34 Chapter 34. z/OS Batch Runtime In current distributed z/OS environments, installations with a need to re-engineer existing native z/OS COBOL applications want to incorporate the Java language to take advantage of its larger developer skill base and many language features. Moreover, a mixed z/OS COBOL and Java batch application must share a DB2 connection and use relevant language APIs to communicate with DB2 in the same unit of work (UOW). Additionally, during the running of such a re-engineered program, Embedded Structured Query Language (SQL) DB2 access in Enterprise COBOL and Java Database Connectivity (JDBC), Structured Query Language for Java (SQLJ) DB2 access in Java, or both, must coexist transparently. This chapter describes the IBM z/OS Batch Runtime product. z/OS Batch Runtime provides the ability to update the DB2 database from both COBOL and Java in a single transaction. This chapter discusses the following topics: Java COBOL interoperability JCL instream data sets Evict jobs on a step boundary Support for JOBRC (return code) For information about the SDSF perspective regarding several of these topics, see "JES2 enhancements" on page 691. © Copyright IBM Corp. 2012. All rights reserved. 747