M1 means Milestone 1, it&#39;s a release name, like beta or alpha.
RC means Release Candidate.

A milestone means that the application got a huge improvement from the todo list.
A release candidate is a release that can be the final release unless some major bugs are found.

To quote the ASF:

&gt; Releases that only represent a project milestone and are intended only
&gt; for bleeding-edge developers working outside the project are called
&gt; &quot;alpha&quot;.

---

**Resources :**

 - [Wikipedia - Software release life cycle][1]
 - [ASF release types][2]


  [1]: http://en.wikipedia.org/wiki/Software_release_life_cycle
  [2]: https://www.apache.org/legal/release-policy.html#release-types

I have been using Java&#39;s ConcurrentMap for a map that can be used from multiple threads. The putIfAbsent is a great method and is much easier to read/write than using standard map operations. I have some code that looks like this:

    ConcurrentMap&lt;String, Set&lt;X&gt;&gt; map = new ConcurrentHashMap&lt;String, Set&lt;X&gt;&gt;();

    // ...

    map.putIfAbsent(name, new HashSet&lt;X&gt;());
    map.get(name).add(Y);

Readability wise this is great but it does require creating a new HashSet every time even if it is already in the map. I could write this:

    if (!map.containsKey(name)) {
        map.putIfAbsent(name, new HashSet&lt;X&gt;());
    }
    map.get(name).add(Y);

With this change it loses a bit of readability but does not need to create the HashSet every time. Which is better in this case? I tend to side with the first one since it is more readable. The second would perform better and may be more correct. Maybe there is a better way to do this than either of these.

What is the best practice for using a putIfAbsent in this manner?

Should you check if the map containsKey before using ConcurrentMap&#39;s putIfAbsent

I&#39;d like to use the **time** command in a **bash script** to calculate the elapsed time of the script and write that to a log file.  I only need the **real time**, not the user and sys.  Also need it in a decent format. e.g 00:00:00:00 (not like the standard output).  I appreciate any advice.

The expected format supposed to be `00:00:00.0000` (milliseconds) [hours]:[minutes]:[seconds].[milliseconds]

I&#39;ve already 3 scripts. I saw an example like this:

    { time { # section code goes here } } 2&gt; timing.log

But I only need the real time, not the user and sys. Also need it in a decent format. e.g `00:00:00:00` (not like the standard output).

In other words, I&#39;d like to know how to turn the time output into something easier to process.

Custom format for time command

I&#39;ve been using maven for a while, and I often review repositories before selected what version I want to use.  I don&#39;t entirely understand what the extensions mean.

I know that when I see extensions like -RC1 and -RC2 that means release candidates.   When I see a version without an extension, I assume that means a released version.  But what does an extension of -M1 or -M2 mean?

Example:

2.8-RC1

2.8

2.8-M1  ??

What does M1 mean in a maven repository?

I've been using maven for a while, and I often review repositories before selected what version I want to use. I don't entirely understand what the extensions mean.
I know that when I see extensions like -RC1 and -RC2 that means release candidates. When I see a version without an extension, I assume that means a released version. But what does an extension of -M1 or -M2 mean?
Example:
2.8-RC1
2.8
2.8-M1 ??

I&#39;m currently in the process of moving some project from Ant to Maven. Conformist as I am, I want to use well-established conventions for finding `groupId` and `artifactId`, but I can&#39;t find any detailed conventions (there are some, but they don&#39;t cover the points I&#39;m wondering about).

Take this project for instance, first the Java package: `com.mycompany.teatimer`

*Tea timer* is actually two words, but the Java package naming conventions forbid the insertion of underscores or hyphens, so I&#39;m writing it all together.

I chose the `groupId` identical to the package ID because I think that&#39;s a good idea. Is it?

Finally, I have to pick an `artifactId`, I currently went for `teatimer`. But when I look at other Maven projects, they use hyphens to split words in `artifactId`s, like this: `tea-timer`. But it does look weird when concatenated to the `groupId`: `com.mycompany.teatimer.tea-timer`.

How would you do this?

Another example:

Package name: `com.mycompany.awesomeinhouseframework`

`groupId`: `com.mycompany.awesomeinhouseframework` (?)

`artifactId`: `awesome-inhouse-framework` (?)

Maven artifact and groupId naming

I created a Plexus component to house common logic for several Mojos I want to create. I have been able to pass information like `localRepository` and project from the Mojo (and test cases).

I was wondering if there is a way to get the `MavenSession` or `MavenExecutionRequest` from within the component without having to pass them as parameters from a Mojo. I know my component will be running from a Maven Mojo.

I&#39;m using Maven 2 in this instance.

How to get the current MavenSession or MavenExecutionRequest from a Plexus Component

Using intellij and maven pom files, how do i debug tests run inside the maven test goal?

When i run them directly in the code, it complains something about profiles missing, which i&#39;ve ticked inside intellij&#39;s Maven Projects.

In IntelliJ, how do i debug a maven test goal?

Where is Maven&#39;s settings.xml located on Mac OS?

I have created a minimal maven project with a single child module in eclipse helios.

In the src/test/resources folder I have put a single file &quot;install.xml&quot;. In the folder src/test/java I have created a single package with a single class that does:

      @Test
      public void doit() throws Exception {
        URL url = this.getClass().getClassLoader().getResource(&quot;install.xml&quot;);
        System.out.println(url.getPath());
    
      }

but when I run the code as a junit 4 unit test I just get a NullPointerException. This has worked fine a million of times before. Any ideas?

I have followed this guide:

http://www.fuyun.org/2009/11/how-to-read-input-files-in-maven-junit/

but still get the same error.

this.getClass().getClassLoader().getResource(&quot;...&quot;) and NullPointerException

I&#39;m looking for pointers, suggestions, and even dictation on how to manage the three different assembly version numbers for a .NET assembly.   The Product version is the simplest, as this seems would normally be dictated by business.  Then, the file version seems to be for versioning between deployments, where the actual assembly version is only used when shipping.

Right now I&#39;m just looking for a simple means of labeling test and maintenance releases of an assembly on which none depend, so I am looking at auto-incrementing build and revision numbers on the file version, and for final release, copying the current file version to the assembly version.  The product is in production use, but still under development - you know - one of those small company, no change control infrastructure situations.

Best practices/guidance for maintaining assembly version numbers

Some co-workers and I got into a debate on the best way to store historical data.  Currently, for some systems, I use a separate table to store historical data, and I keep an original table for the current, active record.  So, let&#39;s say I have table FOO.  Under my system, all active records will go in FOO, and all historical records will go in FOO_Hist.  Many different fields in FOO can be updated by the user, so I want to keep an accurate account of everything updated.  FOO_Hist holds the exact same fields as FOO with the exception of an auto-incrementing HIST_ID.  Every time FOO is updated, I perform an insert statement into FOO_Hist similar to: `insert into FOO_HIST select * from FOO where id = @id`.  

My co-worker says that this is bad design because I shouldn&#39;t have an exact copy of a table for historical reasons and should just insert another record into the active table with a flag indicating that it&#39;s for historical purposes.

Is there a standard for dealing with historical data storage?  It seems to me that I don&#39;t want to clutter my active records with all of my historical records in the same table considering that it may be well over a million records (I&#39;m thinking long term).

How do you or your company handle this?

I&#39;m using MS SQL Server 2008, but I&#39;d like to keep the answer generic and arbitrary of any DBMS.

How to Store Historical Data

How do I install a specific version of a formula in homebrew?  For example, postgresql-8.4.4 instead of the latest 9.0.

Homebrew install specific version of formula?

Is there any way to compare such strings on bash, e.g.: `2.4.5` and `2.8` and `2.4.5.1`?

How to compare two strings in dot separated version format in Bash?

Today I discovered a bug for Git on Mac&amp;nbsp;OS&amp;nbsp;X. 

For example, I will commit a file with the name &#252;berschrift.txt with the German special character &#220; at the beginning. From the command `git status` I get following output.

    Users-iMac: user$ git status
    
    On branch master
    # Untracked files:
    #   (use &quot;git add &lt;file&gt;...&quot; to include in what will be committed)
    #
    #	&quot;U\314\210berschrift.txt&quot;
    nothing added to commit but untracked files present (use &quot;git add&quot; to track)

It seems that Git 1.7.2 has a problem with German special characters on Mac&amp;nbsp;OS&amp;nbsp;X.
Is there a solution to get Git read the file names correct?


Git and the Umlaut problem on Mac OS X

What is the simplest way to retrieve version number from maven&#39;s pom.xml in code, i.e., programatically?

Retrieve version from maven pom.xml in code

I&#39;ve got an sbt (Scala) project that currently pulls artifacts from the web. We&#39;d like to move towards a corporate-standardized Nexus repository that would cache artifacts. From the Nexus documentation, I understand how to do that for Maven projects. But sbt obviously uses a different approach. (I understand Ivy is involved somehow, but I&#39;ve never used it and don&#39;t understand how it works.)

How do I tell sbt and/or the underlying Ivy to use the corporate Nexus repository system for all dependencies? I&#39;d like the answer to use some sort of project-level configuration file, so that new clones of our source repository will automatically use the proxy. (I.e., mucking about with per-user config files in a dot-directory is not viable.) 

Thanks!

how do I get sbt to use a local maven proxy repository (Nexus)?

I thought I was an experienced Maven user, but I am having a mental block on how to do this!

I&#39;ve been able to use the Maven sql plugin to drop, create, and install a schema in a database via plugin executions I&#39;ve defined and bound to the `pre-integration-test` phase.

However, now I&#39;d like to use that same sql plugin to insert some sample data whenever I want from the command line -- that is, not bound to any lifecycle goal.  There are a few different sets of sample data, so I&#39;d like to define a few different executions.

But is there a way to run one of these executions from the command line by using the execution ID perhaps?

Run a single Maven plugin execution?

Just wanted to know if it is possible in Eclipse to sort Maven dependencies by alphabetical order?

It&#39;s bothering me to have a list of 200 jars not ordered... :(

Content Type	Original Author	Original Content on Stackoverflow
Question	Fred Haslam	View Question on Stackoverflow
Solution 1 - Maven 2	Colin Hebert	View Answer on Stackoverflow

What does M1 mean in a maven repository?

Maven 2 Problem Overview

Maven 2 Solutions

Solution 1 - Maven 2

Custom format for time command

Should you check if the map containsKey before using ConcurrentMap's putIfAbsent

Attributions