Hi Kuku,
Does your server run under high volume?
We have discovered several race conditions (which may sometimes throw a NPE
under load) and have fixed them in Velocity 1.5.
WILL
On 8/1/07, kuku <[EMAIL PROTECTED]> wrote:
>
>
> Hi.....
>
> We are using velocity1.4 to implement templating in our system. The system
> is running fine since deploy. Recently, there is a serious problem that
> causing the web panel down. We did setup multiple host in resin to point
> to
> different panel. When the error happen, only the host having the problem
> down but others are ok.
>
> Host Setting in resin.conf
>
> Code: ( text )
> <host id="api.abc.com" root-directory="/www/sw/api">
> <web-app id="/" document-directory="/www/sw/api">
> <servlet-mapping url-pattern="/servlet/*" servlet-name="invoker"/>
> </web-app>
> </host>
>
>
> From the error message in stdout.log, we found the java null pointer throw
> from velocity. The coding area is somewhere like below:
>
>
> Code: ( text )
> public int doEndTag() throws JspException {
> try {
> logger.info("Velocity File Resource
> Loaded:"+Velocity.FILE_RESOURCE_LOADER_PATH);
>
> VelocityContext myVelocityContext = null;
> Velocity.setProperty(Velocity.FILE_RESOURCE_LOADER _PATH,
> velpath);
> Velocity.init();
> if (ctx == null) {
> myVelocityContext = new VelocityContext();
> }
> else {
> myVelocityContext = ctx;
> }
>
> Template template = null;
> template = Velocity.getTemplate(veltemplate, "UTF-8");
> StringWriter myStringWriter = new StringWriter();
>
> template.merge(myVelocityContext, myStringWriter);
> pageContext.getOut().print(myStringWriter);
>
> return EVAL_PAGE;
> }
> catch (Exception e) {
> e.printStackTrace();
>
> throw new JspException("Exception; TEMPLATE_CLASSPATH;
> exception="
> + e.getMessage());
> }
> }
>
>
> We are sure that the Velocity.FILE_RESOURCE_LOADER_PATH, velpath, and
> veltemplate are always holding correct value. But, just don't know why it
> throwing null pointer. Until now, we still can't find out the PATTERN to
> simulate the problem. The error might happen any time, after server
> running
> 3 days, 4 days.... anytime(even not peak hour) then suddenly throw error.
> Now, we still dont know what is the root cause.... totally not idea.....
>
> Please help...
>
> --
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> http://www.nabble.com/JSP-%2B-Velocity-%2B-Resin........-java.lang.NullPointerException-tf4204125.html#a11958420
> Sent from the Velocity - User mailing list archive at Nabble.com.
>
>
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--
Forio Business Simulations
Will Glass-Husain
[EMAIL PROTECTED]
www.forio.com
