To be or not to be !

在JBoss（版本为3.2.3和jboss-4.0.4.GA）上运行JSF的时候，会出现以下错误（在TOMCAT上运行完全正常），然后在GOOGLE上搜索，在JBoss的官方论坛上发现解决方案，就是把页面上的两个JSF taglib都改成WEB-INF/html_basic.tld、WEB-INF/jsf_core.tld就正常了。但在有的版本里却运行正常，如（3.2.5）。

11:31:25,062 ERROR [UIComponentTag] Faces context not found. getResponseWriter w
ill fail. Check if the FacesServlet has been initialized at all in your web.xml.

11:31:25,062 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
        at javax.faces.webapp.UIComponentTag.setupResponseWriter(UIComponentTag.
java:615)
        at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:217)

        at org.apache.myfaces.taglib.core.ViewTag.doStartTag(ViewTag.java:71)
        at org.apache.jsp.index_jsp._jspx_meth_f_view_0(index_jsp.java:123)
        at org.apache.jsp.index_jsp._jspService(index_jsp.java:99)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:332)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
14)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:672)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(Applica
tionDispatcher.java:463)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationD
ispatcher.java:398)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDis
patcher.java:301)
        at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImp
l.java:322)
        at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.
java:147)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePha
se.java:87)
        at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
        at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(Exte
nsionsFilter.java:112)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
lter.java:96)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
yAssociationValve.java:175)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
e.java:74)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:664)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
        at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
        at java.lang.Thread.run(Thread.java:595)

对SQLServer进行操作时，报“ResultSet can not re-read row data for column” ，究其原因如下（转）：
（1）如果采用jdbc-odbc驱动，那么就必须按照查询顺序来一次读取（不论有没有image或text类型）
（2）如果采用微软提供的ms sql server jdbc driver，如果查询语句中，不存在image或text类型字段，那么可以按照无序获取
（3）如果采用微软提供的ms sql server jdbc driver，如果查询语句中，存在image或text类型字段，那么就必须按照顺序读取，否则就会报告Driver]ResultSet can not re-read row data for column之类的错误
（4）如果想不查询语句中有没有image或text类型字段，都可以不按照顺序获取，或重复获取。那么就必须更换驱动，改用第三方的。

由于特殊需要，今天从开源下载了JBoss3.2.3，结果却运行不了；什么都胡乱搞了一遍，于是上GOOGLE搜索一下，又长见识，原来是JDK版本问题，换回1.4就OK！哪位高人解释一下？