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Yesterday I got th message internally that there is a new release of Java Connector (JCo) available.

Note 1671480 explains details, but for your convenience I copied the most important information, the fixes that have been achieved:

  1. A memory leak in the Java heap is recognized.
  2. A JCoException with the CPIC error message “client with wrong appc header version rejected” is thrown.
  3. An RfcGetException with message “Received a callback from the communication partner” was logged in the RFC error log file dev_jco_rfc.trc and maybe also some table parameters of a called Remote Function Module (RFM) are empty or do not contain the expected data.
  4. RFC logon attempts hang infinitely or take too long without being interrupted after 60 seconds or after the configured RFC connect timeout interval.
  5. Fields of type XSTRING contain one 0-byte value after setting a null-reference value into them.
  6. JCo trace information in JCoServer scenarios is missing when using a JCoServerRequestHandler instance (RFC request/response model).
  7. The properties ‘jco.session_timeout’ and ‘jco.session_timeout.check_interval’ cannot be set as Java system properties with the -D argument when starting the JVM.
  8. A Remote Function Call (RFC) with using Secure Network Communication (SNC) for encryption but without using the Single Sign On (SSO) mechanism for logon authentifaction is not possible.
  9. An RFC logon to an SAP ABAP backend system with external user identification data is not supported.
  10. An RFC logon to an SAP ABAP backend system fails with a  JCoException and the error message “Select one of the installed  languages” being thrown when using a logon language that is available in Unicode SAP systems only.
  11. The JCoDestinationMonitor interface is lacking an API for querying  the number of threads that are currently waiting for a free connection.

Note 1077727 contains information about supported platforms and sources say that this soon should contain Java 7 and a couple of more operating systems.

Java Connector is available form SAP Service Marketplace Connectors where you have to follow the embarrassing path

-> SAP Java Connector

-> Tools & Services

-> Download SAP JCo Release 3.0

(embarrassing because this is still not directly linkable in 2012…)

This is down-loadable to customers only, you need Service -Marketplace access.

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