java error

[little_lyy]

 I am a new Java beginner. I have updated Eclipse yesterday, and the once successfully run code turned out to be Error. Any help would be appreciated.

Here is my error: 

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 

String cannot be resolved to a type

No exception of type JSONException can be thrown; an exception type must be a subclass of Throwable

String cannot be resolved to a type

URL cannot be resolved to a type

URL cannot be resolved to a type

HttpURLConnection cannot be resolved to a type

HttpURLConnection cannot be resolved to a type

String cannot be resolved to a type

OutputStream cannot be resolved to a type

BufferedReader cannot be resolved to a type

BufferedReader cannot be resolved to a type

InputStreamReader cannot be resolved to a type

String cannot be resolved to a type

String cannot be resolved to a type

System cannot be resolved

System cannot be resolved

MalformedURLException cannot be resolved to a type

IOException cannot be resolved to a type

at testKazooApi.main(testKazooApi.java:13)

Here is my code:

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import org.json.JSONArray;

import org.json.JSONException;

public class testKazooApi {

public static void main(String[] args) throws JSONException {

 

try {

String targetURL = "http://10.253.20.250:8000/v1/user_auth";

URL targetUrl = new URL(targetURL);

HttpURLConnection httpConnection = (HttpURLConnection) targetUrl.openConnection();

httpConnection.setDoOutput(true);

httpConnection.setRequestMethod("PUT");

httpConnection.setRequestProperty("Content-Type", "application/json");

httpConnection.setRequestProperty("Accept","application/json");

 

String input = "{\"data\":{ \"credentials\":\"2d08086927f4d87a31154aaf0ba2e067\",\"realm\":\"test01.ccuat.com\"},\"verb\":\"PUT\"}";

OutputStream outputStream = httpConnection.getOutputStream();

outputStream.write(input.getBytes());

outputStream.flush();

 

 

BufferedReader responseBuffer = new BufferedReader(new InputStreamReader(

(httpConnection.getInputStream())));

 

String output;

String result = "";

System.out.println("Output from Server:\n");

while ((output = responseBuffer.readLine()) != null) {

result = result+output;

System.out.println(output);

}

 

 

 } catch (MalformedURLException e) {

 

e.printStackTrace();

 

 } catch (IOException e) {

 

e.printStackTrace();

 

}

 

}

}