Feature : Allow setting custom linefeed on DefaultXmlPrettyPrinter

src/main/java/com/fasterxml/jackson/dataformat/xml/util/DefaultXmlPrettyPrinter.java

@@ -79,10 +79,24 @@ public interface Indenter
 
     /**
      * By default, will try to set as System.getProperty("line.separator")
-     * can later set custom lineFeed with withCustomlineFeed method
+     * Can later set custom lineFeed with withCustomlineFeed method
      * @since 2.15
      */
-    protected static String _lineFeed;
+    private final static String DEFAULT_LINE_FEED;
+    static {
+        String lf = null;
+        try {
+            lf = System.getProperty("line.separator");
+        } catch (Throwable t) { } // access exception?
+
+        if (lf != null) {
+            DEFAULT_LINE_FEED = lf;
+        } else {
+            DEFAULT_LINE_FEED = "\n"; // incase system has changed property name? line.separator
+        }
+    }
+
+    protected static String _lineFeed = DEFAULT_LINE_FEED;
 
     /*
     /**********************************************************
@@ -133,23 +147,11 @@ public void indentObjectsWith(Indenter i)
 
     public void spacesInObjectEntries(boolean b) { _spacesInObjectEntries = b; }
 
-    /**
-     * Initialize lineFeed with systemDefault.
-     * @since 2.15
-     */
-    static {
-        String lf = null;
-        try {
-            lf = System.getProperty("line.separator");
-        } catch (Throwable t) { } // access exception?
-        _lineFeed = lf;
-    }
-
     /**
      * Sets custom linefeed
      * @since 2.15
      */
-    public DefaultXmlPrettyPrinter withCustomlineFeed(String lineFeed) {
+    public DefaultXmlPrettyPrinter withCustomLineFeed(String lineFeed) {
         // 06-Feb-2023, joohyukkim: when JacksonException extends RuntimeExceptions, throw it?
         if (lineFeed != null) {
             _lineFeed = lineFeed;

src/test/java/com/fasterxml/jackson/dataformat/xml/ser/XmlPrettyPrinterTest.java

@@ -195,7 +195,7 @@ public void testLineFeed_withCustomLineFeed() throws Exception {
         root.employee.add(new Employee("abc"));
 
         String xml = _xmlMapper.writer()
-            .with(new DefaultXmlPrettyPrinter().withCustomlineFeed("\n\rLF\n\r"))
+            .with(new DefaultXmlPrettyPrinter().withCustomLineFeed("\n\rLF\n\r"))
             .with(ToXmlGenerator.Feature.WRITE_XML_DECLARATION)
             .writeValueAsString(root);
         // unify possible apostrophes to quotes
@@ -243,7 +243,7 @@ public void testLineFeed_UseSystemDefaultLineSeperatorOnNullCustomLineFeed() thr
         root.employee.add(new Employee("abc"));
 
         String xml = _xmlMapper.writer()
-            .with(new DefaultXmlPrettyPrinter().withCustomlineFeed(null))
+            .with(new DefaultXmlPrettyPrinter().withCustomLineFeed(null))
             .with(ToXmlGenerator.Feature.WRITE_XML_DECLARATION)
             .writeValueAsString(root);
         // unify possible apostrophes to quotes