Oi!

Manda aqui a stacktrace que saiu no console.

Eu baixei o projeto exatamente como está no GitHub!

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'openAIClient' defined in file [/home/wellington/Estudo Alura/Java/Java Aplicativos/3571-openai-java-2-projeto_inicial/target/classes/br/com/alura/ecomart/chatbot/infra/openai/OpenAIClient.class]: Unexpected exception during bean creation
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:536) ~[spring-beans-6.1.1.jar:6.1.1]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) ~[spring-beans-6.1.1.jar:6.1.1]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.1.jar:6.1.1]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) ~[spring-beans-6.1.1.jar:6.1.1]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-6.1.1.jar:6.1.1]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:973) ~[spring-beans-6.1.1.jar:6.1.1]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:946) ~[spring-context-6.1.1.jar:6.1.1]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:616) ~[spring-context-6.1.1.jar:6.1.1]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.2.0.jar:3.2.0]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:753) ~[spring-boot-3.2.0.jar:3.2.0]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:455) ~[spring-boot-3.2.0.jar:3.2.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:323) ~[spring-boot-3.2.0.jar:3.2.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1342) ~[spring-boot-3.2.0.jar:3.2.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1331) ~[spring-boot-3.2.0.jar:3.2.0]
    at br.com.alura.ecomart.chatbot.ChatbotApplication.main(ChatbotApplication.java:10) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) ~[spring-boot-devtools-3.2.0.jar:3.2.0]
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'OPENAI_API_KEY' in value "${OPENAI_API_KEY}"
    at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:180) ~[spring-core-6.1.1.jar:6.1.1]
    at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-6.1.1.jar:6.1.1]
    at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239) ~[spring-core-6.1.1.jar:6.1.1]
    at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-6.1.1.jar:6.1.1]
    at org.springframework.core.env.AbstractPropertyResolver.resolveNestedPlaceholders(AbstractPropertyResolver.java:230) ~[spring-core-6.1.1.jar:6.1.1]
    at org.springframework.boot.context.properties.source.ConfigurationPropertySourcesPropertyResolver.getProperty(ConfigurationPropertySourcesPropertyResolver.java:79) ~[spring-boot-3.2.0.jar:3.2.0]
    at 

Precisa configurar a variável de ambiente com a sua chave de api, conforme foi explicado no início desse vídeo: https://cursos.alura.com.br/course/gpt-java-desenvolva-chatbot-ia/task/147398

Vlw professor deu certo!