Spring server doesn't start with actuator dependency - spring-boot

Question

If I add spring boot actuator dependency my server doesn't start. I get the following error:
SEVERE [main] org.apache.catalina.startup.HostConfig.deployDescriptor Error deploying deployment descriptor [tomcat path\conf\Catalina\localhost\test.xml]
java.lang.IllegalStateException: Error starting child
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:720)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:692)
...
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/agromarket]]
at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717)
... 37 more
Caused by: java.lang.ClassCastException: org.apache.logging.slf4j.SLF4JLoggerContext cannot be cast to org.apache.logging.log4j.core.LoggerContext
at rs.navigator.alexandar.sync.WebAppInitializer.onStartup(WebAppInitializer.java:34)
at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:174)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
Dependency:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
Any ideas why? From my knowledge even if the versions aren't compatible the server should still be able to start.
Edit:
My WebAppInitializer:
public class WebAppInitializer implements WebApplicationInitializer {
public void onStartup(ServletContext servletContext) throws ServletException {
System.out.println(("------------------ Sync context initialized and application started ------------------"));
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
// ctx.register(ServletContextListener.class);
// ctx.register(SecurityConfiguration.class);
// ctx.register(SpringFoxConfig.class);
// ctx.register(WebMvcConfigure.class);
// ctx.register(JPAConfiguration.class);
// ctx.setServletContext(servletContext);
// Reconfigure log4j
// ServletContext sctx = ctx.getServletContext();
System.setProperty("logFilename", servletContext.getContextPath().substring(1));
org.apache.logging.log4j.core.LoggerContext sctxLog =
(org.apache.logging.log4j.core.LoggerContext) LogManager.getContext(false);
sctxLog.reconfigure();
//Dispatcher servlet
ServletRegistration.Dynamic servlet = servletContext.addServlet("mvc-dispatcher", new DispatcherServlet(ctx));
servlet.setLoadOnStartup(1);
servlet.addMapping("/");
ctx.close();
}
}
Error stack after adding #EnableAutoConfiguration

Answer 1

If you want benefit from the automatic features of Spring Boot, your #Configuration class must be annotated with #EnableAutoConfiguration.
Since the auto-configuration already creates a DispatcherServlet bound to /, you can safely change your WebAppInitializer class to:
#SpringBootApplication
public class WebAppInitializer extends SpringBootServletInitializer {
}