播放应用程序在空闲状态下死机,重新启动新请求？

Question

我正在使用HiknateCp,Hibernate和我在java中的playframework应用程序.在几分钟的空闲状态之后,似乎播放应用程序死了,当它获得新请求时它再次启动.有时我也看到Db持久性错误,其中sessionfactory不可用,我认为这是此问题的副作用.为什么应用程序在空闲状态下死机,我可以将它配置为不这样做吗？

在几分钟的空闲时间内,每次新请求后,我都会得到以下日志 -

[info] application - Application shutdown...
[info] application - Stopping HikariCP connection pool...
[info] application - Starting HikariCP connection pool...

Persistence.xml: -

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
             version="2.0">

    <persistence-unit name="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/> 
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>
            <property name="hibernate.use_sql_comments" value="true"/>
            <property name="hibernate.logSql" value="true"/>            
            <property name="hibernate.connection.provider_class" value="com.zaxxer.hikari.hibernate.HikariConnectionProvider"/>
            <property name="hibernate.hikari.dataSourceClassName" value="com.impossibl.postgres.jdbc.PGDataSource"/>
        </properties>
    </persistence-unit>

</persistence>

Application.conf: -

# JPA configuration
# ~~~~~
# You can declare as many Ebean servers as you want.
# By convention, the default server is named `default`
jpa.default=defaultPersistenceUnit

# Assets configuration
# ~~~~~
"assets.cache./public/stylesheets/bootstrap.min.css"="max-age=360000"

# Logger
# ~~~~~
# You can also configure logback (http://logback.qos.ch/), by providing a logger.xml file in the conf directory .

# Root logger:
logger=ERROR

# Logger used by the framework:
logger.play=INFO

# Logger provided to your application:
logger.application=DEBUG

谢谢 !

Answer 1

您的数据库连接提供程序在中间时不要执行任何重新连接操作，您需要向您的提供程序指示在这种情况下要做什么，例如：

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    <persistence xmlns="http://java.sun.com/xml/ns/persistence"\n                         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"\n                         xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"\n                         version="2.0">\n\n                <persistence-unit name="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">\n                    <provider>org.hibernate.ejb.HibernatePersistence</provider>\n                    <properties>\n                        <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/> \n                        <property name="hibernate.show_sql" value="true"/>\n                        <property name="hibernate.format_sql" value="true"/>\n                        <property name="hibernate.use_sql_comments" value="true"/>\n                        <property name="hibernate.logSql" value="true"/>            \n                        <property name="hibernate.connection.provider_class" value="com.zaxxer.hikari.hibernate.HikariConnectionProvider"/>\n                        <property name="hibernate.hikari.dataSourceClassName" value="com.impossibl.postgres.jdbc.PGDataSource"\n\n\n<property name="hibernate.hikari.timeBetweenEvictionRunsMillis="30000" />\n        <property name="hibernate.hikari.minEvictableIdleTimeMillis="60000"/>\n        <property name="hibernate.hikari.removeAbandonedOnBorrow="true" />    <property name="hibernate.hikari.removeAbandonedOnMaintenance="true" />\n    <property name="hibernate.hikari.maxActive="30" />\n    <property name="hibernate.hikari.maxIdle="10" />\n    <property name="hibernate.hikari.maxWait="10000" />\n    <property name="hibernate.hikari.initialSize="5" />\n    <property name="hibernate.hikari.validationQuery= "SELECT 1" /> \n    <property name="hibernate.hikari.validationInterval="30000" />\n    <property name="hibernate.hikari.removeAbandoned="true" /> \n    <property name="hibernate.hikari.removeAbandonedTimeout="60" /> \n    <property name="hibernate.hikari.logAbandoned="true"/>\n\n\n                    </properties>\n                </persistence-unit>\n\n            </persistence>\n

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检查此链接 https://github.com/brettwooldridge/HikariCP/wiki/Bad-Behavior:-Handling-Database-Down

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