未处理的异常类型NoSuchFieldException（java反射）

发布于 2024-12-16 16:11:48 字数 404 浏览 1 评论 0原文

我使用 Play Framework 大约 1 个月，这是一件很棒的事情，但我遇到了一个大问题。我尝试在安全控制器中运行以下代码：

MyModel myModel = MyModel.all().first(); 
Field idField = myModel.getClass().getField("id");

关于第 2 行 Play 说：编译错误

The file /app/controllers/Security.java could not be compiled. Error 
raised is : Unhandled exception type NoSuchFieldException

也许这是一个核心错误？谢谢。

原文

I am using Play Framework about 1 month and it is a great thing, but I had one big problem
.
I`ve try to run following code in secure controller:

MyModel myModel = MyModel.all().first(); 
Field idField = myModel.getClass().getField("id");

About line 2 Play says:
Compilation error

The file /app/controllers/Security.java could not be compiled. Error 
raised is : Unhandled exception type NoSuchFieldException

Maybe it`s a core bug?
Thanks.

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放我走吧 2024-12-23 16:11:48

您应该处理 getField(String fieldName) 可能引发的异常。在本例中为 NoSuchFieldException。

尝试这样写：

Field idField = null;
try {
    idField = myModel.getClass().getField("id");
} catch (NoSuchFieldException nsfe) {
    throw new RuntimeException(nsfe);
}

You should handle the exception that getField(String fieldName) can throw. In this case a NoSuchFieldException.

Try to write it as such:

Field idField = null;
try {
    idField = myModel.getClass().getField("id");
} catch (NoSuchFieldException nsfe) {
    throw new RuntimeException(nsfe);
}

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甜｀诱少女 2024-12-23 16:11:48

如果您使用 dp4j 的 @TestPrivates 或 @Reflect(catchExceptions =true)< /code> 您不需要自己编写 catch 语句：

public class Security{

@Reflect(catchExceptions =true) //when false it will add the exceptions to the throws list.
public void aMethod(){
    MyModel myModel = MyModel.all().first(); 
    Field idField = myModel.getClass().getField("id"); 
    //you might as well write:
    // int id = myModel.id;
}

If you use dp4j's @TestPrivates or @Reflect(catchExceptions =true) you don't need to write the catch statements yourself:

public class Security{

@Reflect(catchExceptions =true) //when false it will add the exceptions to the throws list.
public void aMethod(){
    MyModel myModel = MyModel.all().first(); 
    Field idField = myModel.getClass().getField("id"); 
    //you might as well write:
    // int id = myModel.id;
}

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