Eclipse Community Forums: Memory Analyzer (MAT) » Finding (ascii) strings in byte[] data

Help

Home

Home » Archived » Memory Analyzer (MAT) » Finding (ascii) strings in byte[] data

Show: Today's Messages :: Show Polls :: Message Navigator

Finding (ascii) strings in byte[] data [message #8186]

Sat, 13 December 2008 11:15

Taras Tielkes

Messages: 38
Registered: July 2009

Member

Hi,

Is there a way to search for specific strings in byte[] objects, similar
to the existing feature for Strings?

-tt

Report message to a moderator

Re: Finding (ascii) strings in byte[] data [message #8218 is a reply to message #8186]

Sun, 14 December 2008 16:14

Taras Tielkes

Messages: 38
Registered: July 2009

Member

In addition to searching byte[] instances (presumably by specifying a
character endoding), I want to search char[] instance as well.

-tt

Report message to a moderator

Re: Finding (ascii) strings in byte[] data [message #8249 is a reply to message #8218]

Mon, 15 December 2008 09:57

Andreas Buchen

Messages: 123
Registered: July 2009

Senior Member

Hi Taras,

a simple (but maybe too simple) way is this:

SELECT * FROM byte[] b WHERE toString(b) LIKE ".*java.lang.Object.*"

The "toString" function converts the object into a string representation.
It is used, among other things, in the object list or the inspector view.
However, this prints only the first 1000 characters and therefore the
regular expression works only on the first 1000 characters.

Otherwise you'd need to code a query for this. Let me think if we can make
the "find strings" query a little more generic.

Andreas.

Report message to a moderator

Re: Finding (ascii) strings in byte[] data [message #8475 is a reply to message #8249]

Tue, 16 December 2008 20:32

Taras Tielkes

Messages: 38
Registered: July 2009

Member

Hi Andreas,

One use case for searching in byte[]/char[] in addition to Strings is this:

I have a snapshot of a servlet container serving a number of concurrent
threads at the moment the snapshot was taken. Now I want to search for
some attributes of a particular request. For example: full URL or remote
IP address.

I'm pretty sure that this data is available in some internal data
structures of (in this case) Catalina - in fact it is. However, since
those structures are relatively close to the "network stack", a lot of
the data is in form of byte[]/char[].

In other cases I don't actually know for sure if some data can be found
in the snapshot. However, I just want to search with a net as wide as
possible.

In the ideal situation I'd specify a search pattern, and then
enable/disable some checkboxes (or similar) to indicate what kind of
"character-like" objects I want to target. I'm not sure what the best UI
would be.

That aside, being able to search through all String/byte[]/char[] in one
sweep would be a very powerful feature.

Just thinking...are there any more potential character data objects that
could be potential targets for such an expanded pattern search?

-tt

Report message to a moderator

Previous Topic:	Strange OOM error when running MAT + DTFJ on some jextract'ed zips
Next Topic:	MAT not showing entire HEAP ?

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Fri Apr 19 04:06:23 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter