Agent Executor

String userHomeDir = System.getProperty("user.home");
String localRespoUrl = "file://" + userHomeDir + "/.m2/repository/";
String langchain4jVersion = "0.35.0"

add local maven repository

%dependency /add-repo local \{localRespoUrl} release|never snapshot|always
%dependency /list-repos

Repository local url: file:///Users/bsorrentino/.m2/repository/ added.
Repositories count: 4
name: central url: https://repo.maven.apache.org/maven2/ release:true update:never snapshot:false update:never 
name: jboss url: https://repository.jboss.org/nexus/content/repositories/releases/ release:true update:never snapshot:false update:never 
name: atlassian url: https://packages.atlassian.com/maven/public release:true update:never snapshot:false update:never 
name: local url: file:///Users/bsorrentino/.m2/repository/ release:true update:never snapshot:true update:always 


Remove installed package from Jupiter cache

%%bash 
rm -rf \{userHomeDir}/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/bsc/langgraph4j

Install required maven dependencies

%dependency /add org.slf4j:slf4j-jdk14:2.0.9
%dependency /add org.bsc.langgraph4j:langgraph4j-core-jdk8:1.0-SNAPSHOT
%dependency /add org.bsc.langgraph4j:langgraph4j-langchain4j:1.0-SNAPSHOT
%dependency /add org.bsc.langgraph4j:langgraph4j-agent-executor:1.0-SNAPSHOT
%dependency /add dev.langchain4j:langchain4j:\{langchain4jVersion}
%dependency /add dev.langchain4j:langchain4j-open-ai:\{langchain4jVersion}

%dependency /resolve

Adding dependency org.slf4j:slf4j-jdk14:2.0.9
Adding dependency org.bsc.langgraph4j:langgraph4j-core-jdk8:1.0-SNAPSHOT
Adding dependency org.bsc.langgraph4j:langgraph4j-langchain4j:1.0-SNAPSHOT
Adding dependency org.bsc.langgraph4j:langgraph4j-agent-executor:1.0-SNAPSHOT
Adding dependency dev.langchain4j:langchain4j:0.35.0
Adding dependency dev.langchain4j:langchain4j-open-ai:0.35.0
Solving dependencies
Resolved artifacts count: 27
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/slf4j/slf4j-jdk14/2.0.9/slf4j-jdk14-2.0.9.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/slf4j/slf4j-api/2.0.9/slf4j-api-2.0.9.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/bsc/langgraph4j/langgraph4j-core-jdk8/1.0-SNAPSHOT/langgraph4j-core-jdk8-1.0-SNAPSHOT.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/bsc/async/async-generator-jdk8/2.2.0/async-generator-jdk8-2.2.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/bsc/langgraph4j/langgraph4j-langchain4j/1.0-SNAPSHOT/langgraph4j-langchain4j-1.0-SNAPSHOT.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/bsc/langgraph4j/langgraph4j-agent-executor/1.0-SNAPSHOT/langgraph4j-agent-executor-1.0-SNAPSHOT.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/dev/langchain4j/langchain4j/0.35.0/langchain4j-0.35.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/dev/langchain4j/langchain4j-core/0.35.0/langchain4j-core-0.35.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/google/code/gson/gson/2.10.1/gson-2.10.1.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/apache/opennlp/opennlp-tools/1.9.4/opennlp-tools-1.9.4.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/dev/langchain4j/langchain4j-open-ai/0.35.0/langchain4j-open-ai-0.35.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/dev/ai4j/openai4j/0.22.0/openai4j-0.22.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/squareup/retrofit2/retrofit/2.9.0/retrofit-2.9.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/squareup/retrofit2/converter-jackson/2.9.0/converter-jackson-2.9.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/fasterxml/jackson/core/jackson-databind/2.17.2/jackson-databind-2.17.2.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/fasterxml/jackson/core/jackson-annotations/2.17.2/jackson-annotations-2.17.2.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/fasterxml/jackson/core/jackson-core/2.17.2/jackson-core-2.17.2.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/squareup/okhttp3/okhttp/4.12.0/okhttp-4.12.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/squareup/okio/okio/3.6.0/okio-3.6.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/squareup/okio/okio-jvm/3.6.0/okio-jvm-3.6.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/squareup/okhttp3/okhttp-sse/4.12.0/okhttp-sse-4.12.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.9.10/kotlin-stdlib-jdk8-1.9.10.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/jetbrains/kotlin/kotlin-stdlib/1.9.10/kotlin-stdlib-1.9.10.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/jetbrains/kotlin/kotlin-stdlib-common/1.9.10/kotlin-stdlib-common-1.9.10.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/jetbrains/annotations/13.0/annotations-13.0.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.9.10/kotlin-stdlib-jdk7-1.9.10.jar
Add to classpath: /Users/bsorrentino/Library/Jupyter/kernels/rapaio-jupyter-kernel/mima_cache/com/knuddels/jtokkit/1.1.0/jtokkit-1.1.0.jar


Initialize Logger

try( var file = new java.io.FileInputStream("./logging.properties")) {
    var lm = java.util.logging.LogManager.getLogManager();
    lm.checkAccess(); 
    lm.readConfiguration( file );
}

var log = org.slf4j.LoggerFactory.getLogger("AgentExecutor");

Create Tools

import dev.langchain4j.agent.tool.P;
import dev.langchain4j.agent.tool.Tool;

import java.util.Optional;

import static java.lang.String.format;

public class TestTool {
    private String lastResult;

    Optional<String> lastResult() {
        return Optional.ofNullable(lastResult);
    }

    @Tool("tool for test AI agent executor")
    String execTest(@P("test message") String message) {

        lastResult = format( "test tool executed: %s", message);
        return lastResult;
    }
}

import static org.bsc.langgraph4j.StateGraph.END;
import static org.bsc.langgraph4j.StateGraph.START;
import org.bsc.langgraph4j.CompileConfig;
import org.bsc.langgraph4j.RunnableConfig;
import org.bsc.langgraph4j.checkpoint.BaseCheckpointSaver;
import org.bsc.langgraph4j.checkpoint.MemorySaver;
import org.bsc.langgraph4j.state.AgentState;
import org.bsc.langgraph4j.serializer.StateSerializer;

import org.bsc.langgraph4j.agentexecutor.AgentExecutor;

import dev.langchain4j.model.openai.OpenAiChatModel;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;



var chatLanguageModel = OpenAiChatModel.builder()
    .apiKey( System.getenv("OPENAI_API_KEY") )
    //.modelName( "gpt-3.5-turbo-0125" )
    .modelName( "gpt-4o-mini" )
    .logResponses(true)
    .maxRetries(2)
    .temperature(0.0)
    .maxTokens(2000)
    .build();

var agentExecutor = new AgentExecutor();

var stateGraph = agentExecutor.graphBuilder()
        .chatLanguageModel(chatLanguageModel)
        .objectsWithTools(List.of(new TestTool()))
        .build();