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4.x: Langchain4j integration (helidon-io#9733)
* Lanchain4j integration * OpenAI provider * CDI integration with Service Registry * Fix for naming in proxy factory (NPE). * Fixes for qualifiers added during annotation mapping. * Removed contract from Lookup when created from Dependency that uses java.lang.Object * Added preview feature status to langchain4j * Default embedding store factory for text segments * Added support for ChatMemoryWindow annotation to simplify configuration of AI Services * Oracle embedding store support * Fixed docs of configuration of OpenAI models * Create a single bean in CDI, use provided type as its type (less beans in CDI created) * Using injection with Langchain4j OpenAi provider to avoid runtime lookups. * Added support for array types when creating TypeName from Type. * Changed name of injected proxies and tokenizers to use `.` instead of `:` between the provider name and the model type.
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Lines changed: 7219 additions & 57 deletions

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‎all/pom.xml‎

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<groupId>io.helidon.integrations.vault</groupId>
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<artifactId>helidon-integrations-vault-cdi</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.integrations.langchain4j</groupId>
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<artifactId>helidon-integrations-langchain4j</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.integrations.langchain4j</groupId>
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<artifactId>helidon-integrations-langchain4j-codegen</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.integrations.langchain4j.providers</groupId>
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<artifactId>helidon-integrations-langchain4j-providers-open-ai</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.openapi</groupId>
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<artifactId>helidon-openapi</artifactId>
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<groupId>io.helidon.metadata</groupId>
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<artifactId>helidon-metadata-hson</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.metadata</groupId>
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<artifactId>helidon-metadata-reflection</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.integrations.oci.sdk</groupId>
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<artifactId>helidon-integrations-oci-sdk-codegen</artifactId>

‎bom/pom.xml‎

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<artifactId>helidon-integrations-vault-cdi</artifactId>
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<version>${helidon.version}</version>
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</dependency>
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<dependency>
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<groupId>io.helidon.integrations.langchain4j</groupId>
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<artifactId>helidon-integrations-langchain4j</artifactId>
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<version>${helidon.version}</version>
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</dependency>
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<dependency>
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<groupId>io.helidon.integrations.langchain4j</groupId>
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<artifactId>helidon-integrations-langchain4j-codegen</artifactId>
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<version>${helidon.version}</version>
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</dependency>
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<dependency>
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<groupId>io.helidon.integrations.langchain4j.providers</groupId>
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<artifactId>helidon-integrations-langchain4j-providers-open-ai</artifactId>
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<version>${helidon.version}</version>
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</dependency>
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<!-- OpenAPI support -->
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<dependency>
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<artifactId>helidon-metadata-hson</artifactId>
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<version>${helidon.version}</version>
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</dependency>
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<dependency>
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<groupId>io.helidon.metadata</groupId>
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<artifactId>helidon-metadata-reflection</artifactId>
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<version>${helidon.version}</version>
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</dependency>
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<!-- Injection Integrations related -->
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<dependency>

‎common/types/src/main/java/io/helidon/common/types/TypeNameSupport.java‎

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/*
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* Copyright (c) 2023, 2024 Oracle and/or its affiliates.
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* Copyright (c) 2023, 2025 Oracle and/or its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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package io.helidon.common.types;
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import java.lang.reflect.GenericArrayType;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.lang.reflect.TypeVariable;
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import java.lang.reflect.WildcardType;
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import java.util.ArrayList;
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import java.util.LinkedList;
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builder.wildcard(true);
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return;
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}
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if (reflectGenericType instanceof TypeVariable<?> tv) {
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for (Type bound : tv.getBounds()) {
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builder.addUpperBound(TypeName.create(bound));
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}
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builder.className(tv.getName())
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.generic(true);
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return;
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}
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if (reflectGenericType instanceof GenericArrayType ga) {
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TypeName componentType = TypeName.create(ga.getGenericComponentType());
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builder.from(componentType)
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.array(true);
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return;
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}
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throw new IllegalArgumentException("We can only create a type from a class, GenericType, or a ParameterizedType,"
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+ " but got: " + reflectGenericType.getClass().getName());

‎dependencies/pom.xml‎

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<version.lib.junit>5.9.3</version.lib.junit>
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<version.lib.junit-platform-testkit>1.11.3</version.lib.junit-platform-testkit>
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<version.lib.kafka>3.8.1</version.lib.kafka>
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<!-- Kotlin: dependency convergence requirement, we never use this directly -->
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<version.lib.kotlin>1.9.10</version.lib.kotlin>
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<version.lib.langchain4j>0.35.0</version.lib.langchain4j>
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<version.lib.langchain4j.oracle>0.1.0</version.lib.langchain4j.oracle>
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<version.lib.log4j>2.21.1</version.lib.log4j>
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<version.lib.mariadb-java-client>2.6.2</version.lib.mariadb-java-client>
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<version.lib.maven-wagon>2.10</version.lib.maven-wagon>
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<artifactId>kafka-clients</artifactId>
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<version>${version.lib.kafka}</version>
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</dependency>
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<!-- Langchain4j integration -->
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<dependency>
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<groupId>dev.langchain4j</groupId>
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<artifactId>langchain4j-cohere</artifactId>
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<version>${version.lib.langchain4j}</version>
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</dependency>
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<dependency>
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<groupId>dev.langchain4j</groupId>
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<artifactId>langchain4j-ollama</artifactId>
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<version>${version.lib.langchain4j}</version>
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</dependency>
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<dependency>
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<groupId>dev.langchain4j</groupId>
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<artifactId>langchain4j-open-ai</artifactId>
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<version>${version.lib.langchain4j}</version>
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</dependency>
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<dependency>
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<groupId>dev.langchain4j</groupId>
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<artifactId>langchain4j-oracle</artifactId>
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<version>${version.lib.langchain4j}</version>
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</dependency>
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<dependency>
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<groupId>dev.langchain4j</groupId>
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<artifactId>langchain4j</artifactId>
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<version>${version.lib.langchain4j}</version>
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</dependency>
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<dependency>
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<groupId>dev.langchain4j</groupId>
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<artifactId>langchain4j-core</artifactId>
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<version>${version.lib.langchain4j}</version>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-stdlib</artifactId>
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<version>${version.lib.kotlin}</version>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-stdlib-common</artifactId>
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<version>${version.lib.kotlin}</version>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-stdlib-jdk8</artifactId>
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<version>${version.lib.kotlin}</version>
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</dependency>
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<!-- Jersey -->
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<dependency>
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<groupId>org.glassfish.jersey.media</groupId>
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<artifactId>jersey-media-json-binding</artifactId>

‎integrations/langchain4j/codegen/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (c) 2025 Oracle and/or its affiliates.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.helidon.integrations.langchain4j</groupId>
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<artifactId>helidon-integrations-langchain4j-project</artifactId>
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<version>4.2.0-SNAPSHOT</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>helidon-integrations-langchain4j-codegen</artifactId>
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<dependencies>
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<dependency>
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<groupId>io.helidon.common</groupId>
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<artifactId>helidon-common</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.common</groupId>
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<artifactId>helidon-common-types</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.codegen</groupId>
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<artifactId>helidon-codegen</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.codegen</groupId>
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<artifactId>helidon-codegen-class-model</artifactId>
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</dependency>
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<dependency>
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<groupId>io.helidon.service</groupId>
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<artifactId>helidon-service-codegen</artifactId>
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</dependency>
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</dependencies>
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</project>

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