Switch the default exception handler of PL to %ex

Author: vy

log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/PatternParser.java

@@ -212,7 +212,7 @@ public List<PatternFormatter> parse(
             list.add(new PatternFormatter(pc, field));
         }
         if (alwaysWriteExceptions && !handlesThrowable) {
-            final LogEventPatternConverter pc = ExtendedThrowablePatternConverter.newInstance(config, new String[0]);
+            final LogEventPatternConverter pc = ThrowablePatternConverter.newInstance(config, new String[0]);
             list.add(new PatternFormatter(pc, FormattingInfo.getDefault()));
         }
         return list;

src/changelog/.2.x.x/.release-notes.adoc.ftl

@@ -35,8 +35,11 @@ See our xref:graalvm.adoc[GraalVM guide] for details.
 
 Exception handling in xref:manual/pattern-layout.adoc[Pattern Layout] went through a major rewrite.
 This effectively helped with fixing some bugs by matching the feature parity of all exception converters.
-Additionally, rendered stack traces are ensured to be prefixed with a newline, which used to be a whitespace in earlier versions.
-The support for the `\{ansi}` option in exception converters is removed too.
+Some important highlights from this rewrite:
+
+* Rendered stack traces are ensured to be prefixed with a newline, which used to be a whitespace in earlier versions.
+* Switched the default exception converter from xref:manual/pattern-layout.adoc#converter-exception-extended[the extended exception converter] to xref:manual/pattern-layout.adoc#converter-exception[the plain exception converter], which is more performant.
+* The support for the `\{ansi}` option in exception converters is removed.
 
 [#release-notes-2-25-0-instant-format]
 === Date & time formatting

src/changelog/.2.x.x/2691_change_PatternLayout_exception_rendering.xml

@@ -4,5 +4,6 @@
        xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
        type="changed">
   <issue id="2691" link="https://github.com/apache/logging-log4j2/pull/2691"/>
+  <issue id="3123" link="https://github.com/apache/logging-log4j2/pull/3123"/>
   <description format="asciidoc">Consolidate exception rendering logic and improve circular reference support in Pattern Layout</description>
 </entry>

src/changelog/.2.x.x/2691_deprecate_ThrowableProxy.xml

@@ -4,5 +4,6 @@
        xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
        type="deprecated">
   <issue id="2691" link="https://github.com/apache/logging-log4j2/pull/2691"/>
+  <issue id="3123" link="https://github.com/apache/logging-log4j2/pull/3123"/>
   <description format="asciidoc">Deprecate `ThrowableProxy` and all its usages</description>
 </entry>

src/changelog/.2.x.x/3123_change_PatternLayout_exception_renderer.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns="https://logging.apache.org/xml/ns"
+       xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
+       type="changed">
+  <issue id="3123" link="https://github.com/apache/logging-log4j2/pull/3123"/>
+  <description format="asciidoc">Switch the default exception converter from xref:manual/pattern-layout.adoc#converter-exception-extended[the extended exception converter] to xref:manual/pattern-layout.adoc#converter-exception[the plain exception converter]</description>
+</entry>