AntTools: OutOfMemoryError: java heap space

MistaMoasn · **Posted:** Tue Nov 15, 2005 3:52 am

hi!

i get the following exception when using the hibernate ant tools for reverse engineering in eclipse 3.1 (jdk1.5)

Code:

[hibernatetool] SCHWERWIEGEND: Method get threw exception for reference $templates in template pojo/Pojo.vm at  [17,1]

BUILD FAILED
D:\workspace31\DataLogic\build.xml:132: org.hibernate.tool.hbm2x.ExporterException: MethodInvocationException while processing template Pojo. Invocation of method 'get' in  class org.hibernate.tool.hbm2x.TemplateHelper$Templates threw exception class java.lang.OutOfMemoryError : Java heap space

i tried to set the min and max heap size in the eclipse.ini to 512 respectively 768 and i even tried 768 respectively 1024 with the same effect.

what could be the reason for this?

best regards
patrik

Hibernate version:
3.1rc2
hibernate tools that ship with jbosside1.5rc1

Mapping documents:
none

Code between sessionFactory.openSession() and session.close():
none

Full stack trace of any exception that occurs:

Name and version of the database you are using:
computer associates ingres 3.0.2

The generated SQL (show_sql=true):
none

Debug level Hibernate log excerpt:

max · **Posted:** Tue Nov 15, 2005 4:40 am

hmm - how big a table space are you reverse engineering ?

MistaMoasn · **Posted:** Thu Nov 17, 2005 3:18 am

i'm trying to reverse engineer 571 tables with up to 58 columns in the "worst" case.

i tried one table with 58 columns... it worked.

any hints for avoiding this heap error?

afattahi · **Joined:** Mon Jan 24, 2005 11:56 am **Posts:** 24

Hi,

Well, It is good idea to increase the amount of java memeory usage and heap size by using -Xms and -Xmx
-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap size

the java start up will look some thing like java -Xms1024 ....

To set the java vm parameter for ant, I think u should run ant manualy like this

Code:

java -Dant.home=c:\ant org.apache.tools.ant.Main [options] [target]
java -Dant.home=c:\ant org.apache.tools.ant.launch.Launcher [options] [target]

And set the -Xms options for java like this:

Code:

java -Xms1024 -Dant.home=c:\ant org.apache.tools.ant.Main [options] [target]
java -Xms1024 -Dant.home=c:\ant org.apache.tools.ant.launch.Launcher [options] [target]

Take a look at
http://ant.apache.org/manual/running.html#sysprops

May be there are other ways for setting java vm properties fo ant.

Regards,
Alireza Fattahi
--------------------------
Please rate if it helped!

MistaMoasn · **Posted:** Thu Nov 17, 2005 5:01 am

thanks afattahi... a call like this solved my problem:

Code:

java -Xms700m -Xmx1024m -cp n:\lib\ant\1.6.2\lib\ant-launcher.jar -Dant.home=n:\lib\ant\1.6.2 org.apache.tools.ant.launch.Launcher hibernate 

it seems that the eclipse.ini heap sizes for the virtual machine is just for eclipse itself and ant crashes without using this properties.

maybe you got a hint how set up ant in eclipse to use a bigger heap size?

best regards
patrik

max · **Posted:** Thu Nov 17, 2005 12:22 pm

its done on one of the tabs in the external tools dialog.

MistaMoasn · **Posted:** Mon Nov 21, 2005 8:02 am

it now works with the ant tools and the eclipse plugin...

thank you!

jacksonchu · **Joined:** Wed Dec 07, 2005 11:55 am **Posts:** 5

Tips worked.
Thanks.