How To Host My Telegram Bot [JAVA] Using Heroku & Maven and GitHub?

Question

My pom.xml File :

 <modelVersion>4.0.0</modelVersion>
 <groupId>TelegramBOT</groupId>
 <artifactId>TelegramBOT</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <build>
 <sourceDirectory>src</sourceDirectory>
 <plugins>
 <plugin>
 <groupId>com.heroku.sdk</groupId>
 <artifactId>heroku-maven-plugin</artifactId>
 <version>3.0.2</version>
 <configuration>
 <release>13</release>
 <appName>TelegramBOT</appName>
 <processTypes>
 <web>java $JAVA_OPTS -cp target/classes:target/dependency/* Main</web>
 </processTypes>
 </configuration>
 </plugin>
 </plugins>
 </build>
 
 <dependencies>
 <!-- https://mvnrepository.com/artifact/org.telegram/telegrambots -->
<dependency>
 <groupId>org.telegram</groupId>
 <artifactId>telegrambots</artifactId>
 <version>4.9</version>
</dependency>
 
 </dependencies>
</project>

This is The Build Of pom.xml But I am Not Able To Host In Heroku... Its Shows An Error

 [INFO] -------------------------------------------------------------
 [INFO] ------------------------------------------------------------------------
 [INFO] BUILD FAILURE
 [INFO] ------------------------------------------------------------------------
 [INFO] Total time: 10.182 s
 [INFO] Finished at: 2020年06月28日T11:59:51Z
 [INFO] ------------------------------------------------------------------------
 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project TelegramBOT: Compilation failure: Compilation failure: 
 [ERROR] /tmp/build_07ca4d72478d669dcc1d1150921b9882/src/com/TelegramBot/EraserHead/GameHandler.java:[17,60] diamond operator is not supported in -source 1.5
 [ERROR] (use -source 7 or higher to enable diamond operator)
 [ERROR] /tmp/build_07ca4d72478d669dcc1d1150921b9882/src/com/TelegramBot/EraserHead/ImageGuess.java:[23,60] diamond operator is not supported in -source 1.5
 [ERROR] (use -source 7 or higher to enable diamond operator)
 [ERROR] -> [Help 1]
 [ERROR] 
 [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
 [ERROR] Re-run Maven using the -X switch to enable full debug logging.
 [ERROR] 
 [ERROR] For more information about the errors and possible solutions, please read the following articles:
 [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
 ! ERROR: Failed to build app with Maven
 We're sorry this build is failing! If you can't find the issue in application code,
 please submit a ticket so we can help: https://help.heroku.com/
 ! Push rejected, failed to compile Java app.
 ! Push failed

This The Heroku Console ....

But In Eclipse Console Its Says BUILD SUCCESSFUL! I Can't Figure Out What To Do ... Do I Really Need To Create Procfile ??? Please Help... If You Need to See The Source Code Of My Program, It Is There In My GitHub Account : https://github.com/saikat0326/Saikat-Telegram-BOT Thanks In Advance...

Answer 1

it looks like the Maven Compiler plugin is using Java 5 (it should be using Java 6 by default), hence you get the build error diamond operator is not supported in -source 1.5

Heroku supports various Java version (see Supported Java versions), you should just be able to set the target version in your POM file

<properties>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>

Answer 2

The diamond operator – introduced in Java 1.7 – adds type inference and reduces the verbosity in the assignments.

Problem in your source code try to re-write it.

I had similar issu and my now looks like this

 <properties>
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 <webjars-bootstrap.version>4.1.3</webjars-bootstrap.version>
 <webjars-jquery-ui.version>1.12.1</webjars-jquery-ui.version>
 <webjars-jquery.version>3.3.1-1</webjars-jquery.version>
 <java.version>${java.version}</java.version>
 <maven.compiler.source>${versions-maven-plugin.version}</maven.compiler.source>
 <maven.compiler.target>${versions-maven-plugin.version}</maven.compiler.target>
</properties>