Yes, it is. Ideally, package names should be globally unique, to avoid naming collisions. Using the default package breaks this convention. It&#39;s also impossible to import a class from the default package.

Why do unnamed packages exist at all, if it&#39;s such a bad idea? From [the JLS &amp;sect;7.4.2][1]:

&gt; Unnamed packages are provided by the Java platform principally for convenience when developing small or temporary applications or when just beginning development.



  [1]: http://java.sun.com/docs/books/jls/third_edition/html/packages.html#7.4.2

There are problems on many different levels:

- you can&#39;t import classes in the default package from classes that are not
- you will get class loading problems if you try to resolve the default package in multiple artifacts
- you can no longer use the default and protected scope like you normally can
- there&#39;s no obvious distinction between your code and other code

Yes, it is. The problem is that it is not possible to import classes from the default package.

Is this link valid?

    &lt;a href=&quot;?lang=en&quot;&gt;eng&lt;/a&gt;

I know the browsers treat it as expected and I know the [empty link would be ok][1] too - but is it ok to specify just the parameters?

I am curious because question mark (&quot;?&quot;) is only a convention by most HTTP servers (AFAIK), though I admit it is a prevailing one.

So, to recap:

 1. will all browsers interpret this correctly?

 2. is this in RFC?

 3. can I expect some trouble using this?

**UPDATE:** the intended action on click is to redirect to the same page, but with different GET parameters (&quot;lang=en&quot; in above example).

  [1]: https://stackoverflow.com/questions/5637969/is-an-empty-href-valid

is link / href with just parameters (starting with question mark) valid?

Assume that I need to manage an artifact that consists of an aribtrary folder / file structure rolled up as a zip archive.  It&#39;s not clear to me how to accomplish this in Maven in a way that best fits &quot;the Maven way.&quot;  

I know that there is no &quot;zip&quot; packaging type.  Does this mean there is no generic lifecycle in Maven to simply take what I have in the resources folder, zip it up, and install/deploy it to my repositories?  

I&#39;m looking for options, with evaluations of how each option satisifies my requirement to follow the maven way, as I do not wish to incur the obvious penalities of straying from the golden path . . . 

Maven best practice for creating ad hoc zip artifact

Is the use of Java&#39;s default package a bad practice?

<p>Is the use of Java's default package a bad practice?</p>


In the HTML of a web application there is the following code:

```lang-html
&lt;input type=&quot;text&quot; name=&quot;prettyTime&quot; id=&quot;prettyTime&quot; class=&quot;ui-state-disabled prettyTime&quot;  readonly=&quot;readonly&quot;&gt;
```

A string displaying the time is actually shown on the page.

In Selenium WebDriver, I have a `WebElement` object referring to the `&lt;input&gt;` using:

    WebElement timeStamp = waitForElement(By.id(&quot;prettyTime&quot;));

I want to get the value of the `WebElement`, or, in other words, what is printed on the page. I tried all the `WebElement` getters and nothing has been retrieving the actual value that the user sees.




Using Selenium WebDriver to retrieve the value of an HTML input

How do I parse a `String` value to a `char` type, in Java?  

I know how to do it to int and double (for example `Integer.parseInt(&quot;123&quot;)`).
Is there a class for Strings and Chars?



How to convert/parse from String to char in java?

my goal is to configure the `objectMapper` in the way that it only serialises element which are annotated with `@JsonProperty`.

In order to do so I followed this [explanation][1] which says how to configurate the objectmapper.

I included the custom objectmapper as described [here][2].

However when the class `NumbersOfNewEvents` is serialized it still contains all attributes in the json.

Does anybody have a hint?
Thanks in advance

Jackson 1.8.0
spring 3.0.5

**CustomObjectMapper**

    public class CompanyObjectMapper extends ObjectMapper {
    	public CompanyObjectMapper() {
    		super();
    		setVisibilityChecker(getSerializationConfig()
    				.getDefaultVisibilityChecker()
    				.withCreatorVisibility(JsonAutoDetect.Visibility.NONE)
    				.withFieldVisibility(JsonAutoDetect.Visibility.NONE)
    				.withGetterVisibility(JsonAutoDetect.Visibility.NONE)
    				.withIsGetterVisibility(JsonAutoDetect.Visibility.NONE)
    				.withSetterVisibility(JsonAutoDetect.Visibility.DEFAULT));
    	}
    }


**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;
    	xmlns:mvc=&quot;http://www.springframework.org/schema/mvc&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-3.0.xsd
    		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd&quot;&gt;
    
    	&lt;context:component-scan base-package=&quot;de.Company.backend.web&quot; /&gt;
     
    	&lt;mvc:annotation-driven /&gt;
    	
    	&lt;bean
    		class=&quot;org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter&quot;&gt;
    		&lt;property name=&quot;messageConverters&quot;&gt;
    			&lt;list&gt;
    				&lt;bean class=&quot;org.springframework.http.converter.json.MappingJacksonHttpMessageConverter&quot;&gt;
    					&lt;property name=&quot;objectMapper&quot; ref=&quot;jacksonObjectMapper&quot; /&gt;
    				&lt;/bean&gt;
    			&lt;/list&gt;
    		&lt;/property&gt;
    	&lt;/bean&gt;
    	
    	&lt;bean id=&quot;jacksonObjectMapper&quot; class=&quot;de.Company.backend.web.CompanyObjectMapper&quot; /&gt;
    &lt;/beans&gt;

**NumbersOfNewEvents**

    public class NumbersOfNewEvents implements StatusAttribute {
    
    	public Integer newAccepts;
    	public Integer openRequests;
    	
    	public NumbersOfNewEvents() {
    		super();
    	}
    }

  [1]: http://wiki.fasterxml.com/JacksonFeatureAutoDetect &quot;explanation&quot;
  [2]: https://stackoverflow.com/questions/3591291/spring-jackson-and-customization-e-g-customdeserializer


Configuring ObjectMapper in Spring

I am looking among the standard libraries (like apache commons, jax, jboss, javax) for an interface or enum that lists the values of all the standard mime-type (aka content-type).

This interface should not be encumbered with too deep with other classes that would make it difficult to include the whole bunch as gwt source code.

for example

    interface ContentType{
      String JSON = &quot;Application/JSON&quot;;
      blah ... blah ...
    }

or,

    enum ContentType{
      JSON(&quot;Application/JSON&quot;),
      blah ... blah ...
    }




Interface/enum listing standard mime-type constants

I want to get two ints, one divided by the other to get a decimal or percentage.
How can I get a percentage or decimal of these two ints?
(I&#39;m not sure if it is right.. I&#39;m probably way off...)
for example:

    int correct = 25;
    int questionNum = 100;
    float percent = correct/questionNum *100;

This is how I thought I could do it, but it didn&#39;t work... I want to make the decimal (if there is one) into a percent out of 100 for example in this case it is %25. any ideas anyone?

Here is the correct code (thanks to Salvatore Previti!):
 
    float correct = 25;
    float questionNum = 100;
    float percent = (correct * 100.0f) / questionNum;
    

(btw, I am making a project using this for a quiz checking program that is why I need the percentage or decimal)

percentage of two int?

When you use `pip` to install a package, all the required packages will also be installed with it (dependencies). Does uninstalling that package also remove the dependent packages?

Does uninstalling a package with &quot;pip&quot; also remove the dependent packages?

I have a downloaded module repo, I want to install it locally, not globally in another directory? 

What is an easy way to do this?

Installing a local module using npm?

How can I load a bunch of packages at once with out retyping the require command over and over?  I&#39;ve tried three approaches all of which crash and burn.

Basically, I want to supply a vector of package names to a function that will load them.

    x&lt;-c(&quot;plyr&quot;, &quot;psych&quot;, &quot;tm&quot;)

    require(x)
    lapply(x, require)
    do.call(&quot;require&quot;, x)

Load multiple packages at once

I have an R script that is shared with several users on different computers. One of its lines contains the `install.packages(&quot;xtable&quot;)` command.

The problem is that every time someone runs the script, R spends a great deal of time apparently reinstalling the package (it actually does take some time, since the real case has vector of several packages).

How can I make first check if the packages are installed and then only run `install.packages()` for the ones that are not?

Check for installed packages before running install.packages()

You can compile Python in various ways. I&#39;d like to find out with which options my Python was compiled.

Concrete use-case: was my Python compiled with readline?
I know I can see this by doing &quot;import readline&quot;, but I&#39;d like to see a list of compilation setting for my Python binary.

Edit:
I mean the Python executable and **not** source code written by myself.

Content Type	Original Author	Original Content on Stackoverflow
Question	H2ONaCl	View Question on Stackoverflow
Solution 1 - Java	Matt Ball	View Answer on Stackoverflow
Solution 2 - Java	Sean Patrick Floyd	View Answer on Stackoverflow
Solution 3 - Java	Mathias Schwarz	View Answer on Stackoverflow

Is the use of Java's default package a bad practice?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Maven best practice for creating ad hoc zip artifact

is link / href with just parameters (starting with question mark) valid?

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