当我将记录器指向谷歌云记录处理程序时,我的谷歌应用程序引擎本地开发服务器返回classdef未找到异常,我该如何解决这个问题?
INFO: Dev App Server is now running
Can't load log handler "com.google.cloud.logging.LoggingHandler"
java.lang.ClassNotFoundException: com.google.cloud.logging.LoggingHandler
java.lang.ClassNotFoundException: com.google.cloud.logging.LoggingHandler
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.util.logging.LogManager$5.run(LogManager.java:965)
at java.security.AccessController.doPrivileged(Native Method)
at java.util.logging.LogManager.loadLoggerHandlers(LogManager.java:958)
at java.util.logging.LogManager.addLogger(LogManager.java:1165)
at java.util.logging.LogManager.demandLogger(LogManager.java:556)
at java.util.logging.Logger.demandLogger(Logger.java:455)
at java.util.logging.Logger.getLogger(Logger.java:502)
at coffee.weneed.chat.CoffeeChat.<clinit>(CoffeeChat.java:37)
at coffee.weneed.chat.kik.KikServlet.doGet(KikServlet.java:18)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at ...
我的logging.properties:
.level = INFO
io.grpc.netty.level=INFO
sun.net.level=INFO
coffee.weneed.chat.CoffeeChat.handlers=com.google.cloud.logging.LoggingHandler,java.util.logging.ConsoleHandler
com.google.cloud.logging.LoggingHandler.log=coffee_chat
com.google.cloud.logging.LoggingHandler.level=INFO
com.google.cloud.logging.LoggingHandler.flushLevel=SEVERE
com.google.cloud.logging.LoggingHandler.formatter=java.util.logging.SimpleFormatter
java.util.logging.SimpleFormatter.format=%3$s: %5$s%6$s
和我的系统属性:
<system-properties>
<property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
</system-properties>
我已将云记录包含在maven deps中,已安装cloud maven插件。我只是不能完全找出为什么它不会加载该类。
You have to use code to install a custom handler in GAE。这被描述为feature request for GAE。这也是JDK作为JDK-6878454: LogManager class loading inconsistent with Java EE best practices的一个已知问题。
问题是LogManager使用系统类加载器来定位处理程序,但是您的代码位于Web应用程序类加载器中,该加载器将是子类加载器。子类加载器可以在父级中定位类,但不能以其他方式定位。这是你的java.lang.ClassNotFoundException
的原因。
你可以关注this example setting up a custom handler setup in GAE。这使用ServletContextListener
来访问正确的类加载器。