    void myRoutine() throws SpecificException { 
        try {
            methodThrowingDifferentExceptions();
        } catch (SpecificException se) {
            throw se;
        } catch (Exception e) {
            //default routine for all other exceptions
        }
    }

you can do like this

    try {
        methodThrowingDifferentExceptions();    
    } catch (Exception e) {
        if(e instanceof SpecificException){
          throw e;
        }
    }

I need to execute part of a bash script as a different user, and inside that user&#39;s `$HOME` directory. However, I&#39;m not sure how to determine this variable. Switching to that user and calling `$HOME` does not provide the correct location:

    # running script as root, but switching to a different user...
    su - $different_user
    echo $HOME
    # returns /root/ but should be /home/myuser

### Update:

It appears that the issue is with the way that I am trying to switch users in my script:

    $different_user=deploy

    # create user
    useradd -m -s /bin/bash $different_user

    echo &quot;Current user: `whoami`&quot;
    # Current user: root
    
    echo &quot;Switching user to $different_user&quot;
    # Switching user to deploy
    
    su - $different_user
    echo &quot;Current user: `whoami`&quot;
    # Current user: root
    echo &quot;Current user: `id`&quot;
    # Current user: uid=0(root) gid=0(root) groups=0(root)
    
    sudo su $different_user
    # Current user: root
    # Current user: uid=0(root) gid=0(root) groups=0(root)

What is the correct way to switch users and execute commands as a different user in a bash script?

How to get $HOME directory when switching to a different user in bash?

I&#39;m using 2 dlls (`Microsoft.Expression.Interactions.dll` and `System.Windows.Interactivity.dll`) that, when the parent application is compiled, create loads of culture folders:
![][1]

And inside each are 2 dlls (`Microsoft.Expression.Interactions.resources.dll` and `System.Windows.Interactivity.resources.dll`). I&#39;ve googled around and I just can&#39;t find anything related to how to stop this annoying auto-generated content.


  [1]: http://i.stack.imgur.com/psNj2.png

Disable Dll Culture Folders on Compile

Is it possible to catch all exceptions of a method, except for a specific one, which should be thrown?

    void myRoutine() throws SpecificException {	
    	try {
    		methodThrowingDifferentExceptions();
    	} catch (SpecificException) {
    		//can I throw this to the next level without eating it up in the last catch block?
    	} catch (Exception e) {
    		//default routine for all other exceptions
    	}
    }

/Sidenote: the marked &quot;duplicate&quot; has nothing to do with my question!

How to catch all exceptions except a specific one?

Is it possible to catch all exceptions of a method, except for a specific one, which should be thrown?
<pre><code class="hljs language-csharp">void myRoutine() throws SpecificException {	
	try {
		methodThrowingDifferentExceptions();
	} catch (SpecificException) {
		//can I throw this to the next level without eating it up in the last catch block?
	} catch (Exception e) {
		//default routine for all other exceptions
	}
}
</code></pre>
/Sidenote: the marked "duplicate" has nothing to do with my question!

Is there a Utility method somewhere that can do this in 1 line? I can&#39;t find it anywhere in `Collections`, or `List`.

    public List&lt;String&gt; stringToOneElementList(String s) {
        List&lt;String&gt; list = new ArrayList&lt;String&gt;();
        list.add(s);
        return list;
    }

I don&#39;t want to re-invent the wheel unless I plan on putting fancy rims on it.

Well... the type can be `T`, and not `String`. but you get the point. (with all the null checking, safety checks...etc)

How to quickly and conveniently create a one element arraylist

I want to translate a List of objects into a Map using Java 8&#39;s streams and lambdas.

This is how I would write it in Java 7 and below.

    private Map&lt;String, Choice&gt; nameMap(List&lt;Choice&gt; choices) {
            final Map&lt;String, Choice&gt; hashMap = new HashMap&lt;&gt;();
            for (final Choice choice : choices) {
                hashMap.put(choice.getName(), choice);
            }
            return hashMap;
    }

I can accomplish this easily using Java 8 and Guava but I would like to know how to do this without Guava.

In Guava:

    private Map&lt;String, Choice&gt; nameMap(List&lt;Choice&gt; choices) {
        return Maps.uniqueIndex(choices, new Function&lt;Choice, String&gt;() {
    
            @Override
            public String apply(final Choice input) {
                return input.getName();
            }
        });
    }
    

And Guava with Java 8 lambdas.

    private Map&lt;String, Choice&gt; nameMap(List&lt;Choice&gt; choices) {
        return Maps.uniqueIndex(choices, Choice::getName);
    }



Java 8 List&lt;V&gt; into Map&lt;K, V&gt;

I have got a problem with my page jump when I use JAVA,
if I use:

    response.sendRedirect(&quot;login.jsp&quot;)

 then I get this url: `http://localhost:8080/login.jsp`

But if I use 

    request.getRequestDispathcer(&quot;login.jsp&quot;).forward(request, response)

 then I get this url: `http://localhost:8080/Shopping/login.jsp` (the &quot;Shopping&quot; is the name of my module).

What&#39;s the difference?

What is the difference between response.sendRedirect() and request.getRequestDispatcher().forward(request,response)

I&#39;ve received this quiz on an online form to apply for a recent Java event in my city:

    //Instead of this comment what code should be written so you can get &quot;Gotcha!&quot; printed
    if( a == a ){
      System.out.println(&quot;Not yet...&quot;);
    } else {
      System.out.println(&quot;Gotcha!&quot;);
    }

*AFAIK: the `==` comparison in Java on objects checks if both objects are the same in memory, and overwriting the `equals` method doesn&#39;t overwrite the `==` operator like C++ and other languages that allow operator overloading*

I tried to change `a` value with the following features in Java and none of them got me what I wanted:

 1. transient variable
 2. target annotation
 3. garbage collector
 4. mutable objects

What should I do to get the `a` object to be different from itself?

How can a Java variable be different from itself?

With Java 8 and lambdas it&#39;s easy to iterate over collections as streams, and just as easy to use a parallel stream. Two examples from [the docs][1], the second one using parallelStream:

    myShapesCollection.stream()
        .filter(e -&gt; e.getColor() == Color.RED)
        .forEach(e -&gt; System.out.println(e.getName()));

    myShapesCollection.parallelStream() // &lt;-- This one uses parallel
        .filter(e -&gt; e.getColor() == Color.RED)
        .forEach(e -&gt; System.out.println(e.getName()));

As long as I don&#39;t care about the order, would it always be beneficial to use the parallel? One would think it is faster dividing the work on more cores.

Are there other considerations? When should parallel stream be used and when should the non-parallel be used?

&lt;sup&gt;(This question is asked to trigger a discussion about how and when to use parallel streams, not because I think always using them is a good idea.)&lt;/sup&gt;

  [1]: http://docs.oracle.com/javase/tutorial/collections/interfaces/collection.html


Should I always use a parallel stream when possible?

Why `std::vector`&#39;s `operator[]`, `front` and `back` member functions are not specified as `noexcept`?

Why vector access operators are not specified as noexcept?

I often see comments on other Stack Overflow questions about how the use of `except: pass` is discouraged. Why is this bad? Sometimes I just don&#39;t care what the errors are and I want to just continue with the code.

    try:
        something
    except:
        pass

Why is using an `except: pass` block bad? What makes it bad? Is it the fact that I `pass` on an error or that I `except` any error?

Why is &quot;except: pass&quot; a bad programming practice?

I&#39;m using Square&#39;s [Tape][1] library to queue uploads of data to the server. 

The queue is stored in File in JSON format. When the app starts I init the queue and start uploading (i.e if on Wifi)  However on some devices on users I&#39;m seeing `EOFException` with `&#39;null&#39;` message (logged in crashlytics). 

The error occurs when creating a `FileObjectQueue` object from an existing file - from the debug info gather the actual file is ~1MB. 

Any ideas what&#39;s causing this or how to prevent it? - maybe I need to dust up on my java.io.

**Edit: using Tape v1.2.1**


    Caused by: java.io.EOFException
    at java.io.RandomAccessFile.readFully(RandomAccessFile.java:419)
    at java.io.RandomAccessFile.readInt(RandomAccessFile.java:439)
    at com.squareup.tape.QueueFile.readElement(:182)
    at com.squareup.tape.QueueFile.readHeader(:162)
    at com.squareup.tape.QueueFile.(:110)
    at com.squareup.tape.FileObjectQueue.(:35)
    at com.myapp.queue.MyUploadTaskQueue.create(:125)

**Updated** - Also seeing this error since upgrading to 1.2.2

    Caused by: java.io.IOException: File is corrupt; length stored in header is 0.
           at com.squareup.tape.QueueFile.readHeader(:165)
           at com.squareup.tape.QueueFile.&lt;init&gt;(:117)
           at com.squareup.tape.FileObjectQueue.&lt;init&gt;(:35)



  [1]: https://github.com/square/tape

EOFException when reading QueueFile tape

I want to test that `MyException` is thrown in a certain case. `EXPECT_THROW` is good here. But I also want to check the exception has a specific state e.g `e.msg() == &quot;Cucumber overflow&quot;`.

How is this best implemented in GTest?

Test a specific exception type is thrown AND the exception has the right properties

I&#39;m getting this exception:

&gt; The parameterized query &#39;(@Name nvarchar(8),@type nvarchar(8),@units nvarchar(4000),@rang&#39; expects the parameter &#39;@units&#39;, which was not supplied.

My code for inserting is:

    public int insertType(string name, string type, string units = &quot;N\\A&quot;, string range = &quot;N\\A&quot;, string scale = &quot;N\\A&quot;, string description = &quot;N\\A&quot;, Guid guid = new Guid())
    {
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            connection.Open();
            SqlCommand command = new SqlCommand();
            command.CommandText = &quot;INSERT INTO Type(name, type, units, range, scale, description, guid) OUTPUT INSERTED.ID VALUES (@Name, @type, @units, @range, @scale, @description, @guid) &quot;;
            command.Connection = connection;
            command.Parameters.AddWithValue(&quot;@Name&quot;, name);
            command.Parameters.AddWithValue(&quot;@type&quot;, type);
            command.Parameters.AddWithValue(&quot;@units&quot;, units);
            command.Parameters.AddWithValue(&quot;@range&quot;, range);
            command.Parameters.AddWithValue(&quot;@scale&quot;, scale);
            command.Parameters.AddWithValue(&quot;@description&quot;, description);
            command.Parameters.AddWithValue(&quot;@guid&quot;, guid);
            return (int)command.ExecuteScalar();
        }
    }

The exception was a surprise because I&#39;m using the `AddWithValue` function and making sure I added a default parameters for the function. 


SOLVED:

The problem was that the some parameters where empty Strings (that override the default)

This is the working code: 

    public int insertType(string name, string type, string units = &quot;N\\A&quot;, string range = &quot;N\\A&quot;, string scale = &quot;N\\A&quot;, string description = &quot;N\\A&quot;, Guid guid = new Guid())
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();
                SqlCommand command = new SqlCommand();
                command.CommandText = &quot;INSERT INTO Type(name, type, units, range, scale, description, guid) OUTPUT INSERTED.ID VALUES (@Name, @type, @units, @range, @scale, @description, @guid) &quot;;
                command.Connection = connection;
                command.Parameters.AddWithValue(&quot;@Name&quot;, name);
                command.Parameters.AddWithValue(&quot;@type&quot;, type);

                if (String.IsNullOrEmpty(units))
                {
                    command.Parameters.AddWithValue(&quot;@units&quot;, DBNull.Value); 
                }
                else
                    command.Parameters.AddWithValue(&quot;@units&quot;, units);
                if (String.IsNullOrEmpty(range))
                {
                    command.Parameters.AddWithValue(&quot;@range&quot;, DBNull.Value);
                }
                else
                    command.Parameters.AddWithValue(&quot;@range&quot;, range);
                if (String.IsNullOrEmpty(scale))
                {
                    command.Parameters.AddWithValue(&quot;@scale&quot;, DBNull.Value);
                }
                else
                    command.Parameters.AddWithValue(&quot;@scale&quot;, scale);
                if (String.IsNullOrEmpty(description))
                {
                    command.Parameters.AddWithValue(&quot;@description&quot;, DBNull.Value);
                }
                else
                    command.Parameters.AddWithValue(&quot;@description&quot;, description);
                
                
                
                
                command.Parameters.AddWithValue(&quot;@guid&quot;, guid);


                return (int)command.ExecuteScalar();
            }
            
            
        }

Content Type	Original Author	Original Content on Stackoverflow
Question	membersound	View Question on Stackoverflow
Solution 1 - Java	Dodd10x	View Answer on Stackoverflow
Solution 2 - Java	Prabhakaran Ramaswamy	View Answer on Stackoverflow

How to catch all exceptions except a specific one?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Disable Dll Culture Folders on Compile

How to get $HOME directory when switching to a different user in bash?

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