Adwait Kumar Singh created LOG4J2-2720:
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Summary: TestAppender based on MutableLogEvent stop working in
Log4j2.11
Key: LOG4J2-2720
URL: https://issues.apache.org/jira/browse/LOG4J2-2720
Project: Log4j 2
Issue Type: Question
Affects Versions: 2.11.2
Environment: JDK 11, Log4J-2.11.2
Reporter: Adwait Kumar Singh
Fix For: 2.8
I have written unit tests on Logs by creating a custom appender
{color:#000080}import {color}java.io.Serializable;
{color:#000080}import {color}java.util.ArrayList;
{color:#000080}import {color}java.util.List;
{color:#000080}import {color}org.apache.logging.log4j.core.Filter;
{color:#000080}import {color}org.apache.logging.log4j.core.Layout;
{color:#000080}import {color}org.apache.logging.log4j.core.LogEvent;
{color:#000080}import
{color}org.apache.logging.log4j.core.appender.AbstractAppender;
{color:#000080}import
{color}org.apache.logging.log4j.core.config.plugins.{color:#808000}Plugin{color};
{color:#000080}import
{color}org.apache.logging.log4j.core.config.plugins.{color:#808000}PluginAttribute{color};
{color:#000080}import
{color}org.apache.logging.log4j.core.config.plugins.{color:#808000}PluginElement{color};
{color:#000080}import
{color}org.apache.logging.log4j.core.config.plugins.{color:#808000}PluginFactory{color};
{color:#000080}import {color}org.apache.logging.log4j.core.impl.MutableLogEvent;
{color:#000080}import {color}org.apache.logging.log4j.core.layout.PatternLayout;
{color:#808000}@Plugin{color}(name = {color:#008000}"TestAppender"{color},
category = {color:#008000}"Core"{color}, elementType =
{color:#008000}"appender"{color}, printObject = {color:#000080}true{color})
{color:#000080}public class {color}TestAppender {color:#000080}extends
{color}AbstractAppender {
{color:#000080}private {color}List<String> {color:#660e7a}messages {color}=
{color:#000080}new {color}ArrayList<>();
TestAppender(String name, Filter filter, Layout<? {color:#000080}extends
{color}Serializable> layout) {
{color:#000080}super{color}(name, filter, layout);
}
{color:#808000}@Override
{color} {color:#000080}public void {color}append(LogEvent event) {
getMessages().add(((MutableLogEvent) (event)).getFormattedMessage());
}
{color:#808000}@PluginFactory
{color} {color:#000080}public static {color}TestAppender createAppender(
{color:#808000}@PluginAttribute{color}({color:#008000}"name"{color}) String
name,
{color:#808000}@PluginElement{color}({color:#008000}"Layout"{color}) Layout<?
{color:#000080}extends {color}Serializable> layout,
{color:#808000}@PluginElement{color}({color:#008000}"Filter"{color})
{color:#000080}final {color}Filter filter,
{color:#808000}@PluginAttribute{color}({color:#008000}"otherAttribute"{color})
String otherAttribute) {
{color:#000080}if {color}(name == {color:#000080}null{color}) {
{color:#660e7a}LOGGER{color}.error({color:#008000}"No name provided for
TestAppender"{color});
{color:#000080}return null{color};
}
{color:#000080}if {color}(layout == {color:#000080}null{color}) {
layout = PatternLayout.createDefaultLayout();
}
{color:#000080}return new {color}TestAppender(name, filter, layout);
}
{color:#000080}public {color}List<String> getMessages() {
{color:#000080}return {color}{color:#660e7a}messages{color};
}
{color:#000080}public void {color}clearAppender() {
{color:#000080}this{color}.{color:#660e7a}messages {color}= {color:#000080}new
{color}ArrayList<>();
}
}
After moving to Log4j2.11, I am seeing that the getMessages is returning empty
after I am logging something. I attached a debugger and can see that the
append() method is being invoked and the message list is getting populated,
however at the time of verififcation it is magically vanishing off. Reverting
back to 2.8 fixes this.
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