polyglot-chat-app not able to run

./gradlew run   

> Task :run
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| |\/| | |/ __| '__/ _ \| '_ \ / _` | | | | __|
| |  | | | (__| | | (_) | | | | (_| | |_| | |_ 
|_|  |_|_|\___|_|  \___/|_| |_|\__,_|\__,_|\__|
09:33:19.221 [main] INFO  io.micronaut.runtime.Micronaut - Startup completed in 3021ms. Server Running: http://localhost:12345
[To redirect Truffle log output to a file use one of the following options:
* '--log.file=<path>' if the option is passed using a guest language launcher.
* '-Dpolyglot.log.file=<path>' if the option is passed using the host Java launcher.
* Configure logging using the polyglot embedding API.]
[engine] WARNING: The polyglot engine uses a fallback runtime that does not support runtime compilation to native code.
Execution without runtime compilation will negatively impact the guest application performance.
The following cause was found: JVMCI is not enabled for this JVM. Enable JVMCI using -XX:+EnableJVMCI.
For more information see: https://www.graalvm.org/latest/reference-manual/embed-languages/.
To disable this warning use the '--engine.WarnInterpreterOnly=false' option or the '-Dpolyglot.engine.WarnInterpreterOnly=false' system property.
09:33:55.491 [default-nioEventLoopGroup-1-5] INFO  websocket.chat.ChatWebSocket - * WebSocket: onOpen received for session f5DFQCHfnGbAFCzVthJEWQ== from 'bob' regarding 'chat'
09:34:09.597 [default-nioEventLoopGroup-1-5] INFO  websocket.chat.ChatWebSocket - * WebSocket: onMessage received for session f5DFQCHfnGbAFCzVthJEWQ== from 'bob' regarding 'chat'
Exception in thread "Thread-3" LookupError: 
**********************************************************************
  Resource vader_lexicon not found.
  Please use the NLTK Downloader to obtain the resource:

  >>> import nltk
  >>> nltk.download('vader_lexicon')
  
  For more information see: https://www.nltk.org/data.html

  Attempted to load sentiment/vader_lexicon.zip/vader_lexicon/vader_lexicon.txt

  Searched in:
    - '/Users/bhoran/nltk_data'
    - '/Users/bhoran/Oracle/GraalVM/graalvm-demos/polyglot-chat-app/build/resources/main/venv/nltk_data'
    - '/Users/bhoran/Oracle/GraalVM/graalvm-demos/polyglot-chat-app/build/resources/main/venv/share/nltk_data'
    - '/Users/bhoran/Oracle/GraalVM/graalvm-demos/polyglot-chat-app/build/resources/main/venv/lib/nltk_data'
    - '/usr/share/nltk_data'
    - '/usr/local/share/nltk_data'
    - '/usr/lib/nltk_data'
    - '/usr/local/lib/nltk_data'
    - ''
**********************************************************************

        at <python> find(build/resources/main/venv/lib/python3.10/site-packages/nltk/data.py:471-583:16484-21267)
        at <python> _open(Unknown)
        at <python> load(Unknown)
        at <python> __init__(Unknown)
        at <python> <module>(Unknown)
        at org.graalvm.polyglot.Context.eval(Context.java:402)
        at websocket.chat.PolyglotContextFactories.loadScript(PolyglotContextFactories.java:101)
        at websocket.chat.PolyglotContextFactories.lambda$createContext$0(PolyglotContextFactories.java:95)
        at java.base/java.lang.Thread.run(Thread.java:1583)
<==========---> 80% EXECUTING [2m 26s]
> :run

[olyagpl]

@BHoran , what JDK did you run this demo with? I'm testing on Oracle GraalVM 21+35.1, macOS, and the exception is different:

16:50:15.726 [main] INFO  io.micronaut.runtime.Micronaut - Startup completed in 429ms. Server Running: http://localhost:12345
Exception in thread "Thread-8" ModuleNotFoundError: No module named 'nltk'
        at <python> <module>(Unknown)
        at org.graalvm.polyglot.Context.eval(Context.java:402)
        at websocket.chat.PolyglotContextFactories.loadScript(PolyglotContextFactories.java:101)
        at websocket.chat.PolyglotContextFactories.lambda$createContext$0(PolyglotContextFactories.java:95)
        at java.base/java.lang.Thread.run(Thread.java:1583)
16:50:56.592 [default-nioEventLoopGroup-1-5] INFO  websocket.chat.ChatWebSocket - * WebSocket: onOpen received for session IQ2DUaHAZFXMNrXbtsK1xw== from 'bob' regarding 'chat'

Same root cause by the looks of it.

I was using OpenJDK

openjdk version "21.0.2" 2024-01-16
OpenJDK Runtime Environment (build 21.0.2+13-58)
OpenJDK 64-Bit Server VM (build 21.0.2+13-58, mixed mode, sharing)

[olyagpl]

In my test round, on Oracle GraalVM 21+35.1 for macOS, I could run on JVM and as a native image.
@timfel , could you please see this exception and warnings in the console during the runs? Anything we can do to eliminate those?

ogupalo@ogupalo-mac polyglot-chat-app % ./gradlew nativeCompile

> Task :nativeCompile
[native-image-plugin] GraalVM Toolchain detection is disabled
[native-image-plugin] GraalVM location read from environment variable: JAVA_HOME
[native-image-plugin] Native Image executable path: /Library/Java/JavaVirtualMachines/graalvm-jdk-21+35.1/Contents/Home/lib/svm/bin/native-image
Warning: Using a deprecated option --rerun-class-initialization-at-runtime= from 'META-INF/native-image/org.graalvm.shadowed.icu4j/native-image.properties' in 'file:///Users/ogupalo/.gradle/caches/modules-2/files-2.1/org.graalvm.shadowed/icu4j/23.1.1/42b9cb08bb875f018a836c679100cf2cc944e941/icu4j-23.1.1.jar'. Currently there is no replacement for this option. Try using --initialize-at-run-time or use the non-API option -H:ClassInitialization directly.
Warning: Invalid option --add-exports org.graalvm.nativeimage/org.graalvm.nativeimage.impl=org.graalvm.py provided by 'META-INF/native-image/org.graalvm.py/native-image.properties' in 'file:///Users/ogupalo/.gradle/caches/modules-2/files-2.1/org.graalvm.python/python-language/23.1.1/2b91a6368e8fe71ad6edeeaf46bb2a9abb0e5ea1/python-language-23.1.1.jar'. Specified target-module 'org.graalvm.py' is unknown.
...
BUILD SUCCESSFUL in 11m 24s
5 actionable tasks: 1 executed, 4 up-to-date
ogupalo@ogupalo-mac polyglot-chat-app % build/native/nativeCompile/websocket.chat
 __  __ _                                  _   
|  \/  (_) ___ _ __ ___  _ __   __ _ _   _| |_ 
| |\/| | |/ __| '__/ _ \| '_ \ / _` | | | | __|
| |  | | | (__| | | (_) | | | | (_| | |_| | |_ 
|_|  |_|_|\___|_|  \___/|_| |_|\__,_|\__,_|\__|
17:08:51.185 [main] INFO  io.micronaut.runtime.Micronaut - Startup completed in 35ms. Server Running: http://localhost:12345
17:08:57.633 [default-nioEventLoopGroup-1-4] INFO  websocket.chat.ChatWebSocket - * WebSocket: onOpen received for session kGly9q3e0xB5Xci4ifi/8A== from 'bob' regarding 'chat'
Exception in thread "Thread-10" ModuleNotFoundError: No module named 'nltk'
	at <python> <module>(Unknown)
	at org.graalvm.polyglot/org.graalvm.polyglot.Context.eval(Context.java:402)
	at websocket.chat.PolyglotContextFactories.loadScript(PolyglotContextFactories.java:101)
	at websocket.chat.PolyglotContextFactories.lambda$createContext$0(PolyglotContextFactories.java:95)
	at java.base@21/java.lang.Thread.runWith(Thread.java:1596)
	at java.base@21/java.lang.Thread.run(Thread.java:1583)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.thread.PlatformThreads.threadStartRoutine(PlatformThreads.java:833)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.posix.thread.PosixPlatformThreads.pthreadStartRoutine(PosixPlatformThreads.java:211)
17:09:00.920 [default-nioEventLoopGroup-1-4] INFO  websocket.chat.ChatWebSocket - * WebSocket: onMessage received for session kGly9q3e0xB5Xci4ifi/8A== from 'bob' regarding 'chat'

Another observation, step 2 "Copy the venv into the output resources directory" seems redundant. A native image runs the same way.

[timfel]

@BHoran seems like the README is just missing the step that it tells you in the output:

 Resource vader_lexicon not found.
 Please use the NLTK Downloader to obtain the resource:
 >>> import nltk
 >>> nltk.download('vader_lexicon')

Please try to do this and then run again. So basically

graalpy-23.1.1-linux-amd64/bin/graalpy -m venv src/main/resources/venv
src/main/resources/venv/bin/graalpy -m pip install nltk

needs to become

graalpy-23.1.1-linux-amd64/bin/graalpy -m venv src/main/resources/venv
src/main/resources/venv/bin/graalpy -m pip install nltk
src/main/resources/venv/bin/graalpy -c "import nltk; nltk.download('vader_lexicon')"

@olyagpl
You have not installed nltk at all it seems, or you didn't do the

Copy the venv into the output resources directory:

step. That step is required, the gradle build will not put it in the right place for you, and then the native image cannot load the required packages.

[timfel]

To summarise, just because the Micronaut app starts doesn't mean all the steps worked. I guess I need to add more checks to give more and better error messages.

[olyagpl]

@timfel,
Importing the nltk module with a separate command, src/main/resources/venv/bin/graalpy -c "import nltk; nltk.download('vader_lexicon')" fixed the problem running on a JVM, but native-image run fails with the same:

Produced artifacts:
 /Users/ogupalo/graal-development/graalvm-demos/polyglot-chat-app/build/native/nativeCompile/resources (language_internal_resources)
 /Users/ogupalo/graal-development/graalvm-demos/polyglot-chat-app/build/native/nativeCompile/websocket.chat (executable)
============================================================================================
Finished generating 'websocket.chat' in 11m 23s.
[native-image-plugin] Native Image written to: /Users/ogupalo/graal-development/graalvm-demos/polyglot-chat-app/build/native/nativeCompile

BUILD SUCCESSFUL in 11m 35s
5 actionable tasks: 3 executed, 2 up-to-date
ogupalo@ogupalo-mac polyglot-chat-app % cp -R src/main/resources/venv/ build/native/nativeCompile/resources/python/
ogupalo@ogupalo-mac polyglot-chat-app % build/native/nativeCompile/websocket.chat                                           
 __  __ _                                  _   
|  \/  (_) ___ _ __ ___  _ __   __ _ _   _| |_ 
| |\/| | |/ __| '__/ _ \| '_ \ / _` | | | | __|
| |  | | | (__| | | (_) | | | | (_| | |_| | |_ 
|_|  |_|_|\___|_|  \___/|_| |_|\__,_|\__,_|\__|
12:20:51.554 [main] INFO  io.micronaut.runtime.Micronaut - Startup completed in 37ms. Server Running: http://localhost:12345
12:20:54.316 [default-nioEventLoopGroup-1-4] INFO  websocket.chat.ChatWebSocket - * WebSocket: onOpen received for session MJxrOTzjAtY6I7lb36NAcQ== from 'bob' regarding 'chat'
Exception in thread "Thread-10" ModuleNotFoundError: No module named 'nltk'
	at <python> <module>(Unknown)
	at org.graalvm.polyglot/org.graalvm.polyglot.Context.eval(Context.java:402)
	at websocket.chat.PolyglotContextFactories.loadScript(PolyglotContextFactories.java:101)
	at websocket.chat.PolyglotContextFactories.lambda$createContext$0(PolyglotContextFactories.java:95)
	at java.base@21/java.lang.Thread.runWith(Thread.java:1596)
	at java.base@21/java.lang.Thread.run(Thread.java:1583)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.thread.PlatformThreads.threadStartRoutine(PlatformThreads.java:833)
ng.Thread.run(Thread.java:1583)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.thread.PlatformThreads.threadStartRoutine(PlatformThreads.java:833)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.posix.thread.PosixPlatformThreads.pthreadStartRoutine(PosixPlatformThreads.java:211)
12:21:42.677 [default-nioEventLoopGroup-1-4] INFO  websocket.chat.ChatWebSocket - * WebSocket: onMessage received for session wgH1TfIlNyA9snuWEhK5cQ== from 'bob' regarding 'chat'

[olyagpl]

I've updated the example README.md in https://github.com/graalvm/graalvm-demos/pull/258/files#diff-bb620106d27f119fde8a27fd423fff11cfa0636260ca891f70af44ae1b6a4dddR21.

Did you
"Copy the venv into the output resources directory"?

[olyagpl]

Yes, I can see the resources copied and the nltk module:

@BHoran , can you try from your end?

[timfel]

@olyagpl that isn't correctly copied. You should have
nativeCompile/resources/python/venv/bin/ and nativeCompile/resources/python/venv/include/ and nativeCompile/resources/python/venv/lib

[timfel]

I suppose my README was a bit terse

2. Copy the venv into the output _resources_ directory:
   cp -R src/main/resources/venv/ build/native/nativeCompile/resources/python/

By this I meant that you want the venv directory to end up inside build/native/nativeCompile/resources/python/

[timfel]

Something else seems to be weird with your build @olyagpl - there should already be a build/native/nativeCompile/resources/python/ directory anyway, which the native image build puts there automatically.