There are repeating warnings in the log:

hudson.node_monitors.AbstractNodeMonitorDescriptor$Record run
WARNING: Failed to monitor hudson.model.Hudson$MasterComputer@1adf08f for Free
Swap Space
java.io.IOException: No suitable implementation found
at org.jvnet.hudson.MemoryMonitor.obtain(MemoryMonitor.java:51)
at org.jvnet.hudson.MemoryMonitor.get(MemoryMonitor.java:31)
at hudson.node_monitors.SwapSpaceMonitor$MonitorTask.call
(SwapSpaceMonitor.java:73)
at hudson.node_monitors.SwapSpaceMonitor$MonitorTask.call
(SwapSpaceMonitor.java:71)
at hudson.remoting.LocalChannel.call(LocalChannel.java:22)
at hudson.node_monitors.SwapSpaceMonitor$1.monitor
(SwapSpaceMonitor.java:55)
at hudson.node_monitors.SwapSpaceMonitor$1.monitor
(SwapSpaceMonitor.java:53)
at hudson.node_monitors.AbstractNodeMonitorDescriptor$Record.run
(AbstractNodeMonitorDescriptor.java:128)

Environment:
Solaris SunOS-5.10-i386
JDK 1.5.0_14-b03
Tomcat 6.0.16
Hudson 1.242

Could you plese fix these warnings or explain what should be done to prevent
these warnings?