连接到托管线程中的数据库，调试值未出现在Tomcat控制台或日志中

Question

I am facing this trouble for a long time now without accessing the debug logs of the managed Threads in my Spring boot application when run on Tomcat. All the logs appear when run on the Eclipse/STS.

In Tomcat logs, I can only see the main Tread Logs.

I am connection to a database through JDBC and this is happening in a separate thread. I tried to follow the log configuration documentation but none of them helps to get the debug logs of these threads. So I do not actually see the exact problem of what is causing the connection to fail.

Here is what I tried so far:

1. I tried with the following logback.xml

    <?xml version="1.0" encoding="UTF-8"?> <configuration> <!-- <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender"> <Target>System.out</Target> <encoder> <pattern>%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n</pattern> </encoder> </appender> <logger name="com.biscoind" additivity="false" level="TRACE"> <appender-ref ref="stdout" /> </logger> <root level="debug"> <appender-ref ref="stdout" /> </root> --> <include resource="org/springframework/boot/logging/logback/base.xml" /> <logger name="org.springframework.web" level="DEBUG" /> </configuration> 

2. When that did not resolve the issue I removed this file and see if by default, if it logs all the treads. But it did not.

3. So, I added the following configurations to the application.properties

    logging.level.org.springframework.web:TRACE logging.level.org.hibernate:ERROR 

   Then It seemed to me that this is only logging out the above namespaces, I again added

    debug=true logging.level.org.springframework.web:DEBUG logging.level.org.hibernate:DEBUG 

   Tried and it did not work.

4. I added my namespaces also and tried as follwing,

    debug=true logging.level.com.mydomain:DEBUG logging.level.org.springframework.web:DEBUG logging.level.org.hibernate:DEBUG 

That did not work also, I am now confused on the what should I do with the config relative to logging to make the logs to appear for the tread executions.

Irrespective of the treads, because of the property spring.jpa.show-sql=true it logs the queries that are made.

Answer 1

It was not a problem with the threads at all. The application was working correctly in the development environment. The problem was in the deployment environment.

It turned out to be a Java version miss-match with the jar files and the JVM version. The jars were build using Java 8 and it was running on Java 7 JVM.

When the JMV was changed to Java-8. It worked fine. So Next time I will be more careful with the version mismatch.