There was a bug in the annotation builder for javac, which would trigger exceptions anytime you used a lombok annotation in implicit-value-parameter form (e.g: @Cleanup("release") instead of @Cleanup or @Cleanup(value="release").

Fixes issue #14

src/lombok/javac/HandlerLibrary.java

@@ -146,6 +146,7 @@ public class HandlerLibrary {
 	/** Generates an error in the Messager that was used to initialize this HandlerLibrary. */
 	public void javacError(String message, Throwable t) {
 		messager.printMessage(Diagnostic.Kind.ERROR, message + (t == null ? "" : (": " + t)));
+		if ( t != null ) t.printStackTrace();
 	}
 	
 	/**
@@ -180,7 +181,9 @@ public class HandlerLibrary {
 			} catch ( AnnotationValueDecodeFail fail ) {
 				fail.owner.setError(fail.getMessage(), fail.idx);
 			} catch ( Throwable t ) {
-				javacError(String.format("Lombok annotation handler %s failed", container.handler.getClass()), t);
+				String sourceName = "(unknown).java";
+				if ( unit != null && unit.sourcefile != null ) sourceName = unit.sourcefile.getName();
+				javacError(String.format("Lombok annotation handler %s failed on " + sourceName, container.handler.getClass()), t);
 			}
 		}
 		

src/lombok/javac/Javac.java

@@ -94,10 +94,19 @@ public class Javac {
 			final List<DiagnosticPosition> positions = new ArrayList<DiagnosticPosition>();
 			
 			for ( JCExpression arg : arguments ) {
-				JCAssign assign = (JCAssign) arg;
-				String mName = assign.lhs.toString();
+				String mName;
+				JCExpression rhs;
+				
+				if ( arg instanceof JCAssign ) {
+					JCAssign assign = (JCAssign) arg;
+					mName = assign.lhs.toString();
+					rhs = assign.rhs;
+				} else {
+					rhs = arg;
+					mName = "value";
+				}
+				
 				if ( !mName.equals(name) ) continue;
-				JCExpression rhs = assign.rhs;
 				if ( rhs instanceof JCNewArray ) {
 					List<JCExpression> elems = ((JCNewArray)rhs).elems;
 					for  ( JCExpression inner : elems ) {