You are going to set custom Start Page as J2EE Engine default Start Page. This KBA will guide you the steps of how to do this.
SAP NetWeaver Java
Start Page, J2EE Engine, default Start Page, Http Provider, alias, J2EE engine alias, quick link, j2ee engine start page , KBA , BC-JAS-WEB , Web Container, HTTP, JavaMail, Servlets , How To
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