IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Shared classes diagnostic data

Understanding shared classes diagnostics output

When running in shared classes mode, a number of diagnostics tools can help you. The verbose options are used at run time to show cache activity and you can use the printStats and printAllStats utilities to analyze the contents of a shared class cache.

This section tells you how to interpret the output.

• Verbose output
  The verbose suboption of -Xshareclasses gives the most concise and simple diagnostic output on cache usage.
• VerboseIO output
  The verboseIO output is far more detailed, and is used at run time to show classes being stored and found in the cache.
• VerboseHelper output
  You can also obtain diagnostic data from the Java™ SharedClassHelper API using the verboseHelper suboption.
• verboseAOT output
  VerboseAOT provides output when compiled AOT code is being found or stored in the cache.
• printStats utility
  The printStats utility prints summary information about the specified cache to the standard error output. You can optionally specify one or more types of cache content, such as AOT data or tokens, to see more detailed information about that type of content. To see detailed information about all the types of content in the cache, use the printAllStats utility instead.
• printAllStats utility
  The printAllStats utility is a suboption of -Xshareclasses, optionally taking a cache name using name=<name>. This utility lists the cache contents in order, providing as much diagnostic information as possible. Because the output is listed in chronological order, you can interpret it as an "audit trail" of cache updates. Because it is a cache utility, the JVM displays the information about the cache specified or the default cache and then exits.

Parent: Shared classes diagnostic data

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