Synthetic accessor method warning

Question

I've made some new warning settings in eclipse. With these new settings I'm facing a strange warning. After reading I got to know what it is but couldn't find a way to remove it.

Here is my problem with the sample code

public class Test {
    private String testString;

    public void performAction() {

        new Thread( new Runnable() {
            @Override
            public void run() {
                testString = "initialize"; // **
            }
        });
    }
}

The line with ** gives me a warning in eclipse

Read access to enclosing field Test.testString is emulated by a synthetic accessor method. 
Increasing its visibility will improve your performance.

Problem is, I don't want to change the access modifier of testString. Also, don't want to create a getter for it.

What change should be done?

---

More descriptive example 

public class Synthetic
{
    private JButton testButton;

    public Synthetic()
    {
        testButton = new JButton("Run");
        testButton.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent ae)
                {
                    /* Sample code */
                    if( testButton.getText().equals("Pause") ) {
                        resetButton(); // **    
                    } else if( testButton.getText().equals("Run") ) {
                        testButton.setText("Pause"); // **  
                    }

                }
            }
        );
    }

    public void reset() {
        //Some operations
        resetButton();
    }

    private void resetButton() {
        testButton.setText("Run");
    }
}

Lines with ** gives me the same warning.

Answer 1

In your second example it is not necessary to access testButton directly; you can access it by retrieving the source of the action event.

For the resetButton() method you can add an argument to pass the object to act upon, if you've done that it is not such a big problem lowering its access restrictions.