Dev App Server Does Not Support App Engine Flexible Environment Applications

Question

I am trying to deploy a spring boot application to the application engine and get this error:

org.apache.maven.plugin.MojoExecutionException: Dev App Server does not support App Engine Flexible Environment applications.

Answer 1

Check if the appengine-web.xml file is installed in the src / main / webapp / WEB-INF folder.

Answer 2

The message is correct: App Engine Flexible does not have a local emulator such as Dev App Server.

Answer 3

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, pom.xml :

<packaging>war</packaging>

, , @Ajitesh appengine-web.xml.

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Answer 4

. appengine-web.xml, ,

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
  <version>1</version>
  <threadsafe>true</threadsafe>
  <runtime>java8</runtime>
</appengine-web-app>

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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>polls</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>polls</name>
    <description>Polling App built with Spring Boot, Spring Security, MySQL and JWT</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>        
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <jjwt.version>0.9.0</jjwt.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.cxf</groupId>
            <artifactId>cxf-spring-boot-starter-jaxrs</artifactId>
            <version>3.2.5</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- For Working with Json Web Tokens (JWT) -->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>${jjwt.version}</version>
        </dependency>

        <!-- For Java 8 Date/Time Support -->
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
       <dependency>
           <groupId>javax.servlet</groupId>
           <artifactId>javax.servlet-api</artifactId>
           <scope>provided</scope>
       </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                  <executions>
                    <execution>
                      <goals>
                        <goal>repackage</goal>
                      </goals>
                    </execution>
                  </executions>
            </plugin>
        <!-- add appengine-maven-plugin -->
            <plugin>
                <groupId>com.google.cloud.tools</groupId>
                <artifactId>appengine-maven-plugin</artifactId>
                <version>1.3.2</version>
            </plugin>
        </plugins>

    </build>

</project>

Answer 5

Create a file in the directory "src / main / webapp / WEB-INF / appengine-web.xml" with the contents as shown below

<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
     <version>1</version>
     <threadsafe>true</threadsafe>
     <runtime>java8</runtime>
</appengine-web-app>