//SOURCES doesn't works on remote GitHub

[bsorrentino]

I have a Java file TestApp.java that declare the follow SOURCES

//SOURCES org/bsc/langgraph4j/spring/ai/agentexecutor/AiModel.java
//SOURCES org/bsc/langgraph4j/spring/ai/agentexecutor/TestTools.java
//SOURCES org/bsc/langgraph4j/spring/ai/agentexecutor/gemini/TestTools4Gemini.java

The directory tree is :

src/main/java/
├──  TestApp.Java
├──  org/bsc/langgraph4j/spring/ai/agentexecutor/AiModel.java                
├──  org/bsc/langgraph4j/spring/ai/agentexecutor/TestTools.java      
├──  org/bsc/langgraph4j/spring/ai/agentexecutor/gemini/TestTools4Gemini.java      

This work fine on the local file system but when run JBang with the URL https://github.com/user/project/blob/develop/spring-ai/spring-ai-agent/src/test/java/TestApp.Java the follow error occurred:

dev.jbang.cli.ExitException: Could not find: org/bsc/langgraph4j/spring/ai/agentexecutor/AiModel.java

What is the problem here ?

[quintesse]

What is the problem here ?

No idea, this should definitely work. It would be nice if there was an actual example to test with!

[bsorrentino]

Hi @quintesse thanks for quick response

You can test yourself, I've installed JBang and the app javelit (jbang app install javelit@javelit) after that you can run :

javelit run https://github.com/langgraph4j/langgraph4j/blob/main/spring-ai/spring-ai-agent/src/test/java/JtAgentExecutorApp.java

I got the following exception. I guess that is JBang involved and Javelit is just a trigger

10:15:57.713 [main] INFO io.javelit.cli.Cli -- Detected remote file URL: https://github.com/langgraph4j/langgraph4j/blob/main/spring-ai/spring-ai-agent/src/test/java/JtAgentExecutorApp.java
10:15:57.736 [main] INFO io.javelit.cli.RemoteFileUtils -- Downloading https://raw.githubusercontent.com/langgraph4j/langgraph4j/main/spring-ai/spring-ai-agent/src/test/java/JtAgentExecutorApp.java to /var/folders/np/f8k4dmcx58s0bv9trqzyxt9h0000gn/T/javelit-remote-10492443453449073826/JtAgentExecutorApp.java
10:15:58.246 [main] INFO io.javelit.cli.RemoteFileUtils -- Successfully downloaded file to /var/folders/np/f8k4dmcx58s0bv9trqzyxt9h0000gn/T/javelit-remote-10492443453449073826/JtAgentExecutorApp.java
10:15:58.246 [main] INFO io.javelit.cli.Cli -- Starting Javelit on file /var/folders/np/f8k4dmcx58s0bv9trqzyxt9h0000gn/T/javelit-remote-10492443453449073826/JtAgentExecutorApp.java
10:15:58.304 [Thread-0] INFO io.javelit.core.AppRunner -- Compiling the app for the first time.
10:15:58.304 [Thread-0] INFO io.javelit.core.FileReloader -- Trying to add FATJAR_AND_JBANG dependencies to the classpath...
10:15:58.341 [main] INFO io.undertow -- starting server: Undertow - 2.3.20.Final
10:15:58.345 [main] INFO org.xnio -- XNIO version 3.8.16.Final
10:15:58.350 [main] INFO org.xnio.nio -- XNIO NIO Implementation Version 3.8.16.Final
10:15:58.538 [main] INFO io.javelit.core.Server$FileWatcher -- Initializing file watch in parent directory: /var/folders/np/f8k4dmcx58s0bv9trqzyxt9h0000gn/T/javelit-remote-10492443453449073826
10:15:58.541 [Thread-0] WARN io.javelit.core.AppRunner -- First compilation failed. Will re-attempt compilation when user connects and return the error to the user.
io.javelit.core.CompilationException: Failed to resolve FATJAR_AND_JBANG dependencies: Could not find: org/bsc/langgraph4j/spring/ai/agentexecutor/AiModel.java
	at io.javelit.core.FileReloader.buildClasspath(FileReloader.java:374)
	at io.javelit.core.FileReloader.reload(FileReloader.java:86)
	at io.javelit.core.AppRunner.reload(AppRunner.java:79)
	at io.javelit.core.AppRunner.lambda$new$0(AppRunner.java:65)
	at java.base/java.lang.Thread.run(Thread.java:1570)
Caused by: dev.jbang.cli.ExitException: Could not find: org/bsc/langgraph4j/spring/ai/agentexecutor/AiModel.java
	at dev.jbang.source.Source.forResource(Source.java:132)
	at dev.jbang.source.TagReader.lambda$collectSources$13(TagReader.java:309)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:212)
	at java.base/java.util.Collections$2.tryAdvance(Collections.java:5074)
	at java.base/java.util.Collections$2.forEachRemaining(Collections.java:5082)
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:782)
	at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:291)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:212)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:212)
	at java.base/java.util.stream.SliceOps$1$1.accept(SliceOps.java:200)
	at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:1024)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:556)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:546)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:611)
	at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:291)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:194)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:212)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:194)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1939)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:556)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:546)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:702)
	at dev.jbang.source.TagReader.collectSources(TagReader.java:310)
	at dev.jbang.source.ProjectBuilder.updateProject(ProjectBuilder.java:605)
	at dev.jbang.source.ProjectBuilder.updateProjectMain(ProjectBuilder.java:555)
	at dev.jbang.source.ProjectBuilder.createSourceProject(ProjectBuilder.java:386)
	at dev.jbang.source.ProjectBuilder.build(ProjectBuilder.java:313)
	at dev.jbang.source.ProjectBuilder.build(ProjectBuilder.java:297)
	at io.javelit.core.BuildSystem$1.obtainClasspath(BuildSystem.java:97)
	at io.javelit.core.FileReloader.buildClasspath(FileReloader.java:361)
	... 4 common frames omitted
10:15:58.850 [main] INFO io.javelit.core.Server$FileWatcher -- File watch started successfully
10:15:58.850 [main] INFO io.javelit.core.Server -- Javelit server started on http://localhost:8080
10:15:58.850 [main] INFO io.javelit.cli.Cli -- Press Ctrl+C to stop
10:16:00.084 [XNIO-1 I/O-9] WARN io.javelit.core.AppRunner -- Pre-compilation of the app failed the first time. Attempting first compilation again.
10:16:00.085 [XNIO-1 I/O-9] INFO io.javelit.core.FileReloader -- Trying to add FATJAR_AND_JBANG dependencies to the classpath...

[quintesse]

Hi @bsorrentino , thanks for the additional info. But looking at the log I think that the issue is with javelit. Look at these lines:

10:15:57.713 [main] INFO io.javelit.cli.Cli -- Detected remote file URL: https://github.com/langgraph4j/langgraph4j/blob/main/spring-ai/spring-ai-agent/src/test/java/JtAgentExecutorApp.java
10:15:57.736 [main] INFO io.javelit.cli.RemoteFileUtils -- Downloading https://raw.githubusercontent.com/langgraph4j/langgraph4j/main/spring-ai/spring-ai-agent/src/test/java/JtAgentExecutorApp.java to /var/folders/np/f8k4dmcx58s0bv9trqzyxt9h0000gn/T/javelit-remote-10492443453449073826/JtAgentExecutorApp.java
10:15:58.246 [main] INFO io.javelit.cli.RemoteFileUtils -- Successfully downloaded file to /var/folders/np/f8k4dmcx58s0bv9trqzyxt9h0000gn/T/javelit-remote-10492443453449073826/JtAgentExecutorApp.java
10:15:58.246 [main] INFO io.javelit.cli.Cli -- Starting Javelit on file /var/folders/np/f8k4dmcx58s0bv9trqzyxt9h0000gn/T/javelit-remote-10492443453449073826/JtAgentExecutorApp.java

It clearly shows that javelit is the one that downloads the .java file to the local file system. At which point I assume it runs jbang on it. But by then the information that the file originally came from github has been lost. So when jbang encounters the //SOURCES lines it can only look on the local filesystem where it can't find them.

So javelit should either:

• learn how to download all the other files to the local filesystem (it can ask for that using jbang info tools <URL>)
• edit the .java file and patch any //SOURCES and //FILES lines to include the original URL
• run jbang directly on the URL instead of downloading it first

The other option is that you edit the original .java file and make all the //SOURCES lines use absolute URLs. Of course then it won't work locally on your filesystem anymore, so that's not a solution I would recommend.

(An aside for @maxandersen , this to me seems a situation where a --root///ROOT option like we discussed some time ago would be useful.)

[quintesse]

Looking at it a bit more I see that javelit actually uses internal JBang code to do its work, and I've confirmed it's definitely an issue on their side. I would suggest opening an issue for this on their issue tracker. When you do so put a link to it here and I'll add my ideas to it as well.

[bsorrentino]

Thanks @quintesse for support. My analysis started with wrong assumptions

[cyrilou242]

Hey @quintesse, I am the maintainer of Javelit, thanks for looking into this and sorry for the noise.

Javelit (when run as a CLI launcher) is indeed not using jbang as a launcher, it just re-uses the code that parses //DEPS statements, to provide a jbang-like interface. Other statements may be supported in the future.
There is an open ticket for this (javelit/javelit#42).
For //sources: it will not be supported, as files in the same folder and in sub-folder are found by the java compiler automatically.

The issue was that when running:

javelit run https://github.com/langgraph4j/langgraph4j/blob/main/spring-ai/spring-ai-agent/src/test/java/JtAgentExecutorApp.java

it runs from a distant github file, and only the JtAgentExecutorApp.java file is downloaded

To run from a github folder, the command needs to point to the folder:

javelit run https://github.com/langgraph4j/langgraph4j/tree/main/spring-ai/spring-ai-agent/src/test/java

See doc:
https://docs.javelit.io/develop/concepts/architecture/run-your-app#pass-a-url-to-javelit-run

In general I think that if someone complains about jbang for Javelit, you can just tell them to complain to Javelit first :)

[maxandersen]

Yeah this is what I mentioned on the javelit issue. If kavaler called jbang this would (in theory) just work.

I get it's felt like calling external process is too heavy but you can just call jbang main and get quite far imo :) and if doesn't work - let's fix or provide way to do it :)