如果你需要状态，那么就引入状态。为每个请求创建一个有状态的对象：

public class ServiceImpl{
  public Object getData(){
    final DataGetter getter = new DataGetter();
    return getter.getData();
  }

  static class DataGetter {
    private boolen isSomeCondition;

    public Object getData(){
      callSomeMethod();
      if(isSomeCondition) {
        //do something
      } else {
        //do some other
      }
    }

    public void callSomeMethod(){
      if(someCondition) {
        //do something
      } else {
        //set isSomeCondition to true
        isSomeCondition=true;
      }
    }
  }
}

由于您使用的是Spring，因此更改bean范围也是一个选项：

@RequestScope
public class ServiceImpl {
  // ...
}

尝试如下所示的方法：不要将isSomeCondition作为全局变量，而是将其作为局部变量，并将其传递给方法。

public class ServiceImpl{

   public Object getData(){
   private boolen isSomeCondition;
   isSomeCondition = callSomeMethod(isSomeCondition);
   if(isSomeCondition)
   //do something
   else
  //do some other
  }

在这里根据您的条件，您可以设置它和返回。

public boolean callSomeMethod(){
    if(someCondition)
    //do something
    else
   //set isSomeCondition to true
    isSomeCondition=true;
   return isSomeCondition;
  }