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Java PermGen out of memory exception

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  Java PermGen out of memory exception fredliu@google.com - 2014-03-28 16:48 -0700
    Re: Java PermGen out of memory exception Arne Vajhøj <arne@vajhoej.dk> - 2014-03-28 20:23 -0400
      Re: Java PermGen out of memory exception Jeff Higgins <jeff@invalid.invalid> - 2014-03-28 22:39 -0400
        Re: Java PermGen out of memory exception Jeff Higgins <jeff@invalid.invalid> - 2014-03-28 22:53 -0400
          Re: Java PermGen out of memory exception Jeff Higgins <jeff@invalid.invalid> - 2014-03-28 23:04 -0400
            Re: Java PermGen out of memory exception Arne Vajhøj <arne@vajhoej.dk> - 2014-03-28 23:14 -0400
              Re: Java PermGen out of memory exception Jeff Higgins <jeff@invalid.invalid> - 2014-03-29 09:02 -0400
                Re: Java PermGen out of memory exception Jeff Higgins <jeff@invalid.invalid> - 2014-03-29 09:21 -0400
                  Re: Java PermGen out of memory exception Arne Vajhøj <arne@vajhoej.dk> - 2014-03-29 09:35 -0400
                    Re: Java PermGen out of memory exception Jeff Higgins <jeff@invalid.invalid> - 2014-03-29 10:32 -0400
    Re: Java PermGen out of memory exception Roedy Green <see_website@mindprod.com.invalid> - 2014-03-28 17:42 -0700
      Re: Java PermGen out of memory exception Arne Vajhøj <arne@vajhoej.dk> - 2014-03-28 21:59 -0400

#27897 — Java PermGen out of memory exception

Hi,

I'm getting the PermGen exception from our web service. Just want to check other than analyzing through memory tools, are there any known bad practices which may cause PermGen memory leak? Thanks

The code of the sevlet
https://cs.corp.google.com/#piper///depot/google3/java/com/google/corp/bizapps/rews/spacesaver/web/nanny/BookingRemoverServlet.java

I've bumped up the memory size but the issue still exists.
"-XX:MaxPermSize=160m",

E0327 16:52:17.790999 56 GSE worker #22 HttpConnectionImpl.run caught a throwable
java.lang.OutOfMemoryError: PermGen space
       at java.lang.ClassLoader.defineClass(ClassLoader.java:795)
       at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
       at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
       at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
       at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
       at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
       at java.lang.ClassLoader.loadClass(ClassLoader.java:427)
       at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.ja

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#27898

On 3/28/2014 7:48 PM, fredliu@google.com wrote:
> I'm getting the PermGen exception from our web service. Just want to check other than analyzing through memory tools, are there any known bad practices which may cause PermGen memory leak? Thanks
>
> The code of the sevlet
> https://cs.corp.google.com/#piper///depot/google3/java/com/google/corp/bizapps/rews/spacesaver/web/nanny/BookingRemoverServlet.java
>
> I've bumped up the memory size but the issue still exists.
> "-XX:MaxPermSize=160m",
>
> E0327 16:52:17.790999 56 GSE worker #22 HttpConnectionImpl.run caught a throwable
> java.lang.OutOfMemoryError: PermGen space
>         at java.lang.ClassLoader.defineClass(ClassLoader.java:795)

PermGen is used for classs definitions.

If you are leaking it then it is often because you are dynamically
generating classes and loading them continuously.

But maybe you are not leaking but just need a lot.

160 MB is not that much. You could try with 300 MN and see if the app
can keep running.

Arne

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#27902

On 03/28/2014 08:23 PM, Arne Vajhøj wrote:
> On 3/28/2014 7:48 PM, fredliu@google.com wrote:
>> I'm getting the PermGen exception from our web service.
> But maybe you are not leaking but just need a lot.

This thread led me here. Thanks.
<http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/toc.html>

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#27903

On 03/28/2014 10:39 PM, Jeff Higgins wrote:
> On 03/28/2014 08:23 PM, Arne Vajhøj wrote:
>> On 3/28/2014 7:48 PM, fredliu@google.com wrote:
>>> I'm getting the PermGen exception from our web service.
>> But maybe you are not leaking but just need a lot.
>
> This thread led me here. Thanks.
> <http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/toc.html>
>
Generally <http://docs.oracle.com/javase/7/docs/webnotes/tsg/>
Specifically 
<http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/memleaks.html>

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#27904

On 03/28/2014 10:53 PM, Jeff Higgins wrote:
> On 03/28/2014 10:39 PM, Jeff Higgins wrote:
>> On 03/28/2014 08:23 PM, Arne Vajhøj wrote:
>>> On 3/28/2014 7:48 PM, fredliu@google.com wrote:
>>>> I'm getting the PermGen exception from our web service.
>>> But maybe you are not leaking but just need a lot.
>>
>> This thread led me here. Thanks.
>> <http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/toc.html>
>>
> Generally <http://docs.oracle.com/javase/7/docs/webnotes/tsg/>
> Specifically
> <http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/memleaks.html>
>
>
Well, it seems the Java 8 docs are easier to get to:
<http://docs.oracle.com/javase/8/docs/>
<http://docs.oracle.com/javase/8/docs/technotes/guides/tsgvm/index.html>
<http://docs.oracle.com/javase/8/docs/technotes/guides/tsgvm/memleaks.html#sthref38>

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#27905

On 3/28/2014 11:04 PM, Jeff Higgins wrote:
> On 03/28/2014 10:53 PM, Jeff Higgins wrote:
>> On 03/28/2014 10:39 PM, Jeff Higgins wrote:
>>> On 03/28/2014 08:23 PM, Arne Vajhøj wrote:
>>>> On 3/28/2014 7:48 PM, fredliu@google.com wrote:
>>>>> I'm getting the PermGen exception from our web service.
>>>> But maybe you are not leaking but just need a lot.
>>>
>>> This thread led me here. Thanks.
>>> <http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/toc.html>
>>>
>> Generally <http://docs.oracle.com/javase/7/docs/webnotes/tsg/>
>> Specifically
>> <http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/memleaks.html>
>>
>>
>>
> Well, it seems the Java 8 docs are easier to get to:
> <http://docs.oracle.com/javase/8/docs/>
> <http://docs.oracle.com/javase/8/docs/technotes/guides/tsgvm/index.html>
> <http://docs.oracle.com/javase/8/docs/technotes/guides/tsgvm/memleaks.html#sthref38>

Hmm.

I thought that permgen was gone in Java 8??

Arne

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#27906

On 03/28/2014 11:14 PM, Arne Vajhøj wrote:
> On 3/28/2014 11:04 PM, Jeff Higgins wrote:

>> Well, it seems the Java 8 docs are easier to get to:
>> <http://docs.oracle.com/javase/8/docs/technotes/guides/tsgvm/memleaks.html#sthref38>
>>
>
> Hmm.
>
> I thought that permgen was gone in Java 8??
>
? According to JEP 122 removing the permgen space was a funded project.
Maybe that didn't extend to updating the documentation.

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#27907

On 03/29/2014 09:02 AM, Jeff Higgins wrote:
> On 03/28/2014 11:14 PM, Arne Vajhøj wrote:
>> On 3/28/2014 11:04 PM, Jeff Higgins wrote:
>
>>> Well, it seems the Java 8 docs are easier to get to:
>>> <http://docs.oracle.com/javase/8/docs/technotes/guides/tsgvm/memleaks.html#sthref38>
>>>
>>>
>>
>> Hmm.
>>
>> I thought that permgen was gone in Java 8??
>>
> ? According to JEP 122 removing the permgen space was a funded project.
> Maybe that didn't extend to updating the documentation.
>
Ah. Current state is listed as Funded, not Complete.
<http://openjdk.java.net/jeps/122>
See: Process States
<http://openjdk.java.net/jeps/1>

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#27908

On 3/29/2014 9:21 AM, Jeff Higgins wrote:
> On 03/29/2014 09:02 AM, Jeff Higgins wrote:
>> On 03/28/2014 11:14 PM, Arne Vajhøj wrote:
>>> On 3/28/2014 11:04 PM, Jeff Higgins wrote:
>>
>>>> Well, it seems the Java 8 docs are easier to get to:
>>>> <http://docs.oracle.com/javase/8/docs/technotes/guides/tsgvm/memleaks.html#sthref38>
>>>>
>>>>
>>>>
>>>
>>> Hmm.
>>>
>>> I thought that permgen was gone in Java 8??
>>>
>> ? According to JEP 122 removing the permgen space was a funded project.
>> Maybe that didn't extend to updating the documentation.
>>
> Ah. Current state is listed as Funded, not Complete.
> <http://openjdk.java.net/jeps/122>
> See: Process States
> <http://openjdk.java.net/jeps/1>

That document also has:

"Updated	2012/12/4"

And 
http://www.oracle.com/technetwork/java/javase/8-whats-new-2157071.html 
states:

<quote>
* HotSpot
...
* Removal of PermGen.
</quote>

Arne

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#27909

On 03/29/2014 09:35 AM, Arne Vajhøj wrote:
> On 3/29/2014 9:21 AM, Jeff Higgins wrote:
>> On 03/29/2014 09:02 AM, Jeff Higgins wrote:
>>> On 03/28/2014 11:14 PM, Arne Vajhøj wrote:
>>>> On 3/28/2014 11:04 PM, Jeff Higgins wrote:
>>>
>>>>> Well, it seems the Java 8 docs are easier to get to:
>>>>> <http://docs.oracle.com/javase/8/docs/technotes/guides/tsgvm/memleaks.html#sthref38>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>> Hmm.
>>>>
>>>> I thought that permgen was gone in Java 8??
>>>>
>>> ? According to JEP 122 removing the permgen space was a funded project.
>>> Maybe that didn't extend to updating the documentation.
>>>
>> Ah. Current state is listed as Funded, not Complete.
>> <http://openjdk.java.net/jeps/122>
>> See: Process States
>> <http://openjdk.java.net/jeps/1>
>
> That document also has:
>
> "Updated    2012/12/4"
>
> And
> http://www.oracle.com/technetwork/java/javase/8-whats-new-2157071.html
> states:
>
> <quote>
> * HotSpot
> ...
> * Removal of PermGen.
> </quote>
>
Yep. I guess that the third "Impact" listed at the bottom of the page:
"Documentation: References to the permanent generation will need to be 
removed." is one item that keeps the page from being updated with a 
status of "Complete".

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#27899

On Fri, 28 Mar 2014 16:48:29 -0700 (PDT), fredliu@google.com wrote,
quoted or indirectly quoted someone who said :

>I'm getting the PermGen exception

see http://mindprod.com/packratting.html
-- 
Roedy Green Canadian Mind Products http://mindprod.com
"A great lathe operator commands several times the wage of an average lathe
operator, but a great writer of software code is worth 10,000 times the
price of an average software writer."
~ Bill Gates

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#27900

On 3/28/2014 8:42 PM, Roedy Green wrote:
> On Fri, 28 Mar 2014 16:48:29 -0700 (PDT), fredliu@google.com wrote,
> quoted or indirectly quoted someone who said :
>
>> I'm getting the PermGen exception
>
> see http://mindprod.com/packratting.html

Link does not work.

http://mindprod.com/jgloss/packratting.html

does.

But since the text does not relate to PermGen, then it
is irrelevant anyway.

Arne

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