Dear Geertjan, Thanks again. I'd found that page, and the code I produced was a copy of the code there. It seems that a "-m" option is needed to indicate the main class. It still gives problems, but I'll try your suggestion of trying to join the openJDK mailing list.
So the Ant script output now has three bugs: No double quotes round the Java executable directory "Program Files" "-module-path" should read "--module-path" "-m" needed before the main class. Why the Java designer can't just stick to a single syntax is beyond me..... Best regards, Peter mailto:netbe...@ptoye.com www.ptoye.com ------------------------- Monday, October 21, 2019, 9:07:54 AM, you wrote: https://openjdk.java.net/projects/jigsaw/quick-start That should help, it includes the java command line syntax you're looking for. Gj On Sun, Oct 20, 2019 at 11:21 PM Geertjan Wielenga <geert...@apache.org> wrote: To be honest, I'd love to help but I'm not going to spend any time guessing about your application, you're going to need to provide a way to access it, e.g., put it on GitHub, so that it can be downloaded, e.g., sorry, "import com.ptoye.astro.World", no idea what that is, and please do not try to explain -- just take your application and put it on GitHub or somewhere else (please not as a ZIP file) and then I'll be happy to help. Indeed, yes, it would be very useful to everyone if you'd join the openjdk mailing lists and explain the problems you're having running java on the command line -- they need to know that otherwise they'll never hear from you and never make it work the way you'd like. Gj On Sun, Oct 20, 2019 at 8:10 PM Peter Toye <netbe...@ptoye.com> wrote: Dear Geertjan, OK, I've read up on modules and written my first Hello World program which compiles and runs fine using NetBeans. However, it doesn't run from a command line, even after I've removed the mistakes in the Ant-generated suggestion: D:\>"C:\Program Files\Java\jdk-12.0.1/bin/java" --module-path D:\Peter\Netbeans\TestModules1\build\modules com.ptoye.greetings.Main Picked up _JAVA_OPTIONS: -Djava.net.preferIPv4Stack=true Error: Could not find or load main class com.ptoye.greetings.Main Caused by: java.lang.ClassNotFoundException: com.ptoye.greetings.Main The main class is: package com.ptoye.greetings; ????import com.ptoye.astro.World; ??public class Main {?? public static void main(String[] args) { ?? System.out.format("Greetings %s!%n", World.name()); ?? } ??}?? Where does one go from here? I'm using the Oracle version of Java, Would OpenJDK make any difference? AFAICS it's the same. Thanks for the mailing list link. I looked at them but they all seem to be oriented towards people developing OpenJDK rather than users. There isn't a "support" or "help" link on the OpenJDK site. Best regards, Peter mailto:netbe...@ptoye.com www.ptoye.com ------------------------- Monday, October 14, 2019, 10:18:27 AM, you wrote: On Mon, Oct 14, 2019 at 11:16 AM Peter Toye <netbe...@ptoye.com> wrote: Dear Geertjan, I agree that the "java" command has nothing to do with Netbeans. I'll try to be more explicit: I have a project which dates back to about 2006 and has a main class which I'll call A. This uses a separate class B which I developed separately. I included B as a library using A's project properties. Using Netbeans 8 (and earlier) it was possible to run the project using a command line like java -jar A.jar and the program ran. The Java version was 1.8. The path to the Java executable is in my PATH. Earlier this year I wanted to develop it further, and decided to move to the latest version of NetBeans (11.1) and Java (12). Now the command line as given in the build output is C:\Program Files\Java\jdk-12.0.1/bin/java -cp directory\A.jar;directory\B.jar classpath.A My main point is that I don't understand how or why this has changed. https://openjdk.java.net/projects/jigsaw/ There is now a module system in Java, meaning that there is now a module path and a class path. That was not there in JDK 8 and is now there since then. Can you join the Java mailing lists and discuss further there: https://mail.openjdk.java.net/mailman/listinfo Gj
