Re: [PR] Agent to change retention of `@JavaScriptBody` and `@JavaScriptResource` [netbeans-html4j]

["jtulach (via GitHub)" <gi...@apache.org>]

jtulach commented on PR #54:
URL: https://github.com/apache/netbeans-html4j/pull/54#issuecomment-2992340563

   ### Testing with Native Image
   
   The primary goal of this change is to allow integration with [GraalVM](http://graalvm.org). Let's do a small test. Take [GraalVM repository](https://github.com/oracle/graal) at [release/graalvm-25.0](https://github.com/oracle/graal/tree/release/graal-vm/25.0) branch, in particular commit bb84380ba769081088ed5a95c2a4f3df9f1ac652:
   ```bash
   graal/web-image$ mx build
   graal/web-image$ graal/web-image$ mx web-image
   Error: Please specify class (or <module>/<mainclass>) containing the main entry point method. (see --help)
   ```
   With the `mx web-image` tool functioning. Let's create `netbeans-html4j-test.sh` file with the following content:
   ```bash
   #!/bin/bash
   set -e
   
   mkdir -p hi
   
   V=2.0-SNAPSHOT
   CP=$1
   
   if ! [ -e "$CP" ]; then
     echo Usage $0 '<path_to_net.java.html.boot.jar>'
     echo    - typical path may be: $HOME/.m2/repository/org/netbeans/html/net.java.html.boot/$V/net.java.html.boot-$V.jar
     exit 1
   fi
   
   
   cat >hi/Hi.java <<KONEC
   class Hi {
     @net.java.html.js.JavaScriptBody(args="txt", body="""
       console.log(txt);
       return "...returning back from JavaScript...";
     """)
     private static native String hello(String txt);
   
     public static void main(String... args) {
       System.out.println("In JVM");
       var hi = hello("Hi from JavaScript");
       System.out.println(hi);
       System.out.println("Back in JVM");
     }
   }
   KONEC
   
   javac -cp $CP hi/Hi.java -d hi
   
   mx web-image -H:+UnlockExperimentalVMOptions  -o hi  -H:Path=hi \
    -H:+SILENT_COMPILE  -H:-ClosureCompiler  -H:+DumpPreClosure \
    -H:+VerificationPhases  -H:JSRuntime=Generic  -H:Class=Hi \
    -cp hi \
    -J-javaagent:$CP
   
   node hi/hi.js
   ```
   and then just launch it with
   [net.java.html.boot-2.0-SNAPSHOT.jar.gz](https://github.com/user-attachments/files/20840550/net.java.html.boot-2.0-SNAPSHOT.jar.gz) after uncompressing it with `gzip -d`:
   ```bash
   graal/web-image$ ./netbeans-html4j-test.sh net.java.html.boot-2.0-SNAPSHOT.jar
   ======================
   GraalVM Native Image: Generating 'hi' (executable)...
   ======================
   ...
   In JVM
   Hi from JavaScript
   ...returning back from JavaScript...
   Back in JVM
   ```
   Heuréka. CCing @pziegler, @toni-epple, @fniephaus - everything seems to be working. The next version of NetBeans/HTML API will easily generate the right code with `mx web-image` tool (with the help of `-javaagent:net.java.html.boot.jar`)!


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