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我正在尝试从play 2.2.0框架部署java计算机数据库示例.我在项目的根目录中执行的步骤:

1. git init
2. git add.
3. git commit -m"init"
4. heroku创造
5. git push heroku master

在步骤5之后,应用程序被部署到heroku并尝试启动,但失败并且不清楚java.lang.NullPointerException.以下是构建日志的最后几行:

[SUCCESSFUL ] org.fusesource.jansi#jansi;1.4!jansi.jar (363ms)

:: retrieving :: org.scala-sbt#boot-scala

confs: [default]

5 artifacts copied, 0 already retrieved (24390kB/38ms)

[warn] The global sbt directory is now versioned and is located at /tmp/build_77392410-f294-4b8e-bce9-b1fab69ca175/.sbt_home/.sbt/0.13.

[warn]   You are seeing this warning because there is global configuration in /tmp/build_77392410-f294-4b8e-bce9-b1fab69ca175/.sbt_home/.sbt but not in /tmp/build_77392410-f294-4b8e-bce9-b1fab69ca175/.sbt_home/.sbt/0.13.

[warn]   The global sbt directory may be changed via the sbt.global.base system property.

[error] java.lang.NullPointerException

[error] Use 'last' …