JSF中 Target Unreachable, returned null錯誤的解決

頁面程式碼

選擇不同的下拉選單值報錯 Target Unreachable, returned null,感覺莫名奇妙，仔細檢查發現錯誤在Bean沒有初始化。

原bean：

package org.eastwill.view.bean;

public class PatientBasicBean {

private PatientBasic patientBasic;

private PatientComm patientComm;

... ...

改後Bean：

package org.eastwill.view.bean;

public class PatientBasicBean {

private PatientBasic patientBasic = new PatientBasic();
private PatientComm patientComm = new PatientComm();

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