Optional Espresso support with ENSO_JAVA=espresso env variable

.vscode/settings.json

@@ -5,5 +5,8 @@
   "vue.complete.casing.tags": "pascal",
   "auto-snippets.snippets": [
     { "language": "vue", "snippet": "Vue single-file component" }
-  ]
+  ],
+  "files.watcherExclude": {
+    "**/target": true
+  }
 }

CHANGELOG.md

@@ -925,6 +925,7 @@
 - [Warning.get_all returns only unique warnings][6372]
 - [Reimplement `enso_project` as a proper builtin][6352]
 - [Limit number of reported warnings per value][6577]
+- [Experimental support for Espresso Java interpreter][6966]
 - [Suggestions are updated only when the type of the expression changes][6755]
 - [Add project creation time to project metadata][6780]
 - [Upgrade GraalVM to 22.3.1 JDK17][6750]
@@ -1066,6 +1067,7 @@
 [6372]: https://github.com/enso-org/enso/pull/6372
 [6352]: https://github.com/enso-org/enso/pull/6352
 [6577]: https://github.com/enso-org/enso/pull/6577
+[6966]: https://github.com/enso-org/enso/pull/6966
 [6750]: https://github.com/enso-org/enso/pull/6750
 [6755]: https://github.com/enso-org/enso/pull/6755
 [6780]: https://github.com/enso-org/enso/pull/6780

build.sbt

@@ -1699,11 +1699,25 @@ lazy val `engine-runner` = project
           "-H:IncludeResources=.*Main.enso$",
           "--macro:truffle",
           "--language:js",
-          //          "-g",
+          // "-g",
           //          "-H:+DashboardAll",
           //          "-H:DashboardDump=runner.bgv"
           "-Dnic=nic"
-        ),
+        ) ++ (if (
+                org.graalvm.polyglot.Engine
+                  .create()
+                  .getLanguages()
+                  .containsKey("java")
+              ) {
+                Seq(
+                  "-Dorg.graalvm.launcher.home=" + System.getProperty(
+                    "java.home"
+                  ),
+                  "--language:java"
+                )
+              } else {
+                Seq()
+              }),
         mainClass = Option("org.enso.runner.Main"),
         cp        = Option("runtime.jar"),
         initializeAtRuntime = Seq(
@@ -1711,6 +1725,7 @@ lazy val `engine-runner` = project
           "io.methvin.watchservice.jna.CarbonAPI",
           "org.enso.syntax2.Parser",
           "zio.internal.ZScheduler$$anon$4",
+          "org.enso.runner.Main$",
           "sun.awt",
           "sun.java2d",
           "sun.font",

docs/infrastructure/native-image.md

@@ -201,20 +201,71 @@ safely.
 ### Engine runner Configuration
 
 The Native Image generation for the Engine Runner is currently in a preview
-state. Limitations are currently mostly due to
+state. To generate the Native Image for runner simply execute
-[Java interop](https://www.pivotaltracker.com/story/show/183260380) and loading
-of stdlib components. To generate the Native Image for runner simply execute
 
-```
+```bash
 sbt> engine-runner/buildNativeImage
 ```
 
 and execute the binary on a sample factorial test program
 
-```
+```bash
 > runner --run engine/runner-native/src/test/resources/Factorial.enso 6
 ```
 
 The task that generates the Native Image, along with all the necessary
 configuration, reside in a separate project due to a bug in the currently used
-GraalVM version.
+GraalVM version. As September 2023 it can execute all Enso code, but cannot
+invoke `IO.println` or other library functions that require
+[polyglot java import](../../docs/polyglot/java.md), but read on...
+
+### Engine with Espresso
+
+Since [PR-6966](https://github.com/enso-org/enso/pull/6966) there is an
+experimental support for including
+[Espresso Java interpreter](https://www.graalvm.org/jdk17/reference-manual/java-on-truffle/)
+to allow use of some library functions (like `IO.println`) in the _Native Image_
+built runner.
+
+The support can be enabled by setting environment variable `ENSO_JAVA=espresso`
+and making sure Espresso is installed in GraalVM executing the Enso engine -
+e.g. by running `graalvm/bin/gu install espresso`. Then execute:
+
+```bash
+$ cat >hello.enso
+import Standard.Base.IO
+
+main = IO.println <| "Hello World!"
+
+$ ENSO_JAVA=espresso ./enso-x.y.z-dev/bin/enso --run hello.enso
+```
+
+Unless you see a warning containing _"No language for id java found."_ your code
+has just successfully been executed by
+[Espresso](https://www.graalvm.org/jdk17/reference-manual/java-on-truffle/)! To
+debug just add `JAVA_OPTS` environment variable set to your IDE favorite value:
+
+```bash
+$ JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,address=5005 ENSO_JAVA=espresso enso --run hello.enso
+```
+
+Espresso support works also with
+[native image support](#engine-runner-configuration). Just make sure Espresso is
+installed in your GraalVM (via `gu install espresso`) and then rebuild the
+`runner` executable:
+
+```bash
+enso$ rm runner
+enso$ sbt --java-home /graalvm
+sbt> engine-runner/buildNativeImage
+```
+
+as suggested in the [native image support](#engine-runner-configuration). The
+build script detects presence of Espresso and automatically adds
+`--language:java` when creating the image. Then you can use
+
+```bash
+$ ENSO_JAVA=espresso ./runner --run hello.enso
+```
+
+to execute native image `runner` build of Enso together with Espresso.

engine/language-server/src/main/scala/org/enso/languageserver/boot/MainModule.scala

@@ -50,6 +50,7 @@ import org.enso.logger.akka.AkkaConverter
 import org.enso.polyglot.{HostAccessFactory, RuntimeOptions, RuntimeServerInfo}
 import org.enso.searcher.sql.{SqlDatabase, SqlSuggestionsRepo}
 import org.enso.text.{ContentBasedVersioning, Sha3_224VersionCalculator}
+import org.graalvm.polyglot.Engine
 import org.graalvm.polyglot.Context
 import org.graalvm.polyglot.io.MessageEndpoint
 import org.slf4j.event.Level
@@ -286,7 +287,7 @@ class MainModule(serverConfig: LanguageServerConfig, logLevel: Level) {
   val stdInSink = new ObservableOutputStream
   val stdIn     = new ObservablePipedInputStream(stdInSink)
 
-  val context = Context
+  val builder = Context
     .newBuilder()
     .allowAllAccess(true)
     .allowHostAccess(new HostAccessFactory().allWithTypeMapping())
@@ -319,7 +320,22 @@ class MainModule(serverConfig: LanguageServerConfig, logLevel: Level) {
         connection
       } else null
     })
-    .build()
+  if (
+    Engine
+      .newBuilder()
+      .allowExperimentalOptions(true)
+      .build
+      .getLanguages()
+      .containsKey("java")
+  ) {
+    builder
+      .option("java.ExposeNativeJavaVM", "true")
+      .option("java.Polyglot", "true")
+      .option("java.UseBindingsLoader", "true")
+      .allowCreateThread(true)
+  }
+
+  val context = builder.build()
   log.trace("Created Runtime context [{}].", context)
 
   system.eventStream.setLogLevel(AkkaConverter.toAkka(logLevel))

engine/runner/src/main/scala/org/enso/runner/ContextFactory.scala

@@ -7,6 +7,7 @@ import org.enso.polyglot.debugger.{
   DebuggerSessionManagerEndpoint
 }
 import org.enso.polyglot.{HostAccessFactory, PolyglotContext, RuntimeOptions}
+import org.graalvm.polyglot.Engine
 import org.graalvm.polyglot.Context
 import org.slf4j.event.Level
 
@@ -51,12 +52,22 @@ class ContextFactory {
     executionEnvironment.foreach { name =>
       options.put("enso.ExecutionEnvironment", name)
     }
+    var javaHome = System.getenv("JAVA_HOME");
+    if (javaHome == null) {
+      javaHome = System.getProperty("java.home");
+    }
+    if (javaHome == null) {
+      throw new IllegalStateException("Specify JAVA_HOME environment property");
+    }
     val logLevelName = Converter.toJavaLevel(logLevel).getName
     val builder = Context
       .newBuilder()
       .allowExperimentalOptions(true)
       .allowAllAccess(true)
-      .allowHostAccess(new HostAccessFactory().allWithTypeMapping())
+      .allowHostAccess(
+        new HostAccessFactory()
+          .allWithTypeMapping()
+      )
       .option(RuntimeOptions.PROJECT_ROOT, projectRoot)
       .option(RuntimeOptions.STRICT_ERRORS, strictErrors.toString)
       .option(RuntimeOptions.WAIT_FOR_PENDING_SERIALIZATION_JOBS, "true")
@@ -95,10 +106,25 @@ class ContextFactory {
         "bin"
       ),
       "graalpy"
-    );
+    )
     if (graalpy.exists()) {
       builder.option("python.Executable", graalpy.getAbsolutePath());
     }
+    if (
+      Engine
+        .newBuilder()
+        .allowExperimentalOptions(true)
+        .build()
+        .getLanguages()
+        .containsKey("java")
+    ) {
+      builder
+        .option("java.ExposeNativeJavaVM", "true")
+        .option("java.Polyglot", "true")
+        .option("java.UseBindingsLoader", "true")
+        .option("java.JavaHome", javaHome)
+        .allowCreateThread(true)
+    }
     new PolyglotContext(builder.build)
   }
 }

engine/runtime/src/main/java/org/enso/interpreter/node/ExpressionNode.java

@@ -79,10 +79,19 @@ public abstract class ExpressionNode extends BaseNode implements InstrumentableN
    */
   @Override
   public SourceSection getSourceSection() {
+    var bounds = getSourceSectionBounds();
+    return bounds == null ? null : EnsoRootNode.findSourceSection(getRootNode(), bounds[0], bounds[1]);
+  }
+
+  public int[] getSourceSectionBounds() {
     if (this instanceof ExpressionNodeWrapper wrapper) {
-      return wrapper.getDelegateNode().getSourceSection();
+      return wrapper.getDelegateNode().getSourceSectionBounds();
     } else {
-      return EnsoRootNode.findSourceSection(getRootNode(), sourceStartIndex, sourceLength);
+      if (sourceStartIndex == EnsoRootNode.NO_SOURCE && sourceLength == EnsoRootNode.NO_SOURCE) {
+        return null;
+      } else {
+        return new int[] { sourceStartIndex, sourceLength };
+      }
     }
   }
 

engine/runtime/src/main/java/org/enso/interpreter/node/callable/function/StatementNode.java

@@ -3,7 +3,6 @@ package org.enso.interpreter.node.callable.function;
 import com.oracle.truffle.api.frame.VirtualFrame;
 import com.oracle.truffle.api.instrumentation.StandardTags;
 import com.oracle.truffle.api.instrumentation.Tag;
-import com.oracle.truffle.api.source.SourceSection;
 import org.enso.interpreter.node.ClosureRootNode;
 import org.enso.interpreter.node.ExpressionNode;
 import org.enso.interpreter.runtime.tag.AvoidIdInstrumentationTag;
@@ -28,13 +27,13 @@ final class StatementNode extends ExpressionNode {
   }
 
   @Override
-  public SourceSection getSourceSection() {
+  public int[] getSourceSectionBounds() {
-    return node.getSourceSection();
+    return node.getSourceSectionBounds();
   }
 
   @Override
   public boolean isInstrumentable() {
-    return getSourceSection() != null && node.isInstrumentable();
+    return getSourceSectionBounds() != null && node.isInstrumentable();
   }
 
   @Override

engine/runtime/src/main/java/org/enso/interpreter/node/callable/resolver/HostMethodCallNode.java

@@ -1,5 +1,6 @@
 package org.enso.interpreter.node.callable.resolver;
 
+import com.oracle.truffle.api.CompilerDirectives;
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.Cached.Shared;
 import com.oracle.truffle.api.dsl.GenerateUncached;
@@ -213,25 +214,25 @@ public abstract class HostMethodCallNode extends Node {
       Object[] args,
       @Shared("interop") @CachedLibrary(limit = "LIB_LIMIT") InteropLibrary members,
       @Shared("hostValueToEnsoNode") @Cached HostValueToEnsoNode hostValueToEnsoNode) {
+    var ctx = EnsoContext.get(this);
     try {
       return hostValueToEnsoNode.execute(members.invokeMember(self, symbol, args));
     } catch (UnsupportedMessageException | UnknownIdentifierException e) {
-      throw new IllegalStateException(
+      CompilerDirectives.transferToInterpreter();
-          "Impossible to reach here. The member is checked to be invocable.");
+      var err = ctx.getBuiltins().error().makeNotInvokable(self);
+      throw new PanicException(err, e, this);
     } catch (ArityException e) {
-      throw new PanicException(
+      var err =
-          EnsoContext.get(this)
+          ctx.getBuiltins()
-              .getBuiltins()
               .error()
-              .makeArityError(e.getExpectedMinArity(), e.getExpectedMaxArity(), e.getActualArity()),
+              .makeArityError(e.getExpectedMinArity(), e.getExpectedMaxArity(), e.getActualArity());
-          this);
+      throw new PanicException(err, this);
     } catch (UnsupportedTypeException e) {
-      throw new PanicException(
+      var err =
-          EnsoContext.get(this)
+          ctx.getBuiltins()
-              .getBuiltins()
               .error()
-              .makeUnsupportedArgumentsError(e.getSuppliedValues(), e.getMessage()),
+              .makeUnsupportedArgumentsError(e.getSuppliedValues(), e.getMessage());
-          this);
+      throw new PanicException(err, this);
     }
   }
 
@@ -268,8 +269,10 @@ public abstract class HostMethodCallNode extends Node {
     try {
       return hostValueToEnsoNode.execute(instances.instantiate(self, args));
     } catch (UnsupportedMessageException e) {
-      throw new IllegalStateException(
+      CompilerDirectives.transferToInterpreter();
-          "Impossible to reach here. The member is checked to be instantiable.");
+      var ctx = EnsoContext.get(this);
+      var err = ctx.getBuiltins().error().makeNotInvokable(self);
+      throw new PanicException(err, e, this);
     } catch (ArityException e) {
       throw new PanicException(
           EnsoContext.get(this)

engine/runtime/src/main/java/org/enso/interpreter/node/expression/builtin/interop/java/AddToClassPathNode.java

@@ -25,10 +25,9 @@ public abstract class AddToClassPathNode extends Node {
   @CompilerDirectives.TruffleBoundary
   @Specialization
   Object doExecute(Object path, @Cached ExpectStringNode expectStringNode) {
-    EnsoContext context = EnsoContext.get(this);
+    var ctx = EnsoContext.get(this);
-    context
+    var file = ctx.getTruffleFile(new File(expectStringNode.execute(path)));
-        .getEnvironment()
+    ctx.addToClassPath(file);
-        .addToHostClassPath(context.getTruffleFile(new File(expectStringNode.execute(path))));
+    return ctx.getBuiltins().nothing();
-    return context.getBuiltins().nothing();
   }
 }

engine/runtime/src/main/java/org/enso/interpreter/node/expression/builtin/interop/java/LookupClassNode.java

@@ -1,5 +1,6 @@
 package org.enso.interpreter.node.expression.builtin.interop.java;
 
+import com.oracle.truffle.api.CompilerDirectives;
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.Specialization;
 import com.oracle.truffle.api.nodes.Node;
@@ -18,6 +19,7 @@ public abstract class LookupClassNode extends Node {
   }
 
   @Specialization
+  @CompilerDirectives.TruffleBoundary
   Object doExecute(Object name, @Cached("build()") ExpectStringNode expectStringNode) {
     return EnsoContext.get(this).lookupJavaClass(expectStringNode.execute(name));
   }

engine/runtime/src/main/java/org/enso/interpreter/node/expression/literal/PatchableLiteralNode.java

@@ -3,7 +3,6 @@ package org.enso.interpreter.node.expression.literal;
 import com.oracle.truffle.api.frame.VirtualFrame;
 import com.oracle.truffle.api.nodes.Node;
 import com.oracle.truffle.api.nodes.NodeInfo;
-import com.oracle.truffle.api.source.SourceSection;
 import java.util.function.Predicate;
 import org.enso.compiler.core.IR;
 import org.enso.compiler.core.ir.Expression;
@@ -51,8 +50,8 @@ final class PatchableLiteralNode extends ExpressionNode implements Patchable, Pr
   }
 
   @Override
-  public SourceSection getSourceSection() {
+  public int[] getSourceSectionBounds() {
-    return node.getSourceSection();
+    return node.getSourceSectionBounds();
   }
 
   @Override

engine/runtime/src/main/java/org/enso/interpreter/runtime/EnsoContext.java

@@ -13,6 +13,7 @@ import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.atomic.AtomicLong;
+import java.util.logging.Level;
 
 import org.enso.compiler.Compiler;
 import org.enso.compiler.PackageRepository;
@@ -48,11 +49,13 @@ import com.oracle.truffle.api.TruffleFile;
 import com.oracle.truffle.api.TruffleLanguage;
 import com.oracle.truffle.api.TruffleLanguage.Env;
 import com.oracle.truffle.api.TruffleLogger;
+import com.oracle.truffle.api.interop.InteropException;
 import com.oracle.truffle.api.interop.InteropLibrary;
 import com.oracle.truffle.api.interop.UnknownIdentifierException;
 import com.oracle.truffle.api.interop.UnsupportedMessageException;
 import com.oracle.truffle.api.nodes.Node;
 import com.oracle.truffle.api.object.Shape;
+import com.oracle.truffle.api.source.Source;
 
 import scala.jdk.javaapi.OptionConverters;
 
@@ -60,7 +63,7 @@ import scala.jdk.javaapi.OptionConverters;
  * The language context is the internal state of the language that is associated with each thread in
  * a running Enso program.
  */
-public class EnsoContext {
+public final class EnsoContext {
 
   private static final TruffleLanguage.ContextReference<EnsoContext> REFERENCE =
       TruffleLanguage.ContextReference.create(EnsoLanguage.class);
@@ -381,6 +384,27 @@ public class EnsoContext {
         .findFirst();
   }
 
+  /**
+   * Modifies the classpath to use to lookup {@code polyglot java} imports.
+   * @param file the file to register
+   */
+  @TruffleBoundary
+  public void addToClassPath(TruffleFile file) {
+    if (findGuestJava() == null) {
+      environment.addToHostClassPath(file);
+    } else {
+      try {
+        var path = new File(file.toUri()).getAbsoluteFile();
+        if (!path.exists()) {
+          throw new IllegalStateException("File not found " + path);
+        }
+        InteropLibrary.getUncached().invokeMember(findGuestJava(), "addPath", path.getPath());
+      } catch (InteropException ex) {
+        throw new IllegalStateException(ex);
+      }
+    }
+  }
+
   /**
    * Tries to lookup a Java class (host symbol in Truffle terminology) by its fully qualified name.
    * This method also tries to lookup inner classes. More specifically, if the provided name
@@ -399,18 +423,63 @@ public class EnsoContext {
       List<String> nestedClassPart =
           i < items.size() - 1 ? items.subList(i + 1, items.size()) : List.of();
       try {
-        Object hostSymbol = environment.lookupHostSymbol(pkgName + "." + curClassName);
+        var hostSymbol = lookupHostSymbol(pkgName, curClassName);
         if (nestedClassPart.isEmpty()) {
           return hostSymbol;
         } else {
-          return getNestedClass(hostSymbol, nestedClassPart);
+          var fullInnerClassName = curClassName + "$" + String.join("$", nestedClassPart);
+          return lookupHostSymbol(pkgName, fullInnerClassName);
         }
-      } catch (RuntimeException ignored) {
+      } catch (RuntimeException | InteropException ex) {
+        logger.log(Level.WARNING, null, ex);
       }
     }
     return null;
   }
 
+  private Object lookupHostSymbol(String pkgName, String curClassName)
+  throws UnknownIdentifierException, UnsupportedMessageException {
+    if (findGuestJava() == null) {
+      return environment.lookupHostSymbol(pkgName + "." + curClassName);
+    } else {
+      return InteropLibrary.getUncached().readMember(findGuestJava(), pkgName + "." + curClassName);
+    }
+  }
+
+  private Object guestJava = this;
+
+  @TruffleBoundary
+  private Object findGuestJava() throws IllegalStateException {
+    if (guestJava != this) {
+      return guestJava;
+    }
+    guestJava = null;
+    var envJava = System.getenv("ENSO_JAVA");
+    if (envJava == null) {
+      return guestJava;
+    }
+    if ("espresso".equals(envJava)) {
+      var src = Source.newBuilder("java", "<Bindings>", "getbindings.java").build();
+      try {
+        guestJava = environment.parsePublic(src).call();
+        logger.log(Level.SEVERE, "Using experimental Espresso support!");
+      } catch (Exception ex) {
+        if (ex.getMessage().contains("No language for id java found.")) {
+          logger.log(Level.SEVERE, "Environment variable ENSO_JAVA=" + envJava + ", but " + ex.getMessage());
+          logger.log(Level.SEVERE, "Use " + System.getProperty("java.home") + "/bin/gu install espresso");
+          logger.log(Level.SEVERE, "Continuing in regular Java mode");
+        } else {
+          var ise = new IllegalStateException(ex.getMessage());
+          ise.setStackTrace(ex.getStackTrace());
+          throw ise;
+        }
+      }
+    } else {
+      throw new IllegalStateException("Specify ENSO_JAVA=espresso to use Espresso. Was: " + envJava);
+    }
+    return guestJava;
+  }
+
   /**
    * Finds the package the provided module belongs to.
    *
@@ -605,30 +674,6 @@ public class EnsoContext {
     return notificationHandler;
   }
 
-  private Object getNestedClass(Object hostClass, List<String> nestedClassName) {
-    Object nestedClass = hostClass;
-    var interop = InteropLibrary.getUncached();
-    for (String name : nestedClassName) {
-      if (interop.isMemberReadable(nestedClass, name)) {
-        Object member;
-        try {
-          member = interop.readMember(nestedClass, name);
-        } catch (UnsupportedMessageException | UnknownIdentifierException e) {
-          throw new IllegalStateException(e);
-        }
-        assert member != null;
-        if (interop.isMetaObject(member)) {
-          nestedClass = member;
-        } else {
-          return null;
-        }
-      } else {
-        return null;
-      }
-    }
-    return nestedClass;
-  }
-
   private <T> T getOption(OptionKey<T> key) {
     var options = getEnvironment().getOptions();
     var safely = false;

engine/runtime/src/main/java/org/enso/interpreter/runtime/scope/DebugLocalScope.java

@@ -6,6 +6,7 @@ import com.oracle.truffle.api.frame.MaterializedFrame;
 import com.oracle.truffle.api.interop.InteropLibrary;
 import com.oracle.truffle.api.interop.UnknownIdentifierException;
 import com.oracle.truffle.api.interop.UnsupportedMessageException;
+import com.oracle.truffle.api.library.CachedLibrary;
 import com.oracle.truffle.api.library.ExportLibrary;
 import com.oracle.truffle.api.library.ExportMessage;
 import com.oracle.truffle.api.source.SourceSection;
@@ -77,11 +78,13 @@ public class DebugLocalScope implements EnsoObject {
             && this.bindingsByLevelsIdx < this.bindingsByLevels.size());
   }
 
+  @TruffleBoundary
   public static DebugLocalScope createFromFrame(EnsoRootNode rootNode, MaterializedFrame frame) {
     return new DebugLocalScope(
         rootNode, frame, gatherBindingsByLevels(rootNode.getLocalScope().flattenBindings()), 0);
   }
 
+  @TruffleBoundary
   private static DebugLocalScope createParent(DebugLocalScope childScope) {
     return new DebugLocalScope(
         childScope.rootNode,
@@ -137,6 +140,7 @@ public class DebugLocalScope implements EnsoObject {
 
   /** Returns the members from the current local scope and all the parent scopes. */
   @ExportMessage
+  @TruffleBoundary
   ScopeMembers getMembers(boolean includeInternal) {
     List<String> members = new ArrayList<>();
     bindingsByLevels.stream().skip(bindingsByLevelsIdx).forEach(members::addAll);
@@ -144,6 +148,7 @@ public class DebugLocalScope implements EnsoObject {
   }
 
   @ExportMessage
+  @TruffleBoundary
   boolean isMemberModifiable(String memberName) {
     return allBindings.containsKey(memberName);
   }
@@ -170,6 +175,7 @@ public class DebugLocalScope implements EnsoObject {
   }
 
   @ExportMessage
+  @TruffleBoundary
   boolean isMemberReadable(String memberName) {
     // When a value in a frame is null, it means that the corresponding
     // AssignmentNode was not run yet, and the slot kind of the
@@ -179,13 +185,15 @@ public class DebugLocalScope implements EnsoObject {
   }
 
   @ExportMessage
-  Object readMember(String member) {
+  @TruffleBoundary
+  Object readMember(String member, @CachedLibrary("this") InteropLibrary interop) {
     FramePointer framePtr = allBindings.get(member);
     var value = getValue(frame, framePtr);
     return value != null ? value : DataflowError.UNINITIALIZED;
   }
 
   @ExportMessage
+  @TruffleBoundary
   void writeMember(String member, Object value) throws UnknownIdentifierException {
     if (!allBindings.containsKey(member)) {
       throw UnknownIdentifierException.create(member);
@@ -225,6 +233,7 @@ public class DebugLocalScope implements EnsoObject {
   }
 
   @ExportMessage
+  @TruffleBoundary
   SourceSection getSourceLocation() {
     return rootNode.getSourceSection();
   }
@@ -236,6 +245,7 @@ public class DebugLocalScope implements EnsoObject {
   }
 
   @Override
+  @TruffleBoundary
   public String toString() {
     return String.format(
         "DebugLocalScope{rootNode = '%s', bindingsByLevels = %s, idx = %d}",

engine/runtime/src/main/scala/org/enso/interpreter/runtime/DefaultPackageRepository.scala

@@ -181,7 +181,7 @@ private class DefaultPackageRepository(
     isLibrary: Boolean
   ): Unit = {
     val extensions = pkg.listPolyglotExtensions("java")
-    extensions.foreach(context.getEnvironment.addToHostClassPath)
+    extensions.foreach(context.addToClassPath)
 
     val (regularModules, syntheticModulesMetadata) = pkg
       .listSources()

project/NativeImage.scala

@@ -101,6 +101,12 @@ object NativeImage {
           "because Native Image component was not found."
         )
       }
+      if (additionalOptions.contains("--language:java")) {
+        log.warn(
+          s"Building ${artifactName} image with experimental Espresso support!"
+        )
+
+      }
 
       val debugParameters =
         if (includeDebugInfo) Seq("-H:GenerateDebugInfo=1") else Seq()

test/Tests/src/Data/Time/Time_Zone_Spec.enso

@@ -6,7 +6,6 @@ import Standard.Test.Extensions
 
 polyglot java import java.time.ZoneId
 polyglot java import java.time.ZoneOffset
-polyglot java import java.time.ZoneRegion
 
 spec =
     Test.group "Zone" <|