PHP Javabridge: Call to undefined function java_import() when import a class

PHP Javabridge: Call to undefined function java_import() when import a class

help me please.
success to execute
include 'Java.inc';
echo java("java.lang.System")->getProperties();
but, get error when trying import a class:
include 'Java.inc';
var_dump(java_import("java.lang.Integer", NULL, FALSE));
Fatal error: Call to undefined function java_import() in
D:\www\test\javabridge\test_import_class.php on line 3