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From Tjard Kopka <Tjard.Ko...@dvag.com>
Subject Antwort: Re: Problems with ScratchFileBuffer and Finalizer: OutOfMemory
Date Thu, 17 Nov 2016 09:47:28 GMT

all the Finalizer-Instances in the heap dump have a reference to 

class java.lang.ref.Finalizer @ 0xc0005768 System Class 
|- java.lang.ref.Finalizer @ 0xed44ed10 
|  |- java.lang.ref.Finalizer @ 0xed43c9b0 
|  |- org.apache.pdfbox.io.ScratchFileBuffer @ 0xed44ecd0

where as example
        java.lang.ref.Finalizer @ 0xed44ed10 
has as referent;
        org.apache.pdfbox.io.ScratchFileBuffer @ 0xed44ecd0

I think the reason herefore is the overriden finalize method in 

    protected void finalize() throws Throwable
            if ((pageHandler != null) && LOG.isDebugEnabled())
                LOG.debug("ScratchFileBuffer not closed!");

I found this as a possible goog explanation for our out of memory crashes:
Objects which override this method (finalize) need to called by a 
background thread call finalizer, and they can't be cleaned up until this 
happens. If these tasks are short and you don't discard many of these it 
all works well. However if you are creating lots of these objects and/or 
their finalizers take a long time, the queue of objects to be finalized 
builds up. It is possible for this queue to use up all the memory.


[excerpt from memory analysis snipped]
> Nevertheless, do you have a quick fix or workaround for us?

No... from what I see, the 70,1% are not pdfbox but java itself?!

Consider updating to the current 1.8 JDK version... if the problem 
doesn't go away, try reproducing it with files you can share.

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