将Spring Boot应用程序部署到Heroku时出错

Question

将Spring Boot应用程序部署到Heroku时遇到问题。

• 我正在尝试将其部署为Java应用程序，而不是构建和部署jar文件。
• 我在Heroku中使用了免费的Postgresql。

将应用程序推送到Heroku master时出错：

remote:        [INFO] Changes detected - recompiling the module!
remote:        [INFO] Compiling 18 source files to /tmp/build_79201803/target/classes
remote:        [INFO] -------------------------------------------------------------
remote:        [ERROR] COMPILATION ERROR :
remote:        [INFO] -------------------------------------------------------------
remote:        [ERROR] /tmp/build_79201803/src/main/java/com/pukitbanta/springblog/model/post.java:[15,8] class Post is public, should be declared in a file named Post.java
remote:        [ERROR] /tmp/build_79201803/src/main/java/com/pukitbanta/springblog/model/user.java:[12,8] class User is public, should be declared in a file named User.java
remote:        [INFO] 2 errors
remote:        [INFO] -------------------------------------------------------------
remote:        [INFO] ------------------------------------------------------------------------
remote:        [INFO] BUILD FAILURE
remote:        [INFO] ------------------------------------------------------------------------
remote:        [INFO] Total time:  16.300 s
remote:        [INFO] Finished at: 2020-08-11T11:09:38Z
remote:        [INFO] ------------------------------------------------------------------------
remote:        [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project springblog: Compilation failure: Compilation failure:
remote:        [ERROR] /tmp/build_79201803/src/main/java/com/pukitbanta/springblog/model/post.java:[15,8] class Post is public, should be declared in a file named Post.java
remote:        [ERROR] /tmp/build_79201803/src/main/java/com/pukitbanta/springblog/model/user.java:[12,8] class User is public, should be declared in a file named User.java
remote:        [ERROR] -> [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/MojoFailureException
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:

这里的错误表明我的User和Post模型文件名以小写字母开头。

但是我的文件结构是：

我认为模型中没有错误，并且无法找出问题所在。

Answer 1

在屏幕快照中，文件名以大写字母开头，但是

remote:        [ERROR] /tmp/build_79201803/src/main/java/com/pukitbanta/springblog/model/post.java:[15,8] class Post is public, should be declared in a file named Post.java
remote:        [ERROR] /tmp/build_79201803/src/main/java/com/pukitbanta/springblog/model/user.java:[12,8] class User is public, should be declared in a file named User.java

错误消息中显示的文件名小写。

请再次检查小写字母。如果它们是小写字母，请按以下步骤更正它们：

• 将post.java重命名为Post.java
• 将user.java重命名为User.java

如果重命名这些文件没有意义，则可能是您的Git设置存在问题。

请参阅：https://stackoverflow.com/a/46670520/1979953

这是一个区分大小写的问题。问题是我不知道GIT不在文件中寻找区分大小写的更改。

您可以检查自己的git配置：

$ git config -l | grep ignorecase

core.ignorecase是我们这次需要的。

如果core.ignorecase是true，Git将忽略大小写差异；如果false，Git将识别出差异。因此，您需要设置false。

然后让Git识别更改并将其再次部署到Heroku。

要将core.ignorecase更新为true或false，请运行：

git config core.ignorecase true

或

git config core.ignorecase false。

Answer 2

我通过将 java 版本 11 更改为 8（在 pom.xml 中）解决了我的问题。

来自：

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

致：

<properties>
    <java.version>8</java.version>
</properties>