feat: add integration tests for Java generator

Makefile

@@ -10,6 +10,7 @@ help:
 	@echo "  test-integration         - Run all integration tests"
 	@echo "  test-integration-csharp  - Run C# integration tests"
 	@echo "  test-integration-go      - Run Go integration tests"
+	@echo "  test-integration-java    - Run Java integration tests"
 	@echo "  test-integration-nodejs  - Run NodeJS integration tests"
 	@echo "  generate                 - Generate all code (API clients, docs, schema)"
 	@echo "  generate-api             - Generate API clients from OpenAPI specs"
@@ -67,6 +68,11 @@ test-integration-angular:
 	@echo "Running Angular integration test with Dagger..."
 	@go run ./test/integration/cmd/angular/run.go
 
+.PHONY: test-integration-java
+test-integration-java:
+	@echo "Running Java integration test with Dagger..."
+	@go run ./test/integration/cmd/java/run.go
+
 .PHONY: test-integration
 test-integration:
 	@echo "Running all integration tests with Dagger..."

test/integration/cmd/java/run.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"dagger.io/dagger"
+	"github.com/open-feature/cli/test/integration"
+)
+
+// Test implements the integration test for the Java generator
+type Test struct {
+	// ProjectDir is the absolute path to the root of the project
+	ProjectDir string
+	// TestDir is the absolute path to the test directory
+	TestDir string
+}
+
+// New creates a new Test
+func New(projectDir, testDir string) *Test {
+	return &Test{
+		ProjectDir: projectDir,
+		TestDir:    testDir,
+	}
+}
+
+// Run executes the Java integration test using Dagger
+func (t *Test) Run(ctx context.Context, client *dagger.Client) (*dagger.Container, error) {
+	// Source code container
+	source := client.Host().Directory(t.ProjectDir)
+	testFiles := client.Host().Directory(t.TestDir, dagger.HostDirectoryOpts{
+		Include: []string{"pom.xml", "src/**/*.java"},
+	})
+
+	// Build the CLI
+	cli := client.Container().
+		From("golang:1.24-alpine").
+		WithExec([]string{"apk", "add", "--no-cache", "git"}).
+		WithDirectory("/src", source).
+		WithWorkdir("/src").
+		WithExec([]string{"go", "mod", "tidy"}).
+		WithExec([]string{"go", "mod", "download"}).
+		WithExec([]string{"go", "build", "-o", "cli", "./cmd/openfeature"})
+
+	// Generate Java client
+	generated := cli.WithExec([]string{
+		"./cli", "generate", "java",
+		"--manifest=/src/sample/sample_manifest.json",
+		"--output=/tmp/generated",
+		"--package-name=dev.openfeature.generated",
+	})
+
+	// Get generated files
+	generatedFiles := generated.Directory("/tmp/generated")
+
+	// Test Java compilation with the generated files
+	javaContainer := client.Container().
+		From("maven:3.9-eclipse-temurin-21-alpine").
+		WithWorkdir("/app").
+		WithDirectory("/app", testFiles).
+		WithDirectory("/app/src/main/java/dev/openfeature/generated", generatedFiles).
+		WithExec([]string{"mvn", "clean", "compile", "-B", "-q"}).
+		WithExec([]string{"mvn", "exec:java", "-Dexec.mainClass=dev.openfeature.Main", "-q"})
+
+	return javaContainer, nil
+}
+
+// Name returns the name of the integration test
+func (t *Test) Name() string {
+	return "java"
+}
+
+func main() {
+	ctx := context.Background()
+
+	// Get project root
+	projectDir, err := os.Getwd()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to get project dir: %v\n", err)
+		os.Exit(1)
+	}
+
+	// Get test directory
+	testDir := filepath.Join(projectDir, "test/java-integration")
+
+	// Create and run the Java integration test
+	test := New(projectDir, testDir)
+
+	if err := integration.RunTest(ctx, test); err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+}

test/integration/cmd/run.go

@@ -45,6 +45,15 @@ func main() {
 		os.Exit(1)
 	}
 
+	// Run the Java integration test
+	javaCmd := exec.Command("go", "run", "github.com/open-feature/cli/test/integration/cmd/java")
+	javaCmd.Stdout = os.Stdout
+	javaCmd.Stderr = os.Stderr
+	if err := javaCmd.Run(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error running Java integration test: %v\n", err)
+		os.Exit(1)
+	}
+
 	// Add more tests here as they are available
 
 	fmt.Println("=== All integration tests passed successfully ===")

test/java-integration/pom.xml

@@ -0,0 +1,48 @@
+<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>dev.openfeature</groupId>
+    <artifactId>cli-java-integration-test</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>21</maven.compiler.source>
+        <maven.compiler.target>21</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <openfeature.sdk.version>1.14.0</openfeature.sdk.version>
+        <maven-compiler-plugin.version>3.11.0</maven-compiler-plugin.version>
+        <exec-maven-plugin.version>3.1.0</exec-maven-plugin.version>
+    </properties>
+
+    <dependencies>
+        <!-- OpenFeature Java SDK -->
+        <dependency>
+            <groupId>dev.openfeature</groupId>
+            <artifactId>sdk</artifactId>
+            <version>${openfeature.sdk.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>${exec-maven-plugin.version}</version>
+                <configuration>
+                    <mainClass>dev.openfeature.Main</mainClass>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

test/java-integration/src/main/java/dev/openfeature/Main.java

@@ -0,0 +1,103 @@
+package dev.openfeature;
+
+import dev.openfeature.generated.*;
+import dev.openfeature.sdk.*;
+import dev.openfeature.sdk.providers.memory.Flag;
+import dev.openfeature.sdk.providers.memory.InMemoryProvider;
+
+import java.util.Map;
+
+public class Main {
+    public static void main(String[] args) {
+        try {
+            run();
+            System.out.println("Generated Java code compiles successfully!");
+        } catch (Exception e) {
+            System.err.println("Error: " + e.getMessage());
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    private static void run() throws Exception {
+        // Set up the in-memory provider with test flags
+        Map<String, Object> themeConfig = Map.of(
+            "primaryColor", "#007bff",
+            "secondaryColor", "#6c757d"
+        );
+
+        Map<String, Flag<?>> flags = Map.of(
+            "discountPercentage", Flag.builder()
+                .variant("default", 0.15)
+                .defaultVariant("default")
+                .build(),
+            "enableFeatureA", Flag.builder()
+                .variant("default", false)
+                .defaultVariant("default")
+                .build(),
+            "greetingMessage", Flag.builder()
+                .variant("default", "Hello there!")
+                .defaultVariant("default")
+                .build(),
+            "usernameMaxLength", Flag.builder()
+                .variant("default", 50)
+                .defaultVariant("default")
+                .build(),
+            "themeCustomization", Flag.builder()
+                .variant("default", new Value(themeConfig))
+                .defaultVariant("default")
+                .build()
+        );
+
+        InMemoryProvider provider = new InMemoryProvider(flags);
+
+        // Set the provider
+        OpenFeatureAPI.getInstance().setProviderAndWait(provider);
+
+        Client client = OpenFeatureAPI.getInstance().getClient();
+        MutableContext evalContext = new MutableContext();
+
+        // Use the generated code for all flag evaluations
+        Boolean enableFeatureA = EnableFeatureA.value(client, evalContext);
+        System.out.println("enableFeatureA: " + enableFeatureA);
+        FlagEvaluationDetails<Boolean> enableFeatureADetails = EnableFeatureA.valueWithDetails(client, evalContext);
+        if (enableFeatureADetails.getErrorCode() != null) {
+            throw new Exception("Error evaluating boolean flag: " + enableFeatureADetails.getFlagKey());
+        }
+
+        Double discount = DiscountPercentage.value(client, evalContext);
+        System.out.printf("Discount Percentage: %.2f%n", discount);
+        FlagEvaluationDetails<Double> discountDetails = DiscountPercentage.valueWithDetails(client, evalContext);
+        if (discountDetails.getErrorCode() != null) {
+            throw new Exception("Failed to get discount for flag: " + discountDetails.getFlagKey());
+        }
+
+        String greetingMessage = GreetingMessage.value(client, evalContext);
+        System.out.println("greetingMessage: " + greetingMessage);
+        FlagEvaluationDetails<String> greetingDetails = GreetingMessage.valueWithDetails(client, evalContext);
+        if (greetingDetails.getErrorCode() != null) {
+            throw new Exception("Error evaluating string flag: " + greetingDetails.getFlagKey());
+        }
+
+        Integer usernameMaxLength = UsernameMaxLength.value(client, evalContext);
+        System.out.println("usernameMaxLength: " + usernameMaxLength);
+        FlagEvaluationDetails<Integer> usernameDetails = UsernameMaxLength.valueWithDetails(client, evalContext);
+        if (usernameDetails.getErrorCode() != null) {
+            throw new Exception("Error evaluating int flag: " + usernameDetails.getFlagKey());
+        }
+
+        Value themeCustomization = ThemeCustomization.value(client, evalContext);
+        FlagEvaluationDetails<Value> themeDetails = ThemeCustomization.valueWithDetails(client, evalContext);
+        if (themeDetails.getErrorCode() != null) {
+            throw new Exception("Error evaluating object flag: " + themeDetails.getFlagKey());
+        }
+        System.out.println("themeCustomization: " + themeCustomization);
+
+        // Test the getKey() method functionality for all flags
+        System.out.println("enableFeatureA flag key: " + EnableFeatureA.getKey());
+        System.out.println("discountPercentage flag key: " + DiscountPercentage.getKey());
+        System.out.println("greetingMessage flag key: " + GreetingMessage.getKey());
+        System.out.println("usernameMaxLength flag key: " + UsernameMaxLength.getKey());
+        System.out.println("themeCustomization flag key: " + ThemeCustomization.getKey());
+    }
+}