致命错误编译：无效的目标版本：在推送到 heroku 期间为 11

Question

我正在尝试将我的后端应用程序部署到 heroku bun 当我运行这个命令时

git push --force heroku-be-app splitting-staging-be:master

我遇到了这个错误

       [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 7.6 MB/s)
       [INFO] Changes detected - recompiling the module!
       [INFO] Compiling 24 source files to /tmp/build_4e875976/target/classes
       [INFO] ------------------------------------------------------------------------
       [INFO] BUILD FAILURE
       [INFO] ------------------------------------------------------------------------
       [INFO] Total time:  12.593 s
       [INFO] Finished at: 2020-12-21T15:28:14Z
       [INFO] ------------------------------------------------------------------------
       [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project backend: Fatal error compiling: invalid target release: 11 -> [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/MojoExecutionException
 !     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

这是我的 pom 文件：

<?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>2.4.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>vs</groupId>
    <artifactId>backend</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>backend</name>
    <description>Main server voor van streek project</description>

    <properties>
        <java.version>15</java.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</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.security</groupId>
      <artifactId>spring-security-core</artifactId>
      <version>5.4.1</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>5.3.1</version>
    </dependency>
    <dependency>
      <groupId>com.sun.mail</groupId>
      <artifactId>jakarta.mail</artifactId>
      <version>1.6.5</version>
    </dependency>
  </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <source>15</source>   <!-- maven.compiler.source  -->
                    <target>15</target> <!-- maven.compiler.target -->
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

Answer 1

我通过添加一个新文件 system.properties 解决了这个问题，添加到文件中的内容是 java.runtime.version=11 （对我来说，我正在使用JDK 11)。

java.runtime.version=11

Answer 2

您必须使用 Heroku 支持的特定 Java 版本。支持的版本如下：

• Java 7 - 1.7.0_292
• Java 8 - 1.8.0_282
• Java 11 - 11.0.10
• Java 13 - 13.0.6
• Java 15 - 15.0.2

设置 system.properties 文件的 java.runtime.version 属性，如果 system.properties 文件不存在，则创建一个。

java.runtime.version = SUPPORTED_VERSION

阅读更多heroku-java-support

Answer 3

我会尝试关注为什么 maven 抱怨第 11 版无效 (Fatal error compiling: invalid target release: 11)。

从您的pom.xml 配置中可以看出，您显然打算使用版本 15，因此我建议调查版本 11 存在问题的原因。

检查$JAVA_HOME环境变量、system.properties文件等

还可以尝试official docs 或Q&A on a similar topic 中建议的调试路线。