toolExecutor is null when using streaming chat with tools

[maxandersen]

getting NPE when using dev-ui chat with fileserver using attached producer and asking in chat: "what is in my project"

java.lang.NullPointerException: Cannot invoke "dev.langchain4j.service.tool.ToolExecutor.execute(dev.langchain4j.agent.tool.ToolExecutionRequest, Object)" because "toolExecutor" is null
        at io.quarkiverse.langchain4j.runtime.devui.ChatJsonRPCService$2.lambda$onComplete$0(ChatJsonRPCService.java:320)
        at io.quarkus.vertx.core.runtime.VertxCoreRecorder$15.runWith(VertxCoreRecorder.java:638)
        at org.jboss.threads.EnhancedQueueExecutor$Task.doRunWith(EnhancedQueueExecutor.java:2675)
        at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2654)
        at org.jboss.threads.EnhancedQueueExecutor.runThreadBody(EnhancedQueueExecutor.java:1627)
        at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1594)
        at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:11)
        at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:11)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:1583)

reproducer mighty.zip

I would not expect streaming would make a difference and get npe for tool executor.
Assuming there is something missing then in devui it shouldn't get stuck forever as it currently does.

[geoand]

cc @phillip-kruger @jmartisk

[jmartisk]

Can't reproduce this, I just tried with my own app as well as your zip, and in both cases it worked with streaming enabled

[jmartisk]

output.mp4