Example

public class ClassA {
private int i = 1;
private int i2 = 0;

public void method() {
i2 ++;
}
}

Solution
The private field is never assigned after declaration, it should be declared final.
public class ClassA {
private final int i = 1;
private int i2 = 0;

public void method() {
i2 ++;
}
}