better error message when compiled without -parameters

[maxandersen]

if you (like me) forget to add -parameters to your jbang project then quarkus langchain4j shows this error:

java.lang.NullPointerException
        at java.base/java.util.Objects.requireNonNull(Objects.java:233)
        at io.quarkus.qute.TemplateInstanceBase.data(TemplateInstanceBase.java:45)
        at io.quarkiverse.langchain4j.QuarkusPromptTemplateFactory$QuteTemplate.render(QuarkusPromptTemplateFactory.java:67)
        at dev.langchain4j.model.input.PromptTemplate.apply(PromptTemplate.java:102)
        at io.quarkiverse.langchain4j.runtime.aiservice.AiServiceMethodImplementationSupport.prepareSystemMessage(AiServiceMethodImplementationSupport.java:502)
        at io.quarkiverse.langchain4j.runtime.aiservice.AiServiceMethodImplementationSupport.doImplement(AiServiceMethodImplementationSupport.java:140)
        at io.quarkiverse.langchain4j.runtime.aiservice.AiServiceMethodImplementationSupport.implement(AiServiceMethodImplementationSupport.java:122)

would be great if it would provide hint that the reason for NPE is that parameters are missing names and should add -parameter to the compilation.

[geoand]

Yeah, it makes sense to see what we can better on the Quarkus LangChain4j side, but doesn't it also make sense to have JBang invoke javac with -parameters by default?

[geoand]

Actually, we do have a warning message, it should be:

The application has been compiled without the '-parameters' being set flag on javac. Make sure your build tool is configured to pass this flag to javac, otherwise Quarkus LangChain4j is unlikely to work properly without it.

did you not get that at all?