org.apache.jorphan.util

Class HeapDumper

java.lang.Object

org.apache.jorphan.util.HeapDumper

public class HeapDumper
extends Object

Class allowing access to Sun's heapDump method (Java 1.6+). Uses Reflection so that the code compiles on Java 1.5. The code will only work on Sun Java 1.6+.

Method Summary

Modifier and Type	Method and Description
static String	dumpHeap() Dumps live objects from the heap to the outputFile file in the same format as the hprof heap dump.
static String	dumpHeap(boolean live) Dumps objects from the heap to the outputFile file in the same format as the hprof heap dump.
static String	dumpHeap(File basedir, boolean live) Dumps objects from the heap to the outputFile file in the same format as the hprof heap dump.
static void	dumpHeap(String fileName) Dumps live objects from the heap to the outputFile file in the same format as the hprof heap dump.
static void	dumpHeap(String fileName, boolean live) Dumps the heap to the outputFile file in the same format as the hprof heap dump.
static void	init() Initialise the dumper, and report if there is a problem.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

init

public static void init()
                 throws Exception

Initialise the dumper, and report if there is a problem. This is optional, as the dump methods will initialise if necessary.

Throws:

Exception - if there is a problem finding the heapDump MXBean

dumpHeap

public static void dumpHeap(String fileName,
                            boolean live)
                     throws Exception

Dumps the heap to the outputFile file in the same format as the hprof heap dump.

Calls the dumpHeap() method of the HotSpotDiagnostic MXBean, if available.

See HotSpotDiagnosticMXBean

Parameters:

fileName - name of the heap dump file. Must be creatable, i.e. must not exist.

live - if true, dump only the live objects

Throws:

Exception - if the MXBean cannot be found, or if there is a problem during invocation

dumpHeap

public static void dumpHeap(String fileName)
                     throws Exception

Dumps live objects from the heap to the outputFile file in the same format as the hprof heap dump.

Parameters:

fileName - name of the heap dump file. Must be creatable, i.e. must not exist.

Throws:

Exception - if the MXBean cannot be found, or if there is a problem during invocation

See Also:

dumpHeap(String, boolean)

dumpHeap

public static String dumpHeap()
                       throws Exception

Dumps live objects from the heap to the outputFile file in the same format as the hprof heap dump.

Creates the dump using the file name: dump_yyyyMMdd_hhmmss_SSS.hprof The dump is created in the current directory.

Returns:

the name of the dump file that was created

Throws:

Exception - if the MXBean cannot be found, or if there is a problem during invocation

See Also:

dumpHeap(boolean)

dumpHeap

public static String dumpHeap(boolean live)
                       throws Exception

Dumps objects from the heap to the outputFile file in the same format as the hprof heap dump.

Creates the dump using the file name: dump_yyyyMMdd_hhmmss_SSS.hprof The dump is created in the current directory.

Parameters:

live - true id only live objects are to be dumped.

Returns:

the name of the dump file that was created

Throws:

Exception - if the MXBean cannot be found, or if there is a problem during invocation

See Also:

dumpHeap(String, boolean)

dumpHeap

public static String dumpHeap(File basedir,
                              boolean live)
                       throws Exception

Dumps objects from the heap to the outputFile file in the same format as the hprof heap dump. The dump is created in the specified directory.

Creates the dump using the file name: dump_yyyyMMdd_hhmmss_SSS.hprof

Parameters:

basedir - File object for the target base directory.

live - true id only live objects are to be dumped.

Returns:

the name of the dump file that was created

Throws:

Exception - if the MXBean cannot be found, or if there is a problem during invocation

See Also:

dumpHeap(String, boolean)