Problem when deploy Spring boot application to GAE flex

[Ky Nguyen]

Hi everyone,

I have a spring boot application and want to deploy only in GAE flex env.

I had tried many time but currently I got error 404 when access my application in GAE.

Error 404 - Not Found.

No context on this server matched or handled this request.
Contexts known to this server are:

• / ---> o.e.j.w.WebAppContext@47ef968d{root,/,file:///var/lib/jetty/webapps/root/,UNAVAILABLE}{/root.war} [failed]

I had run successfully on my local with jetty embedded server, but don't know why this error is occurred.

my pom.xml is

<parent>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-parent</artifactId>
   <version>1.5.6.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>
   <maven.compiler.source>${java.version}</maven.compiler.source> <!-- REQUIRED -->
   <maven.compiler.target>${java.version}</maven.compiler.target> <!-- REQUIRED -->
</properties>


<dependencies>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
      <exclusions>
         <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>tomcat-juli</artifactId>
         </exclusion>
      </exclusions>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <exclusions>
         <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
         </exclusion>
      </exclusions>
   </dependency>

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

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

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

   <dependency>
      <groupId>com.zaxxer</groupId>
      <artifactId>HikariCP</artifactId>
      <scope>compile</scope>
   </dependency>

   <dependency>
      <groupId>org.apache.tomcat.embed</groupId>
      <artifactId>tomcat-embed-jasper</artifactId>
      <scope>provided</scope>
   </dependency>

   <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
   </dependency>

   <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
   </dependency>

   <dependency>
      <groupId>postgresql</groupId>
      <artifactId>postgresql</artifactId>
      <version>9.1-901.jdbc4</version>
   </dependency>

</dependencies>

<build>
   <plugins>
      <plugin>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-maven-plugin</artifactId>
         <executions>
            <execution>
               <goals>
                  <goal>repackage</goal>
               </goals>
               <configuration>
                  <mainClass>com.kevin.SpringJqgridApplication</mainClass>
               </configuration>
            </execution>
         </executions>
      </plugin>
      <plugin>
         <groupId>org.eclipse.jetty</groupId>
         <artifactId>jetty-maven-plugin</artifactId>
         <version>9.4.6.v20170531</version>
      </plugin>
      <!-- START plugin -->
      <plugin>
         <groupId>com.google.cloud.tools</groupId>
         <artifactId>appengine-maven-plugin</artifactId>
         <version>1.3.1</version>
      </plugin>
      <!-- END plugin -->
   </plugins>
</build>

I'm using this command below to deploy my application.

mvn appengine:deploy

Can anybody help me ?

thanks.

[Amit (Google Cloud Support)]

Hi Nguyen

I went through some cases related to this error and I found most of the cases indicates this is related to jetty runtime. It looks like somehow your jetty plugin is compromised. As of now current jetty-maven-plugin version is [9.4.12.v20180830]. Also if you see this [1] sample in gitHub which used flex environment to deploy spring boot in Google Cloud Platform. At the end it mentioned flex requires the new appengine-maven-plugin. Also this [2] official documentation put a note as “If there is a newer version of the App Engine Maven plugin, you should upgrade to the latest version.”  I would recommend to check if you are using the correct version. It seems like current version is [1.3.2] and from your configuration it seems like you are using [1.3.1]. I am not sure if this could be an issue, but I would recommend to update both and try again.

[0] https://mvnrepository.com/artifact/org.eclipse.jetty/jetty-maven-plugin

[1] https://github.com/GoogleCloudPlatform/getting-started-java/tree/master/helloworld-springboot

[2] https://cloud.google.com/appengine/docs/flexible/java/using-maven#running_and_testing_your_app

[Danial Farid]

Change your packaging from `war` to `jar`. That was my issue with the same error.

[Danial Farid]

My issue was packaging being `war` instead of `jar` which was giving me the same error.

On Friday, October 5, 2018 at 7:29:35 AM UTC-7, Ky Nguyen wrote: