Jersey ExceptionMapper未被调用 [英] Jersey ExceptionMapper not being invoked

问题描述

我正在尝试调用此异常映射器以返回404未找到的响应，但它一直返回500内部错误。泽西版是2.22.1。下面的代码片段。感谢所有帮助。

I am trying to invoke this exception mapper to return a 404 not found response but it keeps returning 500 internal error. Jersey version is 2.22.1. Code snippet below. Appreciate all help.

谢谢。

异常映射器类。

package org.learn.rest.messengerdemo.exception;

import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;

@Provider
public class DataNotFoundExceptionMapper implements  ExceptionMapper<DataNotFoundException>{

    @Override
    public Response toResponse(DataNotFoundException ex) {
        return Response.status(Response.Status.FORBIDDEN).build();
    }
}

异常类。

package org.learn.rest.messengerdemo.exception;

package org.learn.rest.messengerdemo.exception;

public class DataNotFoundException extends RuntimeException{

    private static final long serialVersionUID = 2176642539344388961L;

    public DataNotFoundException(String message)
    {
        super(message);
    }
}

服务类抛出的方法。

public Message getMessage(long messageId) {
    Message message =  messages.get(messageId);
    if(message == null)
    {
        throw new DataNotFoundException("Message with id " + messageId + " not found");
    }
    return message;
}

和资源类。

@GET
@Path("/{messageId}")
public Message getMessage(@PathParam("messageId") long messageId) {
    return messageService.getMessage(messageId);
}

推荐答案

查看<$ c来自您的之前的问题的$ c> web.xml ，您有这个

Looking at the web.xml from your previous question, you have this

<servlet>
    <servlet-name>Jersey Web Application</servlet-name>
    <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>jersey.config.server.provider.packages</param-name>
        <param-value>org.learn.rest.messengerdemo.resources</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

这个init-parm是什么 jersey.config.server.provider.packages 说泽西岛应该扫描命名包中的 @Path 带注释的资源类和 @Provider 注释提供者类并注册它们。

What this init-parm jersey.config.server.provider.packages says is that Jersey should scan the named package for @Path annotated resource class and @Provider annotated provider classes and register them.

您只有资源包 org.learn.rest.messengerdemo.resources 列出，但您 ExceptionMapper 位于不同的包中。默认行为是递归扫描，也表示子包。因此，如果您列出 org.learn.rest.messengerdemo ，则会同时命中资源包和例外包。或者您可以列出两个包，用逗号或分号分隔。无论哪种方式都可行

You only have the resources package org.learn.rest.messengerdemo.resources listed, but you ExceptionMapper is in a different package. The default behavior is to scan recursively, meaning sub-packages also. So if you listed org.learn.rest.messengerdemo instead, you would hit both the resources package and the exceptions package. Or you could list both packages, separated by comma or semi-colon. Either way would work

<param-value>org.learn.rest.messengerdemo</param-value>
<!-- OR -->
<param-value>
    org.learn.rest.messengerdemo.resources,
    org.learn.rest.messengerdemo.exception
</param-value>

这篇关于Jersey ExceptionMapper未被调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！