How can i use multiline ??

[JooyoungJeong]

how can i use multiline ??

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@test@ FATAL io.robustperception.java_examples.JavaSimple$ExampleServlet Fatal : You chose a number > 100 java.lang.NullPointerException: NullError at io.robustperception.java_examples.JavaSimple$ExampleServlet.doGet(JavaSimple.java:35) at javax.servlet.http.HttpServlet.service(HttpServlet.java:735) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:648) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:365) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:627) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:51) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)

[errm]

This plugin does not support multiline... see https://github.com/reevoo/fluent-plugin-systemd/issues/11

If you are interested on working on this... I am happy to accept a PR... But I have no interest in implementing it myself :)

[Jitsusama]

@JooyoungJeong; multiline log handling can be handled before this plugin receives the event record. Common ways of handling this is via the concat filter plugin. I've used this myself with great success.

[errm]

I have not tried but it does seem that systemd might support log entries with newlines in them... If this works then this plugin should read them correctly without any further configuration ... I will try to make this work and report back

[Jitsusama]

@errm; that works for events sent to systemd as a single event, but more often than not, particularly in the case of Docker when it's configured to use systemd as its log-driver, they are sent to systemd as a separate event per log line. This is something I know all too well from my own personal experience.

[errm]

I guess the other option would be to configure your applications logger to escape the newlines ... This guy has some examples about doing it in Java https://fabianlee.org/2018/03/09/java-collapsing-multiline-stack-traces-into-a-single-log-event-using-spring-backed-by-logback-or-log4j2/

[JooyoungJeong]

Thank you for reply. The form of exception error is not fixed(each language). So I redefined log pattern in application. I use log4j2 and i defined pattern as follows.
"exception":"%replace{%xEx}{\n|\tat}{ }"

[errm]

Sounds good... I will mention these two strategies in the docs... It does seem where the application is using a logger that can be configured the best option is to replace the newlines in each message to keep them as one systemd entry ...