davs | DDoS Attack Visualization System | TCP library

While playing with Google Calendar and CalDav i realized that if for a given event you modify a notification (Alarm), the event's ETag won't change.

Now, comparing ETags is essential to find out when a given event changes (in CalDav).

The request i am using to find out the ETag is

This is similar to 403 CalDAV error: valid-calendar-object-resource except that the trivial solution (adding the UID to the URL) was already implemented. I'm receiving '403 Forbidden' from the iCloud CalDAV server for one specific user account. I can pull the list of calendars and the events on the calendars, but can't create or modify events.

Here's a working example:

I develop an app in java that loads a C++ shared library using JNA. The detailed procedure is the following.

1. Find library in the jar
2. use System.load( C_LIBRARY_PATH ) with the result of step 1
3. Load library using JNA tools: Wrapper INSTANCE = Native.loadLibrary( C_LIBRARY_PATH, Wrapper.class );

This procedure is used to create a wrapper of the c++ library and hence produces a java library that is used for other projects. Point 1 and 2 are inspired by the work of adamheinrich. The existence of the file is checked before calling the load function.

When using the java wrapper in a project I randomly have an error like below. Could you guide me in debugging and try to control this random failure?