You can use a not (!) operator... but you have to use Spring 3.2 M1.

&gt; The following syntax is now supported
&gt; 
&gt;     &lt;beans profile=&quot;A,!B&quot;&gt;
&gt;     
&gt;     @Profile({&quot;A&quot;, &quot;!B&quot;})
&gt; 
&gt; indicating that the &lt;beans&gt; element or annotated component should be processed only if profile &#39;A&#39; is active or profile &#39;B&#39; is not active.


See change announced here: [Spring Framework 3.2 M1 Released][1]  
The commit is at GitHub: [Support not (!) operator for profile selection][2]  
Issue in JIRA: [SPR-8728][3]


If upgrading to Spring 3.2 is not possible for your project, I would recommend not using the `@Profile` approach and ensuring that the bean is not created in your Spring configuration.


  [1]: https://spring.io/blog/2012/05/29/spring-framework-3-2-m1-released
  [2]: https://github.com/SpringSource/spring-framework/commit/bcd44f3798ed06c0704d2a3564b8a9735e747e87
  [3]: https://jira.spring.io/browse/SPR-8728


Is there any way in Linux to assign one CPU core to a particular given process and there should not be any other processes or interrupt handlers to be scheduled on this core?

I have read about process affinity in Linux **Binding Processes to CPUs using the taskset utility** but that&#39;s not solving my problem because **it just try to affine the given process to that core but it is possible that other processes may be scheduled on this core** and this is what I want to avoid.

Should we change the kernel code for scheduling?

Whole one core dedicated to single process

Both types `Unit` and `Nothing` indicate a function that does not return anything. What&#39;s the difference between them?

What&#39;s the difference between Unit and Nothing?

In my application I use several [profiles](http://blog.springsource.com/2011/02/14/spring-3-1-m1-introducing-profile/) to make certain beans eligible for autowiring. What I&#39;m missing is the possibility to make a bean eligible for autowiring when a certain profile is NOT active. 

The best way of doing it that I thought about is like this:

1. Let&#39;s suppose we have a list of all possible profiles, e.g. {A, B, C, D}.
2. Profiles active for particular execution are {A, C}.
3. What I do is I create artificial profiles for all possible profiles which are not active. In the example case I would create {not_B, not_D} profiles.
4. The beans I want to be active based on not active profile `X` I make active for profile `not_X`. In my case if I wanted a bean to be eligible for autowiring when profile B is not active, I would annotate them `@Profile(&quot;not_B&quot;)`

This solution however requires an up-front knowledge about all possible profiles.

Can you think of any better solution?

Including bean definition when a profile is NOT active

In my application I use several <a href="http://blog.springsource.com/2011/02/14/spring-3-1-m1-introducing-profile/" target="_blank" rel="noopener noreferrer">profiles</a> to make certain beans eligible for autowiring. What I'm missing is the possibility to make a bean eligible for autowiring when a certain profile is NOT active.
The best way of doing it that I thought about is like this:
<ol>
<li>Let's suppose we have a list of all possible profiles, e.g. {A, B, C, D}.</li>
<li>Profiles active for particular execution are {A, C}.</li>
<li>What I do is I create artificial profiles for all possible profiles which are not active. In the example case I would create {not_B, not_D} profiles.</li>
<li>The beans I want to be active based on not active profile <code>X</code> I make active for profile <code>not_X</code>. In my case if I wanted a bean to be eligible for autowiring when profile B is not active, I would annotate them <code>@Profile("not_B")</code></li>
</ol>
This solution however requires an up-front knowledge about all possible profiles.
Can you think of any better solution?

I&#39;m using IDEA 12 Leda on Mountain Lion. I wanted to increase the maximum memory that IDE can use. I set the VMOptions in Info.plist file to be
`-Xmx2048m -ea -XX:+HeapDumpOnOutOfMemoryError -Xverify:none -Xbootclasspath/a:../lib/boot.jar`

When I open up IDEA, I still see the maximum memory to be 711m.

`jps -v` shows my VMOptions has been loaded but it&#39;s replaced by the following options.

    29388  **-Xmx2048m** -ea -XX:+HeapDumpOnOutOfMemoryError -Xverify:none -Xbootclasspath/a:../lib/boot.jar -Xms128m **-Xmx800m** -XX:MaxPermSize=350m -XX:ReservedCodeCacheSize=64m -XX:+UseCodeCacheFlushing -XX:+UseCompressedOops -Didea.paths.selector=IdeaIC12 -Dsun.java2d.noddraw=true -Didea.max.intellisense.filesize=2500 -Didea.dynamic.classpath=false -Didea.jars.nocopy=false -Dsun.java2d.d3d=false -Dapple.awt.fullscreencapturealldisplays=false -Dapple.laf.useScreenMenuBar=true -Djava.endorsed.dirs= -Dswing.bufferPerWindow=false -Didea.fatal.error.notification=enabled -Didea.cycle.buffer.size=1024 -Didea.popup.weight=heavy -Didea.xdebug.key=-Xdebug -Dapple.awt.graphics.UseQuartz=true -Dsun.java2d.pmoffscreen=false -Didea.no.launcher=false -DCVS_PASSFILE=~/.cvspass -Didea.use.default.antialiasing.in.editor=false -Dcom.apple.mrj.application.live-resize=false -Didea.smooth.progress=false
    29392 Jps -Dapplication.home=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home -Xms8m

Where does `-Xmx800` come from? I need to remove it.

How to increase IDE memory limit in IntelliJ IDEA on Mac?

I am trying to automate keystore generation using the Java keystore tool. The command I am using is :

    keytool -keystore keystore -alias jetty -genkey -keyalg RSA

But after this command, user is required to enter certain inputs as follows:

    Enter keystore password:  password
    What is your first and last name?  
    [Unknown]:  jetty.mortbay.org  
    What is the name of your organizational unit?  
    [Unknown]:  Jetty  
    What is the name of your organization?  
    [Unknown]:  Mort Bay Consulting Pty. Ltd.  
    What is the name of your City or Locality?  
    [Unknown]:  
    What is the name of your State or Province?  
    [Unknown]:  
    What is the two-letter country code for this unit?  
    [Unknown]:  
    Is CN=jetty.mortbay.org, OU=Jetty, O=Mort Bay Consulting Pty. Ltd.,  
    L=Unknown, ST=Unknown, C=Unknown correct?  
    [no]:  yes  

    Enter key password for &lt;jetty&gt;  
    (RETURN if same as keystore password):  password  

Instead of the user entering these values , is there any way of providing these values without user interaction ,either within the command or through a script?

Thanks


How to automate Keystore generation using the java keystore tool? w/o user interaction

I have been using the new [nested fragment][1] API that Android includes in the support library.

The problem that I am facing with nested fragments is that, if a nested fragment (that is, a fragment that has been added to another fragment via the `FragmentManager`returned by `getChildFragmentManager()`) calls `startActivityForResult()`, the nested fragment&#39;s `onActivityResult()` method is not called. However, both the parent fragment&#39;s `onActivityResult()` and activity&#39;s `onActivityResult()` do get called.

I don&#39;t know if I am missing something about nested fragments, but I did not expect the described behavior. Below is the code that reproduces this problem. I would very much appreciate if someone can point me in the right direction and explain to me what I am doing wrong:

&lt;!-- language: lang-java --&gt;

    package com.example.nestedfragmentactivityresult;
    
    import android.media.RingtoneManager;
    import android.os.Bundle;
    import android.content.Intent;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentActivity;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.widget.Toast;
    
    public class MainActivity extends FragmentActivity
    {
        public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            this.getSupportFragmentManager()
                .beginTransaction()
                .add(android.R.id.content, new ContainerFragment())
                .commit();
        }
    
        public void onActivityResult(int requestCode, int resultCode, Intent data)
        {
            super.onActivityResult(requestCode, resultCode, data);

            // This is called
            Toast.makeText(getApplication(),
                &quot;Consumed by activity&quot;,
                Toast.LENGTH_SHORT).show();
        }
    
        public static class ContainerFragment extends Fragment
        {
            public final View onCreateView(LayoutInflater inflater,
                                           ViewGroup container,
                                           Bundle savedInstanceState)
            {
                View result = inflater.inflate(R.layout.test_nested_fragment_container,
                    container,
                    false);
    
                return result;
            }
    
            public void onActivityCreated(Bundle savedInstanceState)
            {
                super.onActivityCreated(savedInstanceState);
                getChildFragmentManager().beginTransaction()
                    .add(R.id.content, new NestedFragment())
                    .commit();
            }
    
            public void onActivityResult(int requestCode,
                                         int resultCode,
                                         Intent data)
            {
                super.onActivityResult(requestCode, resultCode, data);

                // This is called
                Toast.makeText(getActivity(),
                    &quot;Consumed by parent fragment&quot;,
                    Toast.LENGTH_SHORT).show();
            }
        }
    
        public static class NestedFragment extends Fragment
        {
            public final View onCreateView(LayoutInflater inflater,
                                           ViewGroup container,
                                           Bundle savedInstanceState)
            {
                Button button = new Button(getActivity());
                button.setText(&quot;Click me!&quot;);
                button.setOnClickListener(new View.OnClickListener()
                {
                    public void onClick(View v)
                    {
                        Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
                        startActivityForResult(intent, 0);
                    }
                });
    
                return button;
            }
    
            public void onActivityResult(int requestCode,
                                         int resultCode,
                                         Intent data)
            {
                super.onActivityResult(requestCode, resultCode, data);

                // This is NOT called
                Toast.makeText(getActivity(),
                    &quot;Consumed by nested fragment&quot;,
                    Toast.LENGTH_SHORT).show();
            }
        }
    }

test_nested_fragment_container.xml is:

&lt;!-- language: lang-xml --&gt;

	&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
	&lt;FrameLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
	    android:id=&quot;@+id/content&quot;
	    android:layout_width=&quot;match_parent&quot;
	    android:layout_height=&quot;match_parent&quot; &gt;
	
	&lt;/FrameLayout&gt;


  [1]: http://developer.android.com/about/versions/android-4.2.html#NestedFragments

onActivityResult() not called in new nested fragment API

After formatting a datetime, the time displays AM or PM in upper case, but I want it in lower case like am or pm.

This is my code:

    public class Timeis {
        public static void main(String s[]) {
            long ts = 1022895271767L;
            String st = null;  
            st = new SimpleDateFormat(&quot; MMM d &#39;at&#39; hh:mm a&quot;).format(ts);
            System.out.println(&quot;time is &quot; + ts);  
        }
    }

Displaying AM and PM in lower case after date formatting

I have 

    LinkedHashMap&lt;String, List&lt;String&gt;&gt; hMap;

I want to get `List&lt;String&gt;` by **position** not on key.

I don&#39;t want to use iterate.

Is there any other way to get Value based on index ?


How get value from LinkedHashMap based on index not on key?

I am getting the following errors while trying my first spring project:

&lt;!-- language: none --&gt;

    Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element &#39;context:component-scan

Here is the `applicationContext.xml`:

&lt;!-- language: xml --&gt;

    &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:p=&quot;http://www.springframework.org/schema/p&quot;
           xmlns:aop=&quot;http://www.springframework.org/schema/aop&quot;
           xmlns:tx=&quot;http://www.springframework.org/schema/tx&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-2.5.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd&quot;&gt;
        
            &lt;context:component-scan base-package=&quot;com.xyz&quot; /&gt;
       
    &lt;/beans&gt;

What is causing the error?


The matching wildcard is strict, but no declaration can be found for element &#39;context:component-scan

I am using a JSP page to print an array of values. I&#39;m trying to use JSTL `&lt;c:forEach&gt;` for this.

    &lt;c:forEach items=&quot;${objects}&quot; var=&quot;object&quot;&gt;
        &lt;td&gt;${object.name} &lt;/td&gt;
    &lt;/c:forEach&gt;

The problem is my JSTL taglib declaration:

     &lt;%@ taglib prefix=&quot;c&quot; uri=&quot;http://java.sun.com/jsp/jstl/core&quot;%&gt;

The IDE shows an error on this line

&gt; Can not find the tag library descriptor.

Many of the forums point to the old Sun site to download the JSTL libraries. Now all of these links point to the Oracle home page with no link to JSTL binaries. This is leading me to believe there is a newer approach to accomplish this.

Sun JSTL taglib declaration fails with &quot;Can not find the tag library descriptor&quot;

Some days ago I began to study this Spring Hello World Tutorial: http://viralpatel.net/blogs/spring-3-mvc-create-hello-world-application-spring-3-mvc/

In this tutorial Spring DispatcherServlet is configured using the *spring-servlet.xml* file, this one: 

    &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:p=&quot;http://www.springframework.org/schema/p&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.xsd&quot;&gt;
 
    &lt;context:component-scan base-package=&quot;net.viralpatel.spring3.controller&quot; /&gt;
         
    &lt;bean id=&quot;viewResolver&quot;
        class=&quot;org.springframework.web.servlet.view.UrlBasedViewResolver&quot;&gt;
        &lt;property name=&quot;viewClass&quot;
            value=&quot;org.springframework.web.servlet.view.JstlView&quot; /&gt;
        &lt;property name=&quot;prefix&quot; value=&quot;/WEB-INF/jsp/&quot; /&gt;
        &lt;property name=&quot;suffix&quot; value=&quot;.jsp&quot; /&gt;
    &lt;/bean&gt;
&lt;/beans&gt;

In this file I am using the **context:component-scan** tag to say that Spring have to scan my file searching the annotation, so for example, when the controller class finds that a method is annotated by **@RequestMapping(&quot;/hello&quot;)** annotation knows that this method handles the HTTP Request toward the URL ending with &quot;/hello&quot;. This is simple...

Now my doubt is related to the Spring MVC template project that I could automatically build in STS\Eclipse. 

When I create a new Spring MVC project in STS I have that my *DispatcherServlet* is configured by a file named **servlet-context.xml** that contains some configuration similar to the previous example file.

In this file, I still have  the component scan tag:

    &lt;context:component-scan base-package=&quot;com.mycompany.maventestwebapp&quot; /&gt;

but I have also another tag (that look like have similar task), this one:

    &lt;annotation-driven /&gt;

What is the difference between these two tags?  
An other &quot;strange&quot; thing is that the previous example (that don&#39;t use the annotation-driven tag) is very similar to the project create by STS using the Spring MVC Template project but if I delete the annotation-driven tag from its configuration file the project don&#39;t run and give me the following error: **HTTP Status 404 -**

And in the stacktrace I have:

**WARN : org.springframework.web.servlet.PageNotFound - No mapping found for HTTP request with URI [/maventestwebapp/] in DispatcherServlet with name &#39;appServlet&#39;**

But why? The previous example works well without annotation-driven tag, and this controller class is very similar. In fact, there is only one method that handles HTTP request toward &quot;/&quot; path

This is the code of my controller class:

    package com.mycompany.maventestwebapp;

    import java.text.DateFormat;
    import java.util.Date;
    import java.util.Locale;

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;

    /**
     * Handles requests for the application home page.
    */
    @Controller
    public class HomeController {
	
	private static final Logger logger = LoggerFactory.getLogger(HomeController.class);
	
	/**
	 * Simply selects the home view to render by returning its name.
	 */
	@RequestMapping(value = &quot;/&quot;, method = RequestMethod.GET)
	public String home(Locale locale, Model model) {
		logger.info(&quot;Welcome home! The client locale is {}.&quot;, locale);
		
		Date date = new Date();
		DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, locale);
		
		String formattedDate = dateFormat.format(date);
		
		model.addAttribute(&quot;serverTime&quot;, formattedDate );
		
		return &quot;home&quot;;
	}
	
Can someone help me to understand this thing?

Thank you very much!

















Spring MVC: difference between &lt;context:component-scan&gt; and &lt;annotation-driven /&gt; tags?

What is the difference between `@RequestParam` and `@PathVariable` while handling special characters? 

`+` was accepted by `@RequestParam` as space. 

In the case of `@PathVariable`, `+` was accepted as `+`.

@RequestParam vs @PathVariable

I have following configuration class:

    @Configuration
    @PropertySource(name = &quot;props&quot;, value = &quot;classpath:/app-config.properties&quot;)
    @ComponentScan(&quot;service&quot;)
    public class AppConfig {

and I have service with property:

    @Component 
    public class SomeService {
        @Value(&quot;#{props[&#39;some.property&#39;]}&quot;) private String someProperty;

I receive error when I want to test the AppConfig configuration class with

    org.springframework.beans.factory.BeanCreationException: Error creating bean with name &#39;someService&#39;: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.lang.String service.SomeService.someProperty; nested exception is org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 0): Field or property &#39;props&#39; cannot be found on object of type &#39;org.springframework.beans.factory.config.BeanExpressionContext&#39; 

The issue is documented [in SPR-8539][1]


  [1]: https://jira.springsource.org/browse/SPR-8539 &quot;SPR-8539&quot;

but anyway I cannot figure out how to configure **PropertySourcesPlaceholderConfigurer**  to get it work.

Edit 1
------
This approach works well with xml configuration

    &lt;util:properties id=&quot;props&quot; location=&quot;classpath:/app-config.properties&quot; /&gt;
but I want to use java for configuration.

@Value not resolved when using @PropertySource annotation. How to configure PropertySourcesPlaceholderConfigurer?

I have two Spring profiles: `dev` and `test`. I want to set the active profile in the server environment, I don&#39;t want to set it in my code so that wherever I deploy my application the profile gets loaded based on the profile in the server.
 How can I do that?

Setting Spring Profile variable

I am just wondering what the **order of precedence is when multiple Spring active profiles have been specified**.

Say I want the `default` profile to be active but the `dev` profile to override it when there are several identical elements (beans for instance) to choose from but with different profiles...

Say for instance I have two `PropertySourcesPlaceholderConfigurer` beans configured with `&quot;default&quot;` and `&quot;dev&quot;` values a environment profiles.

If I use the following profile activation: `-Dspring.profiles.active=&quot;default,dev&quot;`

Will the `dev` profile override the `default` one?

If not how can the above behavior be achieved?

What is the order of precedence when there are multiple Spring&#39;s environment profiles as set by spring.profiles.active

I have an application with maven as a build tool.

I am using maven profiles to set up different properties from different profiles.

What i would like to do is that all active profiles in maven will be ported to spring active profiles as well so i can reference them in bean signature (`@profile`). but i am not sure how to do it.

for example: consider the following maven setup

&lt;!-- language: lang-xml --&gt;

 	&lt;profiles&gt;
		&lt;profile&gt;
			&lt;id&gt;profile1&lt;/id&gt;
			&lt;activation&gt;
				&lt;activeByDefault&gt;true&lt;/activeByDefault&gt;
			&lt;/activation&gt;
			&lt;properties&gt;
			&lt;/properties&gt;
		&lt;/profile&gt;
		&lt;profile&gt;
			&lt;id&gt;profile2&lt;/id&gt;
			&lt;properties&gt;
			&lt;/properties&gt;
		&lt;/profile&gt;
		&lt;profile&gt;
			&lt;id&gt;development&lt;/id&gt;
			&lt;activation&gt;
				&lt;activeByDefault&gt;true&lt;/activeByDefault&gt;
			&lt;/activation&gt;
     		&lt;properties&gt;
			&lt;/properties&gt;
		&lt;/profile&gt;
		&lt;profile&gt;
			&lt;id&gt;production&lt;/id&gt;
			&lt;properties&gt;	
			&lt;/properties&gt;
		&lt;/profile&gt;
	&lt;/profiles&gt;

assuming i run maven with out specifying any other profiles i would like for spring to have `profile1` and  `development` as active profiles.



How to set spring active profiles with maven profiles

I have a Spring project which uses another project. Each project has its own spring profile initialize from java code using `applicationContext.xml` and `*.properties` for each profile. I inject the profile from `args[]`. **The problem is that second project uses the default configuration for the env from the** `applicationContext.xml`
I can not inject the env from `args[]` to the second project and I tried looking for an article which will explain how Spring profile works.

 1. Is there a hierarchy on which it will look the profile when default is not configured at `applicationContext.xml` ?
 2. Is System var stronger than `applicationContext.xml` configuration?
 3. What you think is the best solution to my challenge?

Articles on that subject or even examples would be most appreciated!! 
Thanks in advance.   

 

How to set Spring profile from system variable?

I&#39;ve generated a Spring Boot web application using Spring Initializer, embedded Tomcat, Thymeleaf template engine.Technologies used:
Spring Boot 1.4.2.RELEASE, Spring 4.3.4.RELEASE, Thymeleaf 2.1.5.RELEASE, Tomcat Embed 8.5.6, Maven 3, Java 8

I have an SpringBoot app. with these 2 classes:

    @Profile(&quot;!war&quot;)
    @SpringBootApplication
    @Import({SecurityConfig.class ,PersistenceConfig.class, ServiceConfig.class})
    public class BookApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(BookApplication.class, args);
    	}
    }
    
    @Profile(&quot;war&quot;)
    @Import({SecurityConfig.class ,PersistenceConfig.class})
    @SpringBootApplication
    public class BookApplicationWar extends SpringBootServletInitializer {
    
    	@Override
        protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
            return application.sources(BookApplicationWar.class);
        }
    
        public static void main(String[] args) throws Exception {
            SpringApplication.run(BookApplicationWar.class, args);
        }
    	
    }


I generate the war with this command

     mvn clean package -DskipTests -Dspring.profiles.active=pebloc,war -DAPP-KEY=pebloc

But I got this error:

    [ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage (default) on project book: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.2.RELEASE:repackage failed: Unable to find a single main class from the following candidates [com.tdk.BookApplication, com.tdk.BookApplicationWar] -&gt; [Help 1]



SpringBoot: Unable to find a single main class from the following candidates

Can I use `~A` to invert a numpy array of booleans, instead of the rather awkward functions `np.logical_and()` and `np.invert()`? 

Indeed, `~` seems to work fine, but I can&#39;t find it in any nympy reference manual, and - more alarmingly - it certainly does _not_ work with scalars (e.g. `bool(~True)` returns `True` !), so I&#39;m a little bit worried ...

Inverting a numpy boolean array using ~

Given this input:

    [
      {
        &quot;Id&quot;: &quot;cb94e7a42732b598ad18a8f27454a886c1aa8bbba6167646d8f064cd86191e2b&quot;,
        &quot;Names&quot;: [
          &quot;condescending_jones&quot;,
          &quot;loving_hoover&quot;
        ]
      },
      {
        &quot;Id&quot;: &quot;186db739b7509eb0114a09e14bcd16bf637019860d23c4fc20e98cbe068b55aa&quot;,
        &quot;Names&quot;: [
          &quot;foo_data&quot;
        ]
      },
      {
        &quot;Id&quot;: &quot;a4b7e6f5752d8dcb906a5901f7ab82e403b9dff4eaaeebea767a04bac4aada19&quot;,
        &quot;Names&quot;: [
          &quot;jovial_wozniak&quot;
        ]
      },
      {
        &quot;Id&quot;: &quot;76b71c496556912012c20dc3cbd37a54a1f05bffad3d5e92466900a003fbb623&quot;,
        &quot;Names&quot;: [
          &quot;bar_data&quot;
        ]
      }
    ]

I&#39;m trying to construct a filter with [jq](http://stedolan.github.io/jq/) that returns all objects with `Id`s that **do not** contain &quot;data&quot; in the inner `Names` array, with the output being newline-separated.  For the above data, the output I&#39;d like is:

    cb94e7a42732b598ad18a8f27454a886c1aa8bbba6167646d8f064cd86191e2b
    a4b7e6f5752d8dcb906a5901f7ab82e403b9dff4eaaeebea767a04bac4aada19

I think I&#39;m somewhat close with this:

    (. - select(.Names[] contains(&quot;data&quot;))) | .[] .Id

but the `select` filter is not correct and it doesn&#39;t compile (get `error: syntax error, unexpected IDENT`).

How to filter an array of objects based on values in an inner array with jq?

Is there a short negation of `%in%` in R like `!%in%` or `%!in%`?


----------

Of course I can negate `c(&quot;A&quot;, &quot;B&quot;) %in% c(&quot;B&quot;, &quot;C&quot;)` by `!(c(&quot;A&quot;, &quot;B&quot;) %in% c(&quot;B&quot;, &quot;C&quot;))` (cf. [this question][1]) but I would prefere a more straight forward approach and save a pair of brackets (alike presumably most people would prefer `c(&quot;A&quot;, &quot;B&quot;) != c(&quot;B&quot;, &quot;C&quot;)` over `!(c(&quot;A&quot;, &quot;B&quot;) == c(&quot;B&quot;, &quot;C&quot;))`).


  [1]: https://stackoverflow.com/questions/5831794/opposite-of-in

Negation of %in% in R

In C/C++, why should one use `abs()` or `fabs()` to find the absolute value of a variable without using the following code?

    int absoluteValue = value &lt; 0 ? -value : value;

Does it have something to do with fewer instructions at lower level?

Why use abs() or fabs() instead of conditional negation?

So this is more of a theoretical question. C++ and languages (in)directly based on it (Java, C#, PHP) have [shortcut operators][1] for assigning the result of most binary operators to the first operand, such as

    a += 3;   // for a = a + 3
    a *= 3;   // for a = a * 3;
    a &lt;&lt;= 3;  // for a = a &lt;&lt; 3;

but when I want to toggle a boolean expression I always find myself writing something like

    a = !a;

which gets annoying when `a` is a long expression like.

    this.dataSource.trackedObject.currentValue.booleanFlag =
        !this.dataSource.trackedObject.currentValue.booleanFlag;

(yeah, Demeter&#39;s Law, I know). 

So I was wondering, *is there any language with a unary boolean toggle operator* that would allow me to abbreviate `a = !a` without repeating the expression for `a`, for example

    !=a;  
    // or
    a!!;

Let&#39;s assume that our language has a proper boolean type (like `bool` in C++) and that `a` is of that type (so no C-style `int a = TRUE`).

If you can find a documented source, I&#39;d also be interested to learn whether e.g. the C++ designers have considered adding an operator like that when `bool` became a built-in type and if so, why they decided against it.

---

(Note: I know that some people are of the opinion that assignment should not use 
`=` and that `++` and `+=` are not useful operators but design flaws; let&#39;s just assume I&#39;m happy with them and focus on why they would not extend to bools).


  [1]: https://en.cppreference.com/w/cpp/language/operator_assignment

Content Type	Original Author	Original Content on Stackoverflow
Question	ShyJ	View Question on Stackoverflow
Solution 1 - Java	aweigold	View Answer on Stackoverflow

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