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Since recent IDE releases are built/run of JDK1.6 or newer, it's useless depends on org.jdesktop.layout, it's better depending of standard JDK implementation.
Should already been fixed: matthias@prometheus:~/NetBeansProjects/core-main$ grep -r "org.jdesktop.layout" * | grep -v "^contrib" | awk -F "[/ ]" '{print $1}' | sort -u apisupport.ant apisupport.osgidemo apisupport.restsample autoupdate.services bugtracking bugzilla cordova cordova.platforms.android cordova.platforms.ios core.startup css.visual editor editor.bracesmatching form form.nb groovy.samples html.editor ide.ergonomics ide.kit j2me.cdc.project java.editor java.examples java.project java.source jellytools.ide jellytools.java jellytools.platform jira libs.aguiswinglayout libs.ppawtlayout lib.uihandler nbbuild o.jdesktop.layout o.n.core options.editor performance uihandler web.livehtml websvc.wsitconf => No DB module is listed