&gt; Does ByteArrayOutputStream.close()
&gt; really release the memory?

No. It does absolutely nothing. You can look at its source code:

    public void close() throws IOException {
    }

To release the memory, make sure there are no references to it and let the Garbage Collector do its thing. Just like with any other normal object.

File- and Socket-based streams are special because they use non-memory OS resources (file handles) that you can run out of independantly of memory. That&#39;s why closing them explicitly is important. But this does not apply to the purely memory-based `ByteArrayOutputStream`.

With the new [sparse checkout feature][1] in Git 1.7.0, is it possible to just get the contents of a subdirectory like how you can in SVN? I found [this example][2], but it preserves the full directory structure. Imagine that I just wanted the contents of the &#39;perl&#39; directory, without an actual directory named &#39;perl&#39;.

**-- EDIT --**

Example:

My git repository contains the following paths

    repo/.git/
    repo/perl/
    repo/perl/script1.pl
    repo/perl/script2.pl
    repo/images/
    repo/images/image1.jpg
    repo/images/image2.jpg
    repo/doc/
    repo/doc/readme.txt
    repo/doc/help.txt

What I want is to be able to produce from the above repository this layout:

    repo/.git/
    repo/script1.pl
    repo/script2.pl

However with the current sparse checkout feature, it seems like it is only possible to get

    repo/.git/
    repo/perl/script1.pl
    repo/perl/script2.pl

which is NOT what I want.


  [1]: http://schacon.github.com/git/git-read-tree.html#_sparse_checkout
  [2]: http://vmiklos.hu/blog/sparse-checkout-example-in-git-1-7

Sparse checkout in Git 1.7.0?

I have this annoying mistake in some of my builds. 

There is no error in the project, because if I build again, then the problem disappears. The message only appears, when the site is deployed to a Windows 2008 Server. 

I first  thought that it might be an issue with temporary files, but thats not the case. I deployed the build to a different web and the error still appears. 

The error appears on random actions of the site. Most of the time builds are ok, but each 3rd or 4th build produces runtime errors.

I build using a WebdeploymentProject in release mode. Views are precompiled.

It&#39;s not https://stackoverflow.com/questions/178194/in-asp-net-mvc-i-encounter-an-incorrect-type-error-when-rendering-a-page-with-the, because views have totally different names.

How I can debug this problem or how I can get help for this?

Here is my WebDeploymentProject


		&lt;!-- 
		  Microsoft Visual Studio 2008 Web Deployment Project 
		  http://go.microsoft.com/fwlink/?LinkID=104956

		--&gt;
		&lt;Project ToolsVersion=&quot;3.5&quot; DefaultTargets=&quot;Build&quot; xmlns=&quot;http://schemas.microsoft.com/developer/msbuild/2003&quot;&gt;
		  &lt;PropertyGroup&gt;
		    &lt;Configuration Condition=&quot; &#39;$(Configuration)&#39; == &#39;&#39; &quot;&gt;Debug&lt;/Configuration&gt;
		    &lt;Platform Condition=&quot; &#39;$(Platform)&#39; == &#39;&#39; &quot;&gt;AnyCPU&lt;/Platform&gt;
		    &lt;ProductVersion&gt;9.0.21022&lt;/ProductVersion&gt;
		    &lt;SchemaVersion&gt;2.0&lt;/SchemaVersion&gt;
		    &lt;ProjectGuid&gt;{E5E14CEB-0BCD-4203-9A5A-34ABA9C717EA}&lt;/ProjectGuid&gt;
		    &lt;SourceWebPhysicalPath&gt;..\B2CWeb&lt;/SourceWebPhysicalPath&gt;
		    &lt;SourceWebProject&gt;{3E632DB6-6DB3-4BD0-8CCA-12DE67165B48}|B2CWeb\B2CWeb.csproj&lt;/SourceWebProject&gt;
		    &lt;SourceWebVirtualPath&gt;/B2CWeb.csproj&lt;/SourceWebVirtualPath&gt;
		    &lt;TargetFrameworkVersion&gt;v3.5&lt;/TargetFrameworkVersion&gt;
		  &lt;/PropertyGroup&gt;
		  &lt;PropertyGroup Condition=&quot; &#39;$(Configuration)|$(Platform)&#39; == &#39;Debug|AnyCPU&#39; &quot;&gt;
		    &lt;DebugSymbols&gt;true&lt;/DebugSymbols&gt;
		    &lt;OutputPath&gt;.\Debug&lt;/OutputPath&gt;
		    &lt;EnableUpdateable&gt;false&lt;/EnableUpdateable&gt;
		    &lt;UseMerge&gt;true&lt;/UseMerge&gt;
		    &lt;SingleAssemblyName&gt;B2CWeb_Build&lt;/SingleAssemblyName&gt;
		  &lt;/PropertyGroup&gt;
		  &lt;PropertyGroup Condition=&quot; &#39;$(Configuration)|$(Platform)&#39; == &#39;Release|AnyCPU&#39; &quot;&gt;
		    &lt;DebugSymbols&gt;false&lt;/DebugSymbols&gt;
		    &lt;OutputPath&gt;..\B2CWeb_Deploy\&lt;/OutputPath&gt;
		    &lt;EnableUpdateable&gt;false&lt;/EnableUpdateable&gt;
		    &lt;UseMerge&gt;true&lt;/UseMerge&gt;
		    &lt;SingleAssemblyName&gt;B2C_Web&lt;/SingleAssemblyName&gt;
		    &lt;ContentAssemblyName&gt;
		    &lt;/ContentAssemblyName&gt;
		    &lt;DeleteAppCodeCompiledFiles&gt;false&lt;/DeleteAppCodeCompiledFiles&gt;
		  &lt;/PropertyGroup&gt;
		  &lt;ItemGroup&gt;
		  &lt;/ItemGroup&gt;
		  &lt;Import Project=&quot;$(MSBuildExtensionsPath)\Microsoft\WebDeployment\v9.0\Microsoft.WebDeployment.targets&quot; /&gt;
		  &lt;!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
		       Other similar extension points exist, see Microsoft.WebDeployment.targets.
		  &lt;Target Name=&quot;BeforeBuild&quot;&gt;
		  &lt;/Target&gt;
		  &lt;Target Name=&quot;BeforeMerge&quot;&gt;
		  &lt;/Target&gt;
		  &lt;Target Name=&quot;AfterMerge&quot;&gt;
		  &lt;/Target&gt;
		  &lt;Target Name=&quot;AfterBuild&quot;&gt;
		  &lt;/Target&gt;
		  --&gt;
		&lt;/Project&gt;

**EDIT**

After some months this problem disapeared. I haven&#39;t had problems for over 1 year now. I guess the issue will strike again when nobody expects it.

**EDIT 2**

… for over 2 years now. I am such a lucky dude!

**EDIT 3**

I just read [an article on MSDN][1], and it sounds like the problem I had. I have debugging disabled, but still the compilation was &quot;sometimes wrong&quot;. The behaviour of the old provider could be the issue. But this is just guessing.

&gt; Very large pages containing long spans of HTML with no server blocks (e.g. &lt;%= %&gt;) can cause a stack overflow when debug compilation is enabled that will crash the application. Note that in our testing it’s taken a page that’s ~4x as large one that would’ve produced a similar issue in the old provider, but in this case it crashes the entire application, whereas with the old provider it just fails the offending page

  [1]: https://devblogs.microsoft.com/aspnet/enabling-the-net-compiler-platform-roslyn-in-asp-net-applications/

The model item passed into the dictionary is of type ‘mvc.Models.ModelA’ but this dictionary requires a model item of type ‘mvc.Models.ModelB‘

What does this statement, &quot;Closing a `ByteArrayOutputStream` has no effect&quot; (&lt;http://java.sun.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#close()&gt;) mean?

I want to make sure the memory in `ByteArrayOutputStream` gets released. Does `ByteArrayOutputStream.close()` really release the memory?

Thanks.

Closing a ByteArrayOutputStream has no effect?

What does this statement, "Closing a <code>ByteArrayOutputStream</code> has no effect" (&#x3C;<a href="http://java.sun.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#close()>" target="_blank" rel="noopener noreferrer">http://java.sun.com/javase/6/docs/api/java/io/ByteArrayOutputStream.html#close()></a>;) mean?
I want to make sure the memory in <code>ByteArrayOutputStream</code> gets released. Does <code>ByteArrayOutputStream.close()</code> really release the memory?
Thanks.

Is it possible to declare a method that will allow a variable number of parameters ?

What is the symbolism used in the definition that indicate that the method should allow a variable number of parameters?

**Answer:** varargs


Java variable number of arguments for a method

I&#39;d like to create some sort of `Producer/Consumer` threading app. But I&#39;m not sure what the best way to implement a queue between the two. 

So I&#39;ve some up with two ideas (both of which could be entirely wrong). I would like to know which would be better and if they both suck then what would be the best way to implement the queue. It&#39;s mainly my implementation of the queue in these examples that I&#39;m concerned about. I&#39;m extending a Queue class that is an in house class and is thread safe. Below are two examples with 4 classes each.

Main class-

    public class SomeApp
    {
        private Consumer consumer;
        private Producer producer;

        public static void main (String args[])
        {
            consumer = new Consumer();
            producer = new Producer();
        }
    } 

Consumer class-

    public class Consumer implements Runnable
    {
        public Consumer()
        {
            Thread consumer = new Thread(this);
            consumer.start();
        }

        public void run()
        {
            while(true)
            {
                //get an object off the queue
                Object object = QueueHandler.dequeue();
                //do some stuff with the object
            }
        }
    }

Producer class-

    public class Producer implements Runnable
    {
        public Producer()
        {
            Thread producer = new Thread(this);
            producer.start();
        }

        public void run()
        {
            while(true)
            {
                //add to the queue some sort of unique object
                QueueHandler.enqueue(new Object());
            }
        }
    }

Queue class-

    public class QueueHandler
    {
        //This Queue class is a thread safe (written in house) class
        public static Queue&lt;Object&gt; readQ = new Queue&lt;Object&gt;(100);
        
        public static void enqueue(Object object)
        {
            //do some stuff
            readQ.add(object);
        }

        public static Object dequeue()
        {
            //do some stuff
            return readQ.get();
        }
    }
        
**OR**

Main class-

    public class SomeApp
    {
        Queue&lt;Object&gt; readQ;
        private Consumer consumer;
        private Producer producer;

        public static void main (String args[])
        {
            readQ = new Queue&lt;Object&gt;(100);
            consumer = new Consumer(readQ);
            producer = new Producer(readQ);
        }
    } 

Consumer class-

    public class Consumer implements Runnable
    {
        Queue&lt;Object&gt; queue;

        public Consumer(Queue&lt;Object&gt; readQ)
        {
            queue = readQ;
            Thread consumer = new Thread(this);
            consumer.start();
        }

        public void run()
        {
            while(true)
            {
                //get an object off the queue
                Object object = queue.dequeue();
                //do some stuff with the object
            }
        }
    }

Producer class-

    public class Producer implements Runnable
    {
        Queue&lt;Object&gt; queue;

        public Producer(Queue&lt;Object&gt; readQ)
        {
            queue = readQ;
            Thread producer = new Thread(this);
            producer.start();
        }

        public void run()
        {

            while(true)
            {
                //add to the queue some sort of unique object
                queue.enqueue(new Object());
            }
        }
    }

Queue class-

    //the extended Queue class is a thread safe (written in house) class
    public class QueueHandler extends Queue&lt;Object&gt;
    {    
        public QueueHandler(int size)
        {
            super(size); //All I&#39;m thinking about now is McDonalds.
        }

        public void enqueue(Object object)
        {
            //do some stuff
            readQ.add();
        }

        public Object dequeue()
        {
            //do some stuff
            return readQ.get();
        }
    }

And go!

Producer/Consumer threads using a Queue

My Java test worked well from Eclipse. But now, when I relaunch test from the run menu, I get the following message: 

    No tests found with test runner &#39;JUnit 4&#39;

In the `.classpath` file I have all `jar` files, and at the end have: 

    &lt;classpathentry exported=&quot;true&quot; kind=&quot;con&quot; path=&quot;org.eclipse.jdt.junit.JUNIT_CONTAINER/4&quot;/&gt;
    	&lt;classpathentry kind=&quot;output&quot; path=&quot;bin&quot;/&gt;
    &lt;/classpath&gt;

How can I resolve this error and get tests running again?


No tests found with test runner &#39;JUnit 4&#39;

This error is just bizarre, my code compiles fine, I can see there are no problems with it, yet this error has just popped up. I have tried re-starting NetBeans and there is no additional exception information.

What can cause this?

java.lang.RuntimeException: Uncompilable source code - what can cause this?

Eclipse is adding @Override annotations when I implement methods of an interface.  Eclipse seems to have no problem with this.  And our automated build process from Cruise Control seems to have no problem with this.  But when I build from the command-line, with ant running javac, I get this error:

    [javac] C:\path\project\src\com\us\MyClass.java:70: method does not override a method from its superclass
    [javac]     @Override
    [javac]      ^
    [javac] 1 error

Eclipse is running under Java 1.6.  Cruise Control is running Java 1.5.  My ant build fails regardless of which version of Java I use.

Content Type	Original Author	Original Content on Stackoverflow
Question	user256239	View Question on Stackoverflow
Solution 1 - Java	Michael Borgwardt	View Answer on Stackoverflow

Closing a ByteArrayOutputStream has no effect?

Java Problem Overview

Java Solutions

Solution 1 - Java

The model item passed into the dictionary is of type ‘mvc.Models.ModelA’ but this dictionary requires a model item of type ‘mvc.Models.ModelB‘

Sparse checkout in Git 1.7.0?

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