找出Spring Logging

Question

I've inherited a, well, messy, Spring MVC application. Some things don't work and I want to enable DEBUG or even TRACE logging to get more information and found that even that is not that simple.

When starting the application (by running a Tomcat 8 server from Eclipse), it seems to output two kinds of log messages. Here is an example of the first kind:

Jun 20, 2017 1:47:07 PM org.hibernate.Version logVersion INFO:
HHH000412: Hibernate Core {4.3.8.Final} Jun 20, 2017 1:47:07 PM
org.hibernate.cfg.Environment <clinit> INFO: HHH000206:
hibernate.properties not found Jun 20, 2017 1:47:07 PM
org.hibernate.cfg.Environment buildBytecodeProvider INFO: HHH000021:
Bytecode provider name : javassist

These messages are all in red. The second kind looks like this:

13:47:16.949 [localhost-startStop-1] INFO  org.springframework.web.servlet.DispatcherServlet:489 - FrameworkServlet 'spring': initialization started
13:47:16.952 [localhost-startStop-1] INFO  org.springframework.web.context.support.XmlWebApplicationContext:583 - Refreshing WebApplicationContext for namespace 'spring-servlet': startup date [Tue Jun 20 13:47:16 IDT 2017]; parent: Root WebApplicationContext
13:47:16.952 [localhost-startStop-1] INFO  org.springframework.beans.factory.xml.XmlBeanDefinitionReader:317 - Loading XML bean definitions from ServletContext resource [/WEB-INF/spring-servlet.xml]

These are all in black.

Obviously there are at least two active logging formats. This is were it gets weird:

I found numerous log4j2.xml as well as log4j.properties files. All of them seem to be ignored. Changing them makes no difference. I just deleted them all, and it did not affect the logging output. In addition, log4j 1.2, log4j 2.0.2 and slf4j are all Maven dependencies. pom.xml references version 1.2, other Maven dependencies probably need the other versions.

My question is - how do I configure the logging myself? Placing a log4j.xml file under WEB-INF (were all other property files are located) doesn't make any difference. Neither that placing a log4j.properties file there. I need to somehow turn debug printouts of log4j itself, so I can figure out where it's reading it's configuration from.

I tried adding -Dlog4j.debug as a VM argument to the Tomcat run configuarion. Other than printing -Dlog4j.debug command line argument or something similar, nothing changed.

Answer 1

You can use following code snippet that I have used for my project. Over here class name is FolderReader.class and placed lo4j.properties file in folder "conf".Passing argument "../conf/log4j.properties" as args[2] argument when running the application.

final FileSystemXmlApplicationContext applicationContext = new FileSystemXmlApplicationContext(args[0]);
    Logger logger=Logger.getLogger(FolderReader.class);
    PropertyConfigurator.configure(args[2]);
    logger.info("Intializing beans..");
    ServiceContext serviceContext = (ServiceContext) BeanFactoryLocator.getBean("serviceContext");

PropertyConfigurator.configure(args[2]);loads the log4j.properties file from location. Configuration is taken from this property file and formatting is done accordingly.