Fix StringIndexOutOfBoundsException message in StrBuilder.append(char[],

int, int)

Author: garydgregory

src/changes/changes.xml

@@ -111,6 +111,7 @@ The <action> type attribute can be add,update,fix,remove.
     <action issue="LANG-1452" type="fix" dev="ggregory" due-to="Gary Gregory, Aleksey Novozhilov, Sara">RecursiveToStringStyle and MultilineRecursiveToStringStyle shouldn't recurse into a java.math.BigDecimal #1584.</action>
     <action issue="LANG-1814" type="fix" dev="ggregory" due-to="Ivan Ponomarev">ArrayUtils.subarray(..) may overflow index arithmetic and violate contract for extreme index values.</action>
     <action issue="LANG-1816" type="fix" dev="ggregory" due-to="Ivan Ponomarev, Gary Gregory">ArrayUtils contains/indexOf/indexesOf with tolerance fail to match NaN values #1589.</action>
+    <action                   type="fix" dev="ggregory" due-to="Ivan Ponomarev, Gary Gregory">Fix StringIndexOutOfBoundsException message in StrBuilder.append(char[], int, int).</action>
     <!-- ADD -->
     <action                   type="add" dev="ggregory" due-to="Gary Gregory">Add JavaVersion.JAVA_27.</action>
     <action                   type="add" dev="ggregory" due-to="Gary Gregory">Add SystemUtils.IS_JAVA_27.</action>

src/main/java/org/apache/commons/lang3/text/StrBuilder.java

@@ -394,7 +394,7 @@ public StrBuilder append(final char[] chars, final int startIndex, final int len
             return appendNull();
         }
         if (startIndex < 0 || startIndex > chars.length) {
-            throw new StringIndexOutOfBoundsException("Invalid startIndex: " + length);
+            throw new StringIndexOutOfBoundsException("Invalid startIndex: " + startIndex);
         }
         if (length < 0 || startIndex + length > chars.length) {
             throw new StringIndexOutOfBoundsException("Invalid length: " + length);