`MAVEN_HOME` is for Maven 1, `M2_HOME` is for Maven 2 and later.

Maven 2 was a complete rewrite from Maven 1 and was not backwards compatible.  Having the two different `_HOME` variables means it is possible to run both on the same machine.

**UPDATE**

As of maven 3.5.0 neither of these environment variables should be specified. Instead, the path should be updated to include the mvn executable.

And, ironically, you must still use M2_HOME and M2 for Maven version 3. Otherwise, it fails, because they didn&#39;t follow this logical approach with Maven V3.x for some bizarre reason.  

Consequently, it is not easy to support Maven 2 &amp; Maven 3 on the same machine without rewriting your configuration.

I&#39;m a newbie to Linux. Is there a way to see the control characters in gedit. I went to options-&gt;preferences and all I got is option to see the line numbers of the text file. Is there any plugin that needs to be installed to see the same? I&#39;m on Ubuntu 12.04 LTS and the gedit version is 3.4.1.

Option to display control characters in gedit

I want to apply some specific styles to all elements which come after a certain element. For example, I want to select all elements which come after the `divider` and change their background color to green.


    &lt;ul&gt;
      &lt;li&gt; Cricket &lt;/li&gt;
      &lt;li&gt; Hockey &lt;/li&gt;
      &lt;li class=&#39;divider&#39;&gt; &lt;/li&gt; //Divider here
      &lt;li&gt; Football &lt;/li&gt;
      &lt;li&gt; Table Tennis &lt;/li&gt;
    &lt;/ul&gt;

CSS code

    li {
      background-color: red;
    }

    //Selector to select elements after divider {
      background-color: green;
    }


Select all elements after specific element

I have two version of environment variables for maven home - `M2_HOME` and `MAVEN_HOME`.&lt;br&gt;

Which one needs to be set?

What is the difference between M2_HOME and MAVEN_HOME

I have two version of environment variables for maven home - <code>M2_HOME</code> and <code>MAVEN_HOME</code>. 
Which one needs to be set?

Assume standard maven setup.

Say in your resources folder you have a file `abc`. 

In Java, how can I get absolute path to the file please?

How to get absolute path to file in /resources folder of your project

Is there a way to have a Maven dependency graph of a given set of projects (if possible, graphical), without having 3rd party dependencies drawn too? Or where I opt out the dependencies I&#39;m not interested in?

I&#39;d like to point the tool/plugin at a number of POM files and see a description of the dependencies between those projects.

Maven dependency graph

I have already checked this post:
https://stackoverflow.com/questions/12718753/how-to-download-dependency-sources-for-gradle-project-in-idea

But it didn&#39;t work for me. Maybe it is because they are referring to IntelliJ Idea, and I am having the issue with Android Studio.

I have tried adding 

    apply plugin: &#39;idea&#39;
    idea {
        module {
            downloadJavadoc = true
            downloadSources = true
        }
    }
Both to root&#39;s build.gradle file (I am in a multiproject setup) or to the application&#39;s build.gradle file.

My application&#39;s gradle file:

    buildscript {
        repositories {
            mavenCentral()
        }
        dependencies {
            classpath &#39;com.android.tools.build:gradle:0.4.2&#39;
        }
    }

    repositories {
        mavenCentral()
    }
    dependencies {
        compile files(&#39;libs/android-support-v4.jar&#39;)
        compile &#39;com.nostra13.universalimageloader:universal-image-loader:1.8.4&#39;
    }
    android {
        compileSdkVersion 17
        buildToolsVersion &quot;17.0.0&quot;

        defaultConfig {
            minSdkVersion 7
            targetSdkVersion 16
        }
    }

Then, in Android Studio when I click on any method from the universalimageloader library, I get to a screen saying that there are no sources attached. If I click attach sources it shows:
![enter image description here][1]

As you can see, only the lib&#39;s jar was downloaded to gradle cache. No *-sources.jar or *-javadoc.jar were downloaded. I have cleaned project, removed .gradle folder to force it to download again from maven. No luck.

I double checked that universal image loaded has sources and javadoc available in maven, so that is not the problem.

Thanks!


  [1]: http://i.stack.imgur.com/oV1Qg.png

How to make Android Studio download dependencies sources and javadoc?

I&#39;m working on a Java project in Eclipse, which is built using Maven. I&#39;m using some recycled code from an older project, and one of these classes looks for a file in the `META-INF/services` folder of the JAR with a particular name, then parses the text of this file. In this particular example, it looks for a file with the name of a Java interface, then grabs the class name of the implementation from inside the file.

So basically what I&#39;m trying to do is **include a file in the &quot;META-INF/services&quot; folder of the JAR with a file name (X), and one line of text (Y)**. I&#39;m guessing this should be done using Maven, maybe by specifying an attribute in the POM file, but my research hasn&#39;t turned up anything. I know you&#39;re not supposed to hard-code or manually type out any META files, so I&#39;m not sure what to do here.

How to include a config file in the &quot;META-INF/services&quot; folder of a JAR using Maven

I am developing a Spring MVC application using STS (eclipse plugin) and maven.

For creating the project, I followed the STS wizard for a new &quot;Spring MVC project&quot;. Afterwards, I added some dependencies to other projects and libraries.

However, when I am now trying to deploy the project to the integrated vFabric server of STS, I sometimes get an exception:


    SEVERE: ContainerBase.addChild: start: 
    org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/wsa]]
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    	...
    Caused by: java.lang.IllegalStateException: Unable to complete the scan for annotations for web application [/app] due to a StackOverflowError. Possible root causes include a too low setting for -Xss and illegal cyclic inheritance dependencies. The class hierarchy being processed was [org.bouncycastle.asn1.ASN1EncodableVector-&gt;org.bouncycastle.asn1.DEREncodableVector-&gt;org.bouncycastle.asn1.ASN1EncodableVector]
    	at org.apache.catalina.startup.ContextConfig.checkHandlesTypes(ContextConfig.java:2179)
    	...

When issuing a &quot;maven clean&quot;, followed by a &quot;maven install&quot; and a restart of the server, the exception sometimes doesn&#39;t get thrown and the application works fine. Yet, most of the times, it doesn&#39;t work.

I guess there is no need to scan the bouncycastle dependencies for annotations.  
Can I somehow disable this scanning for some jars?

I already tried adding `metadata-complete=&quot;true&quot;` to my web.xml and increasing the stack size with no result.

What can I do to fix this?

Unable to complete the scan for annotations for web application [/app] due to a StackOverflowError

I am running **vagrant** 1.4 and **virtual box** 4.3 on fedora 17 machine. When I do &quot;vagrant up&quot;, I get this error:

    Bringing machine &#39;default&#39; up with &#39;virtualbox&#39; provider...                                                                            

                                     
    [default] Clearing any previously set forwarded ports...                                                                                                                
    [default] Clearing any previously set network interfaces...                                                                                                             
    There was an error while executing `VBoxManage`, a CLI used by Vagrant                                                                                                  
    for controlling VirtualBox. The command and stderr is shown below.                                                                                                      
                                                                                                                                                                            
    Command: [&quot;hostonlyif&quot;, &quot;create&quot;]                                                                                                                                       
    
    Stderr: 0%...
    Progress state: NS_ERROR_FAILURE
    VBoxManage: error: Failed to create the host-only adapter
    VBoxManage: error: VBoxNetAdpCtl: Error while adding new interface: VBoxNetAdpCtl: ioctl failed for /dev/vboxnetctl: Inappropriate ioctl for devic
    VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component HostNetworkInterface, interface IHostNetworkInterface
    VBoxManage: error: Context: &quot;int handleCreate(HandlerArg*, int, int*)&quot; at line 66 of file VBoxManageHostonly.cpp

VBoxManage: error: Failed to create the host-only adapter

How do I change the font size used in Solution Explorer? The default font size is too small for me.

How do I change the font size of Solution Explorer (in Visual Studio)

I have been reading up and learning about &lt;a href=&quot;https://docs.docker.com/&quot;&gt;Docker&lt;/a&gt;, and am trying to correctly choose the Django setup to use. So far there is either:

&lt;a href=&quot;https://docs.docker.com/compose/&quot;&gt;Docker Compose&lt;/a&gt; or [Dockerfile][1]

I understand that _Dockerfiles_ are used in _Docker Compose_, but I am not sure if it is good practice to put everything in one large Dockerfile with multiple `FROM` commands for the different images?

I want to use several different images that include:

    uwsgi
    nginx
    postgres
    redis
    rabbitmq
    celery with cron

Please advise on what are best practices in setting up this type of environment using *Docker*.

If it helps, I am on a Mac, so using &lt;a href=&quot;https://github.com/boot2docker&quot;&gt;boot2docker&lt;/a&gt;.

Some issues I&#39;ve had:

1. Docker Compose is not compatible with Python3
2. I want to containerize my project, so if one large Dockerfile 
is not ideal, then I feel I&#39;d need to break it up using Docker Compose
3. I am OK to make the project Py2 &amp; Py3 compatible, so am leaning towards django-compose


  [1]: https://docs.docker.com/engine/reference/builder/

What&#39;s the difference between Docker Compose vs. Dockerfile

# Intro

I can&#39;t figure out a good way to set up a development environment on OS X using Docker and Boot2Docker. The problem I&#39;m hitting is how to manage the source code so that:

1. I can modify the code on OS X using the tools (text editor, IDE, git, etc) I already have installed.
2. Those modifications are reflected in the Docker container so if I re-run tests or refresh a webpage, I can see my changes immediately.

In theory, this should be easy to do by mounting my source code as a volume:

    docker run -it -v /path/to/my/source/code:/src some-docker-image

Unfortunately, this has two major issues that make it completely unusable on OS X:

# Issue #1: Mounted volumes on VirtualBox (which use vboxsf) are extremely slow

For example, here is how long it takes Jekyll to compile my [homepage](https://github.com/brikis98/yevgeniy-brikman-homepage) if the source code is part of the Docker image:

    &gt; docker run -it brikis98/yevgeniy-brikman-homepage:v1 bash

    root@7aaea30d98a1:/src# time bundle exec jekyll build

    [...]

    real	0m7.879s
    user	0m7.360s
    sys	    0m0.600s

Here is the exact same Docker image, except this time, I mount the source code from OS X:

    &gt; docker run -it -v $(pwd):/src brikis98/yevgeniy-brikman-homepage:v1 bash

    root@1521b0b4ce6a:/src# time bundle exec jekyll build

    [...]

    real	1m14.701s
    user	0m9.450s
    sys	    0m3.410s

# Issue #2: File watching is broken

The default watch mechanisms in SBT, Jekyll, and grunt use technologies such as inotify, which do not work if they are running in a Docker container and the changes are made in OS X to a mounted folder.

# Workarounds I tried

I searched for solutions (including all the ones on SO) and tried out a few of them, but have not found a successful one:

1. I [switched Boot2Docker to use NFS](https://gist.github.com/neilbartley/73f2eb334f04bf95a906), but it was just as slow.
1. I tried [Vagrant + NFS](https://stackoverflow.com/questions/28421391/whats-the-fastest-way-to-migrate-from-boot2docker-to-vagrantnfs-on-mac-os-x), and that was also just as slow.
1. I tried a [Samba mount](http://www.slideshare.net/Docker/dockercon-beahappierdevwithdocker140613160957phpapp02-37589065), but the folder always showed up empty in the Docker container.
1. I tried to use the [Unison file system](https://github.com/leighmcculloch/docker-unison), which worked briefly to sync files, but then kept [showing connection errors](https://github.com/leighmcculloch/docker-unison/issues/2).
1. I enabled [polling in Jekyll](http://salizzar.net/2014/11/06/creating-a-github-jekyll-blog-using-docker/), but that significantly increased the delay until my changes were picked up.
1. I tried [Dinghy](https://github.com/codekitchen/dinghy), a &quot;faster, friendlier Docker on OS X with Vagrant&quot; and got *some* improvement. Instead of Jekyll compilation being 10-15x slower, it was 2-3x slower. That&#39;s better, but still not quite usable.

Has anyone found a solution that actually works and allows you to productively develop code with Docker and OS X?

# Update: a solution at last!

I have finally found a solution that seems productive using Boot2Docker + rsync. I&#39;ve captured the details on how to set this up in [my own answer](https://stackoverflow.com/questions/30090007/whats-the-right-way-to-setup-a-development-environment-on-os-x-with-docker#30111077) as well as an open-source project called [docker-osx-dev](https://github.com/brikis98/docker-osx-dev).

What&#39;s the right way to set up a development environment on OS X with Docker?

For some reason, I have to run my app in production mode. What is the difference between those modes?

Content Type	Original Author	Original Content on Stackoverflow
Question	developer	View Question on Stackoverflow
Solution 1 - Maven	prunge	View Answer on Stackoverflow
Solution 2 - Maven	Martin Spamer	View Answer on Stackoverflow

What is the difference between M2_HOME and MAVEN_HOME

Maven Problem Overview

Maven Solutions

Solution 1 - Maven

Solution 2 - Maven

Select all elements after specific element

Option to display control characters in gedit

Attributions