Just never use that class. Rewrite your stuff with Commons HttpClient and 
you'll be happier all around.

Sent from my iPhone

On Dec 1, 2010, at 2:00 AM, D Tim Cummings <t...@triptera.com.au> wrote:

> Hi Q
> 
> WOHTTPConnection sendRequest(WORequest request) creates a new thread to 
> implement timeout.  I was creating threads also because the sendRequest 
> implementation of timeout wasn't working for me.  I disabled my code that 
> created threads but was still getting the OutOfMemory problem.
> 
> Start of the thread dump below. I was able to reproduce the problem by 
> manually clicking on the refresh page button over and over again.
> 
> jstack 9451
> 2010-12-01 16:52:02
> Full thread dump Java HotSpot(TM) 64-Bit Server VM (16.3-b01 mixed mode):
> 
> "Attach Listener" daemon prio=10 tid=0x0000000057371800 nid=0x4485 waiting on 
> condition [0x0000000000000000]
>    java.lang.Thread.State: RUNNABLE
> 
> "Thread-1129" prio=10 tid=0x0000000057093800 nid=0x2cde in Object.wait() 
> [0x000000005bb4a000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab07d17a8> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab07d17a8> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1126" prio=10 tid=0x00000000564f8000 nid=0x2cdb in Object.wait() 
> [0x000000005ba49000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab0784fc8> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab0784fc8> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1123" prio=10 tid=0x00000000564af000 nid=0x2cd8 in Object.wait() 
> [0x000000005b948000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab073c040> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab073c040> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1120" prio=10 tid=0x00000000563e0800 nid=0x2cd5 in Object.wait() 
> [0x000000005b847000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab06f18f0> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab06f18f0> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1117" prio=10 tid=0x000000005695c000 nid=0x2cd2 in Object.wait() 
> [0x000000005b746000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab06a5360> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab06a5360> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1114" prio=10 tid=0x00000000566de800 nid=0x2cc0 in Object.wait() 
> [0x000000005b645000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab0659af8> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab0659af8> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1111" prio=10 tid=0x0000000057098800 nid=0x2cbd in Object.wait() 
> [0x000000005b544000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab060e6a0> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab060e6a0> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1108" prio=10 tid=0x0000000057097800 nid=0x2cba in Object.wait() 
> [0x000000005b443000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab05c45f8> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab05c45f8> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1105" prio=10 tid=0x0000000057330000 nid=0x2cb7 in Object.wait() 
> [0x000000005b342000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab057f298> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab057f298> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1102" prio=10 tid=0x00000000564b5800 nid=0x2cb4 in Object.wait() 
> [0x000000005b241000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab0535cc8> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab0535cc8> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1099" prio=10 tid=0x00000000564ee000 nid=0x2cb1 in Object.wait() 
> [0x000000005b140000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab04e9d98> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab04e9d98> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> "Thread-1096" prio=10 tid=0x000000005699a800 nid=0x2cae in Object.wait() 
> [0x000000005b03f000]
>    java.lang.Thread.State: WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00002aaab049ea28> (a [Z)
>       at java.lang.Object.wait(Object.java:485)
>       at 
> com.webobjects.appserver._private.WOUrlConnection$UrlDataReader.run(WOUrlConnection.java:452)
>       - locked <0x00002aaab049ea28> (a [Z)
>       at java.lang.Thread.run(Thread.java:619)
> 
> 
> 
> On 01/12/2010, at 4:04 PM, Q wrote:
> 
>> 
>> On 01/12/2010, at 3:36 PM, D Tim Cummings wrote:
>> 
>>> We have a sessionless app that we have been running for years on Mac OS X 
>>> on XServes.  We recently moved it to Red Hat servers and now we are getting 
>>> Out of Memory errors even though we have significantly increased the memory 
>>> available.  Red Hat is using the java sun jvm 1.6.0_20 64 bit, while the 
>>> Mac servers were running java from Apple 1.5.0_24.  I also tried on my Mac 
>>> workstation using Apple java 1.6.0.22 64 bit and the memory appeared to be 
>>> getting garbage collected without problem.
>>> 
>>> I configured the app to do a heap dump when the error occured (Additional 
>>> arguments -XX:+HeapDumpOnOutOfMemoryError ) and used the Eclipse Memory 
>>> Analyzer Tool (http://www.eclipse.org/mat) and it reported the following 
>>> problem suspects:
>>> 
>>> 1,296 instances of "java.lang.Thread", loaded by "<system class loader>" 
>>> occupy 111,947,632 (43.21%) bytes.
>>> 1,292 instances of "er.extensions.eof.ERXEC", loaded by 
>>> "java.net.URLClassLoader @ 0x2aaab375b7c0" occupy 37,478,352 (14.46%) bytes.
>>> 1,280 instances of "er.extensions.appserver.ERXRequest", loaded by 
>>> "java.net.URLClassLoader @ 0x2aaab375b7c0" occupy 27,297,992 (10.54%) 
>>> bytes. 
>> 
>> It looks to me like your app had 1280 odd concurrent request handling 
>> threads running. Is it likely that they are getting deadlocked or not 
>> running to completion? Do you launch any new threads programmatically?
>> 
>> Try making a thread dump of the app and see what's running.
>> 
>> -- 
>> Seeya...Q
>> 
>> Quinton Dolan - qdo...@gmail.com
>> Gold Coast, QLD, Australia (GMT+10)
>> 
>> 
>> 
>> 
> 
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