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GWT设置UncaughtExceptionHandler 以捕获为捕捉的异常，这gwt在host mode编译后的JavaScript如果出现错误，No errors in Hosted Mode and Compiled localy, but deployed to tomcat yields in errors
这是恼人，加上UncaughtExceptionHandler起码有一丝线索
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GWT.setUncaughtExceptionHandler(new GWT.UncaughtExceptionHandler() {
public void onUncaughtException(Throwable throwable) {
String text = "Uncaught exception: ";
while (throwable != null) {
StackTraceElement[] stackTraceElements = throwable
.getStackTrace();
text += throwable.toString() + "\n";
for (int i = 0; i < stackTraceElements.length; i++) {
text += " at " + stackTraceElements[i] + "\n";
}
throwable = throwable.getCause();
if (throwable != null) {
text += "Caused by: ";
}
}
System.err.print(text);
text = text.replaceAll(" ", " ");
Window.alert("系统错误："+text);
}
});