我现在正在 GAE 中开发一个 Java 谷歌云端点。在端点内,它将尝试连接到 Firebase 服务器以获取一些数据。
但是,当我在端点中创建 Firebase 对象时,
Firebase ref = new Firebase(<My Firebase URL>);
GAE 抛出以下错误:
java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "modifyThreadGroup")
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:382)
at java.security.AccessController.checkPermission(AccessController.java:572)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:315)
at java.lang.Thread.init(Thread.java:391)
at java.lang.Thread.init(Thread.java:349)
at java.lang.Thread.<init>(Thread.java:675)
at java.util.concurrent.Executors$DefaultThreadFactory.newThread(Executors.java:572)
at com.firebase.client.utilities.DefaultRunLoop$FirebaseThreadFactory.newThread(DefaultRunLoop.java:25)
at java.util.concurrent.ThreadPoolExecutor$Worker.<init>(ThreadPoolExecutor.java:600)
at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:943)
at java.util.concurrent.ThreadPoolExecutor.ensurePrestart(ThreadPoolExecutor.java:1635)
at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:307)
at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:526)
at java.util.concurrent.ScheduledThreadPoolExecutor.execute(ScheduledThreadPoolExecutor.java:615)
at com.firebase.client.utilities.DefaultRunLoop.scheduleNow(DefaultRunLoop.java:57)
at com.firebase.client.core.Repo.scheduleNow(Repo.java:176)
at com.firebase.client.core.Repo.<init>(Repo.java:58)
at com.firebase.client.core.RepoManager.getLocalRepo(RepoManager.java:46)
at com.firebase.client.core.RepoManager.getRepo(RepoManager.java:19)
at com.firebase.client.Firebase.<init>(Firebase.java:194)
at com.firebase.client.Firebase.<init>(Firebase.java:199)
at com.firebase.client.Firebase.<init>(Firebase.java:177)
我使用的是 Firebase 客户端 2.2.3。似乎 GAE 不允许应用程序创建新线程。有什么想法吗?
最佳答案
在 Google App Engine 的 Java 运行时中,对创建新线程有一些限制。
请参阅the Threads section了解详情。
关于java - Google App Engine 中的 Firebase 初始化错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29475272/