JHSDB

NAME

jhsdb- attach to a Java process or launch a postmortem debugger to analyze the content of a core dump from a crashed Java Virtual Machine (JVM)  

SYNOPSIS

V]jhsdbR] V]clhsdbR] [V-pidR] I]pidR] | V-exeR] I]executableR] V-coreR] I]coredumpR]]

V]jhsdbR] V]hsdbR] [V-pidR] I]pidR] | V-exeR] I]executableR] V-coreR] I]coredumpR]]

V]jhsdbR] V]debugdR] (V-pidR] I]pidR] | V-exeR] I]executableR] V-coreR] I]coredumpR]) [I]optionsR]]

V]jhsdbR] V]jstackR] (V-pidR] I]pidR] | V-exeR] I]executableR] V-coreR] I]coredumpR] | V-connectR] I][serve-id[at]]debug-hostR]) [I]optionsR]]

V]jhsdbR] V]jmapR] (V-pidR] I]pidR] | V-exeR] I]executableR] V-coreR] I]coredumpR] | V-connectR] I][serve-id[at]]debug-hostR]) [I]optionsR]]

V]jhsdbR] V]jinfoR] (V-pidR] I]pidR] | V-exeR] I]executableR] V-coreR] I]coredumpR] | V-connectR] I][serve-id[at]]debug-hostR]) [I]optionsR]]

V]jhsdbR] V]jsnapR] (V-pidR] I]pidR] | V-exeR] I]executableR] V-coreR] I]coredumpR] | V-connectR] I][serve-id[at]]debug-hostR]) [I]optionsR]]

I]pidR]

The process ID to which the V]jhsdbR] tool should attach. The process must be a Java process. To get a list of Java processes running on a machine, use the V]psR] command or, if the JVM processes are not running in a separate docker instance, the B]jpsR] command.

I]executableR]

The Java executable file from which the core dump was produced.

I]coredumpR]

The core file to which the V]jhsdbR] tool should attach.

I][serve-id[at]]debug-hostR]

An optional server ID and the address of the remote debug server (debugd).

I]optionsR]

The comman-line options for a V]jhsdbR] mode. See B]Options for the debugd ModeR], B]Options for the jstack ModeR], B]Options for the jmap ModeR], B]Options for the jinfo ModeR], and B]Options for the jsnap ModeR].

B]Note:R]

Either the I]pidR] or the pair of I]executableR] and I]coreR] files or the I][serve-id[at]]debug-hostR] must be provided for V]debugdR], V]jstackR], V]jmapR], V]jinfoR] and V]jsnapR] modes.  

DESCRIPTION

You can use the V]jhsdbR] tool to attach to a Java process or to launch a postmortem debugger to analyze the content of a cor-dump from a crashed Java Virtual Machine (JVM). This command is experimental and unsupported.

B]Note:R]

Attaching the V]jhsdbR] tool to a live process will cause the process to hang and the process will probably crash when the debugger detaches.

The V]jhsdbR] tool can be launched in any one of the following modes:

V]jhsdb clhsdbR]

Starts the interactive comman-line debugger.

V]jhsdb hsdbR]

Starts the interactive GUI debugger.

V]jhsdb debugdR]

Starts the remote debug server.

V]jhsdb jstackR]

Prints stack and locks information.

V]jhsdb jmapR]

Prints heap information.

V]jhsdb jinfoR]

Prints basic JVM information.

V]jhsdb jsnapR]

Prints performance counter information.

V]jhsdbR] I]commandR] V-helpR]

Displays the options available for the I]commandR].

OPTIONS FOR THE DEBUGD MODE

V-serveridR] I]serve-idR]

An optional unique ID for this debug server. This is required if multiple debug servers are run on the same machine.

V-rmiportR] I]portR]

Sets the port number to which the RMI connector is bound. If not specified a random available port is used.

V-registryportR] I]portR]

Sets the RMI registry port. This option overrides the system property [aq]sun.jvm.hotspot.rmi.port[aq]. If not specified, the system property is used. If the system property is not set, the default port 1099 is used.

V-hostnameR] I]hostnameR]

Sets the hostname the RMI connector is bound. The value could be a hostname or an IPv4/IPv6 address. This option overrides the system property [aq]java.rmi.server.hostname[aq]. If not specified, the system property is used. If the system property is not set, a system hostname is used.

OPTIONS FOR THE JINFO MODE

V-flagsR]

Prints the VM flags.

V-syspropsR]

Prints the Java system properties.

no option

Prints the VM flags and the Java system properties.

OPTIONS FOR THE JMAP MODE

no option

Prints the same information as Solaris V]pmapR].

V-heapR]

Prints the V]javaR] heap summary.

V-binaryheapR]

Dumps the V]javaR] heap in V]hprofR] binary format.

V-dumpfileR] I]nameR]

The name of the dumpfile.

V-histoR]

Prints the histogram of V]javaR] object heap.

V-clstatsR]

Prints the class loader statistics.

V-finalizerinfoR]

Prints the information on objects awaiting finalization.

OPTIONS FOR THE JSTACK MODE

V-locksR]

Prints the V]java.util.concurrentR] locks information.

V-mixedR]

Attempts to print both V]javaR] and native frames if the platform allows it.

OPTIONS FOR THE JSNAP MODE

V-allR]

Prints all performance counters.

Index

NAME

SYNOPSIS

DESCRIPTION

OPTIONS FOR THE DEBUGD MODE

OPTIONS FOR THE JINFO MODE

OPTIONS FOR THE JMAP MODE

OPTIONS FOR THE JSTACK MODE

OPTIONS FOR THE JSNAP MODE