Syzygium grande (Wight) Walp., Repert. Bot. Syst. 2: 180 1843. (Syn: Eugenia cymosa Roxb. [Illegitimate]; Eugenia grandis Wight; Eugenia laosensis Gagnep.; Eugenia laosensis var. quocensis Gagnep.; Eugenia montana Wight [Illegitimate]; Jambosa firma Blume; Jambosa grandis (Wight) Blume; Syzygium firmum (Blume) Thwaites; Syzygium gadgilii M.R.Almeida [Illegitimate]; Syzygium grande var. parviflorum Chantaran. & J.Parn.; Syzygium laosense (Gagnep.) Merr. & L.M.Perry; Syzygium laosense var. quocense (Gagnep.) H.T.Chang & R.H.Miao; Syzygium megalophyllum Merr. & L.M.Perry; Syzygium montanum Thwaites & Hook.f.; Syzygium tamilnadensis Rathakr. & V.Chithra [Illegitimate]);

 

China (S-Yunnan), Cambodia, Laos, Assam, Bangladesh, India, Sri Lanka, Thailand, Singapore, Vietnam, Borneo, peninsular Malaysia (throughout), Andaman Isl., Burma (Bago, Kachin, Sagaing, Taninthayi, Yangon), Philippines (Luzon), Puerto Rico (introduced), Trinidad & Tobago (introduced), Taiwan (introduced), Seychelles (introduced) as per Catalogue of Life;

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Seems to be Carallia brachiata 

Young twigs quadrangular. It may be Syzygium grande (Wight) Walp. (=Syzygium tamilnadensis Rathakr. & Chithra)

To me looks different from images at Carallia brachiata

I think looks different from images and details at Syzygium grande

I agree with …, this seems like Syzygium grande (syn: S. tamilnadensis). It is common in shola forests in the region. The quadrangular stem also seems visible.

References:

Catalogue of Life  The Plant List  WCSP  Flora Fauna Web  Wikipedia  Useful Tropical Plants  DNA of Singapore  Indian Biodiversity Portal  Wild Singapore EOL