Question

我的应用程序运行正常，直到我将jre升级到7u40。当我的应用程序正在初始化时，它正在执行Logger.getLogger（“ClassName”），并且我得到以下异常。

java.lang.ExceptionInInitializerError
    at java.util.logging.Logger.demandLogger(Unknown Source)
    at java.util.logging.Logger.getLogger(Unknown Source)
    at com.company.Application.Applet.<clinit>(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.javaws.Launcher.executeApplication(Unknown Source)
    at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
    at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
    at com.sun.javaws.Launcher.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.NullPointerException
    at java.util.logging.Logger.setParent(Unknown Source)
    at java.util.logging.LogManager$6.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.util.logging.LogManager.doSetParent(Unknown Source)
    at java.util.logging.LogManager.access$1100(Unknown Source)
    at java.util.logging.LogManager$LogNode.walkAndSetParent(Unknown Source)
    at java.util.logging.LogManager$LoggerContext.addLocalLogger(Unknown Source)
    at java.util.logging.LogManager$LoggerContext.addLocalLogger(Unknown Source)
    at java.util.logging.LogManager.addLogger(Unknown Source)
    at java.util.logging.LogManager$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.util.logging.LogManager.<clinit>(Unknown Source)

例外是来自这条线：

private static Logger logger = Logger.getLogger(Applet.class.getName());

可能是因为修复http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8017174会产生任何副作用吗？

解决方法是打开java控制中心并启用日志记录。这是一个问题，因为默认情况下未选中“启用日志记录”。如果我选择“启用日志记录”，则应用程序启动正常。

Answer 1

这个问题似乎在java 7 update 45中得到修复。

Answer 2

尝试将java.util.logging.*与您的应用打包在一个JAR中，并确保它在类路径中。这样它总是可用的。另外，您的logging.properties是什么样的？

在jre7 update 40上启动webstart时进行日志记录的NPE

2 个答案: