Use the &#39;-N&#39; option in the mvn command.

From `mvn -h`:

&gt;  -N,--non-recursive                     Do not recurse into sub-projects

While Guillaume is indeed right and that is the correct option, I would personally recommend keeping your parent as a separate module.

I find the best approach for inheritance to be as follows:

    aggregator
    |- module1/ (extends parent)
    | |- pom.xml
    |- module2/ (extends parent)
    | |- pom.xml
    |- parent/
    | |- pom.xml
    |- pom.xml

This way you can always install the parent only, with `mvn clean install` without extra options.

You can also have the parent outside the aggregator so you can re-use it between more projects.

There are numerous benefits to keeping the parent and the aggregator as two separate things. But in the end, you choose what&#39;s best for your project/environment.


I have a path (including directory and file name).  
I need to test if the file-name is a valid, e.g. if the file-system will allow me to create a file with such a name.  
The file-name *has some unicode characters* in it.

It&#39;s safe to assume the directory segment of the path is valid and accessible (&lt;sup&gt;I was trying to make the question more gnerally applicable, and apparently I wen too far&lt;/sup&gt;).

I very much do not want to have to escape anything unless I *have* to. 

I&#39;d post some of the example characters I am dealing with, but apparently they get automatically removed by the stack-exchange system. Anyways, I want to keep standard unicode entities like `&#246;`, and only escape things which are invalid in a filename.

---

Here is the catch. **There may (or may not) already be a file at the target of the path.** I need to keep that file if it does exist, and not create a file if it does not.

Basically I want to check if I *could* write to a path **without actually opening the path for writing** (and the automatic file creation/file clobbering that typically entails).

As such:

    try:
        open(filename, &#39;w&#39;)
    except OSError:
        # handle error here
[from here](https://stackoverflow.com/questions/4102896/check-whether-a-path-is-valid-in-python)

Is not acceptable, because it will overwrite the existent file, which I do not want to touch (if it&#39;s there), or create said file if it&#39;s not.

I know I can do:

    if not os.access(filePath, os.W_OK):
        try:
            open(filePath, &#39;w&#39;).close()
            os.unlink(filePath)
        except OSError:
            # handle error here

But that will *create* the file at the `filePath`, which I would then have to `os.unlink`.

In the end, it seems like it&#39;s spending 6 or 7 lines to do something that should be as simple as `os.isvalidpath(filePath)` or similar.

---

As an aside, I need this to run on (at least) Windows and MacOS, so I&#39;d like to avoid platform-specific stuff.


``

Check whether a path is valid in Python without creating a file at the path&#39;s target

I made a simple `AlertDialog` in my **Activity**:

    View view = layoutInflater.inflate(R.layout.my_dialog, null);
    AlertDialog infoDialog = new AlertDialog.Builder(MyActivity.this)
    					.setView(view)	
    					.create();
    
    infoDialog.show();

With above code, the **dialog** shows at the (about) the center of the screen. 

I am wondering, how can I customize the dialog position to make it showing just under the top Action Bar ? (Is there anyway to change the gravity or something of the dialog?) and how to do it based on my code??

Changing position of the Dialog on screen android

I have a parent POM in a Maven project, with this structure:

                 parent
                   |
            ---------------
            |             |
          child1       child2


I want to install the POM of the *&quot;parent&quot;* in the local REPO to allow *child1* take some changes that I did in the dependencyManagement, but **I cannot do a regular &quot;clean install&quot;** because *&quot;child2&quot;* is broken and will not build.

Which is the proper way to do this with maven (other than going to the parent pom and commenting the *&quot;child2&quot;* module).



Install parent POM without building Child modules

I have a parent POM in a Maven project, with this structure:
<pre><code class="hljs language-lua"> parent
 |
 ---------------
 | |
 child1 child2
</code></pre>
I want to install the POM of the "parent" in the local REPO to allow child1 take some changes that I did in the dependencyManagement, but I cannot do a regular "clean install" because "child2" is broken and will not build.
Which is the proper way to do this with maven (other than going to the parent pom and commenting the "child2" module).

How do you read the same inputstream twice? Is it possible to copy it somehow?

I need to get a image from web, save it locally and then return the saved image. I just thought it would be faster to use the same stream instead of starting a new stream to the downloaded content and then read it again.

Read input stream twice

Swing components have multiple methods related to updates of screen layout, in particular:

 - [`validate()`][1]
 - [`invalidate()`][2]
 - [`revalidate()`][3]

The Java documentation defines these somewhat from a technical perspective, but it&#39;s not particularly clear how they are meant to be used.

What is the difference between these, and in what circumstances should you use one rather than the others?


  [1]: http://docs.oracle.com/javase/8/docs/api/java/awt/Container.html#validate--
  [2]: http://docs.oracle.com/javase/8/docs/api/java/awt/Container.html#invalidate--
  [3]: http://docs.oracle.com/javase/8/docs/api/javax/swing/JComponent.html#revalidate--

Difference between validate(), revalidate() and invalidate() in Swing GUI

I would like to know What are the difference between folder-structure and package used in Eclipse IDE for Java EE development. 

When do we use which one and why?.

Whats should be the practice 

 - create a folder structure like src/com/utils and then create a class inside it 
 - create a package like src.com.util and then create a class inside it

which option would be better and easy to deploy if i have to write a ant script later for deployment ?

if i go for the folder-structure will the deployment is as easy as copying files from development to deployment target ?


Java Package Vs Folder-Structure? what is the difference

I was looking at Amazon S3 Samples, and the samples are there for inserts/deletes...

But I want to update an existing blob with fresh data. Basically the content is a text file, and the text has been modified, I want the S3 object to store the new text content.

How do I do this in Java? 



Can I update an existing Amazon S3 object?

I have a service defined as follows.

`public String getData(@QueryParam(&quot;date&quot;) Date date)`

I&#39;m trying to pass a `java.util.Date` to it from my client (which is jaxrs:client of CXF, not a generic HTTP client or browser).

My service receives the date as `Thu Mar 01 22:33:10 IST 2012` in the HTTP URL. Since CXF won&#39;t be able to create a `Date` object using this String, my client receives a 404 error.
I tried using a `ParameterHandler` on the service side, but I still can&#39;t parse it successfully because I&#39;m not expecting the date in any specific format.

As per [this post][1], passing a `Date` is supposed to work out of the box, but I can&#39;t seem to get the basic case working. Am I required to do anything in order to successfully pass a Date object from my client to service? Appreciate any help.

Thanks


  [1]: https://stackoverflow.com/questions/583973/jax-rs-jersey-how-to-customize-error-handling &quot;this post&quot;

CXF JAXRS - How do I pass Date as QueryParam

What is the best way to change version of Maven project, to release this version and then return back to `*-SNAPSHOT` development.

Currently I&#39;m doing following:

 - retrieve current version (most likely with `SNAPSHOT`) from `pom.xml`
 - increment version (`mvn -DnewVersion=&lt;something&gt; versions:set`), respecting rules described in the question [Maven artifact version for patches][1]
 - `mvn:install` to sent to repo
 - renaming version once again adding `SNAPSHOT` postfix.
 - committing changes (using some version control system)    

I have a strong feeling I&#39;m doing something wrong and/or inefficient.

  [1]: https://stackoverflow.com/questions/5352326/maven-artifact-version-for-patches

Maven versioning best practices

I have a maven project that I want to build without version.

Now, when I build the project using maven, it creates this `commonjerseylib-1.0.war` but I need this `commonjerseylib.war` to be created.

In addition to that, I remove `&lt;version&gt;` tag from `pom.xml` but still Maven is creating with `war` with version 1.0 by default.

My `pom.xml` :

   

          &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
          &lt;groupId&gt;commonjerseylib&lt;/groupId&gt;
          &lt;artifactId&gt;commonjerseylib&lt;/artifactId&gt;
          &lt;packaging&gt;ear&lt;/packaging&gt;
          &lt;name&gt;commonjerseylib&lt;/name&gt;
          &lt;!--&lt;version&gt;1.0&lt;/version&gt;--&gt;

How to build it without version ?

How to build maven project without version?

On Windows 7, I am trying to send the output of a **maven-3** command to a text file.

I call the command from the root of the project I am trying to analyze.

The command is:

    mvn dependency:tree -Dverbose -Dincludes=commons-collections -DoutputFile=C:\Users\myname\Documents\output.txt

When I run the command without the `outputFile` parameter, I see the output sent to the console.

But when I use it with the `outputFile` parameter, the output file is empty.

Any idea what I am missing here?

Send maven output to file

In addition to the src/main/java, I am adding a src/bootstrap directory that I want to include in my build process, in other words, I want maven to compile and include the sources there in my build. How!?

How to add an extra source directory for maven to compile and include in the build jar?

I&#39;ve created a simple console Java application that is built with Maven. Is there a way that the main class (which doesn&#39;t require any arguments) can be run from the command-line using a maven command like:

    mvn run-app com.example.MainClass

run main class of Maven project

Hello I&#39;m using a configuration file from src/main/resources in my java application. I&#39;m reading it in my Class like this :

    new BufferedReader(new FileReader(new File(&quot;src/main/resources/config.txt&quot;)));

So now I&#39;m building this with maven using `mvn assembly:assembly`. Here is the bit for that in my pom.xml :

    &lt;plugin&gt;
    				&lt;artifactId&gt;maven-assembly-plugin&lt;/artifactId&gt;
    				&lt;version&gt;2.3&lt;/version&gt;
    				&lt;configuration&gt;
    					&lt;finalName&gt;TestSuite&lt;/finalName&gt;
    					&lt;descriptorRefs&gt;
    						&lt;descriptorRef&gt;jar-with-dependencies&lt;/descriptorRef&gt;
    					&lt;/descriptorRefs&gt;
    					&lt;archive&gt;
    						&lt;manifest&gt;
    							&lt;addClasspath&gt;true&lt;/addClasspath&gt;
    							&lt;mainClass&gt;com.some.package.Test&lt;/mainClass&gt;
    						&lt;/manifest&gt;
    					&lt;/archive&gt;
    				&lt;/configuration&gt;
    			&lt;/plugin&gt;

So when I run my app I get this error :

    src\main\resources\config.txt (The system cannot find the path specified)

But when I right click on my assembled jar I can see it inside, anyone knows what I&#39;m doing wrong?

Resource from src/main/resources not found after building with maven

I am trying to import cloudera&#39;s **org.apache.hadoop:hadoop-client:2.0.0-cdh4.0.0** [from cdh4 maven repo](https://ccp.cloudera.com/display/CDH4DOC/Using+the+CDH4+Maven+Repository) in a maven project in eclipse 3.81, m2e plugin, with oracle&#39;s jdk 1.7.0_05 on win7 using 

    &lt;dependency&gt;
		&lt;groupId&gt;org.apache.hadoop&lt;/groupId&gt;
		&lt;artifactId&gt;hadoop-client&lt;/artifactId&gt;
		&lt;version&gt;2.0.0-cdh4.0.0&lt;/version&gt;
    &lt;/dependency&gt;

however, I get the following error:

    The container &#39;Maven Dependencies&#39; references non existing library &#39;C:\Users\MyUserId\.m2\repository\jdk\tools\jdk.tools\1.6\jdk.tools-1.6.jar&#39;

more  specific, maven states that the following artifact is missing

    Missing artifact jdk.tools:jdk.tools:jar:1.6

How to solve this?

Buiding Hadoop with Eclipse / Maven - Missing artifact jdk.tools:jdk.tools:jar:1.6

i am using **spring 3.1.0.RELEASE**, and my servlet container is **tomcat 7** and my IDE is **eclipse indigo**
and the jar **spring-webmvc-3.1.0.RELEASE.jar** which contains the **DispatcherServlet**
exists in the lib folder, and yet when running the application, i am getting the exception:

    java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
    	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
    	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
    	at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:525)
    	at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:507)
    	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:126)
    	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1099)
    	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1043)
    	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4957)
    	at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5284)
    	at org.apache.catalina.core.StandardContext$3.call(StandardContext.java:5279)
    	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    	at java.lang.Thread.run(Thread.java:662)

please advise why i am getting this exception, and how to fix it.

EDIT: following are my configuration files:

**1- .springBeans:**

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
    &lt;beansProjectDescription&gt;
    	&lt;version&gt;1&lt;/version&gt;
    	&lt;pluginVersion&gt;&lt;![CDATA[2.9.0.201203011806-RELEASE]]&gt;&lt;/pluginVersion&gt;
    	&lt;configSuffixes&gt;
    		&lt;configSuffix&gt;&lt;![CDATA[xml]]&gt;&lt;/configSuffix&gt;
    	&lt;/configSuffixes&gt;
    	&lt;enableImports&gt;&lt;![CDATA[false]]&gt;&lt;/enableImports&gt;
    	&lt;configs&gt;
    		&lt;config&gt;src/main/webapp/WEB-INF/checkout-servlet.xml&lt;/config&gt;
    	&lt;/configs&gt;
    	&lt;configSets&gt;
    	&lt;/configSets&gt;
    &lt;/beansProjectDescription&gt;

**2- web.xml:**

&lt;!DOCTYPE web-app PUBLIC
 &quot;-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN&quot;
 &quot;http://java.sun.com/dtd/web-app_2_3.dtd&quot; &gt;

    &lt;web-app&gt;
      &lt;display-name&gt;Checkout&lt;/display-name&gt;
      
      &lt;servlet&gt;
        &lt;servlet-name&gt;checkout&lt;/servlet-name&gt;
        &lt;servlet-class&gt;org.springframework.web.servlet.DispatcherServlet&lt;/servlet-class&gt;
        &lt;load-on-startup&gt;1&lt;/load-on-startup&gt;
      &lt;/servlet&gt;
    
      &lt;servlet-mapping&gt;
        &lt;servlet-name&gt;checkout&lt;/servlet-name&gt;
        &lt;url-pattern&gt;*.action&lt;/url-pattern&gt;
      &lt;/servlet-mapping&gt;
      
    &lt;/web-app&gt;

**3- checkout-servlet.xml:**

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
    &lt;beans xmlns=&quot;http://www.springframework.org/schema/beans&quot;
    	xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
    	xmlns:context=&quot;http://www.springframework.org/schema/context&quot;
    	xsi:schemaLocation=&quot;http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd&quot;&gt;
        
        &lt;context:component-scan base-package=&quot;com.myapp&quot;/&gt;
        
        &lt;bean id=&quot;myService&quot; class=&quot;com.myapp.MyService&quot;/&gt;
    
    &lt;/beans&gt;

also when trying to access any page in the application, i get the exception:

    HTTP Status 404 - Servlet checkout is not available
    
    type Status report
    
    message Servlet checkout is not available
    
    description The requested resource (Servlet checkout is not available) is not available.
    Apache Tomcat/7.0.22

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

I am using maven as build tool.  I have set an environment variable called `env`.  How can I get access to this environment variable&#39;s value in the `pom.xml` file?

How to refer environment variable in POM.xml?

This is a snippet of my pom file.

&lt;!-- language: lang-xml --&gt;

    ....
    		&lt;plugins&gt;
    			&lt;plugin&gt;
    				&lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
    				&lt;artifactId&gt;maven-dependency-plugin&lt;/artifactId&gt;
    				&lt;version&gt;2.4&lt;/version&gt;                        
    				&lt;executions&gt;
    					&lt;execution&gt;
    						&lt;phase&gt;install&lt;/phase&gt;
    						&lt;goals&gt;
    							&lt;goal&gt;copy-dependencies&lt;/goal&gt;
    						&lt;/goals&gt;
    						&lt;configuration&gt;
    							......
    						&lt;/configuration&gt;
    					&lt;/execution&gt;
    				&lt;/executions&gt;
    			&lt;/plugin&gt;
    		&lt;/plugins&gt;
    ...

I use it successfully with the command 

    mvn install

But, when I try to enclose it into the &quot;pluginManagement&quot; tag, the `maven-dependency-plugin` stops working when I launch the `install` goal.
Why does the &quot;pluginManagement&quot; tag change the build behavior? Or should I use another goal or option?

What is pluginManagement in Maven&#39;s pom.xml?

I just started using Maven and I was told to do `mvn install` in a specific directory.  

What does `mvn install` do, exactly?

I think it looks for `pom.xml` in the current folder and starts following the instructions specified in that file. Is that correct?

What does mvn install in maven exactly do

I just started using Maven and I read that plugins are additional components that can be used.   
A typical structure of `pom.xml` file is

&lt;!-- language: xml-lang --&gt;

    &lt;project&gt;
      &lt;groupId&gt;org.koshik.javabrains&lt;/groupId&gt;
      &lt;artifactId&gt;JarName&lt;/artifactId&gt; (A fldernamed JarName was created) 
      &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt;
      &lt;packaging&gt;jar&lt;/packaging&gt;
    
      &lt;name&gt;JarName&lt;/name&gt;
      &lt;url&gt;http://maven.apache.org&lt;/url&gt;
    
      &lt;properties&gt;
        &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
      &lt;/properties&gt;
    
      &lt;dependencies&gt;
        &lt;dependency&gt;
          &lt;groupId&gt;junit&lt;/groupId&gt;
          &lt;artifactId&gt;junit&lt;/artifactId&gt;
          &lt;version&gt;3.8.1&lt;/version&gt;
          &lt;scope&gt;test&lt;/scope&gt;
        &lt;/dependency&gt;
      &lt;/dependencies&gt;
    &lt;/project&gt;

**Question**: Where should I insert a `plugin` tag? such as the following:

    &lt;plugin&gt;
      &lt;groupId&gt;org.jibx&lt;/groupId&gt;
      &lt;artifactId&gt;jibx-maven-plugin&lt;/artifactId&gt;
      &lt;version&gt;1.2.4&lt;/version&gt;
      &lt;executions&gt;
        &lt;execution&gt;
          &lt;goals&gt;
            &lt;goal&gt;bind&lt;/goal&gt;
          &lt;/goals&gt;
        &lt;/execution&gt;
      &lt;/executions&gt;
    &lt;/plugin&gt;

Before the dependency or after the `dependency` tag? Does it matter?

Plugins in Maven and POM.xml

Starting from Maven 2.0.9 there is possibility to include 

    &lt;type&gt;pom&lt;/type&gt;
    &lt;scope&gt;import&lt;/scope&gt;

in the `&lt;dependencyManagement&gt;` section.

 As I understand it, it will be &quot;replaced&quot; with dependencies included in this pom as if they were originally defined here.

What is the difference between solution above and simple dependency to this pom without `import` scope (I saw the latter being called &quot;dependencies grouping&quot;)? Is the only difference that such &quot;grouped&quot; dependencies have lower priority while resolving dependencies precedence?

Content Type	Original Author	Original Content on Stackoverflow
Question	Mr.Eddart	View Question on Stackoverflow
Solution 1 - Java	Guillaume Polet	View Answer on Stackoverflow
Solution 2 - Java	carlspring	View Answer on Stackoverflow

Install parent POM without building Child modules

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Changing position of the Dialog on screen android

Check whether a path is valid in Python without creating a file at the path's target

Attributions