空指针问题

public class FActionServlet extends HttpServlet {

// 名称管理器
private FWebNamingManager m_oNamingManager = null;

// 业务流管理器
private FStreamConsole m_oStreamConsole = null;

// WEB线程管理器
private FWebSessionConsole m_oSessionConsole = null;

// 跟踪管理器
private FTrackerConsole m_oTrackerConsole = null;

..............

protected boolean processInitialize(ServletConfig oServletConfig) {
try {
m_oNamingManager =
(FWebNamingManager) FNamingManager.getInstance();
m_oStreamConsole =
(FStreamConsole) m_oNamingManager.lookup("Stream"); 这行空指针错误
m_oSessionConsole =
(FWebSessionConsole) m_oNamingManager.lookup("Session");
m_oTrackerConsole =
(FTrackerConsole) m_oNamingManager.lookup("Tracker");
} catch (FException oException) {
oException.getLinkRootThrowable().printStackTrace();
} catch (Exception oException) {
oException.printStackTrace();
}
return true;
}.................
}