THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The
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purpose
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of
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this
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article
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is
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to
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show
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the
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possibilities
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of
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server-side
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monitoring
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using
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Geronimo,
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a
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Java^TM^ 2
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Platform
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Enterprise
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Edition
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(J2EE)
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application
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server.
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Monitoring
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an
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application
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server
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from
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inside
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saves
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network
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traffic,
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since
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monitored
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information
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can
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be
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analyzed,
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filtered,
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summarized,
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and
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set
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into
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an
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application
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specific
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context
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inside
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the
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server.
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For
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example
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an
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application
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server
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could
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send
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an
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when
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the
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response
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time
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of
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our
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online
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shop
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gets
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unacceptable
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big.
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A
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simple
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web
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application
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has
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been
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used
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to
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develop
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a
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server-side
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monitoring
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component
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that
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monitors
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three
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servlets
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and
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gives
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alarm
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when
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the
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overall
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average
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processing
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time
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exceeds
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a
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certain
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given
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threshold.
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What
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is
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needed
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- JDK
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- 5.0
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- (because
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- of
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- the
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- used
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- JConsole
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- tool;
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- it
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- is
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- not
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- included
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- in
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- JDK1.4):
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- Standard
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- Geronimo:
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- Sample
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- Code:
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- (Contents:
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- Sources,
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- shell
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- scripts,
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- archives,
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- README,
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- etc.)
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Introduction
A lot of articles can be found in managing application servers with remote clients using the Java Management Extensions (JMX; http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/
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).
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These
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management
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client
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applications
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describe
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how
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to
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connect
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management
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clients
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to
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a
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server
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and
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how
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to
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retrieve
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information
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from
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the
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server
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applications.
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While
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much
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attention
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has
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been
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given
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to
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the
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client-side
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aspects
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of
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JMX,
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very
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little
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consideration
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has
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been
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given
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to
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the
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server-side
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challenges
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of
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developing
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and
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deploying
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management
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beans
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(MBeans).
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The
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reason
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lays
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in
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the
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difficulties
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of
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development
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and
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integration
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of
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such
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components.
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Often
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it
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is
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not
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possible
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at
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all.
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With
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the
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appearance
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of
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Geronimo
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the
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server-side
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monitoring
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by
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implementing
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MBeans
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for
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monitoring
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servlets
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or
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EJBs
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is
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simplified.
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This
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article
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shows
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how
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to
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monitor
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the
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application
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server
...
Geronimo
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from
...
inside
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and
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how
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detailed
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information
...
querying
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the
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MBeans
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can
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be
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analyzed,
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grouped
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and
...
generated
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to
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meta
...
data
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inside
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the
...
server.
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This
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saves
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bandwidth
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between
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the
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management
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client
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and
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the
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server
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and
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allows
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to
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build
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a
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more
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efficient
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controlled
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application
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server
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with
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the
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monitor
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component
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inside.
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To
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keep
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it
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simple
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the
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Geronimo
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monitoring
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component
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is
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investigating
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the
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processing
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time
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of
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three
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servlets.
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The
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average
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of
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all
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three
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processing
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times
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is
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built
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and
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an
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alarm
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is
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generated
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if
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the
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overall
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processing
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time
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is
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greater
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then
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a
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pre-defined
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value.
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How
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the
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developed
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monitoring
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component
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is
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integrated
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into
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the
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Geronimo
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architecture
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and
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how
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it
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is
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deployed
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and
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managed
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by
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the
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JConsole
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http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/
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is
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content
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of
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this
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paper.
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Overview
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about
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MBeans
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and
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GBeans
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This
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section
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gives
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a
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short
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introduction
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of
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the
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management
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standard
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JMX
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(
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http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/
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)
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with
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its
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fundamental
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beans,
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the
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MBeans.
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It
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explains
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that
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Geronimo
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can
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be
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extended
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by
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new
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components,
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if
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they
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are
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GBeans.
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Java
...
Management
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Extension
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Java
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Management
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eXtension
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(JMX)
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(
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http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/
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)
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standardizes
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the
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managing
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and
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monitoring
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of
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applications
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and
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services.
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It
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enables
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developers
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to
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write
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management
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programs
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for
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their
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applications
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in
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a
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vendor/neutral
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fashion.
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Another
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important
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standard
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in
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the
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area
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of
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J2EE
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is
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JSR-77
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(
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http://jcp.org/en/jsr/detail?id=77
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).
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JSR-77
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is
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a
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standard
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model
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for
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managing
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the
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J2EE
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platform
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and
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allows
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application
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server
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vendors
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to
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present
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performance
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metrics
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in
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a
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standard
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way.
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It
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defines
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a
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set
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of
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standard
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metric
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types
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that
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can
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be
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used
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to
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monitor
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J2EE
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platforms.
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The
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following
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types
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of
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metrics
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are
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defined
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in
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JSR-77:
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range
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statistics,
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boundary
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statistics,
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bounded
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range
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statistics,
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count
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statistics,
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and
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time
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statistics.
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Fundamental
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to
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JMX
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is
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the
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management
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bean,
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MBean.
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There
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are
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four
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types
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of
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MBeans
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(Standard,
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Dynamic,
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Model,
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Open),
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and
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each
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provide
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a
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different
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level
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of
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sophistication
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for
...
management
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and
...
monitoring
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(see
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http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/
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for
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more
...
details).
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In
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this
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paper,
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MBeans
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are
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used
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for
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the
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monitoring
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of
...
servlets
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and
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for
...
controlling
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the
...
GBean
...
monitor
...
component.
...
Geronimo
...
hosting
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our
...
Monitor
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Component
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Geronimo
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is
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in
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the
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first
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place
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a Java^TM^ 2 Platform Enterprise Edition (J2EE)
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application
...
server,
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but
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can
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be
...
seen
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as
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a
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general
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service
...
container.
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The
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main
...
focus
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of
...
developing
...
Geronimo
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was
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the
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managing
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and
...
scaling
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of
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application
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servers.
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Geronimo's
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intention
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was
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never
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to
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re-implement
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a
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servlet
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or
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an
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EJB
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container,
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but
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to
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use
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existing
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open
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source
...
applications
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(mainly
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from
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Apache
...
...
)
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whenever
...
possible,
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plug
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it
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together
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and
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build
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a
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new
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application
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server.
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| Anchor | ||||
|---|---|---|---|---|
|
The standard Geronimo distribution comes with Apache Tomcat http://tomcat.apache.org/
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and
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EJB
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container
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(OpenEJB
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http://incubator.apache.org/openejb/
...
)
...
component.
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Extending
...
Geronimo
...
by
...
a
...
monitoring
...
component,
...
developed
...
for
...
this
...
paper,
...
is
...
like
...
Tomcat,
...
or
...
any
...
other
...
component
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as
...
long
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as
...
they
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are
...
GBeans,
...
as
...
shown
...
in the
...
...
above.
...
The
...
fundamental
...
entity
...
within
...
Geronimo
...
are
...
Geronimo
...
Beans
...
(GBeans).
...
References
- Sun's
...
- java
...
- management
...
- extensions
...
- (JMX)
...
- page.
...
...
- .
...
- JConsole
...
- reference.
...
...
- .
...
- JConsole
...
- manual.
...
...
- .
...
- JSR-77:
...
- J2EE
...
- management
...
- specification.
...
...
- .
...
- Apache
...
- home
...
- page.
...
...
- .
...
- Tomcat
...
- home
...
- page.
...
...
- .
...
- OpenEJB
...
- home
...
- page.
...
...
- .
...
- Martin
...
- Fowler;
...
- Inversion
...
- of
...
- control
...
- containers
...
- and
...
- the
...
- dependency
...
- injection
...
- pattern.
...
- ;
...
...
- ;
...
- January;
...
- 2004.
...
- Niel
...
- Frod;
...
- Dependency
...
- injection
...
- in
...
- apache
...
- geronimo,
...
- part
...
- 1:
...
- A
...
- new
...
- way
...
- to
...
- look
...
- at
...
- decoupling
...
- in
...
- j2ee
...
- applications.
...
- ;
...
...
- ;
...
- February;
...
- 2006.
...
- Niel
...
- Frod;
...
- Dependency
...
- injection
...
- in
...
- apache
...
- geronimo,
...
- part
...
- 2:
...
- The
...
- next
...
- generation.
...
- ;
...
...
- ;
...
- February;
...
- 2006.