Added a test infrastructure that simulates eclipse with diet-parse, type-binding and so forth. Similar to eclipse, the test needs to be executed with lombok as vm-agent. @Delegate runs with this setup, sadly val does not, at least for now.

And as expected the tests shows that @Synchronized and @SneakyThrows are currently broken for eclipse but not for ecj.

test/transform/resource/after-eclipse/SneakyThrowsMultiple.java

@@ -0,0 +1,63 @@
+import java.awt.AWTException;
+import java.io.IOException;
+import java.util.Random;
+class SneakyThrowsMultiple {
+  SneakyThrowsMultiple() {
+    super();
+  }
+  public @lombok.SneakyThrows({IOException.class, Throwable.class}) void test() {
+    try 
+      {
+        try 
+          {
+            System.out.println("test1");
+            throw new IOException();
+          }
+        catch (final IOException $ex)           {
+            throw lombok.Lombok.sneakyThrow($ex);
+          }
+      }
+    catch (final Throwable $ex)       {
+        throw lombok.Lombok.sneakyThrow($ex);
+      }
+  }
+  public @lombok.SneakyThrows({AWTException.class, IOException.class}) void test2() {
+    try 
+      {
+        try 
+          {
+            System.out.println("test2");
+            if (new Random().nextBoolean())
+                {
+                  throw new IOException();
+                }
+            else
+                {
+                  throw new AWTException("WHAT");
+                }
+          }
+        catch (final AWTException $ex)           {
+            throw lombok.Lombok.sneakyThrow($ex);
+          }
+      }
+    catch (final IOException $ex)       {
+        throw lombok.Lombok.sneakyThrow($ex);
+      }
+  }
+  public @lombok.SneakyThrows(value = {IOException.class, Throwable.class}) void test3() {
+    try 
+      {
+        try 
+          {
+            System.out.println("test3");
+            throw new IOException();
+          }
+        catch (final IOException $ex)           {
+            throw lombok.Lombok.sneakyThrow($ex);
+          }
+      }
+    catch (final Throwable $ex)       {
+        throw lombok.Lombok.sneakyThrow($ex);
+      }
+  }
+}