Index: log4j-core/src/test/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiterTest.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/log4j-core/src/test/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiterTest.java b/log4j-core/src/test/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiterTest.java
new file mode 100644
--- /dev/null	(date 1640862263188)
+++ b/log4j-core/src/test/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiterTest.java	(date 1640862263188)
@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache license, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the license for the specific language governing permissions and
+ * limitations under the license.
+ */
+package org.apache.logging.log4j.core.config.arbiters;
+
+import org.apache.logging.log4j.core.Appender;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.appender.ConsoleAppender;
+import org.apache.logging.log4j.core.config.Configurator;
+import org.apache.logging.log4j.test.appender.ListAppender;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Tests basic condition processing.
+ */
+public class ClassArbiterTest {
+
+    static final String CONFIG = "log4j2-classArbiters.xml";
+    static LoggerContext loggerContext = null;
+
+    @AfterEach
+    public void after() {
+        loggerContext.stop();
+        loggerContext = null;
+    }
+
+    @Test
+    public void classTest() {
+        loggerContext = Configurator.initialize(null, CONFIG);
+        assertNotNull(loggerContext);
+        Appender app = loggerContext.getConfiguration().getAppender("Out");
+        assertNotNull(app);
+        assertTrue(app instanceof ConsoleAppender);
+
+        Appender app2 = loggerContext.getConfiguration().getAppender("Out2");
+        assertNull(app2);
+    }
+
+}
Index: log4j-core/src/test/resources/log4j2-classArbiters.xml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/log4j-core/src/test/resources/log4j2-classArbiters.xml b/log4j-core/src/test/resources/log4j2-classArbiters.xml
new file mode 100644
--- /dev/null	(date 1640862263194)
+++ b/log4j-core/src/test/resources/log4j2-classArbiters.xml	(date 1640862263194)
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements.  See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+-->
+<Configuration name="ConfigTest" status="ERROR" monitorInterval="5">
+  <Appenders>
+
+      <ClassArbiter className="java.lang.String">
+        <Console name="Out">
+          <PatternLayout pattern="%m%n"/>
+        </Console>
+      </ClassArbiter>
+
+      <ClassArbiter className="foo.bar.not.a.real.ClassName">
+        <List name="Out2"/>
+      </ClassArbiter>
+
+  </Appenders>
+  <Loggers>
+    <Logger name="org.apache.test" level="trace" additivity="false">
+      <AppenderRef ref="Out"/>
+    </Logger>
+    <Root level="error">
+      <AppenderRef ref="Out"/>
+    </Root>
+  </Loggers>
+</Configuration>
\ No newline at end of file
Index: log4j-core/src/main/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiter.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/log4j-core/src/main/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiter.java b/log4j-core/src/main/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiter.java
--- a/log4j-core/src/main/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiter.java	(revision 8c1ea147ae157bd7465a5370a17cd576058a4c37)
+++ b/log4j-core/src/main/java/org/apache/logging/log4j/core/config/arbiters/ClassArbiter.java	(date 1640860766712)
@@ -41,8 +41,8 @@
     }
 
     @PluginBuilderFactory
-    public static SystemPropertyArbiter.Builder newBuilder() {
-        return new SystemPropertyArbiter.Builder();
+    public static ClassArbiter.Builder newBuilder() {
+        return new ClassArbiter.Builder();
     }
 
     public static class Builder implements org.apache.logging.log4j.core.util.Builder<ClassArbiter> {