com.sun.star.util.XReplaceDescriptor xReplaceDescriptor = null;
        com.sun.star.util.XSearchDescriptor xSearchDescriptor = null;
        com.sun.star.util.XReplaceable xReplaceable = null;

        xReplaceable = (com.sun.star.util.XReplaceable) com.sun.star.uno.UnoRuntime.
                       queryInterface(
                               com.sun.star.util.XReplaceable.class,
                               officeWriter1.getTextDocument());

        xReplaceDescriptor = (com.sun.star.util.XReplaceDescriptor)
                             xReplaceable.createReplaceDescriptor();

        xReplaceDescriptor.setSearchString("Word");
        xReplaceDescriptor.setReplaceString("Writer");
        xReplaceable.replaceAll(xReplaceDescriptor);