Fix or indicate possible null pointer dereferencing detected by FindBugs

ludovicp

29.11.2008 aa4cddefb7237eea616db2b525539cc7c854d41a

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE config SYSTEM "./config.dtd">
<config>
  <protocol name="JVM">
      <attribute name="FreePhysicalMemorySize" MBeanName="java.lang:type=OperatingSystem" />
      <attribute name="FreeSwapSpaceSize" MBeanName="java.lang:type=OperatingSystem" />
  </protocol>
</config>