I am using RSA 7.0.0.2 and I want to implement portlets for Tomcat(+Apache P
luto). But if i want to create a new portlet-project (File - New Portlet Pro
ject) it isn't possbile to choose Apache Tomcat as Target Runtime, only WebS
phere Server? Why?

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Look in Window->Preferences->Server->Installed Runtimes.

You can configure a new RT there.

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I added there Apache Tomcat v5.5, but it doesn't work!

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In the project explorer, try

New -> Project -> Portal -> Portlet Project -> Next

In the wizard try the new button beside "Target Runtime."

You should mess around with the wizards a bit before reposting.  And if you 
have another problem, please be more specific than "It doesn't work!"

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I choose the button next to target runtime (New...) and choose Apache Tomcat
 v5.5. But after pressing finishing, the Tomcat Server doesn't appear in the
 combobox (only WebSphere Server). (If I specify a dynamic web project, it's
 possible to select Apache
Tomcat as Target Runtime!)

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