diff --git a/build.gradle b/build.gradle
index d222a18..863e3d7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ plugins {
 }
 
 group 'com.docutools'
-version = '4.2.0'
+version = '4.2.1'
 
 java {
     toolchain {
diff --git a/src/main/java/com/docutools/jocument/PlaceholderData.java b/src/main/java/com/docutools/jocument/PlaceholderData.java
index 1c7e972..8e7ff3d 100644
--- a/src/main/java/com/docutools/jocument/PlaceholderData.java
+++ b/src/main/java/com/docutools/jocument/PlaceholderData.java
@@ -30,7 +30,7 @@ public interface PlaceholderData {
    * @return stream of {@link com.docutools.jocument.PlaceholderResolver}s
    */
   default Stream<PlaceholderResolver> stream() {
-    throw new UnsupportedOperationException();
+    throw new UnsupportedOperationException(this.getClass().toString());
   }
 
   /**
@@ -41,7 +41,7 @@ default Stream<PlaceholderResolver> stream() {
    * @return count of {@link com.docutools.jocument.PlaceholderResolver}s
    */
   default long count() {
-    throw new UnsupportedOperationException();
+    throw new UnsupportedOperationException(this.getClass().toString());
   }
 
   /**
@@ -54,7 +54,7 @@ default long count() {
    * @param options the {@link GenerationOptions}
    */
   default void transform(Object placeholder, Locale locale, GenerationOptions options) {
-    throw new UnsupportedOperationException();
+    throw new UnsupportedOperationException(this.getClass().toString());
   }
 
   /**
@@ -63,7 +63,7 @@ default void transform(Object placeholder, Locale locale, GenerationOptions opti
    * @return the raw value
    */
   default Object getRawValue() {
-    throw new UnsupportedOperationException();
+    throw new UnsupportedOperationException(this.getClass().toString());
   }
 
   /**