H2 supports 'true' and 'false' boolean literals

hibernate-core/src/main/java/org/hibernate/dialect/H2Dialect.java

@@ -183,6 +183,11 @@ public class H2Dialect extends Dialect {
 		return "datediff(?1, ?2, ?3)";
 	}
 
+	@Override
+	public String toBooleanValueString(boolean bool) {
+		return String.valueOf( bool );
+	}
+
 	@Override
 	public LimitHandler getLimitHandler() {
 		return limitHandler;