textfield - JavaFX: ClassNotFoundException for imported class in FXML -

i'm trying create textfield title embedded in field border like:

following solution posted here i've created .java file called titledborder.java within src>main>java directory. fxml in src>main>resources directory , i've added:

<?import titledborder?> @ top , shows no error like:

i added code fxml

<hbox prefheight="100.0" prefwidth="200.0">     <children>       <titledborder title="email" >         <textfield fx:id="emailfield" prefheight="44.0" prefwidth="143.0" />       </titledborder>     </children> </hbox> 

and shows no error either. launch main method in class in src>main>java gets error in .fxml saying javafx.fxml.loadexception: /c:/users/me/documents/automation/target/classes/demofxml.fxml

and

caused by: java.lang.classnotfoundexception     @ javafx.fxml.fxmlloader.loadtype(fxmlloader.java:2899) 

i'm not sure why references "/target/classes/..." opposed "/src/main/java/...".

this fxml example i've found i'm confused why i'm getting error upon compiling, yet no errors shown prior? removing reference titledborder allows code function/compile properly. since in src package use code in fxml connect w/ controller fx:controller="loadcontroller">. css added too.

thoughts?

the line

<?import titledborder?> 

implies put titledborder.java file default package (i.e. no package declaration in source code of file). fxmlloader's source code checks imports in fxml file , splits package path name , class name in loadtype(...) below, load imported class later loadtypeforpackage():

private class<?> loadtype(string name, boolean cache) throws classnotfoundexception {     int = name.indexof('.');     int n = name.length();     while (i != -1         && < n         && character.islowercase(name.charat(i + 1))) {         = name.indexof('.', + 1);     }      if (i == -1 || == n) {         throw new classnotfoundexception();     }      string packagename = name.substring(0, i);     string classname = name.substring(i + 1);      class<?> type = loadtypeforpackage(packagename, classname);      if (cache) {         classes.put(classname, type);     }      return type; }  // todo rename loadtype() when deprecated static version removed private class<?> loadtypeforpackage(string packagename, string classname) throws classnotfoundexception {     return getclassloader().loadclass(packagename + "." + classname.replace('.', '$')); } 

the imported class name "titledborder" variable i @ 1st line in loadtype method evaluated name.indexof('.') = -1, , throw classnotfoundexception in next lines of code.

generally bad practice use default packages. put titledborder.java package , import as

<?import my.some.package.titledborder?>