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Failed to execute goal com.google.cloud.tools:appengine-maven-plugin:2.3.0:run (default-cli) on project backend

I am trying to follow this tutorial https://cloud.google.com/solutions/mobile/mobile-firebase-app-engine-flexible and I keep getting this error. Especially when I run this command:
mvn clean package appengine:run
I have also tried running it in Java 8 with this command:
mvn clean package appengine:run -Djava8=true
I have also tried downgrading to Java 8, still no success.
[ERROR] Failed to execute goal com.google.cloud.tools:appengine-maven-plugin:2.3.0:run (default-cli) on project backend: Failed to run devappserver: com.google.cloud.tools.appengine.operations.cloudsdk.process.ProcessHandlerException: com.google.cloud.tools.appengine.AppEngineException: Non zero exit: 1 -> [Help 1]
My pom.xml file is shown below
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.google.cloud.solutions.flexenv</groupId>
<artifactId>backend</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>App Engine Backend module for Firebase</name>
<url>https://cloud.google.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.showDeprecation>true</maven.compiler.showDeprecation>
<archiveClasses>true</archiveClasses>
<failOnMissingWebXml>false</failOnMissingWebXml>
</properties>
<prerequisites>
<maven>3.5</maven>
</prerequisites>
<!--
The parent pom defines common style checks and testing strategies for our samples.
Removing or replacing it should not affect the execution of the samples in anyway.
-->
<parent>
<groupId>com.google.cloud.samples</groupId>
<artifactId>shared-configuration</artifactId>
<version>1.0.18</version>
</parent>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>libraries-bom</artifactId>
<version>10.0.0</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- Compile/runtime dependencies -->
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>google-cloud-logging</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.7.4</version>
</dependency>
<dependency>
<groupId>com.google.firebase</groupId>
<artifactId>firebase-server-sdk</artifactId>
<version>[3.0.0,)</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>backend</finalName>
<outputDirectory>target/${project.artifactId}-${project.version}/WEB-INF/classes</outputDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<version>3.8.1</version>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<archiveClasses>true</archiveClasses>
<webResources>
<!-- in order to interpolate version from pom into appengine-web.xml -->
<resource>
<directory>${basedir}/src/main/webapp/WEB-INF</directory>
<filtering>true</filtering>
<targetPath>WEB-INF</targetPath>
</resource>
</webResources>
</configuration>
</plugin>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>2.3.0</version>
<configuration>
<projectId>GCLOUD_CONFIG</projectId>
<version>GCLOUD_CONFIG</version>
<promote>true</promote>
</configuration>
</plugin>
</plugins>
</build>
</project>
Can someone please explain why this isn't working

I'm not an expert with Java or Maven and also don't know what is happening but runnning the commands as follows worked for me:
sudo mvn clean package appengine:run
Also you can try:
sudo mvn clean package appengine:deploy
In case it shows an error regarding that mvn is not found, just type the path where mvn is.

maven build succeeds, but eclipse build fails

I have an Eclipse / Maven project: The build with Maven succeeds, but Eclipse does have compile-time errors and cannot build.
My Eclipse is Neon (4.6.3) and I am using the build-in Maven and JDK 1.8
Could you help me solve the problem?
My pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>seller</groupId>
<artifactId>home.digest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>home.digest Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.11</version>
</dependency>
<dependency>
<!-- jsoup HTML parser library # https://jsoup.org/ -->
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.11.3</version>
</dependency>
</dependencies>
<build>
<finalName>home.digest</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
Eclipse fails to recognize the following imports in a class:
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.protocol.HttpContext;
The Eclipse project has the following properties:

The problem was, that the jar file was corrupt:
[ERROR] error reading C:\Users\User.m2\repository\org\apache\httpcomponents\httpcore\4.4.11\httpcore-4.4.11.jar; invalid LOC header (bad signature)
I solved the problem by replacing the dependency
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.11</version>
</dependency>
by the dependency on an earlier version:
4.4.10

Hello
First of all, You should check to contain the apache jar file your maven local folder. Some version folder have in your local maven folder. But doesn't have jar file.
OR
this line code add to your pom.xml file.
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.6</version>
</dependency>

how convert a java project to maven

I want to convert to Maven a lot of java projects. I've tried to do: Right click on my project --> Configure --> Convert to Maven Project. but I only get: pom.xml (I put every depency that I need, plugins and etc).
My pom.xml contains:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>prueba</groupId>
<artifactId>prueba</artifactId>
<version>0.0.1-SNAPSHOT</version>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<type>maven-plugin</type>
</dependency>
<!-- https://mvnrepository.com/artifact/org.primefaces/primefaces -->
<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>6.1</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.19.1</version>
<type>maven-plugin</type>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-firefox-driver</artifactId>
<version>3.4.0</version>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>3.4.0</version>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.11</version>
</dependency>
</dependencies>
</project>
But my java docs appears empty and the following code structure inside:
Structure
Content
But as you can see, it doesn't work because I don't have my original java code in "Maven format" and it doesn't build anything in the test.
How could I convert every java file to Maven to can execute in my TestNG.xml??
Thanks so much!!!

It seems your dependencies are not resolved or the project is not built.
Can you right click on your pom.xml and run maven install. Is your build successfull ?
Once your build is successfull.
Can you right click on project -> Maven -> Update project -> Check the Force update of snapshots/releases.
This will get all the dependencies in your classpath.
Build the code again and then it should work.
Best Regards,
Saurav

STS spring bean configuration file doesn't have spring xsd namespace

I've created a maven project in STS based on a video training tutorial and I've gone through all the steps exactly .
According to the tutorial , after adding a spring bean configuration file , I expect in the namespace tab , be able to choose some namespace like mvc and context , But I don't know why there is not . Just Bean , C , P and Util namespaces.
I've done some googling and others mentioned maybe it's because you don't have spring jars in your project , But as you can see It's a maven project and it's downloaded correctly .

You need import spring library. Each library that compose Spring add a new xsd schema.
If you want have all the possible schemas add the next to your POM file:
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-framework-bom</artifactId>
<version>${org.springframework-version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
The before xml code not import all Spring libraries into your project. You need add one by one the spring libraries that you need. After that you will see all the schemas you can use with Spring.
This is a POM example for you:
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.webapp</groupId>
<artifactId>SL14-04</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<org.springframework-version>4.3.10.RELEASE</org.springframework-version>
<org.aspectj-version>1.8.10</org.aspectj-version>
<org.slf4j-version>1.7.25</org.slf4j-version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-framework-bom</artifactId>
<version>${org.springframework-version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<exclusions>
<!-- Exclude Commons Logging in favor of SLF4j -->
<exclusion>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<encoding>${project.build.sourceEncoding}</encoding>
<compilerArgument>-Xlint:all</compilerArgument>
<showWarnings>true</showWarnings>
<showDeprecation>true</showDeprecation>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>

Try closing the project and opening it again in STS. Right click on the project and select Maven -> update project. This solved the issue for me.

In pom.xml you need to add spring-bean, spring context, spring context support dependencies as compatible to your spring version.

Import maven project but parent module disabled

I would like to import this project in my ecplise workspace:
https://github.com/steinsag/gwt-maven-example
structure of the project is:
gwt-maven-example-master
pom.xml
server
pom.xml
...
shared
pom.xml
...
web
pom.xml
...
parent pom:
<?xml version="1.0" encoding="UTF-8"?>
<project
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>de.hpfsc</groupId>
<artifactId>parent</artifactId>
<packaging>pom</packaging>
<version>1.0.0-SNAPSHOT</version>
<modules>
<module>server</module>
<module>shared</module>
<module>web</module>
</modules>
<properties>
<gwtVersion>2.5.0</gwtVersion>
<webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<tomcat.webport>8082</tomcat.webport>
<tomcat.ajpport>8182</tomcat.ajpport>
<tomcat.context>/parent</tomcat.context>
</properties>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<version>${gwtVersion}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwtVersion}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<classifier>sources</classifier>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>2.5.0-rc2</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.0</version>
<configuration>
<path>${tomcat.context}</path>
<port>${tomcat.webport}</port>
<ajpPort>${tomcat.ajpport}</ajpPort>
<systemProperties>
<JAVA_OPTS>-XX:MaxPermSize=256m</JAVA_OPTS>
</systemProperties>
</configuration>
</plugin>
</plugins>
</build>
</project>
When I try to import the folder containing this pom into eclipse, it allows me to select the children folder but not the parent itself.
Why can't import the parent pom?
I've tried to create a parent folder, put the pom.xml inside and reference other modules using ../server and it doesn't work.
I've tried to remove the code related to the tomcat configuration from the parent pom and it doesn't work either.
Thanks

You'll need the m2e plugin installed (you may already have this depending on the version of eclipse). I guess at the moment you are doing "import" then "Existing Projects into Workspace", but instead you need to select "Existing Maven Projects". This will allow you to select the parent pom and also the child modules.