java.lang.OutOfMemoryError: Java heap space

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java.lang.OutOfMemoryError: Java heap space
at com.ibm.oti.vm.VM.getClassNameImpl(Native Method)
at com.ibm.oti.vm.AbstractClassLoader.getPackageName(AbstractClassLoader.java:372)
at com.ibm.oti.vm.BootstrapClassLoader.loadClass(BootstrapClassLoader.java:65)
at java.lang.ClassLoader.loadClass(ClassLoader.java:650)
at java.lang.ClassLoader.loadClass(ClassLoader.java:652)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:358)
at java.lang.ClassLoader.loadClass(ClassLoader.java:626)
at java.util.ResourceBundle$Control$1.run(ResourceBundle.java:928)
at java.util.ResourceBundle$Control$1.run(ResourceBundle.java:925)
at java.security.AccessController.doPrivileged(AccessController.java:228)
at java.util.ResourceBundle$Control.newBundle(ResourceBundle.java:924)
at java.util.ResourceBundle.processGetBundle(ResourceBundle.java:313)
at java.util.ResourceBundle.getBundle(ResourceBundle.java:276)
at java.util.ResourceBundle.getBundle(ResourceBundle.java:217)
at sun.util.resources.LocaleData$1.run(LocaleData.java:139)
at java.security.AccessController.doPrivileged(AccessController.java:228)
at sun.util.resources.LocaleData.getBundle(LocaleData.java:137)
at sun.util.resources.LocaleData.getTimeZoneNames(LocaleData.java:109)
at sun.util.TimeZoneNameUtility.getBundle(TimeZoneNameUtility.java:127)
at sun.util.TimeZoneNameUtility.retrieveDisplayNames(TimeZoneNameUtility.java:92)
at java.util.TimeZone.getDisplayNames(TimeZone.java:410)
at java.util.TimeZone.getDisplayName(TimeZone.java:361)
at java.text.SimpleDateFormat.subFormat(SimpleDateFormat.java:1127)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:916)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:886)
at java.text.DateFormat.format(DateFormat.java:327)
at weblogic.utils.string.SimpleCachingDateFormat.format(SimpleCachingDateFormat.java:42)
at weblogic.utils.string.CachingDateFormat.getDate(CachingDateFormat.java:94)
at weblogic.servlet.internal.ResponseHeaders.setDate(ResponseHeaders.java:326)
at weblogic.servlet.internal.ServletResponseImpl.writeHeaders(ServletResponseImpl.java:1142)
at weblogic.servlet.internal.ServletOutputStreamImpl.sendHeaders(ServletOutputStreamImpl.java:281)
at weblogic.servlet.internal.ServletOutputStreamImpl.flush(ServletOutputStreamImpl.java:118)
at weblogic.servlet.internal.ServletOutputStreamImpl.commit(ServletOutputStreamImpl.java:480)
at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:1512)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1462)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)

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