java - 为什么 DocumentBuilder Parse 在 Eclipse 中可以正常工作，但在 IntelliJ IDEA 中却不行？

Question

我一直在尝试通过 DocumentBuilder.Parse 解析一些 XML:

    try 
    {
        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost httpPost = new HttpPost(url);
        HttpResponse response = httpClient.execute(httpPost, localContext);
        InputStream in = response.getEntity().getContent();
        DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        Document doc = builder.parse(in);
        return doc;
    } 
    catch (Exception e) 
    {
        e.printStackTrace();
    }

这在 Eclipse 中运行良好并返回文档。

但是，在 IntelliJ IDEA 中运行，代码会命中 Document doc = builder.parse(in);，然后直接跳过整个 try/catch 并返回 null (或任何可能存在的代码)紧接在 try/catch 之后。

它不会抛出异常，也没有提供任何指示来说明为什么它可能会失败!

有谁知道为什么会发生这种情况？我真的不想再回到 Eclipse

编辑 - 演示:

        try {
        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost httpPost = new HttpPost(url);
        HttpResponse response = httpClient.execute(httpPost, localContext);
        InputStream in = response.getEntity().getContent();
        DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        Document doc = builder.parse(in); //if we step through to here, this line executes then goes directly to "x" below
        return doc;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null; //x

还尝试添加以下内容来捕获错误，但都没有命中:

            builder.setErrorHandler(new ErrorHandler() {
            @Override
            public void error(SAXParseException arg0) throws SAXException
            {
                throw arg0;
            }

            @Override
            public void fatalError(SAXParseException arg0) throws SAXException
            {
                throw arg0;
            }

            @Override
            public void warning(SAXParseException arg0) throws SAXException
            {
                throw arg0;
            }
        });

编辑 2:导入

import java.io.InputStream;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import com.google.android.gms.maps.model.LatLng;

import android.content.Context;
import android.util.Log;

Answer 1

(抱歉，此评论失控了!)

你的 JRE 是什么？另外，您可以粘贴此类的导入吗？从根本上来说，两个 IDE 都在同一个 JVM 上运行字节码，因此这对我来说听起来像是构建路径问题(缺少 jar/备用源)。您应该看到异常命中(尽管我将 Throwable 子类化，而不是捕获中的 Exception 子类)。

http://docs.oracle.com/javase/7/docs/api/javax/xml/parsers/DocumentBuilder.html#parse(java.io.InputStream) 。检查您的输入源是否为空源。 IllegalArgumentException 应该打印在 null 上，后面跟着 (in

查看您的代码:

  try {
    HttpClient httpClient = new DefaultHttpClient();
    HttpContext localContext = new BasicHttpContext();
    HttpPost httpPost = new HttpPost(url);
    HttpResponse response = httpClient.execute(httpPost, localContext);
    InputStream in = response.getEntity().getContent();
    DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); //**<--What class is this?**
    Document doc = builder.parse(in); //if we step through to here, this line executes then goes directly to "x" below
    return doc;
} catch (Exception e) { //<-- Does not catch Error
    e.printStackTrace();
}
return null; //x

尝试这样做:

try
{
  //Your code to read the document
} 
catch (Throwable t)
{
  t.printStackTrace(); //Check your output
  //Set your breakpoint HERE
  throw new RuntimeException(t.getMessage(), t); //Check the ExceptionHandler for the application.
}

我建议您的工厂不是您认为的工厂，或者您收到了 Error 类，并且代码之外的某些内容正在吞没该异常。您的构建路径很有可能设置不同。