JDeveloper: An expected severe error has occured

Popup to show An expected severe error has occured in JDeveloper

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Error details

Uncaught exception
java.lang.OutOfMemoryError: Java heap space
  j.util.Arrays.copyOf(Arrays.java:2882)
  j.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
  j.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390)
  j.lang.StringBuffer.append(StringBuffer.java:224)
  org.tmatesoft.svn.core.SVNErrorMessage.getFullMessage(SVNErrorMessage.java:257)
  org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:58)
  org.tmatesoft.svn.core.internal.wc.admin.SVNAdminAreaFactory.open(SVNAdminAreaFactory.java:163)
  org.tmatesoft.svn.core.internal.wc.admin.SVNWCAccess.doOpen(SVNWCAccess.java:364)
  org.tmatesoft.svn.core.internal.wc.admin.SVNWCAccess.open(SVNWCAccess.java:272)
  org.tmatesoft.svn.core.internal.wc.admin.SVNWCAccess.open(SVNWCAccess.java:265)
  org.tmatesoft.svn.core.internal.wc.admin.SVNWCAccess.openAnchor(SVNWCAccess.java:145)
  org.tmatesoft.svn.core.wc.SVNStatusClient.doStatus(SVNStatusClient.java:320)
  org.tmatesoft.svn.core.javahl.SVNClientImpl.status(SVNClientImpl.java:296)
  org.tmatesoft.svn.core.javahl.SVNClientImpl.status(SVNClientImpl.java:278)
  org.tigris.subversion.svnclientadapter.javahl.AbstractJhlClientAdapter.getStatus(AbstractJhlClientAdapter.java:480)
  org.tigris.subversion.svnclientadapter.svnkit.SvnKitClientAdapter.getStatus(SvnKitClientAdapter.java:141)
  org.tigris.subversion.svnclientadapter.javahl.AbstractJhlClientAdapter.getStatus(AbstractJhlClientAdapter.java:466)
  o.ji.vcs.svn.SVNURLInfoCacheSimpleStrategy.getURLInfo(SVNURLInfoCacheSimpleStrategy.java:79)
  o.ji.vcs.svn.SVNURLInfoCache.getPropStatus(SVNURLInfoCache.java:59)
  o.ji.vcs.svn.SVNStatusResolver.getStatus(SVNStatusResolver.java:159)
  o.ji.vcs.svn.SVNStatusResolver.populateStatuses(SVNStatusResolver.java:82)
  o.ji.vcs.generic.GenericClient$2.getImpl(GenericClient.java:531)
  o.j.vcs.spi.VCSStatusCache.getValuesImpl(VCSStatusCache.java:31)
  o.j.vcs.spi.VCSURLBasedCache.getValuesImpl(VCSURLBasedCache.java:204)
  o.j.vcs.changelist.ChangeListLocalStatusCache$2.call(ChangeListLocalStatusCache.java:78)
  o.j.vcs.spi.VCSURLBasedCache.callUnderWriteLock(VCSURLBasedCache.java:224)
  o.j.vcs.changelist.ChangeListLocalStatusCache.getValuesImpl(ChangeListLocalStatusCache.java:73)
  o.j.vcs.spi.VCSURLBasedCache.getValues(VCSURLBasedCache.java:107)
  o.j.vcs.changelist.ChangeListEventQueue.filterByStatus(ChangeListEventQueue.java:513)
  o.j.vcs.changelist.ChangeListEventQueue.processRequeryEvent(ChangeListEventQueue.java:373)
  o.j.vcs.changelist.ChangeListEventQueue.processEvent(ChangeListEventQueue.java:258)
  o.j.vcs.changelist.ChangeListEventQueue.processEvents(ChangeListEventQueue.java:685)

When you get this error, probably there is an error with your application too, close the application and JDeveloper and start from scratch.

Tips to avoid this:
1. While working with JDeveloper, you need to close and open application so many times. When I want to delete an application, I will choose to Close Application rather from Jdeveloper and then delete the application folder physically later after closing JDeveloper.
2. After running JDeveloper for long, it starts consuming more memory, give it a break, close the JDeveloper and open it again.
3. Always refer the external jars as user library, create a library name to your physical path and then extend the library to add external jars to the classpath.