Download Eclipse and Java (J9) from the following sites. Since multiple files to download are displayed, use 6.5.15 in the introduced sentence as a key to search. I couldn't download a file that looks newer than this, so I'm aiming for this.
Windows on AMD64/EMT64T (File name: IBM_DevelopmentPackage_for_Eclipse_Win_X86_64_6.5.15.zip, Size: 436MB)
Both Eclipse and Java are included in the zip. Unzip to your favorite directory and use it. When I tried to install the plugin from Market Place, it was not included, so I installed it referring to the following. You can find it in General purpose software in the menu to install the plugin.
How to install the Market Place plugin
WebSphere Liberty is used as the environment for running the Servlet. Please refer to the following site and drag the icon or search for Liberty in Market Place and install it. Download Liberty in Eclipse
Liberty can be downloaded and installed when the Server is created. Switch Perspective to Java EE and in Server view No servers are available. Click this link to create a new server ...
Select IBM> Liberty Server and select Install from an archive or a repository.
Select WAS Liberty with Java EE 7 Full Platform to install the Java EE 7 Full Platform Bundle.
Enable Tern for each project in. You will be asked what Library to use, so select the one that best suits your needs. For now, choose Browser Extension. The assist feature is disabled by default, so enable it in Preference to make Tern completion first.
This will show suggestions after typing. Like java completion. If no suggestions are displayed, close the file and then reopen it.
The environment after installation is as follows.
C:\opt\wlp\bin>set PATH=c:\opt\eclipseJ9\ibm_sdk80\bin;%PATH% C:\opt\wlp\bin>server version IBM J9 VM version 184.108.40.206 - pwa6480sr5fp15-20180502_01(SR5 FP15) (ja_JP)WebSphere Application Server 18 above.0.0.1 (1.0.20.cl180120180309-2209) C:\opt\wlp\bin>java -version java version "1.8.0_171" Java(TM) SE Runtime Environment (build 220.127.116.11 - pwa6480sr5fp15-20180502_01(SR5 FP15)) IBM J9 VM (build 2.9, JRE 1.8.0 Windows 10 amd64-64 Compressed References 20180425_385365 (JIT enabled, AOT enabled) OpenJ9 - a7ffbfe OMR - a531219 IBM - 59ef3dc) JCL - 20180425_01 based on Oracle jdk8u171-b11
Help > About Eclipse SDK
Eclipse SDK Version: Oxygen.3a (4.7.3a) Build id: M20180330-0640