<script>
function myFunction(){
    location.href = 'path/to/java/method=with_some_parameters';
}
</script>

<script>
 function myFunction(){
  jQuery.ajax({
   url:'path/to/java/method=with_some_parameters'
   async:false,
   success:function(data){
   //nested ajax

   }
  }
 }
</script>