Cannot instantiate interface org.springframework.context.ApplicationListener after adding spring-security-oauth2

Having fixed the problems with the example's pom, I can now see the complete stack trace of the failure:

Exception in thread "main" java.lang.IllegalArgumentException: Cannot instantiate interface org.springframework.context.ApplicationListener : org.springframework.boot.context.logging.ClasspathLoggingApplicationListener
    at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:439)
    at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:418)
    at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:409)
    at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:268)
    at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:247)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1245)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1233)
    at mahlzeit.api.Application.main(Application.java:14)
Caused by: java.lang.NoClassDefFoundError: org/springframework/context/event/GenericApplicationListener
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.springframework.util.ClassUtils.forName(ClassUtils.java:255)
    at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:431)
    ... 7 more
Caused by: java.lang.ClassNotFoundException: org.springframework.context.event.GenericApplicationListener
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 21 more

The root cause of the problem is that org.springframework.context.event.GenericApplicationListener isn't on the classpath. This class is part of the spring-context module and is new in Spring Framework 4.2.

Looking at the pom, you're not using Boot's dependency management (either by importing the spring-boot-dependencies bom or by using spring-boot-starter-parent as your project's parent. This means that the versions of any transitive dependencies aren't being managed. That's causing the problem here as your project is using 4.0.9.RELEASE of spring-context transitively via spring-security-oauth2.

I would strongly recommend that you use Spring Boot's dependency management. If you don't want to do that or can't do that for some unstated reason, you will have to manually ensure that all transitive dependencies have supported versions.