IJ48842: NETWORKINTERFACE.ISLOOPBACK() AND ISUP() FAILS WITH JAVA.NET.SOCKETEXCEPTION IN SEMERU 11 AND SEMERU 17 ON Z/OS

APAR status

• Closed as program error.

Error description

• Error Message: java.net.SocketException `No such device or
  address.(getFlags() failed)'
  .
  Stack Trace: Exception in thread "main"
  java.lang.RuntimeException: java.net.SocketException: EDC5138I
  No such device or address. (getFlags() failed)
  at com.ibm.test.TestClient.testNetworkIsUp(TestClient.java:46)
  at com.ibm.test.TestClient.main(TestClient.java:57)
  Caused by: java.net.SocketException: EDC5138I No such device or
  address. (getFlags() failed)
  at java.base/java.net.NetworkInterface.isUp0(Native Method)
  at
  java.base/java.net.NetworkInterface.isUp(NetworkInterface.java:4
  46)
  at com.ibm.test.TestClient.testNetworkIsUp(TestClient.java:24)
  .
  N/A
  

Local fix

• N/A
  

Problem summary

• The issue is found when the network interface name is getting
  truncated because of insufficient length. This problem occurs
  only when the interface name has 16 characters. (We were
  decreasing the size by 1 while copying the interface name. The
  interface name can be of maximum length 16, but on Linux, they
  require a null terminating character, where as z/OS accepts 16
  char without null-terminated char). Since the interface name is
  not copied properly it is not able to find the interface and
  ioctl() call returns -1 and it checks for IPv6 interface. As a
  result, a 'No such device or address' error is encountered with
  java.net.SocketException.
  

Problem conclusion

• The code has been updated to provide the sufficient length to
  copy the interface name.
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
     11              11.0.21.0
     17              17.0.9.0
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  maintenance can be found at:
             https://www.ibm.com/support/pages/java-sdk
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  OPENJDK CLASS L

• Fixed component ID

  621800100

Applicable component levels