Hibernate: OutOfMemoryError persisting Blob when printing log message

Question

I have a Hibernate Entity:

@Entity
class Foo {
    //...
    @Lob
    public byte[] getBytes() { return bytes; }
    //....
}

My VM is configured with a maximum heap size of 512 MB. When I try to persist an object which has a 75 MB large object, I get an OutOfMemoryError.

The names of the methods in the stack trace (StringBuilder, ByteArrayBlobType.toLoggableString, pretty.Printer.toString) suggest that hibernate is trying to write a very large log message that contains my object.

Am I correct about why hibernate is using so much memory? What is the simplest way to work around this problem?

java.lang.OutOfMemoryError: Java heap space
at java.lang.AbstractStringBuilder.<init>(AbstractStringBuilder.java:44)
at java.lang.StringBuilder.<init>(StringBuilder.java:81)
at org.hibernate.type.ByteArrayBlobType.toString(ByteArrayBlobType.java:117)
at org.hibernate.type.ByteArrayBlobType.toLoggableString(ByteArrayBlobType.java:127)
at org.hibernate.pretty.Printer.toString(Printer.java:53)
at org.hibernate.pretty.Printer.toString(Printer.java:90)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:97)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at org.jboss.seam.persistence.HibernateSessionProxy.flush(HibernateSessionProxy.java:181)

Did you disable logging for hibernate?

notnoop
– notnoop

2009-11-17 17:33:15 +00:00
Commented Nov 17, 2009 at 17:33 — notnoop
– notnoop, Commented Nov 17, 2009 at 17:33

paul · Accepted Answer · 2009-11-17 19:18:14Z

3

I solved the problem. Turning off logging did fix the problem, but I didn't understand that when running under the JBoss application server, the server's own log4j.xml file overrides whatever I put the in classpath of the application.

I opened up /jboss-4.2.3.GA/server/default/conf/log4.xml, and inserted this:

<category name="org.hibernate">
    <priority value="ERROR"/>
</category>

This fixes the issue I am seeing.

answered Nov 17, 2009 at 19:18

paul

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1 Comment

Anton Kuzmin Over a year ago

If you want to fix this and still have hibernate debug messages: <category name="org.hibernate.event.def.AbstractFlushingEventListener"> <priority value="INFO" /> </category>

delfuego · Accepted Answer · 2009-11-17 17:38:07Z

0

The first test is to see if it really is a logging issue. What logger are you using? If it's log4j, then you can try to turn off all logging from Hibernate with the following line in your log4j.properties file:

log4j.logger.org.hibernate=OFF

That might not be the ultimate, ideal way for your app to operate, but it might help you test whether logging is the issue.

answered Nov 17, 2009 at 17:38

delfuego

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1 Comment

paul Over a year ago

@delfuego: Thanks for the tip about how to disable it. I created an empty file in the root of my classpath and added that line to it, and I'm still getting a lot of messages that come from hibernate in the console, for example: 12:44:42,530 INFO [STDOUT] Hibernate: /* select o from Permission o */ select permission0_.id as id21_, permission0_ I will go look for some info about how to disable logging, since this isn't working for me.

Justin · Accepted Answer · 2009-11-17 17:41:09Z

0

The pretty printer is probably converting the bytes to hex notation (e.g. '0x55 0xF3 ...)', so for each byte in the blob you get 4 bytes of output so 300M of output, that and buffering, with other stuff in your VM probably puts you over the limit.

answered Nov 17, 2009 at 17:41

Justin

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2 Comments

paul Over a year ago

That's what I am thinking. Now I just need to know how to turn that "feature" off. :)

opyate Over a year ago

How about the Hibernate properties hibernate.show_sql=false and hibernate.format_sql=false ?

opyate · Accepted Answer · 2010-09-24 15:08:28Z

0

What if you try the following two Hibernate properties?

hibernate.show_sql=false
hibernate.format_sql=false

answered Sep 24, 2010 at 15:08

opyate

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