1. `gradle bootRun` - standard gradle&#39;run&#39; task with additional Spring Boot features. e.g. you can type: `bootRun {addResources = false}`[check github][1]
2. `gradle run` standard gradle &#39;run&#39; task


  [1]: https://github.com/spring-projects/spring-boot/blob/master/spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/run/BootRun.java

Using new firebase 3.0.1 which was recently published by google. 

Before, we had `Firebase.unauth()` method https://www.firebase.com/docs/web/api/firebase/unauth.html

But it&#39;s old API. I can&#39;t see anything related in new API:

https://firebase.google.com/docs/reference/node/index-all

What are your solutions? Trying to use something like:

    Object.keys(localStorage).forEach(key =&gt; {
      if (key.indexOf(&#39;firebase&#39;) !== -1) {
        localStorage.removeItem(key);
      }
    });

Best way to implement logout in Firebase v3.0.1+? Firebase.unauth is removed after update

I have two `struct` having the same members, I want to copy one struct to another, see the pseudo code below:

    type Common struct {
        Gender int
        From   string
        To     string
    }

    type Foo struct {
        Id    string
        Name  string
        Extra Common
    }

    type Bar struct {
        Id    string
        Name  string
        Extra Common
    }

Then I have `foo` of struct `Foo`, and `bar` of struct `Bar`, Is there any way to copy `bar` from `foo`?

Copy one struct to another where structs have same members and different types

To run a Spring Boot application, there are two gradle tasks:

1. `gradle bootRun`
2. `gradle run`

Both tasks can be used to run the Spring Boot application, what are the main differences between these tasks?

What is the difference between &quot;gradle bootRun&quot; and &quot;gradle run&quot; to run a springboot application?

<p>To run a Spring Boot application, there are two gradle tasks:</p>
<ol>
<li><code>gradle bootRun</code></li>
<li><code>gradle run</code></li>
</ol>
<p>Both tasks can be used to run the Spring Boot application, what are the main differences between these tasks?</p>


After migrating to Firebase Cloud Messaging.When opening my app it crashes and throws an error saying `java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn&#39;t exist.` I already put my new google-services.json and update my SDK. 

Here&#39;s my MainActivity

    public class MainActivity extends Activity {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
  
    //Check Google play service
        GoogleApiAvailability googleAPI = GoogleApiAvailability.getInstance();
        int resultCode = googleAPI.isGooglePlayServicesAvailable(this);

        if (resultCode != ConnectionResult.SUCCESS) {
            if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
                GooglePlayServicesUtil.getErrorDialog(resultCode, this,
                        PLAY_SERVICES_RESOLUTION_REQUEST).show();
            } else {
                Log.e(LOG_TAG, &quot;This device is not supported.&quot;);
                finish();
            }
        }

        Log.i(TAG, &quot;InstanceID token: &quot; + FirebaseInstanceId.getInstance().getToken());

    }
    }

FirebaseApp with name [DEFAULT] doesn&#39;t exist

I know both `@JsonIgnore` and `@JsonManagedReference`, `@JsonBackReference` are used  to solve the `Infinite recursion (StackOverflowError)`, what is the difference between these two?

**Note :**
These are Jackson annotations.

Difference between @JsonIgnore and @JsonBackReference, @JsonManagedReference

Spring Boot uses the properties file, and at least by default, the passwords are in plain text. Is it possible to somehow hide/decrypt these?

Spring Boot how to hide passwords in properties file

I&#39;ve noticed something weird about unhandled exceptions using Java 8 method reference. This is my code, using the lambda expression `() -&gt; s.toLowerCase()`:

    public class Test {
    
        public static void main(String[] args) {
            testNPE(null);
        }
    
        private static void testNPE(String s) {
            Thread t = new Thread(() -&gt; s.toLowerCase());
    //        Thread t = new Thread(s::toLowerCase);
            t.setUncaughtExceptionHandler((t1, e) -&gt; System.out.println(&quot;Exception!&quot;));
            t.start();
        }
    }

It prints &quot;Exception&quot;, so it works fine. But when I change `Thread t` to use a method-reference (even IntelliJ suggests that):

    Thread t = new Thread(s::toLowerCase);

the exception is not being caught:

&lt;!-- language: lang-none --&gt;

    Exception in thread &quot;main&quot; java.lang.NullPointerException
    	at Test.testNPE(Test.java:9)
    	at Test.main(Test.java:4)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:497)
    	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

Can someone explain what is going on here?

java.lang.NullPointerException is thrown using a method-reference but not a lambda expression

As we all know, many Android apps display a white screen very briefly before their first `Activity` comes into focus. This problem is observed in the following cases:

 - Android apps that extend the global [`Application`](https://developer.android.com/reference/android/app/Application.html) class and
   perform major initializations therein. The `Application`
   object is always created before the first `Activity` (a fact that can
   be observed in the debugger), so this makes sense. This is the cause of the delay in my case.
   
 - Android apps that display the default preview window before the splash screen.

Setting `android:windowDisablePreview = &quot;true&quot;` obviously does not work here. Nor can I set the parent theme of the splash screen to `Theme.Holo.NoActionBar` as described [here](http://cyrilmottier.com/2013/01/23/android-app-launching-made-gorgeous/), because [unfortunately] my splash screen makes use of an `ActionBar`.

Meanwhile, apps that do not extend the `Application` class ***do not*** show the white screen at startup.

The thing is, ideally the initializations performed in the `Application` object need to occur *before* the first `Activity` is shown. So my question is, how can I perform these initializations on app startup *without* using an `Application` object? Possibly using a `Thread` or `Service`, I suppose?

This is an interesting problem to think about. I can&#39;t bypass it the usual way (by setting the `NoActionBar` theme), as tragically my Splash screen actually has an `ActionBar` due to some unrelated reasons.

**Note:**

I have already referred to the following questions:

 - [**How To fix white screen on app Start
   up?**](https://stackoverflow.com/q/20546703)
   
 - [**Android splash screen is white in the
   beginning?**](https://stackoverflow.com/q/17181455)
   
 - [**White screen before
   splashscreen**](https://stackoverflow.com/q/15067615)

 - [**White background when Android app start up**](https://stackoverflow.com/q/19738879)

 - [**Why there is a white screen appears for 1sec when starting to run the apps in Android?**](https://stackoverflow.com/q/12613217)

**References:**

 - [**Patterns – Launch screens**](https://www.google.com/design/spec/patterns/launch-screens.html).

 - [**Branded launch screen: the new splash for Android**](http://antonioleiva.com/branded-launch-screen/).

 - [**Splash Screens the Right Way**](https://www.bignerdranch.com/blog/splash-screens-the-right-way/).

Android - Prevent white screen at startup

I&#39;m really new to Spring and Spring Security. I was reading about Spring Security and it came out the concept of _principal_, which should be the current logged user. But what if we have more than one current logged user? So, my question is, what exactly is then the principal in spring security?

I&#39;ve read for example this tutorial:

&gt; http://www.mkyong.com/spring-security/get-current-logged-in-username-in-spring-security/

and they seem to take into account that there&#39;s just one current logged user, which isn&#39;t often the case.

How do I retrieve a specific user? And how do I differentiate between users that are doing requests?

What&#39;s the &quot;principal&quot; in Spring Security?

I want my default active profile to be `production` if `-Dspring.profiles.active` is not set.

I tried the following in my `application.properties` but it did&#39;t work:

    spring.profiles.default=production

Spring-boot version = 1.3.5.RELEASE

Setting the default active profile in Spring-boot

I am trying to get the request URL in a RestController. The RestController has multiple methods annotated with `@RequestMapping` for different URIs and I am wondering how I can get the absolute URL from the `@RequestMapping` annotations.

    @RestController
    @RequestMapping(value = &quot;/my/absolute/url/{urlid}/tests&quot;
    public class Test {
       @ResponseBody
       @RequestMapping(value &quot;/&quot;,produces = &quot;application/json&quot;)
       public String getURLValue(){
          //get URL value here which should be in this case, for instance if urlid      
           //is 1 in request then  &quot;/my/absolute/url/1/tests&quot;
          String test = getURL ?
          return test;
       }
    } 



How to get request URL in Spring Boot RestController

I am trying to convert list to page in spring. I have converted it using 

&gt; new PageImpl&lt;User&gt;(users, pageable, users.size());

But now I having problem with sorting and pagination itself. When I try passing size and page, the pagination doesn&#39;t work.

Here&#39;s the code I am using.

My Controller

    	public ResponseEntity&lt;User&gt; getUsersByProgramId(
			@RequestParam(name = &quot;programId&quot;, required = true) Integer programId Pageable pageable) {

		List&lt;User&gt; users = userService.findAllByProgramId(programId);
		Page&lt;User&gt; pages = new PageImpl&lt;User&gt;(users, pageable, users.size());

		return new ResponseEntity&lt;&gt;(pages, HttpStatus.OK);
	}


Here is my user Repo

    public interface UserRepo extends JpaRepository&lt;User, Integer&gt;{

	public List&lt;User&gt; findAllByProgramId(Integer programId);

Here is my service

    	public List&lt;User&gt; findAllByProgramId(Integer programId);


Conversion of List to Page in Spring

I created a new project in **Android Studio 2.2 Preview 1** with Android App and Backend module with Google Messaging. This is the app file:

    apply plugin: &#39;com.android.application&#39;
    
    android {
        compileSdkVersion 23
        buildToolsVersion &quot;23.0.3&quot;
        defaultConfig {
            applicationId &quot;com.xxx.xxx&quot;
            minSdkVersion 15
            targetSdkVersion 23
            versionCode 1
            versionName &quot;1.0&quot;
            testInstrumentationRunner &quot;android.support.test.runner.AndroidJUnitRunner&quot;
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;), &#39;proguard-rules.pro&#39;
            }
        }
    }
    
    dependencies {
        compile fileTree(dir: &#39;libs&#39;, include: [&#39;*.jar&#39;])
        compile &#39;com.android.support:appcompat-v7:23.4.0&#39;
        compile &#39;com.android.support.constraint:constraint-layout:1.0.0-alpha1&#39;
        compile &#39;com.google.android.gms:play-services-gcm:9.0.0&#39;
        testCompile &#39;junit:junit:4.12&#39;
        androidTestCompile &#39;com.android.support.test.espresso:espresso-core:2.2.2&#39;
        androidTestCompile &#39;com.android.support.test:runner:0.5&#39;
        androidTestCompile &#39;com.android.support:support-annotations:23.4.0&#39;
        compile project(path: &#39;:backend&#39;, configuration: &#39;android-endpoints&#39;)
    }

But it&#39;s giving:

&gt; Error:Conflict with dependency &#39;com.google.code.findbugs:jsr305&#39;. Resolved versions for app (1.3.9) and test app (2.0.1) differ. See http://g.co/androidstudio/app-test-app-conflict for details.


I am new to Android and not able to find what is this error. How do I fix it?

Error:Conflict with dependency &#39;com.google.code.findbugs:jsr305&#39;

At office, I am behind a proxy. The internet access is restricted. 

So I performed a gradle sync at home and copied the folder &quot;.gradle&quot; present at C:\Users\username\.gradle from my home PC to the same location on my office PC.

Now on my office PC, I set gradle in Android Studio to &quot;Work Offline&quot; but still whenever I try to perform a gradle sync, I get an error stating

    Error: Could not download google-services.jar (com.google.gms:google-services:3.0.0): No cached version available for offline mode

However on digging through the &quot;.gradle&quot; folder I was able to locate the google-service.jar file at

    C:\Users\username\.gradle\caches\modules-2\files-2.1\com.google.gms\google-services\3.0.0\32b833222c886ecfb37d79b1a05ce1eddb702db1

I am not sure how to proceed. Please help.

no cached version available for offline mode

After merging my project with some changes from other developers I continue to get the following:

    Error:Cause: com/android/build/gradle/internal/model/DefaultAndroidProject : Unsupported major.minor version 52.0

I&#39;ve tried installing Java 8, and setting my project to use Java 8.  If I change my JAVA_HOME to 1.8 on the command line and compile with gradle it works.  If I try to use JAVA_HOME set to 1.7 and gradle it fails with the same error.  

However, in Android Studio, no matter the JDK version, it continues to print that error.

Other developers are saying they are using Java 7 without issue.  Other things I&#39;ve tried:

    gradle clean build
    gradlew clean build
    Reinstalling Android Studio

Another interesting symptom is that other projects in Android Studio are perfectly happy.  It&#39;s just this project that has this problem.

Here are my environment settings:

    OS: Mac OS X 10.9.5
    Android Studio: 2.1.1
    Android Studio JVM: 1.6
    Project JVM: 1.7.0_75
    Android SDK (Build Tools): 23.0.2
    Gradle: 2.13
    JAVA_HOME: /Library/Java/JavaVirtualMachines/jdk1.7.0_75.jdk/Contents/Home
    ANDROID_HOME: /Users/me/Library/Android/sdk

I suspect it has something to do with the gradle wrapper, but I can&#39;t figure out how to get graddle wrapper to reinitialize itself using 1.7.

Android Studio continues to get a Unsupported major.minor version 52.0

One of my build scripts imports that nebula plugin:

    plugins {
      id &#39;nebula.ospackage&#39; version &#39;3.5.0&#39;
    }

I&#39;ve been moving all of my version info into a separate file that all projects have access to and am wondering what is the correct syntax to convert to something like:

    plugins {
      id &#39;nebula.ospackage&#39; version &quot;$versions.nebula_gradle_ospackage_plugin&quot;
    }

When I try running the above with &quot;gradle clean build&quot;, I get the following error:

 

&gt; build file &#39;build.gradle&#39;: 2: argument list must be exactly 1 literal
&gt; non empty string
&gt; 
&gt;   See
&gt; https://docs.gradle.org/2.7/userguide/plugins.html#sec:plugins_block
&gt; for information on the plugins {} block
&gt; 
&gt;    @ line 2, column 33.
&gt;        id &#39;nebula.ospackage&#39; version &quot;$versions.nebula_gradle_ospackage_plugin&quot;

The linked article shows how I could use the &quot;buildscript&quot; block, which works, but it seems like there must be a way to make this work in a single line?

In gradle, how to use a variable for a plugin version?

I&#39;m going to add RESTful Web Service support with Spring to my Android application as described here https://spring.io/guides/gs/consuming-rest-android/.

This is top-level build.gradle config:

    // Top-level build file where you can add configuration options common to all sub-projects/modules.
    buildscript {
        repositories {
            jcenter()
        }
        dependencies {
            classpath &#39;com.android.tools.build:gradle:2.1.0&#39;
        }
    }
    
    allprojects {
        repositories {
            jcenter()
        }
    }

This is my `app/build.gradle` config:

    apply plugin: &#39;com.android.application&#39;
    
    android {
        compileSdkVersion 23
        buildToolsVersion &quot;23.0.3&quot;
    
        defaultConfig {
            applicationId &quot;com.example&quot;
            minSdkVersion 8
            targetSdkVersion 17
        }
    
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;), &#39;proguard-rules.txt&#39;
            }
        }
    
        dependencies {
            compile &#39;com.android.support:appcompat-v7:+&#39;
            compile fileTree(dir: &#39;libs&#39;, include: [&#39;*.jar&#39;])
            compile &#39;org.springframework.android:spring-android-rest-template:1.0.1.RELEASE&#39;
            compile &#39;com.fasterxml.jackson.core:jackson-databind:2.3.2&#39;
        }

        packagingOptions {
            exclude &#39;META-INF/NOTICE&#39; // will not include NOTICE file
            exclude &#39;META-INF/LICENSE&#39; // will not include LICENSE file
        }
        
    }

Right now it fails with a following error:

    FAILURE: Build failed with an exception.
    
    * What went wrong:
    Execution failed for task &#39;:app:transformResourcesWithMergeJavaResForDebug&#39;.
    &gt; com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/license.txt
    	File1: user\.gradle\caches\modules-2\files-2.1\org.springframework.android\spring-android-rest-template\1.0.1.RELEASE\e132d929bd181941f79b0d63edafb8a86ae6fd33\spring-android-rest-template-1.0.1.RELEASE.jar
    	File2: user\.gradle\caches\modules-2\files-2.1\org.springframework.android\spring-android-core\1.0.1.RELEASE\e68f0e8e4b636ee30c4de58953be38d9b72a5e3b\spring-android-core-1.0.1.RELEASE.jar

What am I doing wrong and how to fix it ?


Android Gradle Duplicate files copied in APK META-INF/license.txt

I&#39;m developing application based on Spring Boot and AngularJS using JHipster.
My question is how to set **max size of uploading files**?

If I&#39;m trying to upload to big file I&#39;m getting this information in console:

  

      DEBUG 11768 --- [io-8080-exec-10] c.a.app.aop.logging.LoggingAspect: 
    
    Enter: com.anuglarspring.app.web.rest.errors.ExceptionTranslator.processRuntimeException() with argument[s] = 
    
    [org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException: 
    
    org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes.]

And server response with status 500.

How to set that?

How to set the max size of upload file

I want to have **Liquibase** configured with my **Spring Boot** application, so I added dependencies to `pom.xml` and set the path to `master.xml` in `application.properties`. This works fine and **Spring Boot** runs **Liquibase** at startup. The problem is that now I want to run **Liquibase** manually, not at startup of application. Should I completely disable auto-configuration for **Liquibase** or can I use it and only disable running evaluations at startup?

Content Type	Original Author	Original Content on Stackoverflow
Question	Sanchit	View Question on Stackoverflow
Solution 1 - Java	sQer	View Answer on Stackoverflow

What is the difference between "gradle bootRun" and "gradle run" to run a springboot application?

Java Problem Overview

Java Solutions

Solution 1 - Java

Copy one struct to another where structs have same members and different types

Best way to implement logout in Firebase v3.0.1+? Firebase.unauth is removed after update

Attributions