diff --git a/src/main/java/org/jastadd/preprocessor/testing/plugin/CompilerLocationExtension.java b/src/main/java/org/jastadd/preprocessor/testing/plugin/CompilerLocationExtension.java
index 362d47e930b173ce4e2173a7a4ca8897110740ad..2e24b49326719b0bf25046d799784da39593a907 100644
--- a/src/main/java/org/jastadd/preprocessor/testing/plugin/CompilerLocationExtension.java
+++ b/src/main/java/org/jastadd/preprocessor/testing/plugin/CompilerLocationExtension.java
@@ -11,18 +11,32 @@ import org.gradle.api.provider.Property;
  * @author rschoene - Initial contribution
  */
 public class CompilerLocationExtension {
+  public Property<String> jastaddCompilerLocation;
+  public Property<FileCollection> jastaddCompilerConfiguration;
   public Property<String> relastCompilerLocation;
   public Property<FileCollection> relastCompilerConfiguration;
   public Property<String> ragconnectCompilerLocation;
   public Property<FileCollection> ragconnectCompilerConfiguration;
 
   public CompilerLocationExtension(Project project) {
+    jastaddCompilerLocation = project.getObjects().property(String.class);
+    jastaddCompilerConfiguration = project.getObjects().property(FileCollection.class);
     relastCompilerLocation = project.getObjects().property(String.class);
     relastCompilerConfiguration = project.getObjects().property(FileCollection.class);
     ragconnectCompilerLocation = project.getObjects().property(String.class);
     ragconnectCompilerConfiguration = project.getObjects().property(FileCollection.class);
   }
 
+  @Deprecated
+  @ReplacedBy("jastaddCompilerConfiguration")
+  public Property<String> getJastAddCompilerLocation() {
+    return jastaddCompilerLocation;
+  }
+
+  public Property<FileCollection> getJastAddCompilerConfiguration() {
+    return jastaddCompilerConfiguration;
+  }
+
   @Deprecated
   @ReplacedBy("relastCompilerConfiguration")
   public Property<String> getRelastCompilerLocation() {
diff --git a/src/main/java/org/jastadd/preprocessor/testing/plugin/PreprocessorPlugin.java b/src/main/java/org/jastadd/preprocessor/testing/plugin/PreprocessorPlugin.java
index fa5289fd6f05c8c3ed3f40721c5f81a7907e0abe..1562c53e6f53aabfb9dd7bc3698e26a3492f5e86 100644
--- a/src/main/java/org/jastadd/preprocessor/testing/plugin/PreprocessorPlugin.java
+++ b/src/main/java/org/jastadd/preprocessor/testing/plugin/PreprocessorPlugin.java
@@ -29,6 +29,8 @@ public class PreprocessorPlugin implements Plugin<Project> {
 
     // set compiler locations (if set)
     project.afterEvaluate(p -> {
+      RelastTest.setJastAddCompilerLocation(extension.getJastAddCompilerLocation().getOrNull());
+      RelastTest.setJastAddCompilerConfiguration(extension.getJastAddCompilerConfiguration().getOrNull());
       RelastTest.setRelastCompilerLocation(extension.getRelastCompilerLocation().getOrNull());
       RelastTest.setRelastCompilerConfiguration(extension.getRelastCompilerConfiguration().getOrNull());
       RagConnectTest.setRagconnectCompilerLocation(extension.getRagconnectCompilerLocation().getOrNull());
diff --git a/src/main/java/org/jastadd/preprocessor/testing/plugin/RagConnectTest.java b/src/main/java/org/jastadd/preprocessor/testing/plugin/RagConnectTest.java
index 0bdfc734b56a689781e2752c2492a4e65756cbba..0f4ad73687e7715c4acefc18a9c62d2f71723b7c 100644
--- a/src/main/java/org/jastadd/preprocessor/testing/plugin/RagConnectTest.java
+++ b/src/main/java/org/jastadd/preprocessor/testing/plugin/RagConnectTest.java
@@ -94,11 +94,11 @@ public abstract class RagConnectTest extends RelastTest {
       FileCollection runtimeClasspath = sourceSets.getByName(SourceSet.MAIN_SOURCE_SET_NAME).getRuntimeClasspath();
       project.javaexec(javaExecSpec -> {
         List<Object> args = new ArrayList<>();
-        javaExecSpec.setClasspath(runtimeClasspath);
         if (ragconnectCompilerLocation != null) {
           if (isVerbose()) {
             System.err.println("ragconnectCompilerLocation is deprecated, use ragconnectCompilerConfiguration instead");
           }
+          javaExecSpec.setClasspath(runtimeClasspath);
           javaExecSpec.setMain("-jar");
           args.add(ragconnectCompilerLocation);
         } else {
diff --git a/src/main/java/org/jastadd/preprocessor/testing/plugin/RelastTest.java b/src/main/java/org/jastadd/preprocessor/testing/plugin/RelastTest.java
index 03491c5639db650d0da8315548d8e500b23f281e..e98def445a141b444434722d5e55b9efeeb2b499 100644
--- a/src/main/java/org/jastadd/preprocessor/testing/plugin/RelastTest.java
+++ b/src/main/java/org/jastadd/preprocessor/testing/plugin/RelastTest.java
@@ -26,6 +26,8 @@ import static groovy.lang.Closure.DELEGATE_FIRST;
  */
 public abstract class RelastTest extends DefaultTask {
   // configuration from plugin
+  private static String jastaddCompilerLocation;
+  private static FileCollection jastaddCompilerConfiguration;
   private static String relastCompilerLocation;
   private static FileCollection relastCompilerConfiguration;
 
@@ -35,6 +37,14 @@ public abstract class RelastTest extends DefaultTask {
   @Nested
   abstract JastAddConfiguration getJastadd();
 
+  public static void setJastAddCompilerLocation(String jastaddCompilerLocation) {
+    RelastTest.jastaddCompilerLocation = jastaddCompilerLocation;
+  }
+
+  public static void setJastAddCompilerConfiguration(FileCollection jastaddCompilerConfiguration) {
+    RelastTest.jastaddCompilerConfiguration = jastaddCompilerConfiguration;
+  }
+
   public static void setRelastCompilerLocation(String relastCompilerLocation) {
     RelastTest.relastCompilerLocation = relastCompilerLocation;
   }
@@ -119,11 +129,11 @@ public abstract class RelastTest extends DefaultTask {
       FileCollection runtimeClasspath = sourceSets.getByName(SourceSet.MAIN_SOURCE_SET_NAME).getRuntimeClasspath();
       project.javaexec(javaExecSpec -> {
         List<String> args = new ArrayList<>();
-        javaExecSpec.setClasspath(runtimeClasspath);
         if (RelastTest.relastCompilerLocation != null) {
           if (isVerbose()) {
             System.err.println("relastCompilerLocation is deprecated, use relastCompilerConfiguration instead");
           }
+          javaExecSpec.setClasspath(runtimeClasspath);
           javaExecSpec.setMain("-jar");
           args.add(RelastTest.relastCompilerLocation);
         } else {
@@ -175,9 +185,18 @@ public abstract class RelastTest extends DefaultTask {
         SourceSetContainer sourceSets = (SourceSetContainer) project.getProperties().get("sourceSets");
         FileCollection runtimeClasspath = sourceSets.getByName(SourceSet.MAIN_SOURCE_SET_NAME).getRuntimeClasspath();
         project.javaexec(javaExecSpec -> {
-          javaExecSpec.setClasspath(runtimeClasspath);
-          javaExecSpec.setMain("org.jastadd.JastAdd");
           List<Object> args = new ArrayList<>();
+          if (RelastTest.jastaddCompilerLocation != null) {
+            if (isVerbose()) {
+              System.err.println("jastaddCompilerLocation is deprecated, use jastaddCompilerConfiguration instead");
+            }
+            javaExecSpec.setClasspath(runtimeClasspath);
+            javaExecSpec.setMain("-jar");
+            args.add(RelastTest.jastaddCompilerLocation);
+          } else {
+            javaExecSpec.setClasspath(RelastTest.jastaddCompilerConfiguration);
+            javaExecSpec.getMainClass().set("org.jastadd.JastAdd");
+          }
           args.add("--o=" + pathToAbsoluteProject(getJastadd().getOutputDirOrDefault().getPath()));
           args.add("--package=" + getJastadd().getPackageName());
           if (getJastadd().getJastAddList() != null) {