i searched on google but didn't find any thing related to this error
at net.sourceforge.ajaxtags.tags.OptionsBuilder.toString(OptionsBuilder.java:179) at net.sourceforge.ajaxtags.tags.AjaxTabPageTag.toString(AjaxTabPageTag.java:59) at net.sourceforge.ajaxtags.tags.AjaxTabPanelTag.addPage(AjaxTabPanelTag.java:85) at.
Check the version of apache commons-lang.jar in your classpath - it should be 2.3 or above (because StringUtils.join was first implemented in commons-lang 2.3).
P.S. ajaxtags.jar declares dependency on commons-lang 2.4 or above (see pom.xml)
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