Java Play Framework 2.8.x MySQL连接问题

application.conf

application.secret = <secret code>
application.session.maxAge = 5m
application.session.secure = true
play.http.parser.maxMemoryBuffer = 512M
application.langs = "en"

db.default.driver = com.mysql.jdbc.Driver
db.default.url = "jdbc:mysql://localhost:3306/<db_name>"
db.default.username = "username"
db.default.password = "password"

db.default.logSql=true

play.evolutions.enabled=false

ebean.default = ["package.to.models.*"]

构建.sbt

lazy val root = (project in file("."))
  .enablePlugins(PlayJava, PlayEbean)
  .settings(
    name := """project_name""",
    organization := "com.package",
    version := "1.0-SNAPSHOT",
    scalaVersion := "2.13.1",
    libraryDependencies ++= Seq(
        guice,
        jdbc,
        "mysql" % "mysql-connector-java" % "8.0.19",
        "it.innove" % "play2-pdf" % "1.10.0",
    ),
    scalacOptions ++= Seq(
      "-feature",
      "-deprecation",
      "-Xfatal-warnings"
    )
  )

---

问题是它缺少Eban ORM所需的JAXB-API依赖性

更新build.sbt文件，如下所示

lazy val root = (project in file("."))
  .enablePlugins(PlayJava, PlayEbean)
  .settings(
    name := """project_name""",
    organization := "com.package",
    version := "1.0-SNAPSHOT",
    scalaVersion := "2.13.1",
    libraryDependencies ++= Seq(
        guice,
        jdbc,
        "mysql" % "mysql-connector-java" % "8.0.19",
        "it.innove" % "play2-pdf" % "1.10.0",
        // To provide an implementation of JAXB-API, which is required by Ebean.
        "javax.xml.bind" % "jaxb-api" % "2.3.1",
        "javax.activation" % "activation" % "1.1.1",
        "org.glassfish.jaxb" % "jaxb-runtime" % "2.3.2",
    ),
    scalacOptions ++= Seq(
      "-feature",
      "-deprecation",
      "-Xfatal-warnings"
    )
  )

---

正如消息末尾所说，

连接不可用…

这很可能是由于MySql不可用造成的。请检查MySql是否已启动并正在运行，并且可用

db.default.url

config中指定的url和凭据是否正确。是的，一切正常，服务器正在运行，连接参数也正确，但显示为hikaricp timeoutWell，您是否尝试插入实际的db名称而不是？当然，还有用户名密码

lazy val root = (project in file("."))
  .enablePlugins(PlayJava, PlayEbean)
  .settings(
    name := """project_name""",
    organization := "com.package",
    version := "1.0-SNAPSHOT",
    scalaVersion := "2.13.1",
    libraryDependencies ++= Seq(
        guice,
        jdbc,
        "mysql" % "mysql-connector-java" % "8.0.19",
        "it.innove" % "play2-pdf" % "1.10.0",
        // To provide an implementation of JAXB-API, which is required by Ebean.
        "javax.xml.bind" % "jaxb-api" % "2.3.1",
        "javax.activation" % "activation" % "1.1.1",
        "org.glassfish.jaxb" % "jaxb-runtime" % "2.3.2",
    ),
    scalacOptions ++= Seq(
      "-feature",
      "-deprecation",
      "-Xfatal-warnings"
    )
  )