Seems images are better way to answer this question.

1. Projects are greyed out when you ignore them in your IntelliJ workspace.

[![Ignored Projects][1]][1]

2. To add those projects or modules back in your workspace, right click on them and click on **unignore projects** as shown in below screenshot.

[![Ignored Projects back in Workspace][2]][2]

3. Alternatively, you can also go to File - Settings -&gt; Build, execution and deployment -&gt; Build Tools -&gt; Maven -&gt; Ignored Files, now select whichever projects/modules you may wish to retain in your IntelliJ workspace.

[![enter image description here][3]][3]

Feel free to ping in comments if more clarification required. Happy coding. 

  [1]: https://i.stack.imgur.com/jcq7z.png
  [2]: https://i.stack.imgur.com/pY2Vl.png
  [3]: https://i.stack.imgur.com/hKrmL.png

Right click on the pom -&gt; maven -&gt; unignore.  Then right click on pom -&gt; maven -&gt; reload project.

Seems some kind of bug when you open a child subdirectory then open the parent in IntelliJ.

This is known issue and interlinked to 3 more IDEA issue. You can find more details here.

[Indicate that pom.xml is ignored when editing it][1]

  [1]: https://youtrack.jetbrains.com/issue/IDEA-164626

Lot of us might spend more time and then end up deleting module &amp; re-creating it.
But @Pratik Ambani solutions works great!!, option 3 worked in my case.

I&#39;m running Docker on CentOS 7, from time to time there&#39;s the following message displayed:

    Message from syslogd@dev-master at Mar 29 17:23:03 ...
      kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1

I&#39;ve googled a lot, read a lot of resources found and tried many ways like keeping my system updated, upgrading kernel etc, but the message still keeps showing up, it&#39;s not too often but sooner or later I&#39;ll see it. Also I found [issue for this problem on docker github][1] is still open, then my questions are:

1. What does this message mean? Could somebody give me a simple explanation why docker causes it?
2. Is there any workaround for this?
3. If it could not be fixed yet(the issue is still open), will it affect the server or services running inside docker container? Will it be a serious performance issue because it also happens on our production servers? 

Docker version:

    Client:
     Version:      1.11.1
     API version:  1.23
     Go version:   go1.5.4
     Git commit:   5604cbe
     Built:        Wed Apr 27 00:34:42 2016
     OS/Arch:      linux/amd64

    Server:
     Version:      1.11.1
     API version:  1.23
     Go version:   go1.5.4
     Git commit:   5604cbe
     Built:        Wed Apr 27 00:34:42 2016
     OS/Arch:      linux/amd64

OS info: 

    CentOS 7, with kernel version: 4.6.0-1.el7.elrepo.x86_64

I really appreciate for any info/tips or resources, thanks a lot. 


  [1]: https://github.com/docker/docker/issues/5618

Docker on CentOS 7.2: kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1

Recently I sometimes got this exception when MainActivity called onResume().

    java.lang.RuntimeException: Unable to resume activity {com.qau4d.c35s3.androidapp/com.xxx.XXX.XXX.MainActivity}: java.lang.IllegalArgumentException
	at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3400)
	at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3440)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1510)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:154)
	at android.app.ActivityThread.main(ActivityThread.java:6077)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
    Caused by: java.lang.IllegalArgumentException
	at android.os.Parcel.readException(Parcel.java:1687)
	at android.os.Parcel.readException(Parcel.java:1636)
	at android.app.ActivityManagerProxy.isTopOfTask(ActivityManagerNative.java:5475)
	at android.app.Activity.isTopOfTask(Activity.java:5961)
	at android.app.Activity.onResume(Activity.java:1252)
	at com.qau4d.c35s3.androidapp.onResume(XActivity.java:29)
	at com.qau4d.c35s3.androidapp.onResume(MainActivity.java:196)
	at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1269)
	at android.app.Activity.performResume(Activity.java:6768)
	at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3377)

Both in `MainActivity` and super class `XActivity`, only `super.onResume();` is called. It&#39;s really strange to get this exception after a long time normal development.I checked some relative reference material but nothing got.


java.lang.RuntimeException: Unable to resume activity with java.lang.IllegalArgumentException

Why are some maven projects in IntelliJ greyed out?

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/ttD2Q.png

Why are some maven projects in IntelliJ grayed out?

<p>Why are some maven projects in IntelliJ greyed out?</p>
<p><a href="https://i.stack.imgur.com/ttD2Q.png" target="_blank" rel="noopener noreferrer"><img src="https://i.stack.imgur.com/ttD2Q.png" alt="enter image description here"></a></p>


I&#39;m a bit confused with these two APIs.

**[ResourcesCompat.getDrawable(Resources res, int id, Resources.Theme theme)][1]**

&gt; Return a drawable object associated with a particular resource ID and styled for the specified theme. Various types of objects will be returned depending on the underlying resource -- for example, a solid color, PNG image, scalable image, etc.
&gt;
&gt; Prior to API level 21, the theme will not be applied and this method simply calls through to getDrawable(int).


**[AppCompatResources.getDrawable(Context context, int resId)][2]**

&gt; Return a drawable object associated with a particular resource ID.
&gt;
&gt; This method supports inflation of **vector** and **animated-vector** resources on devices where platform support is not available.

## Question ##

 1. What is the significant difference between these two classes
    (besides **vector** inflation)?
 2. Which one should I prefer to another and why?

  [1]: https://developer.android.com/reference/android/support/v4/content/res/ResourcesCompat.html#getDrawable(android.content.res.Resources,%20int,%20android.content.res.Resources.Theme)
  [2]: https://developer.android.com/reference/android/support/v7/content/res/AppCompatResources.html#getDrawable(android.content.Context,%20int)

ResourcesCompat.getDrawable() vs AppCompatResources.getDrawable()

I can&#39;t get my head around the difference between `thenApply` and `thenCompose`. 

So, could someone provide a valid use case? 

From the Java docs:

    thenApply(Function&lt;? super T,? extends U&gt; fn)

&gt; Returns a new `CompletionStage` that, when this stage completes
&gt; normally, is executed with this stage&#39;s result as the argument to the
&gt; supplied function.

    thenCompose(Function&lt;? super T,? extends CompletionStage&lt;U&gt;&gt; fn)

&gt; Returns a new `CompletionStage` that, when this stage completes
&gt; normally, is executed with this stage as the argument to the supplied
&gt; function.

I get that the 2nd argument of `thenCompose` extends the CompletionStage where `thenApply` does not. 

Could someone provide an example in which case I have to use `thenApply` and when `thenCompose`?

CompletableFuture | thenApply vs thenCompose

Starting with the following code...

	byte foo = 1;
	byte fooFoo = foo + foo;

When I try compiling this code I will get the following error...

&gt; Error:(5, 27) java: incompatible types: possible lossy conversion from int to byte

... but if `foo` is final...

	final byte foo = 1;
	final byte fooFoo = foo + foo;

the file will compile successfully.

Moving on to the following code...

	final byte[] fooArray = new byte[1];
	fooArray[0] = 1;

	final byte foo = fooArray[0];
	fooArray[0] = 127;

	System.out.println(&quot;foo is: &quot; + foo);

... will print 

    foo is: 1

... which is fine. The value is copied to a final variable and it can not be changed any more. Playing with the value in the array does not change the value of the `foo` (as expected...).

Why does the following require a cast?

	final byte[] fooArray = new byte[1];
	fooArray[0] = 1;
	final byte foo = fooArray[0];
	final byte fooFoo = foo + foo;

How is this different than the second example in this question? Why is the compiler giving me the following error?

&gt; Error:(5, 27) java: incompatible types: possible lossy conversion from int to byte

How can this happen?



Why does Java require an explicit cast on a final variable if it was copied from an array?

I am having trouble with anti-aliased text in IntelliJ IDEA. That thing for some reason ships with its own version of OpenJDK 8. Anyway... sub-pixel aliasing is acceptable with dark-on-bright text:

[![enter image description here][1]][1]

But the gamma is wrong for bright-on-dark text:

[![enter image description here][2]][2]

Which means in this scheme, text looks as if it was bold-face and horizontally smeared/fuzzy.

Is it possible to specify a system property or hack the system otherwise to change the gamma for AA interpolation towards darker colours? I already choose a very fine font (FicaCode Light), there is simply no font that shows less bold on this computer (Linux with Gnome 3, 1920x1080 display).

----

__Edit:__ I am really looking for a way to control the AA gamma. I have not used IDEA 2017.1 EAP, but the release version which comes already with the &#39;fixed&#39; bundled tuned version 1.8.0_112, that is mentioned in the gist comment. If I download that version, I get exactly the same pixel output as the two images above. These are the `idea64.jvmoptions`:

# custom IntelliJ IDEA VM options

    -Xms128m
    -Xmx750m
    -XX:ReservedCodeCacheSize=240m
    -XX:+UseConcMarkSweepGC
    -XX:SoftRefLRUPolicyMSPerMB=50
    -ea
    -Dsun.io.useCanonCaches=false
    -Djava.net.preferIPv4Stack=true
    -XX:+HeapDumpOnOutOfMemoryError
    -XX:-OmitStackTraceInFastThrow
    -Dawt.useSystemAAFontSettings=lcd
    -Dsun.java2d.renderer=sun.java2d.marlin.MarlinRenderingEngine
    -Djava2d.font.loadFontConf=false

Adding or removing the last property simply makes zero difference, also changing from `lcd` to `on` or `off` has zero effect.

Compare these pictures to the regular OpenJDK 1.8.0_121 that I installed via Debian:

[![enter image description here][3]][3]

Clearly here the AA is broken (at 1:1 it looks totally coloured). So I think the subpixel rendering of the bundled version is basically _correct_. Only it uses the wrong gamma for light text on dark background.

----------------

__Edit:__ After more investigation, the problem boils down to this: I can use a custom `font.conf` file with `hintstyle` between `hintslight`, `hintmedium` and `hintfull`. For slight hinting, the font looks balanced in terms of aspect ratio, but the anti-aliasing has wrong gamma, and so the font lines are thick (everything looks bold face). For medium or full hinting, the font appears more thin-lined and sharp, but now the aspect ratio is broken, the font is too wide.

  [1]: https://i.stack.imgur.com/lICbo.png
  [2]: https://i.stack.imgur.com/1z2qZ.png
  [3]: https://i.stack.imgur.com/g6u6A.png


Setting LCD gamma / contrast (IntelliJ IDEA, JDK 8)

Java 9&#39;s `javac` has a new flag `--release`:

    &gt; javac --help
    ...

    --release &lt;release&gt;
        Compile for a specific VM version. Supported targets: 6, 7, 8, 9

How is it different from `-source` and `-target` flags? Is it just a shortcut for `-source X -target X`?

What is the --release flag in the Java 9 compiler?

I am  trying to set up maven for my project and I am getting this error 

&quot;JAVA_HOME should point to a JDK not a JRE&quot; 

I know there are already similar question but it did not work. How can I point JAVA_HOME to JDK in windows. I am using IntelliJ IDEA

JAVA_HOME should point to a JDK not a JRE

I have found [this][1] similar question regarding Android, but I am using plain Java with Maven as build tool. I think it is better to post a new question.

I have created a Kotlin class to which I am trying to refer from Java class as `MyKotlinClass.class`. The Maven build fails, whereas compilation in IntelliJ Idea works fine. I have already added Kotlin plugin to maven:

            &lt;plugin&gt;
                &lt;groupId&gt;org.jetbrains.kotlin&lt;/groupId&gt;
                &lt;artifactId&gt;kotlin-maven-plugin&lt;/artifactId&gt;
                &lt;version&gt;${kotlin.version}&lt;/version&gt;
                &lt;executions&gt;
                    &lt;execution&gt;
                        &lt;id&gt;compile&lt;/id&gt;
                        &lt;phase&gt;compile&lt;/phase&gt;
                        &lt;goals&gt;
                            &lt;goal&gt;compile&lt;/goal&gt;
                        &lt;/goals&gt;
                    &lt;/execution&gt;
                    &lt;execution&gt;
                        &lt;id&gt;test-compile&lt;/id&gt;
                        &lt;phase&gt;test-compile&lt;/phase&gt;
                        &lt;goals&gt;
                            &lt;goal&gt;test-compile&lt;/goal&gt;
                        &lt;/goals&gt;
                    &lt;/execution&gt;
                &lt;/executions&gt;
            &lt;/plugin&gt;

However that does not help:

    [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project app: Compilation failure
    [ERROR] MyClassLinkingKotlin.java:[100,40] error: cannot find symbol


The line/column exactly refers to symbol `MyKotlinClass.class`. It will fail even when using like this:

    System.err.println(MyKotlinClass.class)


  [1]: https://stackoverflow.com/questions/37946305/how-to-solve-error-cannot-find-symbol-class-after-converting-java-class

Using Kotlin class in Java: Cannot find symbol

**Issue:** 

I am getting the Maven error &quot;The JAVA_HOME environment variable is not defined correctly&quot; when I run through Inno setup batch execution. However, I am able to run successfully outside Inno Setup.(e.g Command line, Batch file, Vbs). I am clueless to identify the issue.

**Inno Setup Invoked Prompt:**

    C:\&gt;mvn -version
    The JAVA_HOME environment variable is not defined correctly
    This environment variable is needed to run this program
    NB: JAVA_HOME should point to a JDK not a JRE

**Regular Command Prompt:**

    C:\&gt;mvn -version
    C:\
    Apache Maven 3.5.0 (ff8f5e7444045639af65f6095c62210b5713f426; 2017-04-04T01:09:06+05:30)
    Maven home: C:\Program Files\apache-maven-3.5.0\bin\..
    Java version: 1.8.0_131, vendor: Oracle Corporation
    Java home: C:\Program Files\Java\jdk1.8.0_131\jre
    Default locale: en_US, platform encoding: Cp1252
    OS name: &quot;windows 7&quot;, version: &quot;6.1&quot;, arch: &quot;amd64&quot;, family: &quot;windows&quot;

**Maven Command from InnoSetup:**

    [Files]
    Source: &quot;C:\@Setup\MavenInstaller.bat&quot;; DestDir: &quot;{tmp}&quot;; Flags: ignoreversion
    [Run]
    Filename: &quot;{cmd}&quot;; Parameters: &quot;/C &quot;&quot;{tmp}\MavenInstaller.bat&quot;&quot;&quot;

**Maven Command from Batch File:**

    mvn archetype:generate -DgroupId=com.mycompany.mycomponent-DartifactId=%APPLICATION_NAME% -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

**Setting JAVA_HOME**

Check the If Java 1.8 is installed or not. If not installed, Install the same and set the JAVA HOME as follows.

    SETX JAVA_HOME &quot;C:\Program Files\Java\jdk1.8.0_131&quot;
    SETX -m JAVA_HOME &quot;C:\Program Files\Java\jdk1.8.0_131&quot;
    REG ADD &quot;HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment&quot; /v Path /t REG_SZ /d &quot;%path%;C:\Program Files\Java\jdk1.8.0_131\bin;&quot; /f

Many Thanks.







How do I fix maven error The JAVA_HOME environment variable is not defined correctly?

I have updated my dependecies like you said in your comment and i have this now :


    org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:536) ~[spring-context-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at com.o2xp.ats.accountManager.test.App.main(App.java:42) [classes/:na]
    Caused by: org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
    	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.initialize(TomcatEmbeddedServletContainer.java:123) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.&lt;init&gt;(TomcatEmbeddedServletContainer.java:84) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getTomcatEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:554) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:179) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:164) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	... 8 common frames omitted
    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name &#39;httpPutFormContentFilter&#39; defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.filter.OrderedHttpPutFormContentFilter]: Factory method &#39;httpPutFormContentFilter&#39; threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:586) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1262) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1110) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:305) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:233) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:303) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:234) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAsRegistrationBean(ServletContextInitializerBeans.java:182) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAsRegistrationBean(ServletContextInitializerBeans.java:177) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addAdaptableBeans(ServletContextInitializerBeans.java:159) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.&lt;init&gt;(ServletContextInitializerBeans.java:80) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getServletContextInitializerBeans(EmbeddedWebApplicationContext.java:241) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.selfInitialize(EmbeddedWebApplicationContext.java:228) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.access$000(EmbeddedWebApplicationContext.java:89) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext$1.onStartup(EmbeddedWebApplicationContext.java:213) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.context.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:55) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5196) ~[tomcat-embed-core-8.5.14.jar:8.5.14]
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-8.5.14.jar:8.5.14]
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419) ~[tomcat-embed-core-8.5.14.jar:8.5.14]
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409) ~[tomcat-embed-core-8.5.14.jar:8.5.14]
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_131]
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_131]
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_131]
    	at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_131]
    Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.filter.OrderedHttpPutFormContentFilter]: Factory method &#39;httpPutFormContentFilter&#39; threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
    	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:182) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:575) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	... 26 common frames omitted
    Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
    	at org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter.&lt;init&gt;(AllEncompassingFormHttpMessageConverter.java:67) ~[spring-web-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.web.filter.HttpPutFormContentFilter.&lt;init&gt;(HttpPutFormContentFilter.java:63) ~[spring-web-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.boot.web.filter.OrderedHttpPutFormContentFilter.&lt;init&gt;(OrderedHttpPutFormContentFilter.java:29) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    	at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration.httpPutFormContentFilter(WebMvcAutoConfiguration.java:149) ~[spring-boot-autoconfigure-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    	at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$$EnhancerBySpringCGLIB$$d0610338.CGLIB$httpPutFormContentFilter$1(&lt;generated&gt;) ~[spring-boot-autoconfigure-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    	at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$$EnhancerBySpringCGLIB$$d0610338$$FastClassBySpringCGLIB$$3e6bfe4d.invoke(&lt;generated&gt;) ~[spring-boot-autoconfigure-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:359) ~[spring-context-5.0.0.RC2.jar:5.0.0.RC2]
    	at org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$$EnhancerBySpringCGLIB$$d0610338.httpPutFormContentFilter(&lt;generated&gt;) ~[spring-boot-autoconfigure-1.5.4.RELEASE.jar:1.5.4.RELEASE]
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]
    	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]
    	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:155) ~[spring-beans-5.0.0.RC2.jar:5.0.0.RC2]
    	... 27 common frames omitted
    Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.exc.InvalidDefinitionException
    	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_131]
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_131]
    	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) ~[na:1.8.0_131]
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_131]
    	... 41 common frames omitted

And ther is my new pom : 

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
    &lt;project xmlns=&quot;http://maven.apache.org/POM/4.0.0&quot; xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot; xsi:schemaLocation=&quot;http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd&quot;&gt;
      &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
       &lt;build&gt;
            &lt;plugins&gt;
                &lt;plugin&gt;
                    &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                    &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
                    &lt;configuration&gt;
                        &lt;source&gt;1.8&lt;/source&gt;
                        &lt;target&gt;1.8&lt;/target&gt;   
                    &lt;/configuration&gt;
                &lt;/plugin&gt;
               &lt;plugin&gt;
                  &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;  
                  &lt;artifactId&gt;spring-boot-maven-plugin&lt;/artifactId&gt;
               &lt;/plugin&gt;
           &lt;/plugins&gt;
       &lt;/build&gt;
      &lt;packaging&gt;pom&lt;/packaging&gt;
      &lt;groupId&gt;com.o2xp&lt;/groupId&gt;
      &lt;artifactId&gt;ats-impl&lt;/artifactId&gt;
      &lt;version&gt;0.0.1-SNAPSHOT&lt;/version&gt;
      &lt;name&gt;ats-impl&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;org.springframework.boot&lt;/groupId&gt;
        	&lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt;
        	&lt;version&gt;1.5.3.RELEASE&lt;/version&gt;
    	&lt;/dependency&gt;
        &lt;dependency&gt;
          &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
          &lt;artifactId&gt;spring-boot-starter-data-jpa&lt;/artifactId&gt;
          &lt;version&gt;1.5.3.RELEASE&lt;/version&gt;
        &lt;/dependency&gt;
        &lt;dependency&gt;
          &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
          &lt;artifactId&gt;spring-boot-starter-test&lt;/artifactId&gt;
          &lt;version&gt;1.5.3.RELEASE&lt;/version&gt;
          &lt;scope&gt;test&lt;/scope&gt;
        &lt;/dependency&gt;
        &lt;dependency&gt;
        	&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
        	&lt;artifactId&gt;spring-boot&lt;/artifactId&gt;
        	&lt;version&gt;1.5.3.RELEASE&lt;/version&gt;
    	&lt;/dependency&gt;
        &lt;dependency&gt;
        	&lt;groupId&gt;org.mapstruct&lt;/groupId&gt;
        	&lt;artifactId&gt;mapstruct-processor&lt;/artifactId&gt;
        	&lt;version&gt;1.1.0.Final&lt;/version&gt;
    	&lt;/dependency&gt;
    	&lt;dependency&gt;
        	&lt;groupId&gt;io.github.jhipster&lt;/groupId&gt;
        	&lt;artifactId&gt;jhipster&lt;/artifactId&gt;
        	&lt;version&gt;1.1.6&lt;/version&gt;
    	&lt;/dependency&gt;
      &lt;/dependencies&gt;
       &lt;repositories&gt;
            &lt;repository&gt;
                &lt;id&gt;spring-releases&lt;/id&gt;
                &lt;name&gt;Spring Releases&lt;/name&gt;
                &lt;url&gt;https://repo.spring.io/libs-release&lt;/url&gt;
            &lt;/repository&gt;
            &lt;repository&gt;
                &lt;id&gt;org.jboss.repository.releases&lt;/id&gt;
                &lt;name&gt;JBoss Maven Release Repository&lt;/name&gt;
                &lt;url&gt;https://repository.jboss.org/nexus/content/repositories/releases&lt;/url&gt;
            &lt;/repository&gt;
            &lt;repository&gt;
            	&lt;id&gt;spring-milestone&lt;/id&gt;
            	&lt;name&gt;Spring Milestone Repository&lt;/name&gt;
            	&lt;url&gt;https://repo.spring.io/milestone&lt;/url&gt;
            &lt;/repository&gt;
        &lt;/repositories&gt;
    
        &lt;pluginRepositories&gt;
            &lt;pluginRepository&gt;
                &lt;id&gt;spring-releases&lt;/id&gt;
                &lt;name&gt;Spring Releases&lt;/name&gt;
                &lt;url&gt;https://repo.spring.io/libs-release&lt;/url&gt;
            &lt;/pluginRepository&gt;
        &lt;/pluginRepositories&gt;
      &lt;modules&gt;
        &lt;module&gt;ats-application-context&lt;/module&gt;
        &lt;module&gt;ats-notice-manager&lt;/module&gt;
        &lt;module&gt;ats-common&lt;/module&gt;
        &lt;module&gt;ats-accountManager&lt;/module&gt;
      &lt;/modules&gt;
    &lt;/project&gt;


i have to precise that i never used jackson and it was working verry well. Maybe it&#39;s cause auf spring 5 ?

Java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException

I scaffold an app using jhipster which is microservice gateway using cassandra db and using maven to build which was building fine after scaffold.i ran gulp command to for the live reload of ui.

i made a change slighlty in navbar and home page of it.
which was also working file &amp; made some changes in the json files of home &amp; navbar &amp; do some minor changes as adding the search box and other.

it failed to reload. I stop the gulp &amp; maven &amp; restarted them.
maven is building but again not loading the site in localhost 

when i ran gulp it is showing me this error.

     gulp
    fs.js:952
      return binding.readdir(pathModule._makeLong(path), options.encoding);
                     ^
    
    Error: ENOENT: no such file or directory, scandir &#39;/home/hartron/foodnetteam/codebase/mandi/node_modules/node-sass/vendor&#39;
        at Error (native)
        at Object.fs.readdirSync (fs.js:952:18)
        at Object.getInstalledBinaries (/home/hartron/foodnetteam/codebase/mandi/node_modules/node-sass/lib/extensions.js:121:13)
        at foundBinariesList (/home/hartron/foodnetteam/codebase/mandi/node_modules/node-sass/lib/errors.js:20:15)
        at foundBinaries (/home/hartron/foodnetteam/codebase/mandi/node_modules/node-sass/lib/errors.js:15:5)
        at Object.module.exports.missingBinary (/home/hartron/foodnetteam/codebase/mandi/node_modules/node-sass/lib/errors.js:45:5)
        at module.exports (/home/hartron/foodnetteam/codebase/mandi/node_modules/node-sass/lib/binding.js:15:30)
        at Object.&lt;anonymous&gt; (/home/hartron/foodnetteam/codebase/mandi/node_modules/node-sass/lib/index.js:14:35)
        at Module._compile (module.js:570:32)
        at Object.Module._extensions..js (module.js:579:10)


Could anyone tell me solution for this

Error: ENOENT: no such file or directory, scandir

Unlike Netbeans, in Jetbrains IDEs, the setting files related to user and team are mixed in the same folder that makes it tricky when you need to push them to git. 

There is a number of sample git ignore files for these IDEs and https://intellij-support.jetbrains.com/hc/articles/206544839 page on git site. 

However, after using them for a months we figure out that it is safer and actually more convenient to do the reverse. I mean ignoring all `.idea` files and adding only team-related settings explicitly. (instead of adding all and ignoring some). 

The main thing that can be shared among developers is code style configs. So, by using IDE auto-reformatting option all the team will follow a consistent style. 

Besides that, the question is which other files are recommended to be included and not ignored? Why?

Answer: I came across with this: https://github.com/salarmehr/idea-gitignore

Which files in .idea folder should be tracked by Git?

I am trying to import Gradle project in Intellij Idea with local Gradle distrib and getting stacktrace with the following message: `Could not target platform: &#39;Java SE 8&#39; using tool chain: &#39;JDK 7 (1.7)&#39;`.
Could anyone explain please what could be the reason? 


 

Gradle - Could not target platform: &#39;Java SE 8&#39; using tool chain: &#39;JDK 7 (1.7)&#39;

I&#39;m having difficulties in debugging a Java spring-boot application on IntelliJ IDEA community Edition. The main problem is, that the IDE won&#39;t stop on a breakpoint, even the program surely executes through it. How can I make the the IntelliJ IDEA to stop on the breakpoint?

As additional information, here is my run configurations:

Maven configuration with a command as: spring-boot:run. Before launch I build the project.

Content Type	Original Author	Original Content on Stackoverflow
Question	powder366	View Question on Stackoverflow
Solution 1 - Java	Pratik Ambani	View Answer on Stackoverflow
Solution 2 - Java	rogerdpack	View Answer on Stackoverflow
Solution 3 - Java	Vishwas Shenoy Alevoor	View Answer on Stackoverflow

Why are some maven projects in IntelliJ grayed out?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

java.lang.RuntimeException: Unable to resume activity with java.lang.IllegalArgumentException

Docker on CentOS 7.2: kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1

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