I am trying to develop an AI Agent using LangChain4J Quarkus plugin, in Kotlin.
I have created this class:
package prova.langchainkotlin.test
import io.quarkiverse.langchain4j.RegisterAiService
import jakarta.enterprise.context.SessionScoped
@SessionScoped
@RegisterAiService(modelName = "test-agent")
interface TestAgent {
}
But I keep on getting this compile errors:
Managed bean must be a concrete class or @Decorator
Managed bean declaring a passivating scope must be java.io.Serializable
It seems to be a general problem of Kotlin interfaces with SessionScoped. However, I am following the Java version of "Step 01 - Introduction to Quarkus LangChain4j"
https://quarkus.io/quarkus-workshop-langchain4j/step-01/#chatting-with-the-chatbot
In which the service is declared as a Java Interface.
I tried to remove the "@SessionScoped" to make it compile, and it does, but in this way the Agent does not work as expected since it seems to lose the conversation context (And this is somehow expected, because the article tells that the "@SessionScoped" annotation is used exactly to keep track of the conversation context / memory)
Below you can find the pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.acme</groupId>
<artifactId>langchain_kotlin</artifactId>
<version>1.0.0-SNAPSHOT</version>
<properties>
<compiler-plugin.version>3.14.0</compiler-plugin.version>
<kotlin.version>2.1.21</kotlin.version>
<maven.compiler.release>21</maven.compiler.release>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<quarkus.platform.artifact-id>quarkus-bom</quarkus.platform.artifact-id>
<quarkus.platform.group-id>io.quarkus.platform</quarkus.platform.group-id>
<quarkus.platform.version>3.23.0</quarkus.platform.version>
<quarkus.langchain4j.version>0.27.0.CR2</quarkus.langchain4j.version>
<skipITs>true</skipITs>
<surefire-plugin.version>3.5.2</surefire-plugin.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>${quarkus.platform.group-id}</groupId>
<artifactId>${quarkus.platform.artifact-id}</artifactId>
<version>${quarkus.platform.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-qute</artifactId>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-rest-jackson</artifactId>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-rest-client-jackson</artifactId>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-kotlin</artifactId>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-arc</artifactId>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-websockets-next</artifactId>
</dependency>
<dependency>
<groupId>io.quarkus</groupId>
<artifactId>quarkus-junit5</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jdk8</artifactId>
</dependency>
<dependency>
<groupId>io.rest-assured</groupId>
<artifactId>kotlin-extensions</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.quarkiverse.langchain4j</groupId>
<artifactId>quarkus-langchain4j-ollama</artifactId>
<version>${quarkus.langchain4j.version}</version>
</dependency>
<dependency>
<groupId>io.quarkiverse.langchain4j</groupId>
<artifactId>quarkus-langchain4j-testing-scorer-junit5</artifactId>
<version>${quarkus.langchain4j.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/kotlin</sourceDirectory>
<testSourceDirectory>src/test/kotlin</testSourceDirectory>
<plugins>
<plugin>
<groupId>${quarkus.platform.group-id}</groupId>
<artifactId>quarkus-maven-plugin</artifactId>
<version>${quarkus.platform.version}</version>
<extensions>true</extensions>
<executions>
<execution>
<goals>
<goal>build</goal>
<goal>generate-code</goal>
<goal>generate-code-tests</goal>
<goal>native-image-agent</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>${compiler-plugin.version}</version>
<configuration>
<parameters>true</parameters>
</configuration>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire-plugin.version}</version>
<configuration>
<systemPropertyVariables>
<java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
<maven.home>${maven.home}</maven.home>
</systemPropertyVariables>
</configuration>
</plugin>
<plugin>
<artifactId>maven-failsafe-plugin</artifactId>
<version>${surefire-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>integration-test</goal>
<goal>verify</goal>
</goals>
</execution>
</executions>
<configuration>
<systemPropertyVariables>
<native.image.path>${project.build.directory}/${project.build.finalName}-runner</native.image.path>
<java.util.logging.manager>org.jboss.logmanager.LogManager</java.util.logging.manager>
<maven.home>${maven.home}</maven.home>
</systemPropertyVariables>
</configuration>
</plugin>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>${kotlin.version}</version>
<executions>
<execution>
<id>compile</id>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>test-compile</id>
<goals>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-allopen</artifactId>
<version>${kotlin.version}</version>
</dependency>
</dependencies>
<configuration>
<javaParameters>true</javaParameters>
<jvmTarget>21</jvmTarget>
<compilerPlugins>
<plugin>all-open</plugin>
</compilerPlugins>
<pluginOptions>
<option>all-open:annotation=jakarta.ws.rs.Path</option>
<option>all-open:annotation=jakarta.enterprise.context.ApplicationScoped</option>
<option>all-open:annotation=jakarta.persistence.Entity</option>
<option>all-open:annotation=io.quarkus.test.junit.QuarkusTest</option>
</pluginOptions>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>native</id>
<activation>
<property>
<name>native</name>
</property>
</activation>
<properties>
<skipITs>false</skipITs>
<quarkus.native.enabled>true</quarkus.native.enabled>
</properties>
</profile>
</profiles>
</project>
I solved the problem by moving the @SessionScoped annotation to the method I was implementing.
That annotation is not usable in the context of the whole interface.