To access your PC localhost from Android emulator, use 10.0.2.2 instead of 127.0.0.1. localhost or 127.0.0.1 refers to the emulated device itself, not the host the emulator is running on.

Reference: https://developer.android.com/studio/run/emulator-networking#networkaddresses

For **Genymotion** use:  **10.0.3.2** instead of 10.0.2.2 


if you are using genymotion then go to command prompt type ipconfig
-find for Ethernet adapter virtualBox host-only network:
-find for Ipv4 Address..............192.1**.**.*
copy 

http://192.1**.**.*/foldername/filename/filename.json or filename.php

to check if its working go to browser in emulator copy paste the url you should find the file which you are looking in your browser..

Sorry for English..
This worked for me hope this might help some one..
Thank u..


I am trying to reverse-sort a slice of integers in Go.

      example := []int{1,25,3,5,4}
      sort.Ints(example) // this will give me a slice sorted from 1 to the highest number

How do I sort it so that it goes from highest to lowest? so [25 5 4 3 1]

I have tried this 

    sort.Sort(sort.Reverse(sort.Ints(keys)))

Source: http://golang.org/pkg/sort/#Reverse

However, I am getting the error below

    # command-line-arguments
    ./Roman_Numerals.go:31: sort.Ints(keys) used as value

How do I reverse sort a slice of integer Go?

Consider this array of `p` tags indexed by data attributes.

    &lt;p class=&#39;my-class&#39; data-id=&#39;0&#39; data-id-index=&#39;1&#39;&gt;&lt;/p&gt;
    &lt;p class=&#39;my-class&#39; data-id=&#39;0&#39; data-id-index=&#39;2&#39;&gt;&lt;/p&gt;
    &lt;p class=&#39;my-class&#39; data-id=&#39;1&#39; data-id-index=&#39;1&#39;&gt;&lt;/p&gt;
    &lt;p class=&#39;my-class&#39; data-id=&#39;1&#39; data-id-index=&#39;2&#39;&gt;&lt;/p&gt;

To select a `p` by `data-id` and append text I can use:

    $(&#39;.my-class[data-id=&quot;&#39; + dataId + &#39;&quot;]&#39;).append(myText);

The above will append `myText` to all `p` tags with the same `data-id`. But what about if I wanted to select by both `data-id` and `data-id-index`? 

Using jQuery, how can I select elements by multiple data-attributes?

I am developing one app, and what I think I wanna do is receive data from server database in android. So I started to run some tutorials. I found one that is doing pretty much what I want. 
But I am getting: 

    detailMessage	&quot;failed to connect to localhost/127.0.0.1 (port 8080): connect failed: ECONNREFUSED (Connection refused)&quot; (id=830021648792)	

Whole code of this tutorial is here [link][1]

Error occurs on : 

`OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());`


  [1]: http://veereshr.com/Android/AndroidToServlet

I checked that:

 - firewall is disabled
 - ping is working
 - connection string is exactly the same as when I run the servlet from server admin interface - `http://localhost:8080/Requestor/RQSRV`
-the servlet is running 

My configuration :


 - Server : Glass Fish 4.0
 - Android App - Developed in Eclipse
 - Servlet - Developed in NetBeans



connect failed: ECONNREFUSED

I am developing one app, and what I think I wanna do is receive data from server database in android. So I started to run some tutorials. I found one that is doing pretty much what I want.
But I am getting:
<pre><code class="hljs language-bash">detailMessage	"failed to connect to localhost/127.0.0.1 (port 8080): connect failed: ECONNREFUSED (Connection refused)" (id=830021648792)	
</code></pre>
Whole code of this tutorial is here <a href="http://veereshr.com/Android/AndroidToServlet" target="_blank" rel="noopener noreferrer">link</a>
Error occurs on :
<code>OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());</code>
I checked that:
<ul>
<li>firewall is disabled</li>
<li>ping is working</li>
<li>connection string is exactly the same as when I run the servlet from server admin interface - <code>http://localhost:8080/Requestor/RQSRV</code>
-the servlet is running</li>
</ul>
My configuration :
<ul>
<li>Server : Glass Fish 4.0</li>
<li>Android App - Developed in Eclipse</li>
<li>Servlet - Developed in NetBeans</li>
</ul>

What I know is:

 - [`ReadLock`][2] and [`WriteLock`][1] affect each other somehow
 - `WriteLock` is just like *synchronized*
 - `ReadLock` seems cannot work alone

  [1]: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/locks/ReentrantReadWriteLock.WriteLock.html
  [2]: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/locks/ReentrantReadWriteLock.ReadLock.html

ReentrantReadWriteLock: what&#39;s the difference between ReadLock and WriteLock?

I&#39;m trying to slice a byte array to prune the first part of the array. I&#39;m using ByteBuffer but it does not behave like I would expect.

    byte[] myArray = new byte[10];
    ByteBuffer buf = ByteBuffer.wrap(myArray);
    buf.position(5);
    ByteBuffer slicedBuf = buf.slice();
    byte[] newArray = slicedBuf.array();

I would expect the size of newArray to be 5, containing only the last portion of my ByteBuffer. Instead, the full byte array is returned. I understand that this is because the &quot;backing buffer&quot; is the same all along. 

How can I slice to have only the desired part of the array?

EDIT: Added context

The bytes are received from network. The buffer is formed like this :

`[ SHA1 hash ] [ data...  lots of it ]`  

 I already have a function that takes a byte array as a parameter and calculate the SHA1 hash. What I want is to slice the full buffer to pass only the data without the expected hash.

Slicing byte arrays in Java

While reading the Java official tutorial about generics, I found that you can restrict the type argument (in this case is `T`) to extend a class and/or more interfaces with the &#39;and&#39; operator (`&amp;`) like this:

    &lt;T extends MyClass &amp; Serializable&gt;

I replaced the `&amp;` with `,` (by mistake and still works, with a minor warning).

My question is, is there any difference between these two:

    &lt;T extends MyClass &amp; Serializable&gt;
    &lt;T extends MyClass , Serializable&gt; // here is with comma

And the example method:

    static &lt;T extends MyClass &amp; Serializable&gt; ArrayList&lt;T&gt; fromArrayToCollection(T[] a) {
        ArrayList&lt;T&gt; arr = new ArrayList&lt;T&gt;();
        
        for (T o : a) {
            arr.add(o); // Correct
        }
        return arr;
    }
    




What is the difference between &#39;&amp;&#39; and &#39;,&#39; in Java generics?

I&#39;m stuck with a simple problem; struggling how to invoke `order by` on a `join`ed entity. Essentially I am trying to achieve the following with `JPA Criteria`:

    select distinct d from Department d 
	left join fetch d.children c 
	left join fetch c.appointments a
	where d.parent is null 
	order by d.name, c.name
	
I have the following:

    CriteriaBuilder cb = getEntityManager().getCriteriaBuilder();
    CriteriaQuery&lt;Department&gt; c = cb.createQuery(Department.class);
    Root&lt;Department&gt; root = c.from(Department.class);
    Fetch&lt;Department, Department&gt; childrenFetch = root.fetch(
		Department_.children, JoinType.LEFT);
    childrenFetch.fetch(Department_.appointments, JoinType.LEFT);

    c.orderBy(cb.asc(root.get(Department_.name)));
    c.distinct(true);
    c.select(root);
    c.where(cb.isNull(root.get(Department_.parent)));

How to achieve `order by d.name, c.name` with `Criteria API`? I tried with Expression&lt;Department&gt;, Path&lt;Department&gt; but didn&#39;t work.
Any pointers will be greatly appreciated.




JPA Criteria Query API and order by two columns

Each java application will run in a specific Java Virtual Machine Instance.  I am really getting confused on below aspects and Googling has confused me even more. Different articles on different sites.

1. If I have a web service written in java it will need a JVM instance to run.So can JVM be made a  daemon process?

2. If yes when we run any other java application it will use this instance of JVM or create a new one?

3. Main memory available in any machine is constant. When we start n java processes simultaneously without providing any initial heap size how is the heap size distributed among processes?

4. Is there any process that manages n number of JVM instances or is it managed by OS itself?

5. When stop-the-world  happens during an GC are other JVM instances(different threads I assume) affected?

When multiple java programs run on the same machine

I&#39;m using the Google `DrawerLayout`.

When an item gets clicked, the drawer is smoothly closed and an `Activity` will be launched. Turning these activities into `Fragment`s is *not* an option. Because of this, launching an activity and then closing the drawer is also not an option. Closing the drawer and launching the activity at the same time will make the closing animation stutter.

Given that I want to smoothly close it first, and then launch the activity, I have a problem with the latency between when a user clicks on the drawer item, and when they see the activity they wanted to go to.

This is what the click listener for each item looks like.

    final View.OnClickListener mainItemClickListener = new View.OnClickListener() {
        @Override
        public void onClick(final View v) {
            mViewToLaunch = v;
            mDrawerLayout.closeDrawers();
        }
    };

My activity is also the DrawerListener, its `onDrawerClosed` method looks like:

    @Override
    public synchronized void onDrawerClosed(final View view) {
        if (mViewToLaunch != null) {
            onDrawerItemSelection(mViewToLaunch);
            mViewToLaunch = null;
        }
    }

`onDrawerItemSelection` just launches one of the five activities.

I do nothing on `onPause` of the `DrawerActivity`.

I am instrumenting this and it takes on average from 500-650ms from the moment onClick is called, to the moment onDrawerClosed ends.

There is a noticeable lag, once the drawer closes, before the corresponding activity is launched.

I realize a couple of things are happening:

* The closing animation takes place, which is a couple of milliseconds right there (let&#39;s say 300). 

* Then there&#39;s probably some latency between the drawer visually closing and its listener getting fired. I&#39;m trying to figure out exactly how much of this is happening [by looking at `DrawerLayout` source][1] but haven&#39;t figured it out yet.

* Then there&#39;s the amount of time it takes for the launched activity to perform its startup lifecycle methods up to, and including, `onResume`. I have not instrumented this yet but I estimate about 200-300ms.

This seems like a problem where going down the wrong path would be quite costly so I want to make sure I fully understand it.

One solution is just to skip the closing animation but I was hoping to keep it around.

How can I decrease my transition time as much as possible?

[1]:http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.3_r2.1/android/support/v4/widget/DrawerLayout.java#DrawerLayout.0mListener

Optimizing drawer and activity launching speed

I wrote android code that shows a pop-up dialog but I want to change the background color from black to white , and then the color of the writing.

This is the dialog&#39;s code: 

    mPrefs = PreferenceManager.getDefaultSharedPreferences(this);

        Boolean welcomeScreenShown = mPrefs.getBoolean(welcomeScreenShownPref, false);

        if (!welcomeScreenShown) {


            String whatsNewText = getResources().getString(R.string.Text);
            new AlertDialog.Builder(this).setMessage(whatsNewText).setPositiveButton(
                    R.string.ok, new DialogInterface.OnClickListener(){
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            }).show();
            SharedPreferences.Editor editor = mPrefs.edit();
            editor.putBoolean(welcomeScreenShownPref, true);
            editor.commit(); // Very important to save the preference
        }

Change the background color of a pop-up dialog

I have an android layout which has a `scrollView` with a number of elements with in it. At the bottom of the `scrollView` I have a `listView` which is then populated by an adapter.

The problem that I am experiencing, is that android is excluding the `listView` from the `scrollView` as the `scrollView` already has a scroll-able function.  I want the `listView` to be as long as the content is and for the master scroll view to be scroll-able.

How can I achieve this behavior?

Here is my main layout:

    &lt;ScrollView
        android:id=&quot;@+id/scrollView1&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;0dp&quot;
        android:layout_weight=&quot;2&quot;
        android:fillViewport=&quot;true&quot;
        android:gravity=&quot;top&quot; &gt;

        &lt;LinearLayout
            android:id=&quot;@+id/foodItemActvity_linearLayout_fragments&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:orientation=&quot;vertical&quot; &gt;
        &lt;/LinearLayout&gt;
        
    &lt;/ScrollView&gt;

I then programmatically add my components to the linearlayour with the id: `foodItemActvity_linearLayout_fragments`.  Below is one of the views that is loaded into that linearlayout. This is the one giving me trouble with the scrolls.


    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:orientation=&quot;vertical&quot; &gt;

        &lt;TextView
           android:id=&quot;@+id/fragment_dds_review_textView_label&quot;
           android:layout_width=&quot;wrap_content&quot;
           android:layout_height=&quot;wrap_content&quot;
           android:text=&quot;Reviews:&quot;
           android:textAppearance=&quot;?android:attr/textAppearanceMedium&quot; /&gt;

       &lt;ListView
           android:id=&quot;@+id/fragment_dds_review_listView&quot;
           android:layout_width=&quot;match_parent&quot;
           android:layout_height=&quot;wrap_content&quot;&gt;
       &lt;/ListView&gt;
    &lt;/LinearLayout&gt;


My adapter then fills up this list view.

Here is an image from the android hierarchy viewer when I click on the master scrollView:

[![Android List View inside a scroll view][1]][1]


As you can see, it is excluding the reviews listView.
    
I should be able to scroll the page down and see 8 reviews, but instead it only shows me those 3, and I can scroll on the tiny part where the reviews are. I want a global page scroll


  [1]: https://i.stack.imgur.com/3Gsoj.jpg

Android list view inside a scroll view

I need to view my SQLite db but I don&#39;t know how to do it. I&#39;ve gone to http://www.sqlite.org/download.html and downloaded the command line shell for my OS, but when I run the program and type `adb ...` I get errors.

Note: I&#39;m using Android Studio so I&#39;m assuming I don&#39;t need to install anything extra because I recall Android Studio said it had all the SDK tools needed.

How to use ADB in Android Studio to view an SQLite DB

Platform:4.3

API Level:18

AndroidManifest.xml:

    &lt;uses-sdk
        android:minSdkVersion=&quot;18&quot;
        android:targetSdkVersion=&quot;18&quot; /&gt;

values-v14\styles.xml:

      &lt;resources&gt;

    &lt;!--
        Base application theme for API 14+. This theme completely replaces
        AppBaseTheme from BOTH res/values/styles.xml and
        res/values-v11/styles.xml on API 14+ devices.
    --&gt;
    &lt;style name=&quot;AppBaseTheme&quot; parent=&quot;android:Theme.Holo.Light&quot;&gt;
    &lt;/style&gt;
    
     &lt;style name=&quot;CustomActionBarTheme&quot;
           parent=&quot;@style/Theme.Holo.Light.DarkActionBar&quot;&gt;
        &lt;item name=&quot;android:actionBarStyle&quot;&gt;@style/MyActionBar&lt;/item&gt;
    &lt;/style&gt;

    &lt;style name=&quot;MyActionBar&quot;
           parent=&quot;@style/Widget.Holo.Light.ActionBar.Solid.Inverse&quot;&gt;
        &lt;item name=&quot;android:background&quot;&gt;@drawable/actionbar_background&lt;/item&gt;
    &lt;/style&gt;
 
&lt;/resources&gt;

I am an android newbie.Thanks very much!



No resource found that matches the given name &#39;@style/ Theme.Holo.Light.DarkActionBar&#39;

I&#39;m working on a program that uses the Google API. However every time I run my program, it I keeps getting the following error:  

&gt;Could not load file or assembly &#39;System.Net.Http.Primitives, Version=1.5.0.0, Culture=neutral, PublicKeyToken=b03f5f711d50a3a&#39; or one of its dependencies. The located assembly&#39;s manifest definition does not match the assembly reference. &lt;Exception from HRESULT: 0x880131040&gt;


I&#39;m using Visual Studio 2012 express. I&#39;ve tried following this [link][1] and looked through many forums, but none seem to work. The main problem seems to come from the DLL file &quot;Google.Apis.dll&quot; which I referenced, and it references System.Net.Http.Primitives v1.5.0.0. However the version my program references is 2.2.13.0. I&#39;ve tried having the program reference v1.5.0.0 instead (I manage to find the dll along with the source code of Google.Apis) however this only caused another problem in which I needed a more recent version of System.Net.Http.Primitives. 

I&#39;m been trying find a way to work around this, however I can&#39;t seem to find anything that works. Thank you for time.


  [1]: https://code.google.com/p/google-api-dotnet-client/wiki/Build

Could not load file or assembly System.Net.Http.Primitives. Located assembly&#39;s manifest definition does not match the assembly reference

I have been coding in Java for a while now. But sometimes, I don&#39;t understand when I should throw the exception and when should I catch the exception. I am working on a project in which there are lot of methods. The hierarchy is something like this-

    Method A will call Method B and Method B will call some Method C and Method C will call Method D and Method E.
	
So currently what I am doing is- I am throwing exceptions in all the methods and catching it in Method A and then logging as an error.

But I am not sure whether this will be the right way to do it? Or should I start catching exceptions in all the Methods. So that is why this confusion started in my- When should I catch the Exception vs When should I throw the exceptions. I know it&#39;s a silly question but somehow I am struggling to understand this major concept.

Can someone give me a detailed example of `When to catch the Exception vs When to throw the Exceptions` so that my concepts gets cleared on this? And in my case, should I keep on throwing the exception and then catch it in the main calling Method A?


When to catch the Exception vs When to throw the Exceptions?

I&#39;ve been interviewed recently and the interviewer wanted me to do a technical test to see my knowledge. After I finished it he gave me feedback about how I did it, which I didn&#39;t expect and I appreciated, since few interviewers do it if they don&#39;t want to hire you.

One of the things he told me that he saw bad about my code was that I used more than one try-catch block inside each method I wrote. This calls my attention since I see it interesting. 

I believe at the moment that I should make try-catch blocks where there is a semantically distinguishable block of code which has one or more methods that can throw exceptions needed to be caught. The only exception to this that I followed was that if two methods throw the same exception type, I better put them in different try-catch blocks to clearly distinguish when debugging where and why an exception was thrown. 

This strongly differs from what the interviewer wanted me to do. So is using just one try-catch block per method a known good practice? If it is a known good practice what are the benefits of doing it?

---

Please note that I would like to know if this is a known good practice. I.e. if most programmers/authors would agree that this is a good practice.

Is it a known good practice to use a big try-catch per method in java?

This is very odd to me. `RuntimeException` inherits from `Exception`, which inherits from `Throwable`.

    catch(Exception exc) { /* won&#39;t catch RuntimeException */

but

    catch(Throwable exc) { /* will catch RuntimeException */

I know `RuntimeException` is special in that it&#39;s unchecked. But to my understanding that applies just to whether exceptions have to be declared, not whether they are caught. And even then, I don&#39;t know why this logic would break on catching `Throwable`.

This is pretty relevant to me since I have a situation where `RuntimeException` can be thrown in a terminal operation. I&#39;m not sure the name for this pattern, but something like, my class `EmailRoller` takes an array of `Callbacks`. The code looks like this:

    for(Callback cb : callbacks) {
        try {
            cb.call(item);
        }
        catch(Exception exc) {
            logger.error(&quot;Error in callback: &quot;, exc);
       }
    }

So this is a case where something like an OOME needs to fly through, because if one of these callbacks consumes all machine memory, that sure as heck is going to affect the running of the other ones. But a `NullPointerException`? Or an `IndexOutOfBoundsException`? Those will affect the callback but won&#39;t prevent the others from running.

Also, this is a bit of an enterprise design. Different programmers or teams can add callbacks to process the item, but they should be isolated from each other. This means, as the programmer responsible for insulating these callbacks from each other, I shouldn&#39;t rely on them to make sure errors don&#39;t slip through. Catching `Exception` should be about the right line, but it isn&#39;t because `RuntimeException` slips through. So my more general question is: what&#39;s a good pattern here? Just `catch(Exception | RuntimeException exc)`, which I believe is a syntax error because of the inheritance?

How to explain whether Exception will catch RuntimeException?

How can exceptions be tested in a nice way (e.g. data tables) with Spock?

Example: Having a method `validateUser` that can throw exceptions with different messages or no exception if the user is valid.

The specification class itself:

    class User { String userName }
    
    class SomeSpec extends spock.lang.Specification {

        ...tests go here...

        private validateUser(User user) {
            if (!user) throw new Exception (&#39;no user&#39;)
            if (!user.userName) throw new Exception (&#39;no userName&#39;)
        }
    }


**Variant 1**

This one is working but the real intention is cluttered by all the *when* / *then* labels and the repeated calls of `validateUser(user)`.

        def &#39;validate user - the long way - working but not nice&#39;() {
            when:
            def user = new User(userName: &#39;tester&#39;)
            validateUser(user)
    
            then:
            noExceptionThrown()
    
            when:
            user = new User(userName: null)
            validateUser(user)
    
            then:
            def ex = thrown(Exception)
            ex.message == &#39;no userName&#39;
    
            when:
            user = null
            validateUser(user)
    
            then:
            ex = thrown(Exception)
            ex.message == &#39;no user&#39;
        }


**Variant 2**

This one is not working because of this error raised by Spock at compile time:

*Exception conditions are only allowed in &#39;then&#39; blocks*

        def &#39;validate user - data table 1 - not working&#39;() {
            when:
            validateUser(user)
    
            then:
            check()
    
            where:
            user                         || check
            new User(userName: &#39;tester&#39;) || { noExceptionThrown() }
            new User(userName: null)     || { Exception ex = thrown(); ex.message == &#39;no userName&#39; }
            null                         || { Exception ex = thrown(); ex.message == &#39;no user&#39; }
        }


**Variant 3**

This one is not working because of this error raised by Spock at compile time:

*Exception conditions are only allowed as top-level statements*

        def &#39;validate user - data table 2 - not working&#39;() {
            when:
            validateUser(user)
    
            then:
            if (expectedException) {
                def ex = thrown(expectedException)
                ex.message == expectedMessage
            } else {
                noExceptionThrown()
            }
    
            where:
            user                         || expectedException | expectedMessage
            new User(userName: &#39;tester&#39;) || null              | null
            new User(userName: null)     || Exception         | &#39;no userName&#39;
            null                         || Exception         | &#39;no user&#39;
        }


Spock - Testing Exceptions with Data Tables

I have this piece of code:

    resp.addHeader(&quot;Content-Disposition&quot;, &quot;inline; filename=&quot; + fileName);

When the file name is &quot;a_b_c.doc&quot; or &quot;abc.doc&quot; the name of the downloaded file is displayed correctly. However, when the file name is &quot;a b c .doc&quot; the name of the downloaded file is only &quot;a&quot;.

How can we solve this? 

How to set filename containing spaces in Content-Disposition header

I read [here][1] that one should not save the file in the server anyway as it is not portable, transactional and requires external parameters. However, given that I need a tmp solution for tomcat (7) and that I have (relative) control over the server machine I want to know :

 - What is the best place to save the file ? Should I save it in `/WEB-INF/uploads` (advised against [here][2]) or someplace under `$CATALINA_BASE` (see [here][3]) or ... ? The JavaEE 6 tutorial [gets the path from the user][4] (:wtf:). NB : The file should not be downloadable by any means.
   
 - Should I set up a config parameter as detailed [here][5] ? I&#39;d appreciate some code (I&#39;d rather give it a relative path - so it is at least Tomcat portable) - [`Part.write()`][6] looks promising - but apparently needs a absolute path

 - I&#39;d be interested in an exposition of the disadvantages of this approach vs a database/JCR repository one

Unfortunately the [FileServlet][7]  by @BalusC concentrates on downloading files, while his [answer][8] on uploading files skips the part on where to save the file.

A solution easily convertible to use a DB or a JCR implementation (like [jackrabbit][9]) would be preferable.


  [1]: https://stackoverflow.com/a/2663855/281545
  [2]: https://stackoverflow.com/a/13617442/281545
  [3]: https://stackoverflow.com/a/1047581/281545
  [4]: http://docs.oracle.com/javaee/6/tutorial/doc/glraq.html#gmhbq
  [5]: https://stackoverflow.com/a/2663250/281545
  [6]: http://docs.oracle.com/javaee/6/api/javax/servlet/http/Part.html#write%28java.lang.String%29
  [7]: http://balusc.blogspot.gr/2009/02/fileservlet-supporting-resume-and.html
  [8]: https://stackoverflow.com/a/2424824/281545
  [9]: http://jackrabbit.apache.org/frequently-asked-questions.html

Recommended way to save uploaded files in a servlet application

Could you help me write spring mvc style analog of this code?
   

     session.setAttribute(&quot;name&quot;,&quot;value&quot;);

And how to add an element that is annotated by `@ModelAttribute` annotation to session and then get access to it?


How to use Session attributes in Spring-mvc

I can&#39;t get tomcat7 to compile jsps. It till run the example servlets just fine and the service is up and running. I am running oracle java 8.

Can anyone point me in the right direction?

Here is the stacktrace:

    type Exception report
    
    message Unable to compile class for JSP:
    
    description The server encountered an internal error that prevented it from fulfilling this request.
    
    exception
    
    org.apache.jasper.JasperException: Unable to compile class for JSP: 
    
    An error occurred at line: 1 in the generated java file
    The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files
    
    Stacktrace:
    	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
    	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:331)
    	org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:468)
    	org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
    	org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
    	org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
    	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
    	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    	javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    note The full stack trace of the root cause is available in the Apache Tomcat/7.0.35 logs.

---

The code looks like this and it&#39;s the sample code from tomcat7 so my guess is that it&#39;s correct. 

    &lt;%@ taglib prefix=&quot;mytag&quot; uri=&quot;/WEB-INF/jsp2/jsp2-example-taglib.tld&quot; %&gt;
    &lt;html&gt;
    &lt;head&gt;
      &lt;title&gt;JSP 2.0 Examples - Hello World SimpleTag Handler&lt;/title&gt;
    &lt;/head&gt;
    &lt;body&gt;
    &lt;h1&gt;JSP 2.0 Examples - Hello World SimpleTag Handler&lt;/h1&gt;
    &lt;hr&gt;
    &lt;p&gt;This tag handler simply echos &quot;Hello, World!&quot;  It&#39;s an example of
    a very basic SimpleTag handler with no body.&lt;/p&gt;
    &lt;br&gt;
    &lt;b&gt;&lt;u&gt;Result:&lt;/u&gt;&lt;/b&gt;
    &lt;mytag:helloWorld/&gt;
    &lt;/body&gt;
    &lt;/html&gt;


Unable to compile class for JSP: The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files

I&#39;m working on a Java EE web application with the following source code directory structure:

&lt;!-- language: lang-none --&gt;

    src/main/java                 &lt;-- multiple packages containing Java classes
    src/test/java                 &lt;-- multiple packages containing JUnit tests
    src/main/resources            &lt;-- includes properties files for textual messages
    src/main/webapp/resources     &lt;-- includes CSS, images and all Javascript files
    src/main/webapp/WEB-INF
    src/main/webapp/WEB-INF/tags
    src/main/webapp/WEB-INF/views

The folder I&#39;m interested in is `WEB-INF`: It contains `web.xml`, XML files for setting up servlets, Spring bean wiring contexts and JSP tags and views. I&#39;m trying to understand what constrains/defines this structure. E.g. do JSP files always have to be within `WEB-INF` or could they be somewhere else? And is there anything else that might go in `WEB-INF`? Wikipedia&#39;s [WAR files](http://en.wikipedia.org/wiki/WAR_file_format_%28Sun%29) entry mentions `classes` for Java classes and `lib` for JAR files - not sure I&#39;ve fully grasped when these would be needed in addition to the other source file locations.

What is WEB-INF used for in a Java EE web application?

I&#39;m a node.js developer who creates web apps using express.js.
By now, my problem is:

Whenever I create an app on my computer, npm install its stuff and run it (with node app.js and nodemon) I get this message in the console:

    connect.multipart() will be removed in connect 3.0
    visit https://github.com/senchalabs/connect/wiki/Connect-3.0 for alternatives
    connect.limit() will be removed in connect 3.0
    Express server listening on port 3000

The app works, that&#39;s fine. But when I clone an app created in other computer I don&#39;t get that message, so I&#39;m supposing I have something outdated in my computer.

I went to the site mentioned in the message and confirmed my speculations. That is a deprecation warning. However, I&#39;ve updated node and npm and globally express but I still getting the note. 

My problem is, therefore: I don&#39;t know what do I need to update in order to get rid of the deprecation notes because they&#39;re freaking me out. 

I hope someone can help me. 
Thanks a lot. 

How to get rid of Connect 3.0 deprecation alert?

I am new with ```Express```. As ```Express 4.x``` has removed bundled middlewares.
Any middleware I want to use should be required. When I read the README with [express-session][1] and [cookie-session][2] on github, I feel it hard to understand the difference.

So I try to write simple code to figure it out. I run twice for each middleware.

    var express = require(&#39;express&#39;)
	  , cookieParser = require(&#39;cookie-parser&#39;)
	  , session = require(&#39;cookie-session&#39;)
	  , express_sess = require(&#39;express-session&#39;)
	  , app = express();

	app.use(cookieParser())
	app.use(session({ keys: [&#39;abc&#39;], name: &#39;user&#39; }));
	//app.use(express_sess({ secret: &#39;abc&#39;, key: &#39;user&#39;}));
	app.get(&#39;/&#39;, function (req, res, next) {
		res.end(JSON.stringify(req.cookies));
		console.log(req.session)
		console.log(req.cookies)
	});

	app.listen(3000);

For ```cookie-session```, I always get {} in my terminal.

For ```express-session```, I get things like this.

    req.session: { cookie: { 
         path: &#39;/&#39;,
         _expires: null,
         originalMaxAge: null,
         httpOnly: true 
       } 
    }

    req.cookie: {user: &#39;s:aJ97vKA5CCwxqdTj0AV1siRQ.fWusS5+qfCKICtwkfrzcZ/Gq8P0Qdx/kx8mTBhoOhGU&#39;}

It really confuses me. So how to explain the result with the basic use? And what&#39;s the difference between them? When should I use them? 



  [1]: https://github.com/expressjs/session
  [2]: https://github.com/expressjs/cookie-session

What&#39;s difference with express-session and cookie-session?

NOTE: I have tried other solution given [here][1] but it didn&#39;t work

A newbie with NodeJs. I am trying to follow AngularJS pro and got stuck with setting up NodeJs server. According to book, I installed nodejs and then installed connect package using
npm install connect

then downloaded angularjs in folder next to nodejs folder. Then wrote server.js file to connect to server. Here is the content of the file:

        var connect = require(&#39;connect&#39;);
    connect.createServer(connect.static(&quot;../angularjs&quot;)).listen( 5000);


  When I run this server.js file using: 

    node server.js

I get following error:

     function app(req, res, next){ app.handle(req, res, next); }
     merge(app, proto);
     merge(app, EventEmitter.prototype);
     app.route = &#39;/&#39;;
     app.stack = [];
     return app;
     has no method &#39;static&#39;
       at Object.&lt;anonymous&gt; (C:\web\nodejs\server.js:2:36)
       at Module._compile (module.js:456:26)
       at Object.Module._extensions..js (module.js:474:10)
       at Module.load (module.js:356:32)
       at Function.Module._load (module.js:312:12)
       at Function.Module.runMain (module.js:497:10)
       at startup (node.js:119:16)
       at node.js:906:3
    
    
  [1]: https://stackoverflow.com/questions/23978734/node-connect-issue-object-function-createserver-has-no-method-static

Any ideas guys?
Thanks.


nodejs connect cannot find static

Can someone please tell me the recommended (up to date) way to get POSTed form data in express.

So many tutorials/ posts etc talk about bodyParser but this is no longer bundled with Express and other blogs etc recommend using urlencoded directly, but now this is not available either.

Trying to find accurate information on these frameworks or technologies is doing my head in.

BTW what I am intrerested in is very simple and small form data



Content Type	Original Author	Original Content on Stackoverflow
Question	Ján Srniček	View Question on Stackoverflow
Solution 1 - Java	laalto	View Answer on Stackoverflow
Solution 2 - Java	Rahul pawar	View Answer on Stackoverflow

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