Spring Boot 1.0.0-RC4 starts with multiple EmbeddedServletContainerFactory instances - spring

Question

I am looking to override the default EmbeddedServletContainerFactory as documented here in order to set up SSL. The old docs (from RC1 days) said to override the Customizer and that worked great until I upgraded today, changed the implementation to follow the new convention.
#Configuration
public class ContainerConfig {
#Bean
public EmbeddedServletContainerFactory servletContainer() {
TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory();
factory.addConnectorCustomizers(new TomcatConnectorCustomizer() {
#Override
public void customize(Connector connector) {
connector.setPort(8443);
connector.setSecure(true);
connector.setScheme("https");
connector.setAttribute("keyAlias", "tomcat");
connector.setAttribute("keystorePass", "changeit");
try {
connector.setAttribute("keystoreFile", ResourceUtils.getFile("src/ssl/tomcat.keystore").getAbsolutePath());
} catch (FileNotFoundException e) {
throw new IllegalStateException("Cannot load keystore", e);
}
connector.setAttribute("clientAuth", "false");
connector.setAttribute("sslProtocol", "TLS");
connector.setAttribute("SSLEnabled", true);
}
});
factory.setSessionTimeout(10, TimeUnit.MINUTES);
return factory;
}
The source code in Boot (EmbeddedServletContainerAutoConfiguration) indicates that if it does find my bean, it will not register the default:
#ConditionalOnMissingBean(value = EmbeddedServletContainerFactory.class, search = SearchStrategy.CURRENT)
However it appears to register anyhow. Does anybody else have this working? Here is the stack:
Exception in thread "main"
org.springframework.context.ApplicationContextException: Unable to
start embedded container; nested exception is
org.springframework.context.ApplicationContextException: Unable to
start EmbeddedWebApplicationContext due to multiple
EmbeddedServletContainerFactory beans :
servletContainer,tomcatEmbeddedServletContainerFactory at
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:135)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:476)
at
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:120)
at
org.springframework.boot.SpringApplication.refresh(SpringApplication.java:619)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:880)
at
org.springframework.boot.SpringApplication.run(SpringApplication.java:869)
at
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606) at
com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: org.springframework.context.ApplicationContextException:
Unable to start EmbeddedWebApplicationContext due to multiple
EmbeddedServletContainerFactory beans :
servletContainer,tomcatEmbeddedServletContainerFactory at
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:190)
at
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:158)
at
org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:132)
... 12 more
I have created a GitHub repo that mashes up the Tomcat and Websocket samples from the Spring Boot project, and applies this configuration.

Answer 1

This is a (sort of) bug (https://github.com/spring-projects/spring-boot/issues/479). Fixed now. Workaround is to use EmbeddedServletContainerCustomizer instead of EmbeddedServletContainerFactory (like in the docs link in the original question).