In Eclipse IDE, if your program is consuming a lot of memory (loading big data) like this :
List<Domain> list = domainBo.findAllDomain(100000); for(Domain domain : list){ process(domain.getDomainName()); }
It can easily hit java.lang.OutOfMemoryError: Java heap space
:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at java.util.HashMap.<init>(HashMap.java:209) at java.util.LinkedHashMap.<init>(LinkedHashMap.java:181)
On Eclipse menu, clicks Run -> Run Configurations..
, select the Java application you want to run, clicks on theArguments
tab, update the VM arguments with the following options
-Xms<size> - Set initial Java heap size -Xmx<size> - Set maximum Java heap size
For example, -Xms512M -Xmx1024M
The memory settings in eclipse.ini
is allocated to Eclipse IDE only, not the program you want to run. A very common mistake is updated the heap size in eclipse.ini
, and expects it to solve above out of memory problem.
But, if your Eclipse IDE is always crashed by no reason, you can try to increase the heap size and perm gen ineclipse.ini
.
-startu openFile -showsplash //... -XX:MaxPermSize=512m -Xms512m -Xmx1024m //... -Xdock:icon=../Resources/Eclipse.icns -XstartOnFirstThread
P.S eclipse.ini is located in the Eclipse installation folder.
Eclipse – java.lang.OutOfMemoryError: Java heap space
http://www.mkyong.com/eclipse/eclipse-java-lang-outofmemoryerror-java-heap-space/