TestNg skipping @BeforeSuite and @BeforeClass when running in group

When running TestNg with groups it is skipping @BeforeClass and @BeforeSuite methods. however running without group it execute @BeforeClass and @BeforeSuite

Code :

class TestStructure {

 @BeforeClass
 public void loadData() {
  System.out.println("loaded");
 }

 @BeforeSuite
 public void loadSysData() {
  System.out.println("loaded2");
 }
}


class Test extends TestStructure
{

    @Test(groups={"UAP"})
    public void test1
    {
     System.out.println("Test 2");
    }

}

The testng.xml file is

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="UAP suite" parallel="false" thread-count="1" verbose="1">
   <listeners>
      <listener class-name="com.module.listener.TestNGListener" />
   </listeners>

   <test name="TestSet 1" parallel="false" preserve-order="true">
      <groups>
         <run>
            <include name="UAP" />
         </run>
      </groups>
      <classes>
         <class name="Test" />
      </classes>
   </test>
</suite>

If I remove group from the xml then @BeforeClass and @BeforeSuite are executed. Please help.