Report dd-java-agent itself as a Maven dependency in SCA telemetry (#10975)

* Report dd-java-agent itself as a Maven dependency in SCA telemetry

Generate META-INF/maven/com.datadoghq/dd-java-agent/pom.properties at
build time so the SCA dependency pipeline (JarReader → DependencyResolver)
detects com.datadoghq:dd-java-agent in the APP_DEPENDENCIES_LOADED
telemetry events.

Add a unit test in DependencyResolverSpecification verifying the resolver
correctly parses the generated pom.properties, and extend the
AbstractServerSmokeTest tracer-dependency assertion to include
com.datadoghq:dd-java-agent so all server smoke tests validate this
end-to-end against the real shadow JAR.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Update telemetry/src/test/groovy/datadog/telemetry/dependency/DependencyResolverSpecification.groovy

Co-authored-by: Brice Dutheil <brice.dutheil@gmail.com>

* Apply reviewer suggestions

- Use built-in Gradle WriteProperties task instead of custom doLast
  action, which handles inputs/outputs/caching natively
- Fix Groovy with{} usage in test: apply it on ZipOutputStream
  (not ZipEntry as incorrectly suggested in the upstream commit)

* Use WriteProperties task and wire srcDir via task provider

Use the built-in Gradle WriteProperties task as suggested by bric3.

Instead of splitting the output directory into a separate variable and
adding an explicit dependsOn (which bric3 did not suggest), derive the
srcDir provider from the task itself via generatePomProperties.map{...}.
This way Gradle infers the processResources -> generatePomProperties
dependency automatically, without extra boilerplate.

* spotless

* Follow existing pattern for generated resources

Follow the same pattern as includedAgentDir/includedJarFileTree:
- declare pomPropertiesDir and pomPropertiesFileTree near the top
- add dependsOn(pomPropertiesFileTree) to processResources
- declare main.resources.srcDir(pomPropertiesDir) in the sourceSets block
- register generatePomProperties (WriteProperties) near generateAgentJarIndex
- wire pomPropertiesFileTree.builtBy(generatePomProperties)

This avoids the need for a task-provider-mapped srcDir since WriteProperties
outputs a single file (not a directory), so the fileTree + builtBy approach
is the correct way to express the dependency.

* Combine srcDirs as suggested by reviewer

Replace two separate srcDir calls with a single srcDirs(includedAgentDir, pomPropertiesDir)
as suggested by bric3.

* Keep original srcDir and add srcDirs per reviewer diff

* Fix duplicate srcDir causing processResources failure

includedAgentDir was registered twice — once via srcDir and again
inside srcDirs. Replace both with a single srcDirs call.

* Fix implicit dependency on generatePomProperties from sourcesJar

sourcesJar includes main.resources srcDirs (including pomPropertiesDir)
but had no dependency on generatePomProperties. Add explicit
dependsOn(pomPropertiesFileTree) consistent with the processResources
wiring.

* chore: trigger CI

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Brice Dutheil <brice.dutheil@gmail.com>

Author: 3 people

dd-java-agent/build.gradle

@@ -19,8 +19,16 @@ configurations {
 def includedAgentDir = project.layout.buildDirectory.dir("generated/included")
 def includedJarFileTree = fileTree(includedAgentDir)
 
+def pomPropertiesDir = project.layout.buildDirectory.dir("generated/maven-metadata")
+def pomPropertiesFileTree = fileTree(pomPropertiesDir)
+
 tasks.named("processResources") {
   dependsOn(includedJarFileTree)
+  dependsOn(pomPropertiesFileTree)
+}
+
+tasks.named("sourcesJar") {
+  dependsOn(pomPropertiesFileTree)
 }
 
 sourceSets {
@@ -33,7 +41,7 @@ sourceSets {
   "main_java11" {
     java.srcDirs "${project.projectDir}/src/main/java11"
   }
-  main.resources.srcDir(includedAgentDir)
+  main.resources.srcDirs(includedAgentDir, pomPropertiesDir)
 }
 
 def java6CompileTask = tasks.named("compileMain_java6Java") {
@@ -324,6 +332,14 @@ def generateAgentJarIndex = tasks.register('generateAgentJarIndex', JavaExec) {
 }
 sourceSets.main.resources.srcDir(generateAgentJarIndex)
 
+def generatePomProperties = tasks.register('generatePomProperties', WriteProperties) {
+  destinationFile = pomPropertiesDir.map { it.file("META-INF/maven/com.datadoghq/dd-java-agent/pom.properties") }
+  property("groupId", "com.datadoghq")
+  property("artifactId", "dd-java-agent")
+  property("version", project.providers.provider { project.version.toString() })
+}
+pomPropertiesFileTree.builtBy(generatePomProperties)
+
 subprojects { Project subProj ->
   // Don't need javadoc task run for internal projects.
   subProj.tasks.withType(Javadoc).configureEach { enabled = false }

dd-smoke-tests/src/main/groovy/datadog/smoketest/AbstractServerSmokeTest.groovy

@@ -183,7 +183,7 @@ abstract class AbstractServerSmokeTest extends AbstractSmokeTest {
 
     and: 'received tracer dependencies'
     // Not exhaustive list of tracer dependencies.
-    Set<String> missingDependencyNames = ['com.github.jnr:jnr-ffi', 'net.bytebuddy:byte-buddy-agent',].toSet()
+    Set<String> missingDependencyNames = ['com.datadoghq:dd-java-agent', 'com.github.jnr:jnr-ffi', 'net.bytebuddy:byte-buddy-agent',].toSet()
     missingDependencyNames.removeAll(dependencyNames) || true
     missingDependencyNames.isEmpty()
 

telemetry/src/test/groovy/datadog/telemetry/dependency/DependencyResolverSpecification.groovy

@@ -95,6 +95,26 @@ class DependencyResolverSpecification extends DepSpecification {
       )
   }
 
+  void 'jar with dd-java-agent pom.properties resolves to com.datadoghq:dd-java-agent'() {
+    given: 'a jar containing META-INF/maven/com.datadoghq/dd-java-agent/pom.properties'
+    File file = new File(testDir, 'dd-java-agent.jar')
+    new ZipOutputStream(new FileOutputStream(file)).with {
+      putNextEntry(new ZipEntry('META-INF/maven/com.datadoghq/dd-java-agent/pom.properties'))
+      write('groupId=com.datadoghq\nartifactId=dd-java-agent\nversion=1.0.0\n'.getBytes('UTF-8'))
+      closeEntry()
+      close()
+    }
+
+    when:
+    List<Dependency> deps = DependencyResolver.resolve(file.toURI())
+
+    then:
+    deps.size() == 1
+    deps[0].name == 'com.datadoghq:dd-java-agent'
+    deps[0].version == '1.0.0'
+    deps[0].hash == null
+  }
+
   void 'jar without manifest and no version in filename gets resolved'() {
     // If no manifest info and no suitable file name - calculate sha1 hash
     knownJarCheck(