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Starting Java on z/OS V8 SR6 FP36 (link) and V11.0.14.1 (link), we provided support for 31 / 64-bit interoperability to enable 64-bit Java development, while maintaining interoperability with 31-bit native libraries. This allows 31-bit native libraries to communicate with 64-bit Java applications.

Refer to these blog posts for different use cases:

• Enterprise COBOL 6.4 delivers simplified COBOL/Java interoperability, AMODE 31/AMODE 64 interoperability, and support for the new IBM z16 hardware
• Good news! 31-bit COBOL can now talk to 64-bit Java in IMS
• [PL/I] 31-bit and 64-bit interoperability
• Get Above The Bar: z/OS Language Environment 64-bit Support Overview

Not specific to 31/64-bit environment, see blog: Java interoperability with other languages on z/OS

Related info:

• IBM Semeru Runtime Certified Edition for z/OS product page