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[英]How to read a property from the application.conf file in play framework?
[英]Not able to load application.conf from cron job in play framework 2.4
我創建了一個cron作業,該作業在應用程序重新啟動期間啟動,但是當我嘗試創建數據庫連接時,我遇到了空指針異常。 我能夠使用相同的配置從其他模塊創建和使用db。
以下是我的Application.conf
db.abc.driver=com.mysql.jdbc.Driver
db.abc.url="jdbc:mysql://localhost:3306/db_name?useSSL=false"
db.abc.username=root
db.abc.password=""
db.abc.autocommit=false
db.abc.isolation=READ_COMMITTED
試圖訪問數據庫的代碼是
public class SchduleJob extends AbstractModule{
@Override
protected void configure() {
bind(JobOne.class)
.to(JobOneImpl.class)
.asEagerSingleton();
} }
@ImplementedBy(JobOneImpl.class)
public interface JobOne {}
@Singleton
public class JobOneImpl implements JobOne {
final ActorSystem actorSystem = ActorSystem.create("name");
final ActorRef alertActor = actorSystem.actorOf(AlertActor.props);
public JobOneImpl() {
scheduleJobs();
}
private Cancellable scheduleJobs() {
return actorSystem.scheduler().schedule(
Duration.create(0, TimeUnit.MILLISECONDS), //Initial delay 0 milliseconds
Duration.create(6, TimeUnit.MINUTES), //Frequency 30 minutes
alertActor,
"alert",
actorSystem.dispatcher(),
null
);
}
}
public class AlertActor extends UntypedActor{
public static Props props = Props.create(AlertActor.class);
final ActorSystem actorSystem = ActorSystem.create("name");
final ActorRef messageActor = actorSystem.actorOf(MessageActor.props());
@Override
public void onReceive(Object message) throws Exception {
if(message != null && message instanceof String) {
RequestDAO requestDAO = new RequestDAO();
try {
List<DBRow> rows = requestDAO.getAllRow();
} catch(Exception exception) {
exception.printStackTrace();
}
}
}
}
public class RequestDAO {
public List<DBRow> getAllRow() throws Exception {
List<DBRow> rows = new ArrayList<DBRow>();
Connection connection = null;
try {
connection = DB.getDataSource("abc").getConnection();
connection.setAutoCommit(false);
} catch(Exception exception) {
exception.printStackTrace();
if(connection != null) {
connection.rollback();
} else {
System.out.println("in else***********");
}
return null;
} finally {
if(connection != null)
connection.close();
}
return schools;
}
當我調用RequestDAO類的getAllRow()方法時,它會拋出
java.lang.NullPointerException
at play.api.Application$$anonfun$instanceCache$1.apply(Application.scala:235)
at play.api.Application$$anonfun$instanceCache$1.apply(Application.scala:235)
at play.utils.InlineCache.fresh(InlineCache.scala:69)
at play.utils.InlineCache.apply(InlineCache.scala:55)
at play.api.db.DB$.db(DB.scala:22)
at play.api.db.DB$.getDataSource(DB.scala:41)
at play.api.db.DB.getDataSource(DB.scala)
at play.db.DB.getDataSource(DB.java:33)
但是,相同的代碼在沒有cron作業的情況下仍能正常工作。 我應該怎么做才能消除此錯誤
Play使用Typesafe配置庫進行配置。
我懷疑您未設置cron腳本中的當前工作目錄,因此可能找不到您的application.conf
( application.properties
)文件。
但是,Config很不錯,它允許您通過文件的基本名稱(在.conf
| .properties
| .json
擴展名中選擇)或文件名(包括Java命令行中的擴展名)來指定查找文件的位置:
-Dconfig.resource=/path/to/application
-Dconfig.file=/path/to/application.properties
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