Hi Tom,
if you hit the refresh button of your browser, the render() method of every portlet on the page is executed. This behaviour is defined by the Portlet API, so there's no need for a dedicated update call.
However, execution of the render() method can be prevented by turning on a portlet cache. Have a look at the expiration-cache setting in your portlet.xml to check if you have caching enabled. (0=caching disabled, -1=cache forever, other positive value=cache generated content for the given number of seconds) Additionally, this default caching behaviour can be adjusted by using the CacheControl object (can be retrieved by response.getCacheControl()).
HTH, Stefan.
(By the way: This is the German part of the forum. You might not get many responses when posting questions in English here.)
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