Spring boot 1.5.2 - web application stops after loading logo?

Question

I have a very weird problem with Spring Boot, I don't know why the web application which using Spring Boot cannot start and it has no output error even when I run it directly on the terminal.

java -jar /var/lib/tomcat/webapps/rasdaman.war
log4j:WARN No appenders could be found for logger (org.springframework.web.context.support.StandardServletEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

. ____ _ __ _ _
/\ / ' __ _ () __ __ _ \ \ \ 
( ( )__ | '_ | '| | ' / ` | \ \ \ 
\/ )| |)| | | | | || (| | ) ) ) )
' || .__|| ||| |_, | / / / /
=========||==============|/=////
:: Spring Boot :: (v1.5.2.RELEASE)

[rasdaman@osboxes rasdaman]$ echo $?
1

Here is the application class https://pastebin.com/rinWbp9z, this web application uses Liquibase to populate database schema and Spring boot version 1.5.2. Can you please share some hint to debug?

Answer 1

So, the problem is, I'm using log4.properties out of war file. Then, when I starts this war, It shows very nice information like this:

java -jar target/petascope_main/rasdaman.war
log4j:WARN No appenders could be found for logger (org.springframework.web.context.support.StandardServletEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.2.RELEASE)

Aug 28, 2017 6:00:31 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Tomcat
Aug 28, 2017 6:00:32 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/8.5.11
Aug 28, 2017 6:00:33 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring embedded WebApplicationContext
Aug 28, 2017 6:00:38 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Tomcat

Then, I added a log4j.properties file in src/main/resources with this content:

log4j.rootLogger=debug, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%t %-5p %c{2} - %m%n

After that, I can see the detail log from Spring which make Tomcat stop:

***************************
APPLICATION FAILED TO START
***************************

Description:

Field abstractHandler in org.rasdaman.ApplicationMain required a single bean, but 7 were found:
    - KVPRasqlServiceHandler: defined in URL [jar:file:/home/rasdaman/build/applications/petascope/target/petascope_main/rasdaman.war!/WEB-INF/classes!/petascope/controller/handler/service/KVPRasqlServiceHandler.class]
    - KVPWCPSServiceHandler: defined in URL [jar:file:/home/rasdaman/build/applications/petascope/target/petascope_main/rasdaman.war!/WEB-INF/classes!/petascope/controller/handler/service/KVPWCPSServiceHandler.class]
    - SOAPWCSServiceHandler: defined in URL [jar:file:/home/rasdaman/build/applications/petascope/target/petascope_main/rasdaman.war!/WEB-INF/classes!/petascope/controller/handler/service/SOAPWCSServiceHandler.class]
    - KVPWCSTServiceHandler: defined in URL [jar:file:/home/rasdaman/build/applications/petascope/target/petascope_main/rasdaman.war!/WEB-INF/classes!/petascope/controller/handler/service/KVPWCSTServiceHandler.class]
    - XMLWCSServiceHandler: defined in URL [jar:file:/home/rasdaman/build/applications/petascope/target/petascope_main/rasdaman.war!/WEB-INF/classes!/petascope/controller/handler/service/XMLWCSServiceHandler.class]
    - KVPWCSServiceHandler: defined in URL [jar:file:/home/rasdaman/build/applications/petascope/target/petascope_main/rasdaman.war!/WEB-INF/classes!/petascope/controller/handler/service/KVPWCSServiceHandler.class]
    - KVPWMSServiceHandler: defined in URL [jar:file:/home/rasdaman/build/applications/petascope/target/petascope_main/rasdaman.war!/WEB-INF/classes!/petascope/controller/handler/service/KVPWMSServiceHandler.class]


Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

Well, I must say, it is really impressive about how error could be hidden.