[Laszlo-dev] Reentrant lock hell

[P T Withington]

My current source is trunk -r3598

On 2007-01-30, at 14:33 EST, Benjamin Shine wrote:

> In your current source, what is on these lines?
>>>> org.openlaszlo.cache.Cache$Item.<init>(Cache.java:898)

             mLock = new ReentrantLock();

>>> >       org.openlaszlo.cache.Cache.findItem(Cache.java:259)

                 item = new Item(key, enc, hasMemCache);

>>> >       org.openlaszlo.cm.CompilationManager.getItem

         Item item = findItem(key, enc, lockit);

>>> > (CompilationManager.java:610)

Eric has left this interesting note:

         // TODO: [2003-09-04 bloch]
         // Note: this now only happens when doLockAndLeaveActive is
         // false.  At some point we could rearchitect to remove
         // this wart

I don't have time to dig any deeper at this point, but clearly I  
tripped on the wart.

> (Hooray for line-by-line debugging information! I think pga turned  
> this on.)
>
> On Jan 30, 2007, at 11:22 AM, P T Withington wrote:
>
>> Me either.  It has something to do with the cache.  My suspicion  
>> is that something is getting serialized that does not unserialize  
>> in a later verison or some such which takes the code down some  
>> path it normally never hits.
>>
>> I did various rounds of stop/clean/build/start/install combined  
>> with actually rm -rf of the webapp dir from tomcat and it finally  
>> stopped.
>>
>> On 2007-01-30, at 14:06 EST, Henry Minsky wrote:
>>
>>> I have never figured out what causes that, it seems to persist  
>>> across server
>>> restarts, maybe a file lock, I thought it was only Winblows that  
>>> suffered
>>> from this though.
>>>
>>>
>>> On 1/30/07, P T Withington <ptw at openlaszlo.org> wrote:
>>>>
>>>> Well with several hits of the cache cleaning hammer, I seem to have
>>>> solve this.
>>>>
>>>> On 2007-01-30, at 13:45 EST, P T Withington wrote:
>>>>
>>>> > I am getting this when I try to load any app from my trunk
>>>> > sandbox.  I have never understood what causes this error or  
>>>> how to
>>>> > cure it.  Any hints?
>>>> >
>>>> > java.lang.NoClassDefFoundError: EDU/oswego/cs/dl/util/concurrent/
>>>> > ReentrantLock
>>>> >       org.openlaszlo.cache.Cache$Item.<init>(Cache.java:898)
>>>> >       org.openlaszlo.cache.Cache.findItem(Cache.java:259)
>>>> >       org.openlaszlo.cm.CompilationManager.getItem
>>>> > (CompilationManager.java:610)
>>>> >       org.openlaszlo.cm.CompilationManager.getLastModified
>>>> > (CompilationManager.java:594)
>>>> >
>>>> org.openlaszlo.servlets.responders.ResponderCompile.getLastModified
>>>> > (ResponderCompile.java:394)
>>>> >        
>>>> org.openlaszlo.servlets.responders.ResponderCompile.respondImpl
>>>> > (ResponderCompile.java:178)
>>>> >       org.openlaszlo.servlets.responders.Responder.respond
>>>> > (Responder.java:260)
>>>> >       org.openlaszlo.servlets.LZServlet._doGet(LZServlet.java: 
>>>> 441)
>>>> >       org.openlaszlo.servlets.LZServlet.doGet(LZServlet.java:355)
>>>> >       javax.servlet.http.HttpServlet.service(HttpServlet.java: 
>>>> 689)
>>>> >       javax.servlet.http.HttpServlet.service(HttpServlet.java: 
>>>> 802)
>>>>
>>>>
>>>
>>>
>>> -- 
>>> Henry Minsky
>>> Software Architect
>>> hminsky at laszlosystems.com
>>
>
> Benjamin Shine
> Software Engineer, Open Laszlo / Laszlo Systems
> ben at laszlosystems.com
>
>
>