我们正在使用Google App Engine以csv格式从我们的应用程序发布一些平面数据。 Google的DataTable和CsvRenderer from visualization-datasource库使我们的数据转换变得简单,并在本地appengine开发服务器上成功完成了测试。Google App Engine不支持java.util.logging.Logger的子类:com/ibm/icu/impl/ICULogger
部署到我们的Appspot上例如暴露了App Engine不喜欢IBM的ICU库记录的方式:
谷歌App Engine不支持java.util.logging.Logger中的子类:COM/IBM/ICU/IMPL/ICULogger
堆栈跟踪显示原点:时区的
Caused by: java.lang.SecurityException: Google App Engine does not support subclasses of java.util.logging.Logger: com/ibm/icu/impl/ICULogger
at com.google.appengine.runtime.Request.process-0b3cd097cad783e6(Request.java)
at java.lang.ClassLoader.loadClass(ClassLoader.java:360)
at com.ibm.icu.util.TimeZone.<clinit>(TimeZone.java:114)
线114:
/**
* {@icu} A logger for TimeZone. Will be null if logging is not on by way of system
* property: "icu4j.debug.logging"
* @draft ICU 4.4
* @provisional This API might change or be removed in a future release.
*/
public static ICULogger TimeZoneLogger = ICULogger.getICULogger(TimeZone.class.getName());
我把一个断点在Eclipse中,并运行单元测试在调试器和TimeZoneLogger被赋值为null,因为没有系统属性打开记录为进一步看到:
/**
* Instantiates a new ICULogger object with logging turned off by default
* unless the system property "icu4j.debug.logging" is set to "all"
*
* @param name to be use by the logger (usually is the class name)
* @param resourceBundleName name to localize messages (can be null)
* @return a new ICULogger object
* @draft ICU 4.4
* @provisional This API might change or be removed in a future release.
*/
public static ICULogger getICULogger(String name, String resourceBundleName) {
LOGGER_STATUS flag = checkGlobalLoggingFlag();
if (flag != LOGGER_STATUS.NULL) {
ICULogger logger = new ICULogger(name, resourceBundleName);
/* Add a default handler to logger*/
logger.addHandler(new ConsoleHandler());
/* Turn off logging by default unless SYSTEM_PROP_LOGGER property is set to "all" */
if (flag == LOGGER_STATUS.ON) {
logger.turnOnLogging();
} else {
logger.turnOffLogging();
}
return logger;
}
return null;
}
我把在一些日志语句中查看是否正在实例化TimeZoneLogger,并显示它不是。
[INFO] Oct 29, 2013 8:45:39 AM com.example.SomeClass
[INFO] WARNING: icu4j.debug.logging = null
[INFO] Oct 29, 2013 8:45:39 AM com.example.SomeClass
[INFO] WARNING: Time Zone Logger = null
这表明它不是App Engine不喜欢的实例,而只是对导致问题的类的引用。
在这一点上我能想到的是写我自己的CSV渲染器,这是使用违规代码的类。这种努力不会很重要,但我更愿意使用现有的库......尤其是当图书馆和平台都来自Google时。
其他建议?
好主意。我在过去曾经成功地攻击过类似这样的课程。 –