title: Heroku cannot deploy Java 11 Spring Boot App
body: <p>I am trying to deploy a Spring Boot app on Heroku ,using Java version 11.0.1. 
  The error:</p>
  
  <pre><code>Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project my-project: Fatal error compiling: invalid target release: 11 -&gt; [Help 1]
  </code></pre>
  
  <p>After a lot of research, I've found <a href="https://github.com/heroku/heroku-buildpack-java" rel="noreferrer">https://github.com/heroku/heroku-buildpack-java</a> . I've created the <code>system.properties</code> file with multiple variations like :</p>
  
  <ul>
  <li><code>java.runtime.version=11</code></li>
  <li><code>java.runtime.version=11.0.1</code></li>
  </ul>
  
  <p>But still, the same error appears while deploying. Spring Boot and Project java version is set to 11.
  <a href="https://i.stack.imgur.com/nkQUu.png" rel="noreferrer"><img src="https://i.stack.imgur.com/nkQUu.png" alt="enter image description here"></a></p>
  
  <p>And the java version on Windows is set as well on 11.0.1
  <a href="https://i.stack.imgur.com/tTMDF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tTMDF.png" alt="enter image description here"></a></p>
  
  <p>And while deploying
  <a href="https://i.stack.imgur.com/BErvm.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BErvm.png" alt="enter image description here"></a></p>
  
  <p><code>pom.xml</code></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;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"&gt;
      &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
  
      &lt;groupId&gt;net.manolispapadimitriou&lt;/groupId&gt;
      &lt;artifactId&gt;my-project&lt;/artifactId&gt;
      &lt;version&gt;0.0.1-SNAPSHOT&lt;/version&gt;
      &lt;packaging&gt;jar&lt;/packaging&gt;
  
      &lt;name&gt;my-project&lt;/name&gt;
      &lt;description&gt;My Project&lt;/description&gt;
  
  
      &lt;parent&gt;
          &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
          &lt;artifactId&gt;spring-boot-starter-parent&lt;/artifactId&gt;
          &lt;version&gt;2.1.0.RELEASE&lt;/version&gt;
          &lt;relativePath/&gt; &lt;!-- lookup parent from repository --&gt;
      &lt;/parent&gt;
  
      &lt;properties&gt;
          &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
          &lt;project.reporting.outputEncoding&gt;UTF-8&lt;/project.reporting.outputEncoding&gt;
          &lt;java.version&gt;11&lt;/java.version&gt;
          &lt;spring-cloud.version&gt;Greenwich.M3&lt;/spring-cloud.version&gt;
      &lt;/properties&gt;
  
      &lt;dependencies&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-data-jpa&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;
              &lt;artifactId&gt;spring-cloud-starter-aws&lt;/artifactId&gt;
          &lt;/dependency&gt;
  
  
          &lt;!-- https://mvnrepository.com/artifact/com.zaxxer/HikariCP --&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;com.zaxxer&lt;/groupId&gt;
              &lt;artifactId&gt;HikariCP&lt;/artifactId&gt;
              &lt;version&gt;3.2.0&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.hibernate&lt;/groupId&gt;
              &lt;artifactId&gt;hibernate-core&lt;/artifactId&gt;
          &lt;/dependency&gt;
  
  
          &lt;dependency&gt;
              &lt;groupId&gt;mysql&lt;/groupId&gt;
              &lt;artifactId&gt;mysql-connector-java&lt;/artifactId&gt;
              &lt;scope&gt;runtime&lt;/scope&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-test&lt;/artifactId&gt;
              &lt;scope&gt;test&lt;/scope&gt;
          &lt;/dependency&gt;
          &lt;!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework&lt;/groupId&gt;
              &lt;artifactId&gt;spring-jdbc&lt;/artifactId&gt;
              &lt;version&gt;5.1.3.RELEASE&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-devtools&lt;/artifactId&gt;
              &lt;optional&gt;true&lt;/optional&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;com.fasterxml.jackson.datatype&lt;/groupId&gt;
              &lt;artifactId&gt;jackson-datatype-jsr310&lt;/artifactId&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-security&lt;/artifactId&gt;
              &lt;version&gt;2.1.0.RELEASE&lt;/version&gt;
          &lt;/dependency&gt;
  
          &lt;dependency&gt;
              &lt;groupId&gt;io.jsonwebtoken&lt;/groupId&gt;
              &lt;artifactId&gt;jjwt&lt;/artifactId&gt;
              &lt;version&gt;0.7.0&lt;/version&gt;
          &lt;/dependency&gt;
  
      &lt;/dependencies&gt;
  
  
  
      &lt;dependencyManagement&gt;
          &lt;dependencies&gt;
              &lt;dependency&gt;
                  &lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;
                  &lt;artifactId&gt;spring-cloud-dependencies&lt;/artifactId&gt;
                  &lt;version&gt;${spring-cloud.version}&lt;/version&gt;
                  &lt;type&gt;pom&lt;/type&gt;
                  &lt;scope&gt;import&lt;/scope&gt;
              &lt;/dependency&gt;
          &lt;/dependencies&gt;
      &lt;/dependencyManagement&gt;
  
      &lt;build&gt;
          &lt;plugins&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
                  &lt;artifactId&gt;spring-boot-maven-plugin&lt;/artifactId&gt;
              &lt;/plugin&gt;
  
              &lt;plugin&gt;
                  &lt;inherited&gt;true&lt;/inherited&gt;
                  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                  &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
              &lt;/plugin&gt;
          &lt;/plugins&gt;
      &lt;/build&gt;
  
      &lt;repositories&gt;
          &lt;repository&gt;
              &lt;id&gt;spring-milestones&lt;/id&gt;
              &lt;name&gt;Spring Milestones&lt;/name&gt;
              &lt;url&gt;https://repo.spring.io/milestone&lt;/url&gt;
              &lt;snapshots&gt;
                  &lt;enabled&gt;false&lt;/enabled&gt;
              &lt;/snapshots&gt;
          &lt;/repository&gt;
      &lt;/repositories&gt;
  
  
  &lt;/project&gt;
  </code></pre>