Question

最近升级到Play 2.4，我仍在学习所有的小怪癖等等。我正试图让我的索引页面正常工作而且我很难接受它，而且我知道它很小，我很想念。这是错误

CreationException: Unable to create injector, see the following errors:

1) Error in custom provider, Configuration error: Configuration error[Cannot connect to database [default]]
  while locating play.api.db.DBApiProvider
  while locating play.api.db.DBApi
    for parameter 0 at play.db.DefaultDBApi.<init>(DefaultDBApi.java:28)
  at play.db.DefaultDBApi.class(DefaultDBApi.java:28)
  while locating play.db.DefaultDBApi
  while locating play.db.DBApi
    for field at play.db.DBModule$NamedDatabaseProvider.dbApi(DBModule.java:61)
  while locating play.db.DBModule$NamedDatabaseProvider
  at com.google.inject.util.Providers$GuicifiedProviderWithDependencies.initialize(Providers.java:149)
  at play.db.DBModule.bindings(DBModule.java:40):

我的配置信息（是的，mysql的端口号是正确的）

application.conf

db.default.driver=com.mysql.jdbc.Driver
db.default.url="jdbc:mysql:localhost:33060/coffee_bean"
db.default.username=
db.default.password=""
ebean.default = ["models.*"]

主控制器

public Result index() {
        ObjectNode response = Json.newObject();
        Configuration config = Play.application().configuration();
        response.put(config.getString("coffee.bean.message.key"),config.getString("coffee.bean.success.message"));
        response.put(config.getString("version"), config.getString("coffee.bean.version"));

        return ok(response);
    }

built.sbt

name := """coffee-bean"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayJava)

scalaVersion := "2.11.6"

libraryDependencies ++= Seq(
  javaJdbc,
  cache,
  javaWs,
  "mysql" % "mysql-connector-java" % "5.1.36",
  evolutions
)

// Play provides two styles of routers, one expects its actions to be injected, the
// other, legacy style, accesses its actions statically.
routesGenerator := InjectedRoutesGenerator
lazy val myProject = (project in file("."))
  .enablePlugins(PlayJava, PlayEbean)

plugins.sbt

// The Play plugin
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.4.2")

// Web plugins
addSbtPlugin("com.typesafe.sbt" % "sbt-coffeescript" % "1.0.0")
addSbtPlugin("com.typesafe.sbt" % "sbt-less" % "1.0.6")
addSbtPlugin("com.typesafe.sbt" % "sbt-jshint" % "1.0.3")
addSbtPlugin("com.typesafe.sbt" % "sbt-rjs" % "1.0.7")
addSbtPlugin("com.typesafe.sbt" % "sbt-digest" % "1.1.0")
addSbtPlugin("com.typesafe.sbt" % "sbt-mocha" % "1.1.0")

// Play enhancer - this automatically generates getters/setters for public fields
// and rewrites accessors of these fields to use the getters/setters. Remove this
// plugin if you prefer not to have this feature, or disable on a per project
// basis using disablePlugins(PlayEnhancer) in your build.sbt
addSbtPlugin("com.typesafe.sbt" % "sbt-play-enhancer" % "1.1.0")

// Play Ebean support, to enable, uncomment this line, and enable in your build.sbt using
// enablePlugins(SbtEbean). Note, uncommenting this line will automatically bring in
// Play enhancer, regardless of whether the line above is commented out or not.
addSbtPlugin("com.typesafe.sbt" % "sbt-play-ebean" % "1.0.0")
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.4.0")

还有什么需要看的吗？

到目前为止，我尝试重新导入依赖项，仔细检查以确保版本正确，再次查看文档，到目前为止还没有任何工作。我期待某个用户会得到所有答案：）

Answer 1

Database connection configuration缺失。

在conf\application.conf中定义：

db.default.driver=com.mysql.jdbc.Driver
db.default.url="jdbc:mysql://localhost/playdb"
db.default.username=playdbuser
db.default.password="a strong password"

Answer 2

我的配置：

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
             version="2.1">

    <persistence-unit name="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
        <non-jta-data-source>caribbeanDS</non-jta-data-source>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
            <property name="hibernate.hbm2ddl.auto" value="update"/>
        </properties>
    </persistence-unit>

</persistence>

我的代码：

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayJava)

scalaVersion := "2.11.6"

libraryDependencies ++= Seq(
  javaJdbc,
  cache,
  javaWs,
  javaJpa,
  "org.hibernate" % "hibernate-entitymanager" % "4.3.10.Final" // replace by your jpa implementation
)


// Play provides two styles of routers, one expects its actions to be injected, the
// other, legacy style, accesses its actions statically.
routesGenerator := InjectedRoutesGenerator


fork in run := true


# Default database configuration using MySQL database engine
# Connect to playdb as playdbuser
db.caribbean.driver=com.mysql.jdbc.Driver
db.caribbean.url="jdbc:mysql://localhost:8889/bahamasnet"
db.caribbean.username=root
db.caribbean.password="root"

db.caribbean.jndiName=caribbeanDS

jpa.default=defaultPersistenceUnit

神秘玩2.4注射异常

2 个答案: