标题翻译
My heroku java app (telegram bot) won't compile at launch
问题
以下是翻译好的内容：
加载我的使用Java（Maven）编写的Telegram机器人时出现了以下错误。
-----> 检测到Java应用
-----> 安装JDK 1.8... 完成
-----> 安装Maven 3.6.2... 完成
-----> 执行Maven
$ mvn -DskipTests clean dependency:list install
[INFO] 正在扫描项目...
[WARNING]
[WARNING] 构建有效模型org.example:GesualdoBot:jar:1.0-SNAPSHOT时出现一些问题
[WARNING] 对于org.apache.maven.plugins:maven-compiler-plugin的'build.plugins.plugin.version'缺失。位于第12行，第21列
[WARNING]
[WARNING] 强烈建议修复这些问题，因为它们威胁到构建的稳定性。
[WARNING]
[WARNING] 出于这个原因，未来的Maven版本可能不再支持构建这种格式不正确的项目。
[WARNING]
[INFO]
[INFO] ----------------------< org.example:GesualdoBot >-----------------------
[INFO] 正在构建GesualdoBot 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ GesualdoBot ---
[INFO] 正在删除/tmp/build_86eafd8379099658ed8301a1e005ecb8/target
[INFO]
[INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ GesualdoBot ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ GesualdoBot ---
[WARNING] 使用平台编码（实际上是UTF-8）来复制过滤后的资源，即构建是平台相关的！
[INFO] 跳过不存在的资源目录/tmp/build_86eafd8379099658ed8301a1e005ecb8/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ GesualdoBot ---
[INFO] 检测到更改 - 正在重新编译模块！
[WARNING] 文件编码尚未设置，使用平台编码UTF-8，即构建是平台相关的！
[INFO] 正在将4个源文件编译到/tmp/build_86eafd8379099658ed8301a1e005ecb8/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] 总时间：2.370秒
[INFO] 完成于：2020-05-27T18:45:46Z
[INFO] ------------------------------------------------------------------------
[ERROR] 未能执行目标org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile)于项目GesualdoBot：编译失败 -> [帮助 1]
[ERROR]
[ERROR] 要查看错误的完整堆栈跟踪，请重新使用-e开关运行Maven。
[ERROR] 使用-X开关重新运行Maven，以启用完整的调试日志记录。
[ERROR]
[ERROR] 有关错误和可能的解决方案的更多信息，请阅读以下文章：
[ERROR] [帮助 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
! 错误：使用Maven构建应用失败
很抱歉，此构建失败！如果您在应用程序代码中找不到问题，
请提交工单，以便我们提供帮助：https://help.heroku.com/
! 推送被拒绝，无法编译Java应用程序。
! 推送失败
有人可以告诉我如何解决这个问题吗？我认为第一个警告是因为在我的pom.xml文件中没有为maven-compiler-plugin指定版本；有人知道我如何查看我正在使用的当前版本吗？
英文翻译
The following error occurred while loading my telegram bot written in Java (Maven).
-----> Java app detected
-----> Installing JDK 1.8... done
-----> Installing Maven 3.6.2... done
-----> Executing Maven
$ mvn -DskipTests clean dependency:list install
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for org.example:GesualdoBot:jar:1.0-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 12, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] ----------------------< org.example:GesualdoBot >-----------------------
[INFO] Building GesualdoBot 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ GesualdoBot ---
[INFO] Deleting /tmp/build_86eafd8379099658ed8301a1e005ecb8/target
[INFO]
[INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ GesualdoBot ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ GesualdoBot ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /tmp/build_86eafd8379099658ed8301a1e005ecb8/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ GesualdoBot ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 4 source files to /tmp/build_86eafd8379099658ed8301a1e005ecb8/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.370 s
[INFO] Finished at: 2020-05-27T18:45:46Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project GesualdoBot: Compilation failure -> [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
Can anyone tell me how to solve the problem? I think the first warning is detected because in my pom.xml file I have not specified a version for maven-compiler-plugin; does anyone know how do i see the current version i am using?
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