Do not check for active user count. Check response content type.

The context:property-placeholder config element does not work as
intended. See https://jira.spring.io/browse/SPR-9989.

Paul-Christian Volkmer authored 10 years ago and Daniel Gerhardt committed 10 years ago

Set default evaluation result to false and throw an AccessDeniedException.
SecurityExceptionControllerAdvice checks if there is an valid login and
decides whether to send HTTP 401 or HTTP 403.

Conflicts:
	src/test/java/de/thm/arsnova/controller/AbstractControllerTest.java

Daniel Gerhardt authored 10 years ago and Daniel Gerhardt committed 10 years ago

While the context can be started without errors the is still a
configuration problem. Authentication filters are causing a
StackOverflowException.

Conflicts:
	pom.xml
	src/main/java/de/thm/arsnova/controller/LoginController.java
	src/main/java/de/thm/arsnova/dao/CouchDBDao.java
	src/main/java/de/thm/arsnova/services/SessionService.java
	src/main/java/de/thm/arsnova/services/StatisticsService.java
	src/main/java/de/thm/arsnova/socket/ARSnovaSocketIOServer.java
	src/main/webapp/WEB-INF/spring/arsnova-servlet.xml
	src/main/webapp/WEB-INF/spring/spring-main.xml
	src/main/webapp/WEB-INF/spring/spring-security.xml
	src/main/webapp/arsnova.properties.example
	src/test/resources/arsnova.properties.example

Replaced the use of Json-lib for deserialization by the use of a Map.
This fixes exceptions caused by failed deserializations and is more
consistent with JSON handling of other controllers.
Log messages for easier debugging have been added.