[jira] [Created] (LOG4J2-2167) Memory leak in Apache Tomcat/8.5.24

["Christian Salway (JIRA)" <ji...@apache.org>]

Christian Salway created LOG4J2-2167:
----------------------------------------

             Summary: Memory leak in Apache Tomcat/8.5.24
                 Key: LOG4J2-2167
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2167
             Project: Log4j 2
          Issue Type: Bug
          Components: Web/Servlet
    Affects Versions: 2.10.0
         Environment: OS (on AWS): ubuntu-xenial-16.04-amd64-server-20171121.1 (ami-fcc4db98)
Server version:        Apache Tomcat/8.5.24
Server built:          Nov 27 2017 13:05:30 UTC
Server number:         8.5.24.0
JVM Version:           1.8.0_151-b12
JVM Vendor:            Oracle Corporation
            Reporter: Christian Salway


I'm introducing log4j2 as the logger into my application and when I do that, on a reload, undeploy or stop of the Tomcat server, a memory leak is left, which only happens once I introduce the logger into the code.

{noformat}
The following web applications were stopped (reloaded, undeployed), but their
classes from previous runs are still loaded in memory, thus causing a memory
leak (use a profiler to confirm):
/myapp

My log4j2.xml:

{code:xml}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
    <Appenders>
        <Console name="Console">
            <PatternLayout pattern="%d %p [%c] %m%n" />
        </Console>
        <File name="File" bufferedIO="true" fileName="logs/log4j2-file-sync-${date:HH:mm:ss.SSS}.log">
            <PatternLayout pattern="%d %p %m%n" />
        </File>
    </Appenders>
    <Loggers>
        <Root level="all" includeLocation="false">
            <AppenderRef ref="Console" />
            <AppenderRef ref="File" />
        </Root>
    </Loggers>
</Configuration>
{code}

My dependencies in pom.xml:

{code:xml}
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.10.0</version>
</dependency>
<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-core</artifactId>
    <version>2.10.0</version>
</dependency>
{code}


My WebServlet:

{code:java}
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "Servlet", urlPatterns = {"/servlet"}, loadOnStartup = 1)
public class Servlet extends HttpServlet {

    private final Logger logger = LogManager.getLogger(Servlet.class);

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        logger.info("doGet");

        PrintWriter out = response.getWriter();
        out.print("Servlet loaded");
        out.flush();
        out.close();
    }
}
{code}




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