[LANG-1792] TypeUtils.toString() skips angle brackets for Class type

Author: garydgregory

src/changes/changes.xml

@@ -55,6 +55,7 @@ The <action> type attribute can be add,update,fix,remove.
     <action                   type="fix" dev="ggregory" due-to="mayuming, Gary Gregory">Fix test fixture in ReflectionDiffBuilderTest.testTransientFieldDifference() #1464.</action>
     <action issue="LANG-1789" type="fix" dev="ggregory" due-to="Hylke van der Schaaf, Gary Gregory">NullPointerException when generating NoSuchMethodException in MethodUtils.</action>
     <action issue="LANG-1786" type="fix" dev="ggregory" due-to="Daniel Migowski, Gary Gregory, Lenny Primak">Map deprecated TimeZone short IDs and avoid JRE WARNINGs to the console #1483.</action>
+    <action issue="LANG-1792" type="fix" dev="ggregory" due-to="Mykhailo Hryb, Gary Gregory">TypeUtils.toString() skips angle brackets for Class type.</action>
     <!-- ADD -->
     <action                   type="add" dev="ggregory" due-to="Gary Gregory">Add SystemProperties.getPath(String, Supplier&lt;Path&gt;).</action>
     <action                   type="add" dev="ggregory" due-to="Gary Gregory">Add JavaVersion.JAVA_25.</action>

src/main/java/org/apache/commons/lang3/reflect/TypeUtils.java

@@ -358,7 +358,7 @@ private static <T> String classToString(final Class<T> cls) {
             buf.append(cls.getName());
         }
         if (cls.getTypeParameters().length > 0) {
-            CTJ_JOINER.join(buf, (TypeVariable[]) cls.getTypeParameters());
+            GT_JOINER.join(buf, (TypeVariable[]) cls.getTypeParameters());
         }
         return buf.toString();
     }

src/test/java/org/apache/commons/lang3/reflect/Lang1792Test.java

@@ -0,0 +1,36 @@
+/*
+ * 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
+ *
+ *      https://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.commons.lang3.reflect;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests https://issues.apache.org/jira/browse/LANG-1792
+ *
+ * @param <U> See https://issues.apache.org/jira/browse/LANG-1792
+ */
+public class Lang1792Test<U extends Number> {
+
+    @Test
+    void testStackOverflowError() {
+        assertEquals("org.apache.commons.lang3.reflect.Lang1792Test<U extends java.lang.Number>", TypeUtils.toString(Lang1792Test.class));
+    }
+
+}