我使用Objectify 6.0.5,Ktor 1.2.6,com.google.appengine:appengine:1.9.60
我通过教程https://github.com/objectify/objectify/wiki/Setup设置了web.xml,引导程序
web.xml
...
<listener>
<listener-class>com.group.Bootstrapper</listener-class>
</listener>
<filter>
<filter-name>ObjectifyFilter</filter-name>
<filter-class>com.googlecode.objectify.ObjectifyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ObjectifyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
...
Boostrapper
class Bootstrapper : ServletContextListener {
override fun contextInitialized(sce: ServletContextEvent?) {
println(" contextInitialized")
ObjectifyService.init(
ObjectifyFactory()
)
ObjectifyService.register(User::class.java)
}
override fun contextDestroyed(sce: ServletContextEvent?) {}
}
当我调用此方法时
fun save(entity: T) {
ofy().save().entity(entity)
}
我发现错误
2020-01-05 17:55:09 ERROR Application:104 - Unhandled: GET - /test
java.lang.IllegalStateException: You must call ObjectifyService.init() before using Objectify
at com.google.common.base.Preconditions.checkState(Preconditions.java:511) ~[guava-28.1-android.jar:?]
at com.googlecode.objectify.ObjectifyService.factory(ObjectifyService.java:34) ~[objectify-6.0.5.jar:?]
at com.googlecode.objectify.ObjectifyService.ofy(ObjectifyService.java:51) ~[objectify-6.0.5.jar:?]
at com.group.dao.BaseDao.listAll(BaseDao.kt:15) ~[classes/:?]
at com.group.ApplicationKt$module$2$2.invokeSuspend(Application.kt:50) ~[classes/:?]
at com.group.ApplicationKt$module$2$2.invoke(Application.kt) ~[classes/:?]
at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:268) ~[ktor-utils-jvm-1.2.6.jar:1.2.6]
at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:141) ~[ktor-utils-jvm-1.2.6.jar:1.2.6]
at io.ktor.util.pipeline.SuspendFunctionGun.execute(PipelineContext.kt:161) ~[ktor-utils-jvm-1.2.6.jar:1.2.6]
at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:27) ~[ktor-utils-jvm-1.2.6.jar:1.2.6]
at io.ktor.routing.Routing.executeResult(Routing.kt:147) ~[ktor-server-core-1.2.6.jar:1.2.6]
...
我使用“ gcloud beta模拟器数据存储区启动”来运行数据存储区。它肯定运行。可能是无法连接到它吗?
当我运行应用程序时使用appengineRun,是否还运行数据存储库?
问题是ktor
使用协程。协程默认在线程池中运行,并且ObjectifyFilter
仅对于接收请求的线程是活动的。我使用此解决方法,直到找到更好的东西:
get(path) {
withContext(Dispatchers.Unconfined) {
val content = page.doGet()
call.respond(content)
}
}
Unconfined
调度程序在启动协程的同一线程中运行协程,至少直到第一次挂起为止。