feat: add the ESDK TestServer Java Language_Server

test-server/.gitignore

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+# The Commons_Repository is cloned fresh at head on every run (Req 8.2/8.4);
+# never commit the clone back into this Language_Repository.
+.commons-clone/
+
+# Maven versions plugin backup poms produced by build-live-esdk (safety net;
+# the recipe reverts the version, but leave these ignored just in case).
+*.versionsBackup
+
+# Integration test scratch output.
+.it-tmp/
+# jqwik's local failure-sample database (developer-local, not shared).
+**/.jqwik-database

test-server/README.md

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+# ESDK TestServer integration (aws-crypto-tools-java Language_Repository)
+
+This directory wires the live ESDK Java source into the cross-language
+TestServer. It does **not** embed the TestServer; instead it clones the
+`Commons_Repository` fresh at a branch head on every run and orchestrates the
+TestServer against this repo's working tree as the live Java source.
+
+## `commons-source.json` — the single source of truth for commons coordinates
+
+`commons-source.json` is the **Commons_Source_Config** (Requirement 8.2): the
+one place in this Language_Repository that names the `Commons_Repository`
+coordinates — its `name`, repository `url`, and the `branch` to clone at head:
+
+```json
+{
+  "commonsRepository": {
+    "name": "aws-crypto-tools-commons",
+    "url": "git@github.com:aws/aws-crypto-tools-commons.git",
+    "branch": "kessplas/esdk-test-server"
+  }
+}
+```
+
+Both the [`Makefile`](./Makefile) and the CI workflow
+[`.github/workflows/esdk-test-server.yml`](../../.github/workflows/esdk-test-server.yml)
+**read** these coordinates from this file (parsed with `python3` — no `jq`
+dependency) rather than carrying their own hardcoded defaults, so the two never
+drift apart.
+
+- The Makefile exposes `COMMONS_REPO` / `COMMONS_BRANCH` whose **defaults** come
+  from this file; both stay overridable on the command line
+  (`make run COMMONS_BRANCH=some-branch`).
+- The CI workflow resolves the branch from this file, unless a non-empty
+  `commons_branch` `workflow_dispatch`/`workflow_call` input overrides it.
+- If this file is missing or unparseable, both fail fast with an error naming
+  it — it is the single source of truth, so its absence is a hard error.
+
+### Branch default note
+
+The design default for `branch` is `main`. Until the ESDK TestServer merges to
+commons `main`, this file pins the `kessplas/esdk-test-server` feature branch so
+the flow works out of the box. **Once the TestServer merges to commons `main`,
+flip `branch` back to `main` here** — no other file needs to change.
+
+## Common targets
+
+Run `make help` for the full list and the resolved commons coordinates.

test-server/bug-config.json

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+[
+  "decrypt-accepts-out-of-order-frame-sequence",
+  "create-client-accepts-zero-max-encrypted-data-keys",
+  "encrypt-stream-ignores-plaintext-length-bound",
+  "encrypt-rejects-empty-encryption-context-value",
+  "encrypt-accepts-reserved-prefix-encryption-context-key",
+  "encryption-context-value-length-capped-at-32767"
+]

test-server/feature-config.json

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+{
+  "supportedFeatures": [
+    "streaming",
+    "MPL",
+    "hierarchical",
+    "raw-aes",
+    "raw-rsa",
+    "multi",
+    "aws-kms",
+    "aws-kms-multi",
+    "aws-kms-discovery",
+    "aws-kms-mrk",
+    "aws-kms-mrk-multi",
+    "aws-kms-mrk-discovery",
+    "aws-kms-rsa",
+    "required-encryption-context"
+  ],
+  "unsupportedFeatures": [
+    "raw-ecdh",
+    "aws-kms-ecdh",
+    "caching"
+  ]
+}

test-server/server-config.json

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+{
+  "commonsRepository": {
+    "name": "aws-crypto-tools-commons",
+    "url": "git@github.com:aws/aws-crypto-tools-commons.git",
+    "branch": "lucmcdon/esdk-test-server-all-languages"
+  },
+  "product": "esdk"
+}

test-server/server/.gitignore

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+# Gradle
+.gradle/
+build/
+
+# Smithy build output
+smithyprojections/

test-server/server/build.gradle.kts

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+// Builds the Java Language_Server for the ESDK TestServer service over the
+// rpcv2Cbor protocol. The server scaffolding (request decoding, response
+// encoding, routing, error serialization) is generated from the single
+// source-of-truth Smithy model hosted in the aws-crypto-tools-commons
+// repository (esdk/test-server/model), supplied via the REQUIRED `modelDir`
+// Gradle property, by the smithy-java `java-codegen` build plugin in SERVER
+// mode (Requirement 1.7); only the operation handler bodies are hand-written.
+//
+// This repository carries NO copy of the model: the orchestrator always passes
+// -PmodelDir=<resolved commons root>/esdk/test-server/model, and a developer
+// running this module standalone passes it manually.
+//
+// The wire contract is identical to the one the single generated Java
+// Test_Client (commons esdk/test-server/client-java) speaks, because both are
+// generated from the same model with the same protocol declared once at the
+// service level.
+
+plugins {
+    `java-library`
+    // Runs the Smithy build (and thus the java-codegen plugin) during the
+    // Gradle build. Version comes from gradle.properties via settings.
+    id("software.amazon.smithy.gradle.smithy-base")
+}
+
+repositories {
+    // mavenLocal() is listed FIRST so that when the resolved ESDK Java library
+    // source has been installed to the local Maven repository (by the
+    // orchestrator's JavaLaunchPlan: mvn versions:set -> install -> revert
+    // under a distinct version), a matching
+    // `com.amazonaws:aws-encryption-sdk-java:<esdkVersion>` there is consumed
+    // as the LIVE source in place of the published GA artifact. The live flow
+    // installs a DISTINCT version (e.g. 3.0.2-LIVE-SNAPSHOT) and passes
+    // `-PesdkVersion=<that version>`, so head/default runs still resolve the
+    // published artifact from Maven Central below and only an explicit live
+    // run picks up the local build.
+    mavenLocal()
+    mavenCentral()
+}
+
+// smithy-java 1.x baselines on Java 21. Build with a JDK 21+ (set JAVA_HOME to a
+// JDK 21 or newer when invoking Gradle). We intentionally do not pin a Java
+// toolchain version here so the build uses whatever compatible JDK 21+ is
+// configured for Gradle in the environment / CI, mirroring the client-java
+// module.
+
+val smithyJavaVersion: String by project
+val smithyProtocolTraitsVersion: String by project
+val esdkVersion: String by project
+val materialProvidersVersion: String by project
+val awsSdkKmsVersion: String by project
+val jqwikVersion: String by project
+val junitVersion: String by project
+
+dependencies {
+    // --- Code generation (smithy build classpath only) ---
+    // The smithy-java code generation plugins, discovered by the smithyBuild
+    // task via SPI.
+    smithyBuild("software.amazon.smithy.java:codegen-plugin:$smithyJavaVersion")
+    // The rpcv2Cbor protocol trait definition must be resolvable while the
+    // model is built so `smithy.protocols#rpcv2Cbor` is understood by codegen.
+    smithyBuild("software.amazon.smithy:smithy-protocol-traits:$smithyProtocolTraitsVersion")
+
+    // --- Runtime dependencies of the generated server ---
+    // server-core is required by all generated smithy-java servers (routing,
+    // request/response plumbing, the operation/service abstractions).
+    api("software.amazon.smithy.java:server-core:$smithyJavaVersion")
+    // rpcv2Cbor server protocol implementation (request decoding / response and
+    // error encoding), discovered at runtime via SPI; this is the protocol
+    // declared once at the service level in the model.
+    api("software.amazon.smithy.java:server-rpcv2-cbor:$smithyJavaVersion")
+    // The rpcv2Cbor codec is used directly by ConfigMarshaller to round-trip the
+    // config shapes through the exact wire form the protocol uses.
+    implementation("software.amazon.smithy.java:cbor-codec:$smithyJavaVersion")
+    // The runnable ServerBootstrap main() needs the Netty HTTP server provider
+    // (the ServerProvider SPI implementation) on its runtime classpath so
+    // Server.builder() can bind a real HTTP endpoint. This is required only for
+    // the standalone launcher / manual two-step run, not for the generated
+    // server sources themselves.
+    runtimeOnly("software.amazon.smithy.java:server-netty:$smithyJavaVersion")
+
+    // --- Real ESDK Java delegation (Requirement 3.1, 4.2, 4.3) ---
+    // The CreateClient/Encrypt/Decrypt handlers delegate to the REAL AWS
+    // Encryption SDK for Java. For this pass we consume the published GA
+    // artifact from Maven Central (com.amazonaws:aws-encryption-sdk-java), which
+    // transitively pulls in the AWS Cryptographic Material Providers library
+    // (software.amazon.cryptography:aws-cryptographic-material-providers) used to
+    // construct keyrings and CMMs. This is aligned with the version the live
+    // product source declares (aws-crypto-tools-java/esdk/pom.xml -> 3.0.2).
+    //
+    // LIVE-SOURCE MODE (task 11): `esdkVersion` is overridable via
+    // `-PesdkVersion=<v>`. Default runs resolve the published GA artifact from
+    // Maven Central. A live run installs THIS repo's working tree to the local
+    // Maven repository under a distinct version (e.g. 3.0.2-LIVE-SNAPSHOT) and
+    // passes `-PesdkVersion=3.0.2-LIVE-SNAPSHOT`; combined with mavenLocal()
+    // above, the server then delegates to the LIVE ESDK Java build rather than
+    // the published artifact. The ESDK Java `mvn install` consumes the AWS
+    // Cryptographic Material Providers library as a published artifact (the
+    // esdk/pom.xml declares aws-cryptographic-material-providers:<v> from Maven
+    // Central), so no heavy Dafny/Smithy-Dafny transpile is required to build
+    // the live Java source.
+    implementation("com.amazonaws:aws-encryption-sdk-java:$esdkVersion")
+    // The handlers/config factory import the Material Providers keyring & CMM
+    // types directly, so declare the library explicitly (rather than leaning on
+    // the ESDK's transitive compile scope). Version aligned with the ESDK.
+    implementation("software.amazon.cryptography:aws-cryptographic-material-providers:$materialProvidersVersion")
+    // The AWS SDK KMS client. The Material Providers library above declares this
+    // only at `runtime` scope, but the EsdkClientFactory references KmsClient,
+    // EncryptionAlgorithmSpec, and GetPublicKeyRequest directly to fully wire the
+    // five KMS keyring variants (AwsKms/AwsKmsMrk/AwsKmsMultiKeyring/AwsKmsRsa/
+    // AwsKmsDiscovery, task 15.3), so it must be on the compile classpath. Pinned
+    // to the version the Material Providers BOM (2.26.3) resolves. Construction of
+    // a KMS keyring performs no network call; only Encrypt/Decrypt reach AWS KMS.
+    implementation("software.amazon.awssdk:kms:$awsSdkKmsVersion")
+    // The hierarchical keyring's branch-key store reads from DynamoDB.
+    implementation("software.amazon.awssdk:dynamodb:$awsSdkKmsVersion")
+
+    // --- Test dependencies ---
+    // jqwik: the established Java property-based testing library used for the
+    // harness-logic property tests (do not hand-roll PBT).
+    testImplementation("net.jqwik:jqwik:$jqwikVersion")
+    testImplementation("org.junit.jupiter:junit-jupiter-api:$junitVersion")
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:$junitVersion")
+}
+
+// The shared model is owned by the model/ package; this server only consumes
+// it. Disable the formatter so building the server never rewrites the single
+// source-of-truth model file (Requirement 1.1).
+smithy {
+    format.set(false)
+}
+
+// Use the single source-of-truth model hosted in the Commons_Repository
+// (Requirement 1.7) rather than a copy. The location is supplied via the
+// REQUIRED `modelDir` Gradle property; fail fast with a clear message when it
+// is absent so a bare `./gradlew build` cannot silently pick up a stale or
+// wrong model.
+val modelDir: String = providers.gradleProperty("modelDir").orNull
+    ?: throw GradleException(
+        "The Java Language_Server consumes the Smithy model from the commons repository: " +
+            "pass -PmodelDir=<abs path to the commons esdk/test-server/model>"
+    )
+
+sourceSets {
+    main {
+        smithy {
+            srcDir(modelDir)
+        }
+    }
+}
+
+// Add the generated server sources/resources to the main sourceSet so they are
+// compiled alongside the hand-written handlers.
+afterEvaluate {
+    val serverPath = smithy.getPluginProjectionPath(smithy.sourceProjection.get(), "java-codegen").get()
+    sourceSets {
+        main {
+            java {
+                srcDir("$serverPath/java")
+            }
+            resources {
+                srcDir("$serverPath/resources")
+            }
+        }
+    }
+}
+
+// Ensure code generation runs before compilation / resource processing.
+tasks.named("compileJava") {
+    dependsOn("smithyBuild")
+}
+
+tasks.named("processResources") {
+    dependsOn("smithyBuild")
+}
+
+tasks.withType<Test>().configureEach {
+    useJUnitPlatform {
+        // jqwik registers its own JUnit Platform engine; include it explicitly.
+        includeEngines("jqwik", "junit-jupiter")
+    }
+}
+
+// A minimal runnable launcher for the Java Language_Server (task 5 support, NOT
+// the full orchestrator of task 7). Starts the smithy-java rpcv2Cbor HTTP server
+// on a configurable port so a user can run a real over-HTTP round trip manually:
+//
+//   Terminal 1 (start the server on port 8080):
+//     JAVA_HOME=<jdk21+> ./gradlew runServer
+//     # or choose a port:
+//     JAVA_HOME=<jdk21+> ./gradlew runServer --args="9090"
+//     # or:  JAVA_HOME=<jdk21+> ./gradlew runServer -Pport=9090
+//
+//   Terminal 2 (point the Tests at it — from ../../tests):
+//     JAVA_HOME=<jdk21+> ./gradlew test -Desdk.testserver.endpoints=http://127.0.0.1:8080
+//
+// The port may also be supplied via -Pport=<n>, the system property
+// esdk.testserver.port, or the ESDK_TESTSERVER_PORT env var (see ServerBootstrap).
+tasks.register<JavaExec>("runServer") {
+    group = "application"
+    description = "Start the Java Language_Server (rpcv2Cbor HTTP) on a configurable port."
+    mainClass.set("aws.cryptography.esdk.testserver.server.launcher.ServerBootstrap")
+    classpath = sourceSets["main"].runtimeClasspath
+    // Allow `-Pport=<n>` as a convenience in addition to CLI args / sys prop / env.
+    (project.findProperty("port") as String?)?.let {
+        systemProperty("esdk.testserver.port", it)
+    }
+}

test-server/server/gradle.properties

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+# Versions for the Java Language_Server, kept in lockstep with the single
+# generated Java Test_Client (../client-java) so the wire contract is identical
+# on both ends. smithy-java 1.4.0 is the current stable release on Maven Central;
+# the Smithy Gradle plugin (smithy-base) is versioned independently and is also
+# at 1.4.0. smithyProtocolTraitsVersion matches the pin used by the model's own
+# smithy-build.json so the rpcv2Cbor protocol trait resolves identically during
+# code generation.
+#
+# The smithy-java codegen version and the smithy-java server runtime are kept in
+# lockstep (both 1.4.0).
+smithyGradleVersion=1.4.0
+smithyJavaVersion=1.4.0
+smithyProtocolTraitsVersion=1.58.0
+
+# The published AWS Encryption SDK for Java GA artifact, consumed from Maven
+# Central for this pass to prove the harness end-to-end. Aligned with the
+# version the live product source declares (aws-crypto-tools-java/esdk 3.0.2);
+# it transitively brings in the AWS Cryptographic Material Providers library.
+esdkVersion=3.0.2
+
+# The AWS Cryptographic Material Providers library (keyrings & CMMs), aligned
+# with the version the ESDK 3.0.2 product source declares.
+materialProvidersVersion=1.7.0
+
+# The AWS SDK for Java v2 KMS client version. The Material Providers library
+# 1.7.0 declares the AWS SDK KMS dependency only at `runtime` scope (via the
+# `software.amazon.awssdk:bom` 2.26.3), so the EsdkClientFactory — which now
+# references `KmsClient`, `EncryptionAlgorithmSpec`, and `GetPublicKeyRequest`
+# directly to fully wire the five KMS keyring variants (task 15.3) — declares
+# the KMS SDK explicitly on the compile classpath, pinned to the same version
+# the Material Providers BOM resolves so the two stay in lockstep.
+awsSdkKmsVersion=2.26.3
+
+# jqwik is the established Java property-based testing library used for the
+# harness-logic property tests (design Testing Strategy). JUnit 5 platform hosts
+# both jqwik and the example-based unit tests.
+jqwikVersion=1.9.2
+junitVersion=5.11.3
+
+# Run the Smithy CLI in a forked process to isolate its classloader from Gradle.
+org.gradle.jvmargs=-Xmx2g

test-server/server/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists