Tug’s Blog

My journey in Big Data, Hadoop, NoSQL and MapR

How to Configure Web Cache to Cache Remote Portlet Content

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Some portlet developers have hard time to set up a correct environment to use invalidation based cache with portlets. The summary is often:
“it is working with the PDK Example provided in Oracle 9iAS but every time that I want to do it myself from Oracle JDeveloper or a stand alone OC4J the portlet is not cached !”

Add Columns to OmniPortlet

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I had some questions about the limitation to 5 columns of the OmniPortlet tabular layout. Here is a tip to add more columns to this layout:

  1. backup the current OmniPortlet provider.xml /OC4J_HOME/applications/portalTools/omniPortlet/WEB-INF/providers/omniPortlet

  2. You can now open the file, and look for the tag <dataField

  3. You can add new fields, by copying the existing <dataField> tag and change the value of the <name> and <displayName>

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<name>Field6</name>
<displayName>Column6</displayName>
<description>Field6</description>
<text>##column##</text>

<alignment>left</alignment>
<displayAs>hidden</displayAs>
<type>linebreak</type>
<font>Arial.3.Plain.None</font>

<color>#000000</color>
<style>none</style>
<styleType>custom</styleType>
</dataField>

The same logic could be used to add parameters or events to the OmniPortlet.

Portlet With a Vertical Scroll Bar

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To have a better control of the layout of your Portal Pages, you can use a vertical scroll bar in portlet wihout having to use iFrame technology. CSS provide us lof of power to do it.

  1. Create a style in your portlet (or in the portlet container code):
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<style>
.scroll<i>portletId</i> {
  height:200px;
  overflow: auto;
}
</style>
  1. Use this style in a DIV section:
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<div class="scrollportletId">
The content of this section will be vertically scrollable.
</div>