Try with the relative path using *
@ContextConfiguration(locations = {
"classpath*:spring/applicationContext.xml",
"classpath*:spring/applicationContext-jpa.xml",
"classpath*:spring/applicationContext-security.xml" })
If not look if your xml are really on resources/spring/.
Finally try just on without location
@ContextConfiguration({"classpath*:spring/applicationContext.xml"})
The other error that you´re showing is because you have this tag duplicated on applicationContext.xml and applicationContext-security.xml
Duplicate <global-method-security>