Databases
StackOverflow2013
Postsdbo
POWhat's the difference between http://localhost:8000/ and http://127.0.0.1:8000/ for Java Applets
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhat's the difference between http://localhost:8000/ and http://127.0.0.1:8000/ for Java Applets
    primarykey
    data
    text
    <p>I have a question/problem related to Java Applet security...<br> I use the Applet that has to take files from server (ASP.NET) and represent the information from it. Applet take files using the code:</p> <pre><code>URL u = new URL(getCodeBase(), filename); BufferedReader d = new BufferedReader(new InputStreamReader(u.openStream())); </code></pre> <p>This code appears in two places:</p> <ol> <li><code>Init()</code> method </li> <li>Some another method <code>Test()</code> that called manually from JavaScript </li> </ol> <p>So, when I try to load the page with Applet using the URL <code>http://127.0.0.1:8000/Test.aspx</code>, everything works fine and I can read file content from both methods. But if I change the URL on <code>http://localhost:8000/</code>, only the first method works properly and I can get files content and for the second one I get the next error message in JavaConsole:</p> <blockquote> <p>java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:8000 connect,resolve)</p> </blockquote> <p>What it the difference in this case? Why 'localhost' is impossible in this case? Is there any way how to grant access to 'localhost' the same as 127.0.0.1?</p> <p>here is simplest applet's example:</p> <pre><code>public class TestApplet extends Applet { public void init() { System.out.println( "init..."); readDocument(); } public void readDocument() { System.out.println( "read test.txt file..."); URL base = getCodeBase(); String filename = "test.txt"; try { URL u = new URL(base, filename); BufferedReader d = new BufferedReader(new InputStreamReader(u.openStream())); System.out.println(d.readLine()); System.out.println("Done!"); } catch (Exception e) { e.printStackTrace(); } } } </code></pre> <p>and next code used on the client side:</p> <pre><code>&lt;applet archive="/Content/test.jar" code="test.TestApplet.class" name="testApplet" mayscript&gt;&lt;/applet&gt; &lt;script language="javascript" type="text/javascript"&gt; $(document).ready(function () { var testApplet = document.testApplet; testApplet.readDocument(); }); &lt;/script&gt; </code></pre> <p>this code works perfectly when I try to use <a href="http://127.0.0.1:8000/Test.aspx" rel="nofollow">http://127.0.0.1:8000/Test.aspx</a> and doesn't work when I user <a href="http://localhost:8000/Test.aspx" rel="nofollow">http://localhost:8000/Test.aspx</a>. I java console I see the next:</p> <pre><code>init... read test.txt file... some text... Done! read test.txt file... java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:8000 connect,resolve) at java.security.AccessControlContext.checkPermission(Unknown Source) at java.security.AccessController.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkConnect(Unknown Source) at sun.plugin2.applet.Applet2SecurityManager.checkConnect(Unknown Source) at java.net.Socket.connect(Unknown Source) at sun.net.NetworkClient.doConnect(Unknown Source) at sun.net.www.http.HttpClient.openServer(Unknown Source) at sun.net.www.http.HttpClient.openServer(Unknown Source) at sun.net.www.http.HttpClient.&lt;init&gt;(Unknown Source) at sun.net.www.http.HttpClient.New(Unknown Source) at sun.net.www.http.HttpClient.New(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at java.net.URL.openStream(Unknown Source) at test.TestApplet.readDocument(TestApplet.java:30) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at sun.plugin.javascript.JSInvoke.invoke(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source) at sun.plugin2.liveconnect.JavaClass$MethodInfo.invoke(Unknown Source) at sun.plugin2.liveconnect.JavaClass$MemberBundle.invoke(Unknown Source) at sun.plugin2.liveconnect.JavaClass.invoke0(Unknown Source) at sun.plugin2.liveconnect.JavaClass.invoke(Unknown Source) at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$DefaultInvocationDelegate.invoke(Unknown Source) at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo.doObjectOp(Unknown Source) at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$LiveConnectWorker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) </code></pre> <p>P.S.: Applet is signed.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USPaŭlo Ebermann
    1. USMr. Pumpkin
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POWhat's the difference between http://localhost:8000/ and http://127.0.0.1:8000/ for Java Applets
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POWhat's the difference between http://localhost:8000/ and http://127.0.0.1:8000/ for Java Applets
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POWhat's the difference between http://localhost:8000/ and http://127.0.0.1:8000/ for Java Applets
      1. This table or related slice is empty.
      1. VTUpMod
    1. COin both cases you access "127.0.0.1", I don't see where you call "localhost", or have a problem with localhost...
      singulars
      1. POWhat's the difference between http://localhost:8000/ and http://127.0.0.1:8000/ for Java Applets
      1. USwoliveirajr
    2. COHow does the javascript invoke the `Test` method? How does it create the URL? Can you ensure it uses the same URL as the Applet does in the browser?
      singulars
      1. POWhat's the difference between http://localhost:8000/ and http://127.0.0.1:8000/ for Java Applets
      1. USsudocode
    3. COyes... misspelling... changed
      singulars
      1. POWhat's the difference between http://localhost:8000/ and http://127.0.0.1:8000/ for Java Applets
      1. USMr. Pumpkin
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload