请教这个报错是什么原因导致。

[1/8/16 9:01:07:798 HKT] 00000082 SharedLogWrit E   TRAS0005E: Unable to write to the service log. The following exception was encountered java.io.FileNotFoundException: /usr/websphere/AppServer/profiles/C1_SBOSS_09/logs/activity.log (Too many open files)

        at java.io.RandomAccessFile.open(Native Method)

        at java.io.RandomAccessFile.(RandomAccessFile.java:229)

        at java.io.RandomAccessFile.(RandomAccessFile.java:115)

        at com.ibm.ejs.ras.SharedLogBase$2.run(SharedLogBase.java:282)

        at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118)

        at com.ibm.ejs.ras.SharedLogBase.createRandomAccessFile(SharedLogBase.java:279)

WAS 7.0.0.21版本。linux 64位系统。