**Important note: This will wipe the shelf, local history, and potentially other cached data.**

File menu &gt; Invalidate caches and restart. The PSI cache is one of the caches that are affected by this command, so this should fix it up.

Whenever I navigated to a class, I&#39;d get this PSI error. Clicking the details in Android Studio, it included the following:

`viewProvider=SingleRootFileViewProvider{myVirtualFile=jar://&lt;user-directory&gt;/.gradle/caches/modules-2/files-2.1/com.squareup.haha/haha/2.0.3/e0672395ac43377f2510b14839342a24fdf35c18/haha-2.0.3-sources.jar!/com/squareup/haha/guava/io/GwtWorkarounds.java, content=VirtualFileContent{size=5678}}`

Based on this info, I tried deleting `&lt;user-directory&gt;/.gradle/caches/modules-2` and restarting Android Studio and it seemed to fix the PSI error, and it didn&#39;t seem to delete local history (though I don&#39;t know if anything else important was deleted).

Invalidating caches didn&#39;t work for me.
Only a complete re-install of AS and all relevant SDK, Gradle etc... did the trick.
I started by uninstalling AS.
Then I manually deleted the SDK folder.
I also deleted the .gradle and .android folders in my C:/Users/[my.user]/ folder.


TypeScript has a bunch of different ways to define an enum:

    enum Alpha { X, Y, Z }
    const enum Beta { X, Y, Z }
    declare enum Gamma { X, Y, Z }
    declare const enum Delta { X, Y, Z }

If I try to use a value from `Gamma` at runtime, I get an error because `Gamma` is not defined, but that&#39;s not the case for `Delta` or `Alpha`? What does `const` or `declare` mean on the declarations here?

There&#39;s also a `preserveConstEnums` compiler flag -- how does this interact with these?


How do the different enum variants work in TypeScript?

I cannot find a way of moving docker running containers from one host to another.

Is there any way I can push my containers to repositories like we do for images ?
Currently, I am not using data volumes to store the data associated with applications running inside containers. So some data resides inside containers, which I want to persist before redesigning the setup.


How to move Docker containers between different hosts?

Whenever I clean my project is says: PSI and index do not match
What should I do?

PSI and index do not match: PSI and index do not match on Android Studio

<p>Whenever I clean my project is says: PSI and index do not match
What should I do?</p>


For **java.util.Date** when I do  
  

    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = &quot;dd/MM/yyyy&quot;)  
      private Date dateOfBirth;

  

then in JSON request when I send   

    { {&quot;dateOfBirth&quot;:&quot;01/01/2000&quot;} }  

it works.

How should I do this for **Java 8&#39;s LocalDate** field??

I tried having   
  

    @JsonDeserialize(using = LocalDateDeserializer.class)  
    @JsonSerialize(using = LocalDateSerializer.class)  
    private LocalDate dateOfBirth;  

It didn&#39;t work.

Can someone please let me know what&#39;s the right way to do this..  

Below are dependencies
 

    &lt;dependency&gt;
        &lt;groupId&gt;org.jboss.resteasy&lt;/groupId&gt;
        &lt;artifactId&gt;jaxrs-api&lt;/artifactId&gt;
         &lt;version&gt;3.0.9.Final&lt;/version&gt;
    &lt;/dependency&gt;
    &lt;dependency&gt;
        &lt;groupId&gt;com.fasterxml.jackson.jaxrs&lt;/groupId&gt;
        &lt;artifactId&gt;jackson-jaxrs-json-provider&lt;/artifactId&gt;
        &lt;version&gt;2.4.2&lt;/version&gt;
    &lt;/dependency&gt;
    &lt;dependency&gt;
        &lt;groupId&gt;com.wordnik&lt;/groupId&gt;
        &lt;artifactId&gt;swagger-annotations&lt;/artifactId&gt;
        &lt;version&gt;1.3.10&lt;/version&gt;
    &lt;/dependency&gt;


Java 8 LocalDate Jackson format

I&#39;ve searched around Oracle&#39;s sites and cannot find the actual executable to download. I get sites that point to older versions, or to the source of Scene Builder instead. I&#39;m looking for the actual windows/mac executable installer for the latest version of Scene Builder.

Where exactly can I download the latest version of Scene Builder for Java?

Java 8&#39;s `LocalDateTime` has an `ofEpochSecond` method. Unfortunately, there is no such method in the `ZonedDateTime`. Now, I have an Epoch value and an explicit `ZoneId` given. How do I get a `ZonedDateTime` out of these?

Java 8: How to create a ZonedDateTime from an Epoch value?

![enter image description here][1]I have imported the jenkins jobs from existing jenkins server from another machine. But the problem is, it has the JDK referenced as per the old machines and I want to change it to use the JDK configured in my new jenkins. But I am unable to find any way of doing this. So, please if you have come across this situation and found a way then please help me too.

Thanks.


  [1]: http://i.stack.imgur.com/4oSiR.png

How to change the JDK for a Jenkins job?

I&#39;ve been working with the new [Optional type in Java 8](https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html), and I&#39;ve come across what seems like a common operation that isn&#39;t supported functionally: an &quot;orElseOptional&quot;

Consider the following pattern:

    Optional&lt;Result&gt; resultFromServiceA = serviceA(args);
    if (resultFromServiceA.isPresent) return result;
    else {
        Optional&lt;Result&gt; resultFromServiceB = serviceB(args);
        if (resultFromServiceB.isPresent) return resultFromServiceB;
        else return serviceC(args);
    }

There are many forms of this pattern, but it boils down to wanting an &quot;orElse&quot; on an optional that takes a function producing a new optional, called only if the current one does not exist.

It&#39;s implementation would look like this:

    public Optional&lt;T&gt; orElse(Supplier&lt;Optional&lt;? extends T&gt;&gt; otherSupplier) {
        return value != null ? this : other.get();
    }

I&#39;m curious if there&#39;s a reason such a method doesn&#39;t exist, if I&#39;m just using Optional in an unintended way, and what other ways people have come up with to deal with this case.

I should say that I think that solutions involving custom utility classes/methods aren&#39;t elegant because people working with my code won&#39;t necessarily know they exist.

Also, if anyone knows, will such a method be included in JDK 9, and where might I propose such a method? This seems like a pretty glaring omission to the API to me.

Optional orElse Optional in Java

I&#39;ve imported a project from Eclipse to Android studio. It utilizes a custom view:

    xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;

I get errors in the lines below from `activity_ro.xml` file like:

&gt; &quot;Error:(136) No resource identifier found for attribute
&gt; &#39;pstsTabPaddingLeftRight&#39; in package &#39;com.app.xxxx&#39;&quot;

    app:pstsDividerColor=&quot;#00000000&quot;
    app:pstsIndicatorColor=&quot;#FF33B5E6&quot;
    app:pstsTabPaddingLeftRight=&quot;14dip&quot;
    app:pstsUnderlineColor=&quot;#FF33B5E6&quot; /&gt;

I&#39;m not sure if custom views are different for gradle or maybe I&#39;m doing something wrong. Anyone have an idea? 

No resource identifier found for attribute &#39;...&#39; in package &#39;com.app....&#39;

At the moment I&#39;m developing an Android app that is based on third party code. I started to set breakpoints for understanding the code and soon ran into a problem. Suddenly I couldn&#39;t get Android Studio to stop at breakpoints anymore.

I tried to set the breakpoints within `onCreate` methods, within buttons&#39; `OnClickListener`s - nothing worked. Now I found out that the only place it works is inside the app module. As the project just has one single activity class in the app module and everything else is provided within library modules in fact I can&#39;t debug at all.

I assume there&#39;s something wrong in the AndroidManifest.xml or more likely in the build.gradle file. As I just switched from Eclipse to Android Studio, all of this gradle stuff is pretty new to me. 

If I hover over a library breakpoint while the app is running, it tells me that &quot;no executable code [is] found at line ...&quot;. I assume this is the cause of my problem, but I have no idea about how to fix it.

Are there any &quot;usual suspects&quot; among the entries in build.gradle that could cause my problem?

I already did clean my project and invalidated the cache without success. I even tried the suggestion to add `&lt;activity&gt;` entries inside the library module for the fragments inside.

**Edit**: I&#39;m using the most current version of Android Studio (version 1.1.0 from February 18) which should have the similar bug fixed that existed some time ago.

The contents of build.gradle in the app module:

	apply plugin: &#39;com.android.application&#39;

	android {
	    compileSdkVersion 19
	    buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION

	    defaultConfig {
	        minSdkVersion Integer.parseInt(project.MIN_SDK)
	        targetSdkVersion  Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION)
	    }

	    signingConfigs {
	        release {
	            keyAlias &#39;xxx&#39;
	            keyPassword &#39;xxx&#39;
	            storeFile file(&#39;xxx&#39;)
	            storePassword &#39;xxx&#39;
	        }
	    }

	    buildTypes {
	        release {
	            minifyEnabled false
	            proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;), &#39;proguard-rules.txt&#39;
	            signingConfig signingConfigs.release
	            debuggable false
	            jniDebuggable false
	            zipAlignEnabled true
	        }
            debug {
                minifyEnabled false
                debuggable true
            }
	    }

	    packagingOptions {
	        exclude &#39;META-INF/DEPENDENCIES&#39;
	        exclude &#39;META-INF/NOTICE&#39;
	        exclude &#39;META-INF/LICENSE&#39;
	        exclude &#39;META-INF/LICENSE.txt&#39;
	        exclude &#39;META-INF/NOTICE.txt&#39;
	    }
	    productFlavors {
	    }
	}

	dependencies {
	    compile fileTree(dir: &#39;libs&#39;, include: [&#39;*.jar&#39;])
	    compile project(&#39;:firebase_plugin&#39;)
	}

And the build.gradle of library module:

    apply plugin: &#39;com.android.library&#39;
	android {

	    compileSdkVersion 19
	    buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION
	    defaultConfig {
	        minSdkVersion Integer.parseInt(project.MIN_SDK)
	        targetSdkVersion Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION)
	    }

	    buildTypes {
	        release {
	            minifyEnabled true
	            zipAlignEnabled true
	            proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;), &#39;proguard-rules.txt&#39;
	        }
            debug {
                minifyEnabled false
                debuggable true
            }
	    }

	    productFlavors {
	    }

	}

	dependencies {
	    // Facebook SDK
	    compile project(&#39;:facebook&#39;)

	    // Used for StringUtils
	    compile files(&#39;libs/commons-lang3-3.3.2.jar&#39;)
	    // Bug tracking
	    compile files(&#39;libs/bugsense-3.6.1.jar&#39;)
	    compile fileTree(include: [&#39;*.jar&#39;], dir: &#39;libs&#39;)
	    //Google Play Services - For Google Maps
	    compile(&#39;com.google.android.gms:play-services:5.0.89&#39;) {
	        exclude group: &#39;com.google.android&#39;, module: &#39;support-v4&#39;
	    }
	    // Support Library.
	    compile &#39;com.android.support:support-v13:18.0.+&#39;

	    compile(&#39;com.android.support:appcompat-v7:19.1.0&#39;) {
	        exclude group: &#39;com.google.android&#39;, module: &#39;support-v4&#39;
	    }
	    // Volley - Networking library from google.
	    compile(&#39;com.mcxiaoke.volley:library:1.0.0&#39;) {
	        exclude group: &#39;com.google.android&#39;, module: &#39;support-v4&#39;
	    }
	    // Has is own support library in it so need to exclude it so no TOP_LEVEL_EXCEPTION will occur.
	    compile(&#39;de.greenrobot:greendao:1.3.0&#39;) {
	        exclude group: &#39;com.google.android&#39;, module: &#39;support-v4&#39;
	    }
	    // Firebase
	    compile(&#39;com.firebase:firebase-simple-login:1.4.2&#39;) {
	        exclude group: &#39;com.android.support&#39;, module: &#39;support-v4&#39;
	    }
	    // Super Toast
	    compile(&#39;com.github.johnpersano:supertoasts:1.3.4@aar&#39;) {
	        exclude group: &#39;com.android.support&#39;, module: &#39;support-v4&#39;
	    }
	    // Croping images
	    compile(&#39;com.soundcloud.android:android-crop:0.9.10@aar&#39;) {
	        exclude group: &#39;com.android.support&#39;, module: &#39;support-v4&#39;
	    }
	    compile(&#39;com.github.chrisbanes.actionbarpulltorefresh:library:0.9.9&#39;) {
	        exclude group: &#39;com.android.support&#39;, module: &#39;support-v4&#39;
	    }
	}


	    packagingOptions {
	        exclude &#39;META-INF/DEPENDENCIES&#39;
	        exclude &#39;META-INF/NOTICE&#39;
	        exclude &#39;META-INF/LICENSE&#39;
	        exclude &#39;META-INF/LICENSE.txt&#39;
	        exclude &#39;META-INF/NOTICE.txt&#39;
	    }
	    productFlavors {
	    }
	}

	dependencies {
	    compile fileTree(dir: &#39;libs&#39;, include: [&#39;*.jar&#39;])
	    compile project(&#39;:firebase_plugin&#39;)
	}

![enter image description here][1]


  [1]: http://i.stack.imgur.com/c7fuC.png

Android Studio&#39;s debugger not stopping at breakpoints within library modules

I&#39;m using Ubuntu Gnome 14.04, and I have Java 8 installed (both the JDK and the JRE).

When I was installing Android Studio everything worked, but a message appeared saying:

&gt;Unable to run mksdcard SDK tool

How can I install Android Studio correctly, or how do I fix this ?

Unable to install Android Studio in Ubuntu

I just got done installing Android studio and trying to take it for a test run.  When I try to run my app I get the following error message

    emulator: ERROR: This AVD&#39;s configuration is missing a kernel file!!
    emulator: ERROR: ANDROID_SDK_ROOT is undefined

Does anybody know how to fix this????

Cannot run emulator in Android Studio

I just recently downloaded the Android SDK.  
Downloading all the packages in the &quot;SDK Manager&quot; will take way too much time. So I&#39;m wondering whether I should deselect all the platforms except the latest one.  
Do I need all the platforms or which ones do I need?

Content Type	Original Author	Original Content on Stackoverflow
Question	Sam12	View Question on Stackoverflow
Solution 1 - Java	Scott Barta	View Answer on Stackoverflow
Solution 2 - Java	Xargs	View Answer on Stackoverflow
Solution 3 - Java	Khalid	View Answer on Stackoverflow

PSI and index do not match: PSI and index do not match on Android Studio

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Java Solutions

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How to move Docker containers between different hosts?

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