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https://issues.apache.org/jira/browse/LOG4J2-2720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16973198#comment-16973198
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Adwait Kumar Singh commented on LOG4J2-2720:
--------------------------------------------
Project in which I am seeing this is enterprise, though let me see if I can
recreate it in a sample project and post it on Github.
> 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
> Priority: Critical
> Fix For: 2.8
>
>
> I have written unit tests on Logs by creating a custom appender
>
>
> 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.
> {code:java}
> import java.io.Serializable;
> import java.util.ArrayList;
> import java.util.List;
> import org.apache.logging.log4j.core.Filter;
> import org.apache.logging.log4j.core.Layout;
> import org.apache.logging.log4j.core.LogEvent;
> import org.apache.logging.log4j.core.appender.AbstractAppender;
> import org.apache.logging.log4j.core.config.plugins.Plugin;
> import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
> import org.apache.logging.log4j.core.config.plugins.PluginElement;
> import org.apache.logging.log4j.core.config.plugins.PluginFactory;
> import org.apache.logging.log4j.core.impl.MutableLogEvent;
> import org.apache.logging.log4j.core.layout.PatternLayout;
> @Plugin(name = "TestAppender", category = "Core", elementType = "appender",
> printObject = true)
> public class TestAppender extends AbstractAppender {
> private List<String> messages = new ArrayList<>();
> TestAppender(String name, Filter filter, Layout<? extends Serializable>
> layout) {
> super(name, filter, layout);
> }
> @Override public void append(LogEvent event) {
> getMessages().add(((MutableLogEvent) (event)).getFormattedMessage());
> }
> @PluginFactory public static TestAppender createAppender(
> @PluginAttribute("name") String name,
> @PluginElement("Layout") Layout<? extends Serializable> layout,
> @PluginElement("Filter") final Filter filter,
> @PluginAttribute("otherAttribute") String otherAttribute) {
> if (name == null) {
> LOGGER.error("No name provided for TestAppender");
> return null;
> }
> if (layout == null) {
> layout = PatternLayout.createDefaultLayout();
> }
> return new TestAppender(name, filter, layout);
> }
> public List<String> getMessages() {
> return messages;
> }
> public void clearAppender() {
> this.messages = new ArrayList<>();
> }
> } {code}
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