How to jlink when my own module is not found?

Question

I have a directory structure like this:

TestJlink

-src

--module-info.java

--com

---company

----TestJLink

-----TestJLink.java

I run this jlink --module-path src --add-modules com.company.TestJLink --output outputJRE

I get Error: Module com.company.TestJlink not found

The contents of my module-info.java is this:

module com.company.TestJlink {         
  requires java.desktop;     
  requires com.microsoft.sqlserver.jdbc;         
  requires java.sql;         
  requires sshj;     
}

My TestJLink.java contains this

package com.company.TestJLink;
imports ...
public class TestJLink {
    TestJlink(){}
...
}

I am using java 11

I am able to build it using this: java -p C:\Users\Administrator...\target\classes;C:\Users\Administrator.m2\repository\com\microsoft\sqlserver\mssql-jdbc\8.4.1.jre11\mssql-jdbc-8.4.1.jre11.jar;C:\Users\Administrator.m2\repository\com\hierynomus\sshj\0.27.0\sshj-0.27.0.jar;C:\Users\Administrator.m2\repository\org\bouncycastle\bcprov-jdk15on\1.60\bcprov-jdk15on-1.60.jar;C:\Users\Administrator.m2\repository\org\bouncycastle\bcpkix-jdk15on\1.60\bcpkix-jdk15on-1.60.jar;C:\Users\Administrator.m2\repository\com\jcraft\jzlib\1.1.3\jzlib-1.1.3.jar;C:\Users\Administrator.m2\repository\net\i2p\crypto\eddsa\0.2.0\eddsa-0.2.0.jar;C:\Users\Administrator.m2\repository\org\slf4j\slf4j-api\1.7.5\slf4j-api-1.7.5.jar;C:\Users\Administrator.m2\repository\org\slf4j\slf4j-log4j12\1.7.5\slf4j-log4j12-1.7.5.jar;C:\Users\Administrator.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar -m com.company.TestJLink/com.company.TestJLink.TestJLink

..by making sure your module has been produced as an output on the path you've specified. that would obviously be a pre-requisite of executing the `jlink` command. so, time to visit back the tutorial or documentation guiding you to create standalone JRE. — Naman, Dec 30 '20 at 14:37
@Naman So you are saying I need an output directory? Yes I am able to build and run the TestJLlink class. It creates an output directory. Is there something else I a missing. Its just when I try to create a jre it fails. I am trying those tutorials and no luck. — coloradoman, Dec 30 '20 at 14:40
link them, let's see what are you missing, or does the tutorial need a fix itself. — Naman, Dec 30 '20 at 14:49
@Naman this is what I am using https://www.geeksforgeeks.org/jlink-java-linker/ — coloradoman, Dec 30 '20 at 14:59
and what is the value of your `--module-path` in the command you are using to link versus the one you are using to execute? — Naman, Dec 30 '20 at 15:03
Are you really using `jlink --module-path src`? Surely the JDBC and sshj modules aren’t in `src`, are they? And do you know for certain that those .jar files are modular .jar files? — VGR, Dec 31 '20 at 15:42
`-p` is the same as `--module-path`. If you use both, I suspect one replaces the other. That would explain why the jlink command ignores your `--module-path` argument, and therefore does not see the module located in `src`. Solution: add `src` to the argument given to `-p`. — VGR, Jan 04 '21 at 21:57
@VGR did you see my answer I just posted? I got it to work kinda, if you know a solution to that auto modules let me know. It think its going to be a pain in the ass to get them to include the module-info.java — coloradoman, Jan 04 '21 at 21:59

score 0 · Answer 1 · answered Jan 04 '21 at 21:57

solved it by first doing javac which I was also having problems with. The solution I found was just to add this to the end of the javac src\module-info.java src\com\company\TestJLink\TestJLink.java

After it was compiled, I was able to jlink it. The problem I had earlier with jlinking it was I was referencing the src, not the compiled .class files.

jlink --module-path --output testjre --add-modules com.company.TestJLink -p ... any other dependencies from maven jars etc.

Now I am getting this error, Error: automatic module cannot be used with jlink. This should be fun, but it has to do with my maven dependencies and not the actual example.

How to jlink when my own module is not found?

1 Answers1