add example project for testing snippets

Author: generall

example/.dockerignore

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+.git
+.gradle
+build/
+!build/libs/*.jar
+*.md
+gradlew
+gradlew.bat
+gradle/

example/Dockerfile

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+# Use OpenJDK 11 as base image
+FROM openjdk:11-jdk-slim AS build
+
+# Set working directory
+WORKDIR /app
+
+# Install Gradle
+RUN apt-get update && \
+    apt-get install -y wget unzip && \
+    wget https://services.gradle.org/distributions/gradle-8.4-bin.zip && \
+    unzip gradle-8.4-bin.zip && \
+    rm gradle-8.4-bin.zip && \
+    mv gradle-8.4 /opt/gradle && \
+    ln -s /opt/gradle/bin/gradle /usr/local/bin/gradle && \
+    apt-get remove -y wget unzip && \
+    apt-get autoremove -y && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy source code and build files
+COPY . .
+
+# Build the application fat jar
+RUN gradle --no-daemon clean shadowJar
+
+# Create a runtime image
+FROM openjdk:11-jre-slim
+
+WORKDIR /app
+
+# Copy the built JAR from the build stage (versioned shaded jar)
+COPY --from=build /app/build/libs/app-*-all.jar /app/app.jar
+
+# Set the entrypoint
+ENTRYPOINT ["java", "-jar", "app.jar"]

example/README.md

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+# Simple Qdrant Client Example
+
+This is a simple Java application that demonstrates how to interact with a Qdrant vector database server using the official Qdrant Java client.
+
+## Prerequisites
+
+- Docker installed on your system
+
+## Quick Start
+
+### 1. Start Qdrant
+
+First, make sure Qdrant is running. You can start it with Docker:
+
+```bash
+docker run --rm -it -p 6334:6334 -p 6333:6333 qdrant/qdrant
+```
+
+### 2. Building and Running
+
+```bash
+bash -x build-and-run.sh
+```

example/build-and-run.sh

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+#!/bin/bash
+
+docker build -t qdrant-simple-example .
+
+docker run --rm -it --network host qdrant-simple-example

example/build.gradle

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+plugins {
+    id 'java'
+    id 'application'
+    id 'com.github.johnrengelman.shadow' version '8.1.1'
+}
+
+group = 'io.qdrant.example'
+version = '1.0.0'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    // Qdrant Java client
+    implementation 'io.qdrant:client:1.15.0'
+    
+    // gRPC dependencies - use the same version as Qdrant client
+    implementation 'io.grpc:grpc-netty-shaded:1.65.1'
+    implementation 'io.grpc:grpc-protobuf:1.65.1'
+    implementation 'io.grpc:grpc-stub:1.65.1'
+    implementation 'io.grpc:grpc-services:1.65.1'
+    
+    // Protobuf runtime
+    implementation 'com.google.protobuf:protobuf-java:3.25.4'
+    
+    // Logging
+    implementation 'org.slf4j:slf4j-simple:2.0.14'
+}
+
+application {
+    mainClass = 'io.qdrant.example.QdrantExample'
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+}
+
+// Create a proper fat jar and merge service descriptor files (required by gRPC)
+shadowJar {
+    mergeServiceFiles()
+    archiveBaseName.set('app')
+    archiveClassifier.set('all')
+}
+
+// Keep the plain jar minimal (no dependency unpacking)
+jar {
+    manifest {
+        attributes 'Main-Class': 'io.qdrant.example.QdrantExample'
+    }
+}

example/gradle.properties

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+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+org.gradle.parallel=true
+org.gradle.caching=true

example/src/main/java/io/qdrant/example/QdrantExample.java

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+package io.qdrant.example;
+
+import io.grpc.Grpc;
+import io.grpc.InsecureChannelCredentials;
+import io.grpc.ManagedChannel;
+import io.qdrant.client.QdrantClient;
+import io.qdrant.client.QdrantGrpcClient;
+import io.qdrant.client.grpc.Collections;
+import io.qdrant.client.grpc.Collections.CreateCollection;
+import io.qdrant.client.grpc.Collections.VectorParams;
+import io.qdrant.client.grpc.Collections.Distance;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+
+public class QdrantExample {
+    public static void main(String[] args) {        
+        try {
+            ManagedChannel channel =
+                Grpc.newChannelBuilder(
+                        "localhost:6334", InsecureChannelCredentials.create())
+                    .build();
+            QdrantGrpcClient grpcClient = QdrantGrpcClient.newBuilder(channel, true).build();
+            QdrantClient client = new QdrantClient(grpcClient);
+                        
+            
+            // Create a simple collection
+            String collectionName = "example_collection";
+            
+            client.createCollectionAsync(
+                    collectionName,
+                    VectorParams.newBuilder()
+                        .setDistance(Distance.Cosine)
+                        .setSize(128)
+                        .build()
+                ).get();
+            
+
+            List<String> collections = client.listCollectionsAsync().get();
+            
+            for (String collection : collections) {
+                System.out.println("- " + collection);
+            }
+        
+            client.close();
+            
+        } catch (Exception e) {
+            System.err.println("Error occurred: " + e.getMessage());
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+}