java error: BUILD FAILURE when deploying on heroku

Question

When I run the following command:
```
git push heroku master
```

I get the following error:

remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-javac/2.8.4/plexus-compiler-javac-2.8.4.jar (21 kB at 1.1 MB/s)
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-compiler-api/2.8.4/plexus-compiler-api-2.8.4.jar (27 kB at 404 kB/s)
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/com/thoughtworks/qdox/qdox/2.0-M9/qdox-2.0-M9.jar (317 kB at 4.0 MB/s)
remote: [INFO] Changes detected - recompiling the module!
remote: [INFO] Compiling 4 source files to /tmp/build_ca81690e12aa9ecc064d62f3524c8370/target/classes 
remote: [INFO] ------------------------------------------------------------------------
remote: [INFO] BUILD FAILURE
remote: [INFO] ------------------------------------------------------------------------
remote: [INFO] Total time: 11.868 s
remote: [INFO] Finished at: 2020-06-03T12:05:45Z
remote: [INFO] ------------------------------------------------------------------------
remote: [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project coronavirus-tracker: Fatal error compiling: invalid target release: 12 -> [Help 1]
remote: [ERROR]
remote: [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
remote: [ERROR] Re-run Maven using the -X switch to enable full debug logging.
remote: [ERROR]
remote: [ERROR] For more information about the errors and possible solutions, please read the following articles:
remote: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
remote:
remote: ! ERROR: Failed to build app with Maven
remote: We're sorry this build is failing! If you can't find the issue in application code,
remote: please submit a ticket so we can help: https://help.heroku.com/
remote:
remote: ! Push rejected, failed to compile Java app.
remote: 
remote: ! Push failed
remote: Verifying deploy...
remote: 
remote: ! Push rejected to covid2020global. 
remote: To https://git.heroku.com/covid2020global.git

UPDATE:

Maven pom.xml:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>io.javabrains</groupId>
    <artifactId>coronavirus-tracker</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>coronavirus-tracker</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>12</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-csv</artifactId>
            <version>1.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <!--plugin>
                <groupId>com.heroku.sdk</groupId>
                <artifactId>heroku-maven-plugin</artifactId>
                <version>3.0.2</version>
                <configuration>
                    <appName>coronavirus-tracker-master</appName>
                </configuration>
            </plugin-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <release>12</release>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

The part reg. the plugin description heroku-maven-plugin has been commented out. Might that be relevant? Also, is it possible for you to build locally, and if so, does it locally build successfully or not? — MelvinWM
– MelvinWM, Commented Jun 3, 2020 at 12:39
No it’s not due to plagin and locally I’m getting error while building(mvn clean install). I just realized that I’ve had been using JRE 8, whereas the project requires at least JDK 12. — camerons2001
– camerons2001, Commented Jun 3, 2020 at 12:41
If you have succeeded solved the problem yourself, you can help the community (and maybe get points) by writing out the answer yourself and accept it as the answer. — MelvinWM
– MelvinWM, Commented Jun 3, 2020 at 12:44
No, I haven’t solved the problem yet. But I will write the solution here asap! — camerons2001
– camerons2001, Commented Jun 3, 2020 at 13:36

AlekPo · Accepted Answer · 2020-06-03 14:18:10Z

1

The problem is the Java version number. In the error text it says "Fatal error compiling: invalid target release: 12".
For Heroku, you need to create the file "system.properties" in the root of the project, write "java.runtime.version = 12" in it.

The system.properties file indicates which version of Java is being used. Heroku supports many different versions of Java and version "12" is not the default version. Details in the documentation: https://devcenter.heroku.com/articles/getting-started-with-java#declare-app-dependencies https://devcenter.heroku.com/articles/java-support#specifying-a-java-version

answered Jun 3, 2020 at 14:18

AlekPo

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1 Comment

camerons2001 Over a year ago

I'm getting error when building the project(mvn clean install)!

camerons2001 · Accepted Answer · 2020-06-03 16:29:07Z

1

I finally solved the problem with deleting path to JRE of Java 8. And after that maven finally found path to JDK 13. I checked that with this command mvn -v. After those manipulations I succesfully deployed my project to Heroku!

answered Jun 3, 2020 at 16:29

camerons2001

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