GWT RPC每次都返回空值

Question

我有一個問題，我的類沒有序列化，而是GWT RPC每次都返回null。我試圖通過RPC發送Test類型的對象。這是我的課：

public class Test implements Serializable { 
    /** 
    * 
    */ 
    private static final long serialVersionUID = 2857617541722878389L; 
    private int testID; 
    private String testName; 
    private String testTheme; 
    private String subject; 
    private int questAmount; 
    private long created; 
    private int timer; 

    /** 
    * @gwt.typeArgs <com.nimeria.client.TestCell> 
    */ 
    private ArrayList<TestCell> tasks = new ArrayList<TestCell>(); 

    public Test(String testName) { 
     super(); 
     this.testName = testName; 
    } 

    public Test(String testName, String testTheme) { 
     super(); 
     this.testName = testName; 
     this.testTheme = testTheme; 
    } 

    public Test(int testID, String testName, String testTheme, int questAmount, 
      ArrayList<TestCell> tasks) { 
     super(); 
     this.testID = testID; 
     this.testName = testName; 
     this.testTheme = testTheme; 
     this.questAmount = questAmount; 
     this.tasks = tasks; 
    } 

    public int getTimer() { 
     return timer; 
    } 

    public void setTimer(int timer) { 
     this.timer = timer; 
    } 

    public String getSubject() { 
     return subject; 
    } 

    public void setSubject(String subject) { 
     this.subject = subject; 
    } 

    public long getCreated() { 
     return created; 
    } 

    public void setCreated(long created) { 
     this.created = created; 
    } 

    public Test(int testID, String testName, String testTheme, String subject, 
      int questAmount, long created, int timer) { 
     this.created = created; 
     this.testID = testID; 
     this.testName = testName; 
     this.testTheme = testTheme; 
     this.questAmount = questAmount; 
     this.timer = timer; 
     this.subject = subject; 
    } 

    public Test() { 
     // TODO Auto-generated constructor stub 
    } 

    public int getTestID() { 
     return testID; 
    } 

    public void setTestID(int testID) { 
     this.testID = testID; 
    } 

    public String getTestName() { 
     return testName; 
    } 

    public void setTestName(String testName) { 
     this.testName = testName; 
    } 

    public int getQuestAmount() { 
     return questAmount; 
    } 

    public void setQuestAmount(int questAmount) { 
     this.questAmount = questAmount; 
    } 

    /** 
    * @gwt.typeArgs <com.nimeria.client.TestCell> 
    */ 
    public ArrayList<TestCell> getTasks() { 
     return tasks; 
    } 

    /** 
    * @gwt.typeArgs tasks <com.nimeria.client.TestCell> 
    */ 
    public void setTasks(ArrayList<TestCell> tasks) { 
     this.tasks = tasks; 
    } 

    public String getTestTheme() { 
     return testTheme; 
    } 

    public void amountIncrement() { 
     this.questAmount++; 
    } 
} 

public class TestCell implements Serializable { 

    /** 
    * 
    */ 
    private static final long serialVersionUID = 985354326237784028L; 
    private int taskId; 
    private String quest; 
    private int qustionsAmount; 
    private int rightAnswer; 
    private int type; 
    /** 
    * @gwt.typeArgs <java.lang.String> 
    */ 
    private ArrayList<String> qustions = new ArrayList<String>(); 

    public TestCell(int taskId, int qustionsAmount, int rightAnswer, int type) { 
     super(); 
     this.taskId = taskId; 
     this.qustionsAmount = qustionsAmount; 
     this.rightAnswer = rightAnswer; 
     this.type = type; 
    } 

    public TestCell(int taskId, int qustionsAmount, int type) { 
     super(); 
     this.taskId = taskId; 
     this.qustionsAmount = qustionsAmount; 
     this.type = type; 
    } 

    public TestCell(int taskId, int qustionsAmount) { 
     super(); 
     this.taskId = taskId; 
     this.qustionsAmount = qustionsAmount; 
    } 

    public TestCell(int taskId, String quest, int qustionsAmount, 
      int rightAnswer, int type, String q1, String q2, String q3, 
      String q4, String q5) { 
     this.taskId = taskId; 
     this.quest = quest; 
     this.qustionsAmount = qustionsAmount; 
     this.rightAnswer = rightAnswer; 
     this.type = type; 
     this.qustions.add(q1); 
     this.qustions.add(q2); 
     this.qustions.add(q3); 
     this.qustions.add(q4); 
     this.qustions.add(q5); 
    } 

    public int getType() { 
     return type; 
    } 

    public void setType(int type) { 
     this.type = type; 
    } 

    public int getTaskId() { 
     return taskId; 
    } 

    public void setTaskId(int taskId) { 
     this.taskId = taskId; 
    } 

    public String getQuest() { 
     return quest; 
    } 

    public void setQuest(String quest) { 
     this.quest = quest; 
    } 

    public int getQustionsAmount() { 
     return qustionsAmount; 
    } 

    public void setQustionsAmount(int qustionsAmount) { 
     this.qustionsAmount = qustionsAmount; 
    } 

    public int getQustionNumber() { 
     return taskId; 
    } 

    public void setQustionNumber(int qustionNumber) { 
     this.taskId = qustionNumber; 
    } 

    public int getRightAnswer() { 
     return rightAnswer; 
    } 

    public void setRightAnswer(int rightAnswer) { 
     this.rightAnswer = rightAnswer; 
    } 

    /** 
    * @gwt.typeArgs <java.lang.String> 
    */ 
    public ArrayList<String> getQustions() { 
     return qustions; 
    } 

    /** 
    * @gwt.typeArgs questions <java.lang.String> 
    */ 
    public void setQustions(ArrayList<String> qustions) { 
     this.qustions = qustions; 
    } 
} 

這是我的RPC調用：

conectModule.saveTest(t, new AsyncCallback<Integer>(){ 
    public void onFailure(Throwable caught) { 
     Window.alert(caught.getMessage()); 
     Window.alert(caught.getLocalizedMessage()); 
    } 

    public void onSuccess(Integer result) { 
     Window.alert("Тест сохранен"+result); 

     try { 
      loadTestListing(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
}); 

Answer 1

序列化類必須有一個默認的無參數的構造函數，即Test()和TextCell()。