maven.compiler.target>
   </properties>
</project>

[Stephan van Hulst]

Why do you have the experimental features enabled?

Anyway, like I said before, download Java 13 and try that. I'm not sure if NetBeans supports Java 14 yet.

[Biniman Idugboe]

I have JDK 13 and JDK 14 in my computer.  So, now I have tried to create another Java program based on Maven with JDK 13.  The program still would not compile.

package com.mycompany.mavenproject4;
public class NewClass {
    public static void main(String[] args){
        System.out.println("Just say hello world!");
    }    
}

Scanning for projects...
                                                                       
------------------------------------------------------------------------
Building mavenproject4 1.0-SNAPSHOT
------------------------------------------------------------------------
Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-surefire-plugin/2.12.4/maven-surefire-plugin-2.12.4.pom

------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Total time: 0.778 s
Finished at: 2020-04-21T14:47:32+01:00
Final Memory: 7M/30M
------------------------------------------------------------------------
Plugin org.apache.maven.plugins:maven-surefire-plugin:2.12.4 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-surefire-plugin:jar:2.12.4: Could not transfer artifact org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4 from/to central (https://repo.maven.apache.org/maven2): No such host is known (repo.maven.apache.org) -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>com.mycompany</groupId>    <artifactId>mavenproject4</artifactId>    <version>1.0-SNAPSHOT</version>    <packaging>jar</packaging>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <maven.compiler.source>13</maven.compiler.source>        <maven.compiler.target>13</maven.compiler.target>    </properties> </project>

<?xml version="1.0" encoding="UTF-8"?> <project-shared-configuration>    <!-- This file contains additional configuration written by modules in the NetBeans IDE. The configuration is intended to be shared among all the users of project and therefore it is assumed to be part of version control checkout. Without this configuration present, some functionality in the IDE may be limited or fail altogether. -->    <properties xmlns="http://www.netbeans.org/ns/maven-properties-data/1">        <!-- Properties that influence various parts of the IDE, especially code formatting and the like. You can copy and paste the single properties, into the pom.xml file and the IDE will pick them up. That way multiple projects can share the same settings (useful for formatting rules for example). Any value defined here will override the pom.xml file value but is only applicable to the current project. -->        <org-netbeans-modules-javascript2-requirejs.enabled>true</org-netbeans-modules-javascript2-requirejs.enabled>    </properties> </project-shared-configuration>

[Stephan van Hulst]

From a command line, can you ping repo.maven.apache.org?

[Biniman Idugboe]

Yes, see below.

[Stephan van Hulst]

Try to download the latest version of Maven and configure NetBeans to use that instead of the bundled version.

[Biniman Idugboe]

The next challenge is how to get NetBeans the downloaded Maven.  The error I have now is "The system cannot find the path specified".

Please see the image below and guide me as to how to set Maven Home.

[Stephan van Hulst]

You need to put the folder that's inside the unpacked archive (apache-maven-3.6.3, NOT apache-maven-3.6.3-bin) in some sensible location on your PC and add that in NetBeans.

For instance, I renamed the apache-maven-3.6.3 folder to C:\Program Files\Apache\Maven 3.6.3, and added that path to NetBeans.

You may also want to create an environment variable named M2_HOME with the value being the path of the Maven installation directory. Create another variable M2 that has the value %M2_HOME%\bin. Finally, prepend %M2%; to the PATH environement variable.

When you've done all that, run mvn -v from a command line interface to see if it works.

[Biniman Idugboe]

Thank you Stephan.  For the first time, I was able to compile and run a Java program on Maven.  See my big greetings to the world, below.

[Biniman Idugboe]

The outcome of running mvn -v is shown below.

[Knute Snortum]

Success!  That's great!

[Biniman Idugboe]

Sincere apology for reopening this thread.  My original challenge of not being able to run a Java modular project based on Ant remains unsolved.  
For whatever reason, I am not able to run the project from NetBeans IDE.  However, I can run it at the command line.  The Java modular project
(not NetBeans module project) was coded and compiled in NetBeans IDE.  I will really be happy to know what is happening.

The command line that I am using to run the Java modular project is as follows:
C:\Program Files\openjdk-14_windows-x64_bin\jdk-14\bin>java --module-path D:\***\ModularProjectOne\build\modules -m com.testing.one/com.testing.one.User

[Biniman Idugboe]

Just to add that the command line command that I am using to run the project was actually suggested by the NetBeans IDE at the end of the Build process. It is kind of strange that NetBeans knows the correct command line command that should be used, but does not know the correct things to do to run the program from its own environment.

[Stephan van Hulst]

Have you tried deleting the projects and creating them again?

[Biniman Idugboe]

No, I have not deleted the project and recreated it.  But I have created a new Java modular project. Still, I cannot run it from NetBeans IDE. As usual, I can run it from the command line.

[Stephan van Hulst]

In your NetBeans installation folder, can you set netbeans_jdkhome in etc/netbeans.conf to the installation folder of JDK 13? Restart NetBeans. Tell us what happens.

If it doesn't work, you need to take it up with Apache, I'm afraid.

[Biniman Idugboe]

Here's the change that I have just made to the netbeans.conf file.  
netbeans_jdkhome=C:\Program Files\OpenJDK14_And_OpenJFX14\openjdk-14_windows-x64_bin\jdk-14
The program still does not run in NetBeans IDE.

[Stephan van Hulst]

Well, the point was to change it to JDK 13, not JDK 14.

[Biniman Idugboe]

netbeans_jdkhome=C:\Program Files\Java\jdk-13.0.1
I have created a new Java modular project based on JDK13.0.1.  I can run the project from the command line, but it does not run in Netabens IDE. When I click the Run button, nothing happens.

C:\Program Files\Java\jdk-13.0.1\bin>java --module-path D:\Joe\JavaStuff\ProjectsWithNetBeans\JavaModularApplication2\build\modules -m newmodule/newpackage2.NewClass2
Output:  Say Hello World!

[Stephan van Hulst]

And the problem does not occur with a non-modular project?

When you say 'nothing happens', do you mean that NetBeans doesn't respond at all, or that you get a popup asking you to select a main class?

[Biniman Idugboe]

Apology for rather late response.  I can run non-Java modular projects in NetBeans IDE.

When I say nothing happens, I mean nothing happens. I click the Run button and NetBeans does not respond at all.

[Stephan van Hulst]

Don't know what you tell you other than that it appears like a corrupt NetBeans installation or configuration.

[Biniman Idugboe]

I was using NetBean 11.1 before now.  It was because of this inability to run Java modular project in Netbeans IDE that I downloaded NetBeans 11.3.  So, it fair to say that the problem is not due to corrupted installation. I do believe the challenges I am facing has a lot to do with configuration.  Yes!  But who can recommend the best way to configure NetBeans to run a Java modular project?  NetBeans compiles the projects without errors. It must be an appropriate runtime configuration that is missing. Who can help me with this?

[Biniman Idugboe]

I think I am missing the right way to configure the VM options.

[Biniman Idugboe]

The modulepath in the following image.  What is the correct way to configure it?