Heroku 无法部署 Java 11 Spring Boot 应用程序。

Question

我正在尝试使用Java 11.0.1版本在Heroku上部署一个Spring Boot应用程序。 错误信息：

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 -> [Help 1]

经过大量的调研，我发现了 https://github.com/heroku/heroku-buildpack-java。我已经创建了包含多个版本的 system.properties 文件，例如：

• java.runtime.version=11
• java.runtime.version=11.0.1

但是在部署时仍然出现相同的错误。Spring Boot 和项目 Java 版本都设置为 11。

而且 Windows 上的 Java 版本也已设置为 11.0.1

在部署时，

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>net.manolispapadimitriou</groupId>
    <artifactId>my-project</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>my-project</name>
    <description>My Project</description>


    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>11</java.version>
        <spring-cloud.version>Greenwich.M3</spring-cloud.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.cloud</groupId>
            <artifactId>spring-cloud-starter-aws</artifactId>
        </dependency>


        <!-- https://mvnrepository.com/artifact/com.zaxxer/HikariCP -->
        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>3.2.0</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
        </dependency>


        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.3.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.7.0</version>
        </dependency>

    </dependencies>



    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <inherited>true</inherited>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>


</project>

- Manolis Pap

---

刚刚添加了它 - Manolis Pap

你的 %JAVA_HOME% 指向哪个版本的 Java？ - 4dc0

让我们在聊天中继续这个讨论。 - 4dc0

你的 system.properties 文件是否已经加入到 Git 中？你可以通过执行 git ls-files 命令来检查。 - codefinger

heroku buildpacks 命令会打印出 has no Builldpack URL set。 - Manolis Pap

Answer 1

我已经成功地将我的应用程序部署到Heroku，方法是在项目根文件夹中添加system.properties文件。

system.properties

java.runtime.version=11

pom.xml

<version>2.1.7.RELEASE</version>

<properties>
    <java.version>11</java.version>
</properties>

<dependency>
   <groupId>org.postgresql</groupId>
   <artifactId>postgresql</artifactId>
   <version>9.4-1206-jdbc42</version>
</dependency>

参考https://devcenter.heroku.com/articles/java-support#specifying-a-java-version

解决方案有效。

- Muhammad Shah

---

@Muhammad_Shah，你救了我的团队！这对我来说是救命之恩啊，兄弟！你简直是天降神助！ - Arshad Ali

请注意！提醒您将文件放在 system 而不是 application.properties 下！ - testing_22

非常好用，也适用于Java 17。谢谢！ - Guy_g23