Java Google应用程序引擎文本的NullPointerException

我有以下带有

Text

属性的概要bean：

import com.google.appengine.api.datastore.Text;

public class Profile {
    ... 
    private Text aboutMySelf = null;

    public String getAboutMySelf() {
        return aboutMySelf.getValue();
    }
    public void setAboutMySelf(String aboutMySelf) {
        this.aboutMySelf = new Text(aboutMySelf);
    }
    ...
}

当获得关于你自己的

时，我有ff条件

if (profile.getAboutMySelf() != null){
    ...
}

问题是我仍然遇到了行
if（profile.getAboutMySelf（）！=null）
为什么？如何修复它

堆栈跟踪：

Uncaught exception from servlet
java.lang.NullPointerException
    at Profile.getAboutMySelf(Profile.java:263)
    at ...(.....java:137)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:45)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:453)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:292)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:255)
    at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
    at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
    at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)

您需要检查配置文件是否为空。如果（profile！=null）我确定profile不是null，那么只有
aboutMySelf
，因为profile.getAboutMySelf（profile.java:263）上还有profileat.getAboutMySelf的其他属性。这行中的u代码是什么？让
return（aboutMySelf==null）可以吗？“”：aboutMySelf.getValue（）在getter中？是的，我想你可以试试。