"Portlet is temporarily unavailable" error in liferay 6.0.6 tomcat

[fatima zohra，修改在12 年前。]

I'm using Liferay 6.0.6 tomcat. I'm developping a liferay mvc portlet to display a form. But I get the message "Portlet is temporarily unavailable". I can't figure out what the problem is.

While adding the portlet to the portal I get these errors:

15:41:16,361 ERROR [jsp:154] java.lang.StackOverflowError
at org.apache.jasper.compiler.Localizer.getMessage(Localizer.java:152)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:373)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:116)
at org.apache.jasper.compiler.JspReader.pushFile(JspReader.java:609)
at org.apache.jasper.compiler.JspReader.<init>(JspReader.java:141)
at org.apache.jasper.compiler.JspReader.<init>(JspReader.java:119)
at org.apache.jasper.compiler.ParserController.determineSyntaxAndEncoding(ParserController.java:399)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:207)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:137)
at org.apache.jasper.compiler.Parser.processIncludeDirective(Parser.java:296)
at org.apache.jasper.compiler.Parser.parseIncludeDirective(Parser.java:333)
at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:441)
at org.apache.jasper.compiler.Parser.parseFileDirectives(Parser.java:1748)
at org.apache.jasper.compiler.Parser.parse(Parser.java:127)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:137)
at org.apache.jasper.compiler.Parser.processIncludeDirective(Parser.java:296)
at org.apache.jasper.compiler.Parser.parseIncludeDirective(Parser.java:333)
at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:441)
at org.apache.jasper.compiler.Parser.parseFileDirectives(Parser.java:1748)

How to solve this problem? please help me .

Regards
Fatima Zohra.

[David H Nebinger，修改在12 年前。]

There's a problem in your jsp page causing an infinite loop.

[Hitoshi Ozawa，修改在12 年前。]

You may be missing an import. If you're using Liferay IDE, check if there aren't any errors being tagged.