Index: src/main/java/common/javax/swing/text/DefaultCaret.java =================================================================== --- src/main/java/common/javax/swing/text/DefaultCaret.java (revision 494856) +++ src/main/java/common/javax/swing/text/DefaultCaret.java (working copy) @@ -674,6 +674,9 @@ * selectionColor. */ public void install(final JTextComponent c) { + if (c == null) { // Fix for HARMONY-1750, for compatiblity with RI + throw new NullPointerException("component is null"); + } if (!setComponent(c)) { return; }