java - Spring boot 1.5.2 - 加载 Logo 后 Web 应用程序停止？

Question

我在使用Spring Boot时遇到了一个很奇怪的问题，我不知道为什么使用Spring Boot的Web应用程序无法启动，即使我直接在终端上运行也没有输出错误。

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

这里是应用类https://pastebin.com/rinWbp9z ，此 Web 应用程序使用 Liquibase 填充数据库模式和 Spring boot version 1.5.2。你能分享一些调试提示吗？

Answer 1

所以，问题是，我在 war 文件中使用 log4.properties。然后，当我开始这场 war 时，它会显示非常好这样的信息:

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

然后，我在 src/main/resources 中添加了一个 log4j.properties 文件，内容如下:

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

之后，我可以看到来自 Spring 的使 Tomcat 停止的详细日志:

***************************
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

嗯，我必须说，隐藏错误的方式确实令人印象深刻。