You want to download and install NWDS - NetWeaver Developer Studio.
SAP NetWeaver Developer Studio
SAP NetWeaver 7.0 ; SAP NetWeaver Application Server for Java all versions ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0
pre-requisites , KBA , BC-DWB-JAV-CE-INS , Installation , How To
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