Implement support for ECJ

Rejig RAM directory naming, add ability to dump tree view of workspaces

Port across ECJ support

This is still provisional and an active work in progress, please track
eclipse-jdt/eclipse.jdt.core#958 for this work.

Enable tests for eclipse

Run against CI build of ECJ temporarily

Address ShellCheck warnings

Fix ECJ injection script

Add ability to adjust log level in POM

Apply 2025 license headers to new ECJ classes

Use eclipse snapshot repositories

Author: ascopes

.github/workflows/build.yml

@@ -72,8 +72,7 @@ jobs:
         env:
           cache-name: maven-cache
         with:
-          path:
-            ~/.m2
+          path: ~/.m2
           key: build-${{ env.cache-name }}
 
       - name: Compile and run tests

java-compiler-testing/pom.xml

@@ -53,6 +53,11 @@
       <artifactId>assertj-core</artifactId>
     </dependency>
 
+    <dependency>
+      <groupId>org.eclipse.jdt</groupId>
+      <artifactId>ecj</artifactId>
+    </dependency>
+
     <dependency>
       <groupId>org.jspecify</groupId>
       <artifactId>jspecify</artifactId>

java-compiler-testing/src/it/avaje-http/src/test/java/io/github/ascopes/jct/acceptancetests/avajehttp/AvajeHttpTest.java

@@ -18,6 +18,7 @@
 import static io.github.ascopes.jct.assertions.JctAssertions.assertThatCompilation;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import org.junit.jupiter.api.DisplayName;
@@ -26,6 +27,7 @@
 class AvajeHttpTest {
 
   @DisplayName("HTTP client code gets generated as expected")
+  @EcjCompilerTest(minVersion = 11)
   @JavacCompilerTest(minVersion = 11)
   void httpClientCodeGetsGeneratedAsExpected(JctCompiler compiler) {
     // Given
@@ -40,7 +42,7 @@ void httpClientCodeGetsGeneratedAsExpected(JctCompiler compiler) {
 
       // Then
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings()
+          .isSuccessful()
           .classOutputPackages()
           .allFilesExist(
               "org/example/httpclient/GeneratedHttpComponent.class",

java-compiler-testing/src/it/avaje-inject/src/test/java/io/github/ascopes/jct/acceptancetests/avajeinject/AvajeInjectTest.java

@@ -18,6 +18,7 @@
 import static io.github.ascopes.jct.assertions.JctAssertions.assertThatCompilation;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.PathStrategy;
 import io.github.ascopes.jct.workspaces.Workspaces;
@@ -27,6 +28,7 @@
 class AvajeInjectTest {
 
   @DisplayName("Dependency injection code gets generated as expected")
+  @EcjCompilerTest(minVersion = 11)
   @JavacCompilerTest(minVersion = 11)
   void dependencyInjectionCodeGetsGeneratedAsExpected(JctCompiler compiler) {
     // Given
@@ -41,7 +43,7 @@ void dependencyInjectionCodeGetsGeneratedAsExpected(JctCompiler compiler) {
 
       // Then
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings()
+          .isSuccessful()
           .classOutputPackages()
           .allFilesExist(
               "org/example/CoffeeMaker.class",

java-compiler-testing/src/it/avaje-jsonb/src/test/java/io/github/ascopes/jct/acceptancetests/avajejsonb/AvajeJsonbTest.java

@@ -21,6 +21,7 @@
 import io.avaje.jsonb.Jsonb;
 import io.avaje.jsonb.generator.Processor;
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import java.time.Instant;
@@ -30,6 +31,7 @@
 @DisplayName("Avaje Jsonb acceptance tests")
 class AvajeJsonbTest {
   @DisplayName("JSON handling logic is generated as expected")
+  @EcjCompilerTest(minVersion = 11)
   @JavacCompilerTest(minVersion = 11)
   void jsonHandlingLogicIsGeneratedAsExpected(JctCompiler compiler) throws Throwable {
     // Given
@@ -46,7 +48,7 @@ void jsonHandlingLogicIsGeneratedAsExpected(JctCompiler compiler) throws Throwab
 
       // Then
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings();
+          .isSuccessful();
 
       var userClass = compilation
           .getClassOutputs()

java-compiler-testing/src/it/dagger/src/test/java/io/github/ascopes/jct/acceptancetests/dagger/DaggerTest.java

@@ -18,13 +18,15 @@
 import static io.github.ascopes.jct.assertions.JctAssertions.assertThatCompilation;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import org.junit.jupiter.api.DisplayName;
 
 @DisplayName("Dagger acceptance tests")
 class DaggerTest {
   @DisplayName("Dagger DI runs as expected in the annotation processing phase")
+  @EcjCompilerTest
   @JavacCompilerTest
   void daggerDiRunsAsExpectedInTheAnnotationProcessingPhase(JctCompiler compiler) {
     try (var workspace = Workspaces.newWorkspace()) {
@@ -38,7 +40,7 @@ void daggerDiRunsAsExpectedInTheAnnotationProcessingPhase(JctCompiler compiler)
       var compilation = compiler.compile(workspace);
 
       // Then
-      assertThatCompilation(compilation).isSuccessfulWithoutWarnings();
+      assertThatCompilation(compilation).isSuccessful();
 
       assertThatCompilation(compilation)
           .sourceOutputPackages()

java-compiler-testing/src/it/dogfood/src/test/java/io/github/ascopes/jct/acceptancetests/dogfood/JctDogfoodTest.java

@@ -18,6 +18,7 @@
 import static io.github.ascopes.jct.assertions.JctAssertions.assertThat;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import java.io.IOException;
@@ -52,6 +53,7 @@ class JctDogfoodTest {
       .resolve("classes");
 
   @DisplayName("JCT can compile itself as a legacy module source")
+  @EcjCompilerTest(minVersion = 17, configurers = JctCompilationConfigurer.class)
   @JavacCompilerTest(minVersion = 17, configurers = JctCompilationConfigurer.class)
   void jctCanCompileItselfAsLegacyModule(JctCompiler compiler) throws IOException {
     // Given

java-compiler-testing/src/it/google-auto-factory/src/test/java/io/github/ascopes/jct/acceptancetests/autofactory/AutoFactoryTest.java

@@ -19,6 +19,7 @@
 import static org.assertj.core.api.SoftAssertions.assertSoftly;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import java.time.Instant;
@@ -28,6 +29,7 @@
 class AutoFactoryTest {
 
   @DisplayName("The AutoFactory class is created as expected")
+  @EcjCompilerTest
   @JavacCompilerTest
   void autoFactoryClassIsCreatedAsExpected(JctCompiler compiler) throws Throwable {
     try (var workspace = Workspaces.newWorkspace()) {
@@ -42,7 +44,7 @@ void autoFactoryClassIsCreatedAsExpected(JctCompiler compiler) throws Throwable
 
       // Then
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings()
+          .isSuccessful()
           .classOutputPackages()
           .fileExists("org", "example", "UserFactory.class")
           .isNotEmptyFile();

java-compiler-testing/src/it/google-auto-service/src/test/java/io/github/ascopes/jct/acceptancetests/autoservice/AutoServiceTest.java

@@ -18,6 +18,7 @@
 import static io.github.ascopes.jct.assertions.JctAssertions.assertThatCompilation;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import org.junit.jupiter.api.DisplayName;
@@ -26,6 +27,7 @@
 class AutoServiceTest {
 
   @DisplayName("The AutoService descriptor is created as expected")
+  @EcjCompilerTest
   @JavacCompilerTest
   void autoServiceDescriptorIsCreatedAsExpected(JctCompiler compiler) {
     try (var workspace = Workspaces.newWorkspace()) {
@@ -40,7 +42,7 @@ void autoServiceDescriptorIsCreatedAsExpected(JctCompiler compiler) {
 
       // Then
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings()
+          .isSuccessful()
           .classOutputPackages()
           .fileExists("META-INF", "services", "org.example.SomeInterface")
           .hasContent("org.example.SomeImpl");

java-compiler-testing/src/it/google-auto-value/src/test/java/io/github/ascopes/jct/acceptancetests/autovalue/AutoValueTest.java

@@ -19,6 +19,7 @@
 import static org.assertj.core.api.SoftAssertions.assertSoftly;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import java.time.Instant;
@@ -29,6 +30,7 @@
 class AutoValueTest {
 
   @DisplayName("The AutoValue implementation class is created as expected")
+  @EcjCompilerTest
   @JavacCompilerTest
   void autoValueImplementationClassIsCreatedAsExpected(JctCompiler compiler) throws Throwable {
     try (var workspace = Workspaces.newWorkspace()) {
@@ -43,7 +45,7 @@ void autoValueImplementationClassIsCreatedAsExpected(JctCompiler compiler) throw
 
       // Then
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings()
+          .isSuccessful()
           .classOutputPackages()
           .allFilesExist(
               "org/example/AutoValue_User.class",

java-compiler-testing/src/it/immutables/src/test/java/io/github/ascopes/jct/acceptancetests/immutables/ImmutablesTest.java

@@ -19,6 +19,7 @@
 import static org.assertj.core.api.SoftAssertions.assertSoftly;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import java.util.stream.Stream;
@@ -36,6 +37,7 @@
 class ImmutablesTest {
 
   @DisplayName("Immutables @Value produces the expected class")
+  @EcjCompilerTest
   @JavacCompilerTest
   void immutablesValueProducesTheExpectedClass(JctCompiler compiler) throws Throwable {
     try (var workspace = Workspaces.newWorkspace()) {
@@ -68,6 +70,7 @@ void immutablesValueProducesTheExpectedClass(JctCompiler compiler) throws Throwa
   }
 
   @DisplayName("Immutables @Value produces the expected class for modules")
+  @EcjCompilerTest(minVersion = 9)
   @JavacCompilerTest(minVersion = 9)
   void immutablesValueProducesTheExpectedClassForModules(JctCompiler compiler) throws Throwable {
     try (var workspace = Workspaces.newWorkspace()) {

java-compiler-testing/src/it/mapstruct/src/test/java/io/github/ascopes/jct/acceptancetests/mapstruct/MapStructTest.java

@@ -19,6 +19,7 @@
 import static org.assertj.core.api.SoftAssertions.assertSoftly;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import java.util.stream.Stream;
@@ -28,6 +29,7 @@
 class MapStructTest {
 
   @DisplayName("MapStruct generates expected mapping code")
+  @EcjCompilerTest
   @JavacCompilerTest
   void mapStructGeneratesExpectedMappingCode(JctCompiler compiler) throws Throwable {
     try (final var workspace = Workspaces.newWorkspace()) {
@@ -40,7 +42,7 @@ void mapStructGeneratesExpectedMappingCode(JctCompiler compiler) throws Throwabl
       final var compilation = compiler.compile(workspace);
 
       // Then
-      assertThatCompilation(compilation).isSuccessfulWithoutWarnings();
+      assertThatCompilation(compilation).isSuccessful();
 
       final var classLoader = compilation.getFileManager()
           .getClassLoader(StandardLocation.CLASS_OUTPUT);
@@ -68,6 +70,7 @@ void mapStructGeneratesExpectedMappingCode(JctCompiler compiler) throws Throwabl
   }
 
   @DisplayName("MapStruct generates expected mapping code for modules")
+  @EcjCompilerTest(minVersion = 9)
   @JavacCompilerTest(minVersion = 9)
   void mapStructGeneratesExpectedMappingCodeForModules(JctCompiler compiler) throws Throwable {
     try (final var workspace = Workspaces.newWorkspace()) {
@@ -80,7 +83,7 @@ void mapStructGeneratesExpectedMappingCodeForModules(JctCompiler compiler) throw
       final var compilation = compiler.compile(workspace);
 
       // Then
-      assertThatCompilation(compilation).isSuccessfulWithoutWarnings();
+      assertThatCompilation(compilation).isSuccessful();
 
       final var classLoader = compilation.getFileManager()
           .getClassLoader(StandardLocation.CLASS_OUTPUT);

java-compiler-testing/src/it/micronaut/src/test/java/io/github/ascopes/jct/acceptancetests/micronaut/MicronautIntegrationTest.java

@@ -18,6 +18,7 @@
 import static io.github.ascopes.jct.assertions.JctAssertions.assertThatCompilation;
 
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import org.junit.jupiter.api.DisplayName;
@@ -26,6 +27,7 @@
 class MicronautIntegrationTest {
 
   @DisplayName("Micronaut generates the expected code")
+  @EcjCompilerTest(configurers = MicronautConfigurer.class)
   @JavacCompilerTest(configurers = MicronautConfigurer.class)
   void micronautGeneratesTheExpectedCode(JctCompiler compiler) {
     try (var workspace = Workspaces.newWorkspace()) {

java-compiler-testing/src/it/serviceloader-jpms/src/test/java/io/github/ascopes/jct/acceptancetests/serviceloaderjpms/testing/ServiceProcessorJpmsTest.java

@@ -19,6 +19,7 @@
 
 import io.github.ascopes.jct.acceptancetests.serviceloaderjpms.ServiceProcessor;
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import org.junit.jupiter.api.DisplayName;
@@ -27,6 +28,7 @@
 class ServiceProcessorJpmsTest {
 
   @DisplayName("Expected files get created when the processor is run")
+  @EcjCompilerTest(minVersion = 9)
   @JavacCompilerTest(minVersion = 9)
   void expectedFilesGetCreated(JctCompiler compiler) {
     try (var workspace = Workspaces.newWorkspace()) {
@@ -41,7 +43,7 @@ void expectedFilesGetCreated(JctCompiler compiler) {
           .compile(workspace);
 
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings()
+          .isSuccessful()
           .classOutputPackages()
           .fileExists("META-INF", "services", "org.example.InsultProvider")
           .hasContent("org.example.MeanInsultProviderImpl");
@@ -62,7 +64,7 @@ void expectedFilesGetCreatedInMultiModuleRoots(JctCompiler compiler) {
           .compile(workspace);
 
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings()
+          .isSuccessful()
           .classOutputModules().moduleExists("org.example")
           .fileExists("META-INF", "services", "org.example.InsultProvider")
           .hasContent("org.example.MeanInsultProviderImpl");

java-compiler-testing/src/it/serviceloader/src/test/java/io/github/ascopes/jct/acceptancetests/serviceloader/testing/ServiceProcessorTest.java

@@ -19,6 +19,7 @@
 
 import io.github.ascopes.jct.acceptancetests.serviceloader.ServiceProcessor;
 import io.github.ascopes.jct.compilers.JctCompiler;
+import io.github.ascopes.jct.junit.EcjCompilerTest;
 import io.github.ascopes.jct.junit.JavacCompilerTest;
 import io.github.ascopes.jct.workspaces.Workspaces;
 import org.junit.jupiter.api.DisplayName;
@@ -27,6 +28,7 @@
 class ServiceProcessorTest {
 
   @DisplayName("Expected files get created when the processor is run")
+  @EcjCompilerTest
   @JavacCompilerTest
   void expectedFilesGetCreated(JctCompiler compiler) {
     try (var workspace = Workspaces.newWorkspace()) {
@@ -41,7 +43,7 @@ void expectedFilesGetCreated(JctCompiler compiler) {
           .compile(workspace);
 
       assertThatCompilation(compilation)
-          .isSuccessfulWithoutWarnings()
+          .isSuccessful()
           .classOutputPackages()
           .fileExists("META-INF", "services", "org.example.InsultProvider")
           .hasContent("org.example.MeanInsultProviderImpl");