尝试将Play Framework2.1.1应用程序部署到Heroku时出错

Question

我有一个play Framework2.1.1java应用程序，它在本地主机上运行良好。

我想把它部署到Heroku，所以我遵循了这些指示

一切顺利，直到我进入这一行：

$ git push heroku master

当我在CMD中输入这一行时，在结束时会得到以下错误：

remote:        [info] Compiling 1 Scala source to     /tmp/scala_buildpack_build_dir
/.sbt_home/plugins/target/scala-2.9.2/sbt-0.12/classes...
remote:        [error] error while loading CharSequence, class file     '/tmp/scala_
buildpack_build_dir/.jdk/jre/lib/rt.jar(java/lang/CharSequence.class)' is     broken

remote:        [error] (bad constant pool tag 18 at byte 10)
remote:        [error] error while loading Comparator, class file     '/tmp/scala_bu
ildpack_build_dir/.jdk/jre/lib/rt.jar(java/util/Comparator.class)' is broken
remote:        [error] (bad constant pool tag 18 at byte 20)
remote:        [error] two errors found
remote:        [error] (compile:compile) Compilation failed
remote:        Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?
remote:  !     ERROR: Failed to run sbt!
remote:        We're sorry this build is failing! If you can't find the     issue in
 application
remote:        code, please submit a ticket so we can help:     https://help.heroku.
com
remote:        You can also try reverting to the previous version of the     buildpa
ck by running:
remote:        $ heroku buildpacks:set https://github.com/heroku/heroku-    buildpac
k-scala#previous-version
remote:
remote:        Thanks,
remote:        Heroku
remote:
remote:
remote:  !     Push rejected, failed to compile Play 2.x - Java app
remote:
remote: Verifying deploy....
remote:
remote: !       Push rejected to project.
remote:
To https://git.heroku.com/project.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/project.git'

我真的不知道该怎么办，谁能帮我？

谢谢

Answer 1

看起来，您试图部署一个使用Scala2.9的应用程序，该应用程序不支持Java 8，但在Heroku上，Java 8是默认的。

尝试将一个system.properties文件添加到应用程序的根目录中，并将以下代码放入其中：

java.runtime.version=1.7

然后将该文件添加到Git中，然后按如下方式重新部署：

$ git add system.properties
$ git commit -m "Set JDK version to 7"
$ git push heroku master