引起原因：java.sql.SQLException：不支持 JDBC4 Connection.isValid() 方法

我的 play-framework 项目在本地运行良好，但是当我尝试将其部署到 heroku 中时，出现以下错误。

2015-07-05T06:24:10.456657+00:00 app[web.1]:    at com.google.inject.Guice.createInjector(Guice.java:73)
2015-07-05T06:24:10.456817+00:00 app[web.1]:    at play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:93)
2015-07-05T06:24:10.456702+00:00 app[web.1]:    at com.google.inject.Guice.createInjector(Guice.java:62)
2015-07-05T06:24:10.456746+00:00 app[web.1]:    at play.api.inject.guice.GuiceBuilder.injector(GuiceInjectorBuilder.scala:126)
2015-07-05T06:24:10.456863+00:00 app[web.1]:    at play.api.inject.guice.GuiceApplicationLoader.load(GuiceApplicationLoader.scala:21)
2015-07-05T06:24:10.456909+00:00 app[web.1]:    at play.core.server.ProdServerStart$.start(ProdServerStart.scala:52)
2015-07-05T06:24:10.456951+00:00 app[web.1]:    at play.core.server.ProdServerStart$.main(ProdServerStart.scala:27)
2015-07-05T06:24:10.456994+00:00 app[web.1]:    at play.core.server.ProdServerStart.main(ProdServerStart.scala)
2015-07-05T06:24:10.457407+00:00 app[web.1]:    at com.zaxxer.hikari.pool.BaseHikariPool.addConnection(BaseHikariPool.java:441)
2015-07-05T06:24:10.457496+00:00 app[web.1]:    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
2015-07-05T06:24:10.457369+00:00 app[web.1]: Caused by: java.sql.SQLException: JDBC4 Connection.isValid() method not supported, connection test query must be configured
2015-07-05T06:24:10.457602+00:00 app[web.1]:    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
2015-07-05T06:24:10.457451+00:00 app[web.1]:    at com.zaxxer.hikari.pool.BaseHikariPool$1.run(BaseHikariPool.java:413)
2015-07-05T06:24:10.457681+00:00 app[web.1]:    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
2015-07-05T06:24:10.457812+00:00 app[web.1]:    at java.lang.Thread.run(Thread.java:745)
2015-07-05T06:24:10.457768+00:00 app[web.1]:    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
2015-07-05T06:24:11.231007+00:00 heroku[web.1]: Process exited with status 255
2015-07-05T06:24:11.243795+00:00 heroku[web.1]: State changed from starting to crashed
2015-07-05T06:24:11.245013+00:00 heroku[web.1]: State changed from crashed to starting
2015-07-05T06:24:16.259302+00:00 heroku[web.1]: Starting process with command `target/universal/stage/bin/sazors -Dhttp.port=10803`
2015-07-05T06:24:17.542815+00:00 app[web.1]: Picked up JAVA_TOOL_OPTIONS: -Xmx384m -Xss512k -Dfile.encoding=UTF-8
2015-07-05T06:24:18.643391+00:00 app[web.1]: 06:24:18,391 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
2015-07-05T06:24:18.643397+00:00 app[web.1]: 06:24:18,391 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]

我使用 PostgreSQL 作为我的数据库，使用 slick 作为数据库访问库。我尝试用 google 搜索它，经过一些研究，我发现当配置文件中提供的 url 不正确或返回 null 时，可能会导致此错误。我尝试修复它，但无法解决此错误。

这是我的 Procfile：

网络：target/universal/stage/bin/myapp -Dhttp.port=${PORT} -Dconfig.resource=${PLAY_CONF_FILE}

和应用程序.conf

slick.dbs.default.driver="slick.driver.PostgresDriver$"
slick.dbs.default.db.driver="org.postgresql.Driver"
slick.dbs.default.db.url="postgres://rycmvicwkkzofh:Xt2PWggm__FQEHOeq9EoMqTOtF@ec2-54-243-132-114.compute-1.amazonaws.com:5432/d5pr4h65obtb0s"
slick.dbs.default.db.user=rycmuicwkkzofh
slick.dbs.default.db.password="copiedfromheroku"

P.S：我正在研究这些修订

play framework version : 2.4.0 slick version : 3.0

EDIT: 如果我加上slick.dbs.default.db.connectionTestQuery="SELECT 1"在我的 application.conf 中，它会产生新类型的 nullPointerException 错误。

That is gone but getting new error now:
2015-07-05T12:22:49.781133+00:00 app[web.1]:    at com.google.inject.Guice.createInjector(Guice.java:73)
2015-07-05T12:22:49.781201+00:00 app[web.1]:    at com.google.inject.Guice.createInjector(Guice.java:62)
2015-07-05T12:22:49.781283+00:00 app[web.1]:    at play.api.inject.guice.GuiceBuilder.injector(GuiceInjectorBuilder.scala:126)
2015-07-05T12:22:49.781361+00:00 app[web.1]:    at play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:93)
2015-07-05T12:22:49.781507+00:00 app[web.1]:    at play.core.server.ProdServerStart$.start(ProdServerStart.scala:52)
2015-07-05T12:22:49.781425+00:00 app[web.1]:    at play.api.inject.guice.GuiceApplicationLoader.load(GuiceApplicationLoader.scala:21)
2015-07-05T12:22:49.781599+00:00 app[web.1]:    at play.core.server.ProdServerStart$.main(ProdServerStart.scala:27)
2015-07-05T12:22:49.781669+00:00 app[web.1]:    at play.core.server.ProdServerStart.main(ProdServerStart.scala)
2015-07-05T12:22:49.782161+00:00 app[web.1]: Caused by: java.lang.NullPointerException
2015-07-05T12:22:49.782226+00:00 app[web.1]:    at com.zaxxer.hikari.pool.BaseHikariPool.addConnection(BaseHikariPool.java:446)
2015-07-05T12:22:49.782328+00:00 app[web.1]:    at com.zaxxer.hikari.pool.BaseHikariPool$1.run(BaseHikariPool.java:413)
2015-07-05T12:22:49.782417+00:00 app[web.1]:    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
2015-07-05T12:22:49.782515+00:00 app[web.1]:    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
2015-07-05T12:22:49.783691+00:00 app[web.1]:    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
2015-07-05T12:22:49.783803+00:00 app[web.1]:    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
2015-07-05T12:22:49.783883+00:00 app[web.1]:    at java.lang.Thread.run(Thread.java:745)

表演光CP模块 https://github.com/playframework/playframework/blob/master/framework/src/play-jdbc/src/main/scala/play/api/db/HikariCPModule.scala#L123（查找“connectionTestQuery”配置）建议您可以按如下方式设置测试查询：

slick.dbs.default.db.connectionTestQuery="/*ping*/ select 1" // or whatever

那么理论上你的堆栈跟踪中的错误应该消失。