Re: [xwiki-users] Heap memory errors when exporting workspace

Hi Sergiu, I am trying to upgrade from 2.4 to 2.5.1 Usually i export my workspace as a xar and then recreate everything by refreshing the mysql and tomcat installation. I do also get an export

of the database for backup. I use the xar file to re-import the workspace back after re-installing tomcat and mysql. This gives me a fresh install. This time it is failing as it has probably become very large. I know that

can upgrade by just replacing the $TOMCAT/webapps/xwiki folder with the

war file but i am trying to get a clean installation and the xar export

as a backup of the tomcat resources (jsps, css, javascript etc) as well. If i try the following will it it work? - Export the database using mysqldump - Re-install mysql - Re-install Tomcat - Re-import the database data - Re-install the 2.5 xwiki war file Using the above steps, would i be backing up everything in the wiki? This

where i get slightly confused. When i export as a xar file, what exactly

i exporting? is it just the contents of the database or does it include

jsp changes, css, javascript files etc.

Thanks On Sun, Nov 7, 2010 at 4:50 PM, Sergiu Dumitriu<sergiu(a)xwiki.com>

> On 11/07/2010 03:54 PM, Ziggy wrote: >> Hi guys, >> >> I am trying to export my xwiki workspace so but every time i try it i

>> the following error >> >> java.lang.OutOfMemoryError: Java heap space >> at java.util.Arrays.copyOf(Arrays.java:2882) >> at >> >

>> at >> java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390) >> at java.lang.StringBuffer.append(StringBuffer.java:224) >> at org.suigeneris.jrcs.rcs.impl.Node.toText(Node.java:719) >> at org.suigeneris.jrcs.rcs.Archive.toString(Archive.java:914) >> >> >> I know this is an error where the JVM has not enough memory. My JVM > memory >> settings are set as follows >> >> set "JAVA_OPTS=%JAVA_OPTS% -Dfile.encoding=UTF8 -Duser.timezone=GMT >> -Xmx1024m -XX:MaxPermSize=1024m" >> >> Everytime i try to increase it to anything above the above values

>> does not startup. Any clues as to how i can fix this? >> >> I am running xwiki on the following environment >> >> Tomcat 6.0.29 >> Xwiki 2.4.3 >> Mysql 5.1 >> Windows Xp > > What do you want to do with the contents of the wiki afterward? If you > want to migrate it to another machine, inside another mysql database, > then it would be simpler to dump and import the database data directly, > using mysqldump or something similar. > > You should only increase the -Xmx parameter, since this is the heap > memory, while MaxPermSize is used only for storing classes. Try > something like: > -Xmx2048m -XX:MaxPermSize=128m