■
Operating system tools. These tools are provided by the specic operating systems. See “2.16
Operating-System-Specic Tools” on page 64
.
1.2.1 Tools and Options for Post-mortem Diagnostics
This section summarizes the options and tools that are designed for post-mortem diagnostics. If
an application crashes, these options and tools can be used to obtain additional information,
either at the time of the crash or later using information from the crash dump.
Tool or Option Description and Usage
Fatal Error Log When a fatal error occurs, an error log is created. This le contains
much information obtained at the time of the fatal error. In many
cases it is the rst item to examine when a crash occurs. See
Appendix C, “Fatal Error Log.”
-XX:+HeapDumpOnOutOfMemoryError
option
This command-line option species the generation of a heap
dump when the VM detects a native out-of-memory error. See
“B.1.2 -XX:+HeapDumpOnOutOfMemoryError Option” on page 128.
-XX:OnError option This command-line option species a sequence of user-supplied
scripts or commands to be executed when a fatal error occurs. For
example, on Windows, this option can execute a command to
force a crash dump. This option is very useful on systems where a
post-mortem debugger is not congured. See
“B.1.3 -XX:OnError=
Option” on page 128
.
-XX:+ShowMessageBoxOnError This command-line option suspends a process when a fatal error
occurs. Depending on the user response, the option can launch the
native debugger (for example, dbx, gdb, msdev) to attach to the
VM. See “B.1.4 -XX:+ShowMessageBoxOnError Option” on
page 129
.
Other -XX options Several other -XX command-line options can be useful in
troubleshooting. See
“B.1.5 Other -XX Options” on page 131.
Java VisualVM
(post-mortem use on Solaris OS and
Linux only)
This utility can analyze a core dump by providing a readable
display of the core dump in the form of a heap dump and a thread
dump, as well as overview information (for example, JVM
arguments, system properties, and so forth).
jdb utility Debugger support includes an AttachingConnector, which allows
jdb and other Java language debuggers to attach to a core le. This
can be useful when trying to understand what each thread was
doing at the time of a crash. See
“2.4 jdb Utility” on page 36.
jhat utility This utility provides a convenient means to browse the object
topology in a heap dump. See
“2.5 jhat Utility” on page 39.
1.2 Summary of Tools, Options, and Commands
Chapter 1 • DiagnosticTools and Options 19
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