diff --git a/gson/src/main/java/com/google/gson/internal/Excluder.java b/gson/src/main/java/com/google/gson/internal/Excluder.java
index 1c71e3e7..bef79040 100644
--- a/gson/src/main/java/com/google/gson/internal/Excluder.java
+++ b/gson/src/main/java/com/google/gson/internal/Excluder.java
@@ -62,7 +62,7 @@ public final class Excluder implements TypeAdapterFactory, Cloneable {
     try {
       return (Excluder) super.clone();
     } catch (CloneNotSupportedException e) {
-      throw new AssertionError();
+      throw new AssertionError(e);
     }
   }
 
diff --git a/gson/src/main/java/com/google/gson/internal/bind/ReflectiveTypeAdapterFactory.java b/gson/src/main/java/com/google/gson/internal/bind/ReflectiveTypeAdapterFactory.java
index b954b017..960153aa 100644
--- a/gson/src/main/java/com/google/gson/internal/bind/ReflectiveTypeAdapterFactory.java
+++ b/gson/src/main/java/com/google/gson/internal/bind/ReflectiveTypeAdapterFactory.java
@@ -241,7 +241,7 @@ public final class ReflectiveTypeAdapterFactory implements TypeAdapterFactory {
           }
         }
       } catch (IllegalAccessException e) {
-        throw new AssertionError();
+        throw new AssertionError(e);
       }
       out.endObject();
     }
diff --git a/gson/src/main/java/com/google/gson/internal/bind/TypeAdapters.java b/gson/src/main/java/com/google/gson/internal/bind/TypeAdapters.java
index d284dd5b..c72c0d9a 100644
--- a/gson/src/main/java/com/google/gson/internal/bind/TypeAdapters.java
+++ b/gson/src/main/java/com/google/gson/internal/bind/TypeAdapters.java
@@ -796,7 +796,7 @@ public final class TypeAdapters {
           constantToName.put(constant, name);
         }
       } catch (NoSuchFieldException e) {
-        throw new AssertionError();
+        throw new AssertionError("Missing field in " + classOfT.getName(), e);
       }
     }
     @Override public T read(JsonReader in) throws IOException {