feat(integration): add real Spring Boot 3.x/4.x integration tests (#1357)

Add integration tests using real fat jars from cloudfoundry/java-test-applications
v1.0.0 to verify end-to-end framework injection.

Three tests:
- SB3 (Boot 3.5, Java 17): java-cfenv 3.x injection, cloud profile
  verified via RuntimeLogs (boot3 app lacks RuntimeUtils endpoints)
- SB4 (Boot 4.1, Java 21): java-cfenv 4.x injection, cloud profile
  via /active-profiles, java-cfenv presence via /loaded-jars
- SB4 combined: java-cfenv + container-security-provider env var +
  cf-metrics-exporter javaagent — all in one deployment

Key design decisions:
- Pre-explode fat jars in fixtures_helper_test.go for Docker-mode tests
  to simulate CF staging (CF bits service extracts pushed jars as zip
  before running the buildpack). CF-mode tests pass raw jar to cf push.
  See switchblade#134 for CF-vs-Docker divergence.
- Jars sourced from cloudfoundry/java-test-applications@v1.0.0.

Also:
- Fix dead 404 URL in frameworks_test.go
- Update isSpringBootJar comment in spring_boot.go
- Update README with correct 5-level -run filter patterns

Author: stokpop

src/integration/README.md

@@ -57,16 +57,41 @@ You can also run the tests directly using Go:
 cd src/integration
 
 # Run all tests
-BUILDPACK_FILE=/path/to/buildpack.zip go test -v -timeout 30m
+BUILDPACK_FILE=/path/to/buildpack.zip go test -mod vendor -v -timeout 30m ./
 
-# Run specific test suite
-BUILDPACK_FILE=/path/to/buildpack.zip go test -v -run TestIntegration/Tomcat
-
-# Run on Docker
-BUILDPACK_FILE=/path/to/buildpack.zip go test -v -platform=docker
+# Run on Docker (requires GitHub token)
+BUILDPACK_FILE=/path/to/buildpack.zip go test -mod vendor -v -timeout 30m ./ \
+  -platform=docker -github-token=<token>
 
 # Run offline tests
-BUILDPACK_FILE=/path/to/buildpack.zip go test -v -cached
+BUILDPACK_FILE=/path/to/buildpack.zip go test -mod vendor -v -timeout 30m ./ -cached
+```
+
+### Running a Subset of Tests
+
+The spec framework creates subtests 5 levels deep:
+`TestIntegration/integration/<Suite>/<context>/<it>`
+
+Use `-run` with a regex; Go does substring matching at each `/`-separated level:
+
+```bash
+# All SpringBoot real-jar tests
+-run "TestIntegration/integration/SpringBoot/with_real_Spring_Boot_fat_jars"
+
+# Single test — SB3 only
+-run "TestIntegration/integration/SpringBoot/with_real_Spring_Boot_fat_jars/SB3"
+
+# Single test — SB4 cfenv + loaded-jars
+-run "TestIntegration/integration/SpringBoot/with_real_Spring_Boot_fat_jars/SB4.*cloud_profile"
+
+# Single test — SB4 combined (cfenv + csp + metrics)
+-run "TestIntegration/integration/SpringBoot/with_real_Spring_Boot_fat_jars/SB4.*container-security"
+
+# All Tomcat tests
+-run "TestIntegration/integration/Tomcat"
+
+# All Frameworks tests
+-run "TestIntegration/integration/Frameworks"
 ```
 
 ## Test Organization

src/integration/fixtures_helper_test.go

@@ -0,0 +1,148 @@
+package integration_test
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+const (
+	javaTestAppsReleaseTag = "v1.0.0"
+	javaTestAppsBaseURL = "https://github.com/cloudfoundry/java-test-applications/releases/download/" + javaTestAppsReleaseTag
+	sb3JarName          = "java-main-application-boot3-1.0.0.jar"
+	sb4JarName          = "java-main-application-1.0.0.jar"
+)
+
+// downloadJavaTestAppsJars downloads the pinned SB3 and SB4 fat jars.
+// For Docker-mode tests, jars are extracted (exploded) into fixture directories
+// to simulate what real CF staging does: CF treats the pushed artifact as a zip
+// and extracts it before running the buildpack, so BOOT-INF/ and META-INF/
+// appear as flat files on disk.
+// For CF-mode tests, the raw jar is returned as-is — `cf push -p` handles
+// zip extraction natively.
+//
+// Pre-exploding is the correct pattern for Docker-mode tests: switchblade's
+// Docker mode archives the fixture directory as-is (TGZArchiver), while CF mode
+// delegates to `cf push -p` which handles zip extraction natively.
+// See https://github.com/cloudfoundry/switchblade/issues/134 for details.
+//
+// Returns (sb3FixturePath, sb4FixturePath, cleanup func, error).
+func downloadJavaTestAppsJars(platform string) (string, string, func(), error) {
+	dir, err := os.MkdirTemp("", "java-test-apps-*")
+	if err != nil {
+		return "", "", nil, fmt.Errorf("create temp dir: %w", err)
+	}
+
+	cleanup := func() { os.RemoveAll(dir) }
+
+	type jarEntry struct {
+		jarName string
+		path    string // set after download/extract
+	}
+	entries := []jarEntry{
+		{jarName: sb3JarName},
+		{jarName: sb4JarName},
+	}
+
+	for i := range entries {
+		jarPath := filepath.Join(dir, entries[i].jarName)
+		if err := downloadFile(javaTestAppsBaseURL+"/"+entries[i].jarName, jarPath); err != nil {
+			cleanup()
+			return "", "", nil, fmt.Errorf("download %s: %w", entries[i].jarName, err)
+		}
+
+		if platform == "docker" {
+			// Docker mode: explode jar into directory (simulates CF staging zip extraction).
+			// Switchblade Docker archives the fixture dir as-is via TGZArchiver.
+			explodedDir := filepath.Join(dir, fmt.Sprintf("exploded-%d", i))
+			if err := extractZip(jarPath, explodedDir); err != nil {
+				cleanup()
+				return "", "", nil, fmt.Errorf("extract %s: %w", entries[i].jarName, err)
+			}
+			_ = os.Remove(jarPath)
+			entries[i].path = explodedDir
+		} else {
+			// CF mode: return raw jar path — `cf push -p` handles zip extraction natively.
+			entries[i].path = jarPath
+		}
+	}
+
+	return entries[0].path, entries[1].path, cleanup, nil
+}
+
+// extractZip extracts a zip/jar file into destDir, replicating the flat-file
+// layout that CF staging creates when it unpacks the pushed artifact.
+func extractZip(src, destDir string) error {
+	r, err := zip.OpenReader(src)
+	if err != nil {
+		return fmt.Errorf("open zip: %w", err)
+	}
+	defer r.Close()
+
+	for _, f := range r.File {
+		target := filepath.Join(destDir, f.Name)
+
+		// Guard against zip-slip
+		if !strings.HasPrefix(filepath.Clean(target)+string(os.PathSeparator),
+			filepath.Clean(destDir)+string(os.PathSeparator)) {
+			return fmt.Errorf("zip entry %q escapes destination", f.Name)
+		}
+
+		if f.FileInfo().IsDir() {
+			if err := os.MkdirAll(target, 0755); err != nil {
+				return err
+			}
+			continue
+		}
+
+		if err := os.MkdirAll(filepath.Dir(target), 0755); err != nil {
+			return err
+		}
+
+		out, err := os.OpenFile(target, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, f.Mode())
+		if err != nil {
+			return err
+		}
+
+		rc, err := f.Open()
+		if err != nil {
+			out.Close()
+			return err
+		}
+
+		_, copyErr := io.Copy(out, rc)
+		rc.Close()
+		out.Close()
+		if copyErr != nil {
+			return copyErr
+		}
+	}
+	return nil
+}
+
+func downloadFile(url, dest string) error {
+	client := &http.Client{Timeout: 2 * time.Minute}
+	resp, err := client.Get(url) //nolint:noctx
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("HTTP %d for %s", resp.StatusCode, url)
+	}
+
+	f, err := os.Create(dest)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = io.Copy(f, resp.Body)
+	return err
+}

src/integration/frameworks_test.go

@@ -445,7 +445,7 @@ func testFrameworks(platform switchblade.Platform, fixtures string) func(*testin
 					deployment, logs, err := platform.Deploy.
 						WithServices(map[string]switchblade.Service{
 							"checkmarx-iast": {
-								"url":         "https://github.com/cloudfoundry/java-test-applications/raw/main/java-main-application/java-main-application.jar",
+								"url":         "https://github.com/cloudfoundry/java-test-applications/releases/download/v1.0.0/java-main-application-1.0.0.jar",
 								"manager_url": "https://checkmarx.example.com",
 								"api_key":     "test-api-key-12345",
 							},

src/integration/init_test.go

@@ -28,6 +28,12 @@ var settings struct {
 	GitHubToken          string
 	Platform             string
 	Stack                string
+
+	// Paths to fixture directories containing real Spring Boot fat jars from java-test-applications release.
+	// Each directory holds a single fat jar; passed to switchblade Deploy.Execute as the app source.
+	// Populated in TestIntegration before the suite runs.
+	SB3JarPath string
+	SB4JarPath string
 }
 
 func init() {
@@ -66,6 +72,16 @@ func TestIntegration(t *testing.T) {
 	)
 	Expect(err).NotTo(HaveOccurred())
 
+	// Download real Spring Boot fat jars for java-cfenv integration tests.
+	// Skip in cached/offline mode — tests self-skip when paths are empty.
+	if !settings.Cached {
+		sb3Jar, sb4Jar, cleanupJars, err := downloadJavaTestAppsJars(settings.Platform)
+		Expect(err).NotTo(HaveOccurred(), "failed to download java-test-applications jars for integration tests")
+		defer cleanupJars()
+		settings.SB3JarPath = sb3Jar
+		settings.SB4JarPath = sb4Jar
+	}
+
 	var suite spec.Suite
 	if settings.Serial {
 		suite = spec.New("integration", spec.Report(report.Terminal{}), spec.Sequential())
@@ -75,7 +91,7 @@ func TestIntegration(t *testing.T) {
 
 	// Core container tests
 	suite("Tomcat", testTomcat(platform, fixtures))
-	suite("SpringBoot", testSpringBoot(platform, fixtures))
+	suite("SpringBoot", testSpringBoot(platform, fixtures, settings.SB3JarPath, settings.SB4JarPath))
 	suite("JavaMain", testJavaMain(platform, fixtures))
 	suite("DistZip", testDistZip(platform, fixtures))
 

src/integration/spring_boot_test.go

@@ -11,7 +11,7 @@ import (
 	. "github.com/onsi/gomega"
 )
 
-func testSpringBoot(platform switchblade.Platform, fixtures string) func(*testing.T, spec.G, spec.S) {
+func testSpringBoot(platform switchblade.Platform, fixtures string, sb3JarPath, sb4JarPath string) func(*testing.T, spec.G, spec.S) {
 	return func(t *testing.T, context spec.G, it spec.S) {
 		var (
 			Expect     = NewWithT(t).Expect
@@ -290,5 +290,112 @@ func testSpringBoot(platform switchblade.Platform, fixtures string) func(*testin
 				)).WithEndpoint("/jvm-args"))
 			})
 		})
+
+		// Tests using real Spring Boot fat jars from cloudfoundry/java-test-applications@v1.0.0.
+		// SB4 (java-main-application) exposes RuntimeUtils endpoints (via core module):
+		//   GET /active-profiles          -> ["cloud"] when java-cfenv activates cloud profile
+		//   GET /loaded-jars              -> full classloader chain URLs incl. BOOT-INF/lib/*
+		//   GET /spring-env?key=<prop>    -> Spring Environment property value
+		//   GET /environment-variables    -> raw env vars
+		//   GET /input-arguments          -> JVM input arguments (-javaagent etc.)
+		// SB3 (java-main-application-boot3) does not yet depend on core module — only GET / available.
+		// Cloud profile activation verified via build logs for SB3.
+		// TODO: Update SB3 assertions once cloudfoundry/java-test-applications adds core to boot3 module.
+		context("with real Spring Boot fat jars: java-cfenv injection", func() {
+			it("SB3 (Spring Boot 3.x) -- java-cfenv 3.x, cloud profile via logs", func() {
+				if sb3JarPath == "" {
+					t.Skip("SB3 jar not available")
+				}
+				deployment, logs, err := platform.Deploy.
+					WithServices(map[string]switchblade.Service{
+						"db": {"uri": "postgres://host:5432/dbname"},
+					}).
+					WithEnv(map[string]string{
+						"BP_JAVA_VERSION":        "17",
+						"JBP_CONFIG_JAVA_CF_ENV": "{enabled: true}",
+					}).
+					Execute(name, sb3JarPath)
+				Expect(err).NotTo(HaveOccurred(), logs.String)
+
+				// Buildpack detected and injected correct java-cfenv 3.x
+				Expect(logs.String()).To(ContainSubstring("Java CF Env"))
+				Expect(logs.String()).To(ContainSubstring("3."))
+
+				// java-cfenv activated "cloud" profile — verified via Spring Boot startup log
+				// (SB3 jar doesn't expose /active-profiles endpoint yet)
+				// Use Eventually: RuntimeLogs() may be called before Spring Boot finishes starting.
+				Eventually(func() (string, error) {
+					return deployment.RuntimeLogs()
+				}).Should(ContainSubstring(`profile is active: "cloud"`))
+
+				// App is live
+				Eventually(deployment).Should(matchers.Serve(ContainSubstring("ok")).WithEndpoint("/"))
+			})
+
+			it("SB4 (Spring Boot 4.x) -- java-cfenv 4.x, cloud profile, loaded-jars, vcap mapping", func() {
+				if sb4JarPath == "" {
+					t.Skip("SB4 jar not available")
+				}
+				deployment, logs, err := platform.Deploy.
+					WithServices(map[string]switchblade.Service{
+						"db": {"uri": "postgres://host:5432/dbname"},
+					}).
+					WithEnv(map[string]string{
+						"BP_JAVA_VERSION":        "21",
+						"JBP_CONFIG_JAVA_CF_ENV": "{enabled: true}",
+					}).
+					Execute(name, sb4JarPath)
+				Expect(err).NotTo(HaveOccurred(), logs.String)
+
+				// Buildpack detected and injected correct java-cfenv 4.x
+				Expect(logs.String()).To(ContainSubstring("Java CF Env"))
+				Expect(logs.String()).To(ContainSubstring("4."))
+
+				// java-cfenv activated "cloud" profile — direct endpoint assertion
+				Eventually(deployment).Should(matchers.Serve(
+					ContainSubstring("cloud")).WithEndpoint("/active-profiles"))
+
+				// java-cfenv jar loaded by JarLauncher via BOOT-INF/lib symlink — visible in /loaded-jars
+				// (unlike /class-path which only shows JVM system classpath)
+				Eventually(deployment).Should(matchers.Serve(
+					ContainSubstring("java-cfenv")).WithEndpoint("/loaded-jars"))
+			})
+
+			it("SB4 (Spring Boot 4.x) -- java-cfenv 4.x, container-security-provider, cf-metrics-exporter", func() {
+				if sb4JarPath == "" {
+					t.Skip("SB4 jar not available")
+				}
+				deployment, logs, err := platform.Deploy.
+					WithServices(map[string]switchblade.Service{
+						"db": {"uri": "postgres://host:5432/dbname"},
+					}).
+					WithEnv(map[string]string{
+						"BP_JAVA_VERSION":             "21",
+						"JBP_CONFIG_JAVA_CF_ENV":      "{enabled: true}",
+						// cf-metrics-exporter: rpsType=random + enableLogEmitter requires no external infra
+						"CF_METRICS_EXPORTER_ENABLED": "true",
+						"CF_METRICS_EXPORTER_PROPS":   "rpsType=random,enableLogEmitter",
+					}).
+					Execute(name, sb4JarPath)
+				Expect(err).NotTo(HaveOccurred(), logs.String)
+
+				// java-cfenv: correct 4.x version detected and injected
+				Expect(logs.String()).To(ContainSubstring("Java CF Env"))
+				Expect(logs.String()).To(ContainSubstring("4."))
+
+				// cf-metrics-exporter: -javaagent present in JVM input arguments
+				Expect(logs.String()).To(ContainSubstring("CF Metrics Exporter"))
+				Eventually(deployment).Should(matchers.Serve(
+					ContainSubstring("cf-metrics-exporter")).WithEndpoint("/input-arguments"))
+
+				// container-security-provider: env var set at runtime
+				Eventually(deployment).Should(matchers.Serve(
+					ContainSubstring("CONTAINER_SECURITY_PROVIDER")).WithEndpoint("/environment-variables"))
+
+				// java-cfenv activated "cloud" profile
+				Eventually(deployment).Should(matchers.Serve(
+					ContainSubstring("cloud")).WithEndpoint("/active-profiles"))
+			})
+		})
 	}
-}
+}

src/java/containers/spring_boot.go

@@ -86,10 +86,13 @@ func (s *SpringBootContainer) findSpringBootJar(buildDir string) (string, error)
 	return "", nil
 }
 
-// isSpringBootJar checks if a JAR is a Spring Boot JAR
+// isSpringBootJar checks if a JAR is a Spring Boot JAR by filename heuristic.
+// In real CF staging, the artifact is extracted as a zip before the buildpack runs,
+// so BOOT-INF/ exists on disk and Detect() never reaches this path.
+// This fallback only matters when a fat jar is pushed without prior extraction
+// (e.g. local testing). For a more robust check, read MANIFEST.MF from inside
+// the jar zip and look for Spring-Boot-Version or Start-Class headers.
 func (s *SpringBootContainer) isSpringBootJar(jarPath string) bool {
-	// TODO: In full implementation, we'd extract and check MANIFEST.MF
-	// For now, check file name patterns
 	name := filepath.Base(jarPath)
 	return strings.Contains(name, "spring") ||
 		strings.Contains(name, "boot") ||