I have a J2EE application running on an IBM Websphere Application Server on a Windows Operating System. Occasionally I see an OutOfMemoryError Exception with the following information in the javacore file. 1TISIGINFO Dump Event "systhrow" (00040000) Detail "java/lang/OutOfMemoryError":"Failed to create a thread: retVal -1073741830, errno 12" received Java is run with the following configurations: -Xms512m -Xmx1350m -Xscmx50M Analyzing the javacore file, the number of threads are just 124. Analyzing the heap dump, the memory occupied by the heap is about 500Mb. Given the relatively normal number of threads and heap size a lot lower than the maximum, I am trying to figure out why I see this error? I´m not sure if this helps, but here is the top section of the javacore file... NULL ------------------------------------------------------------------------ 0SECTION TITLE subcomponent dump routine NULL =============================== 1TISIGINFO Dump Event "systhrow" (00040000) Detail "java/lang/OutOfMemoryError":"Failed to create a thread: retVal -1073741830, errno 12" received 1TIDATETIME Date: 1970/01/01 at 00:00:00 1TIFILENAME Javacore filename: d:\WebSphere\AppServer\profiles\AppSrv01\javacore.19700101.000000.652.0003.txt NULL ------------------------------------------------------------------------ 0SECTION GPINFO subcomponent dump routine NULL ================================ 2XHOSLEVEL OS Level : Windows Server 2003 5.2 build 3790 Service Pack 2 2XHCPUS Processors - 3XHCPUARCH Architecture : x86 3XHNUMCPUS How Many : 2 NULL 1XHERROR2 Register dump section only produced for SIGSEGV, SIGILL or SIGFPE. NULL NULL ------------------------------------------------------------------------ 0SECTION ENVINFO subcomponent dump routine NULL ================================= 1CIJAVAVERSION J2RE 5.0 IBM J9 2.3 Windows Server 2003 x86-32 build j9vmwi3223-20080315 1CIVMVERSION VM build 20080314_17962_lHdSMr 1CIJITVERSION JIT enabled - 20080130_0718ifx2_r8 1CIRUNNINGAS Running as a standalone JVM 1CICMDLINE d:/WebSphere/AppServer/java/bin/java -Declipse.security -Dwas.status.socket=4434 -Dosgi.install.area=d:/WebSphere/AppServer -Dosgi.configuration.area=d:\WebSphere\AppServer\profiles\AppSrv01/configuration -Dosgi.framework.extensions=com.ibm.cds -Xshareclasses:name=webspherev61,nonFatal -Xscmx50M -Dcom.ibm.nio.DirectByteBuffer.SilentRetry=true -Xbootclasspath/p:d:/WebSphere/AppServer/java/jre/lib/ext/ibmorb.jar;d:/WebSphere/AppServer/java/jre/lib/ext/ibmext.jar -classpath d:\WebSphere\AppServer\profiles\AppSrv01/properties;d:/WebSphere/AppServer/properties;d:/WebSphere/AppServer/lib/startup.jar;d:/WebSphere/AppServer/lib/bootstrap.jar;d:/WebSphere/AppServer/lib/j2ee.jar;d:/WebSphere/AppServer/lib/lmproxy.jar;d:/WebSphere/AppServer/lib/urlprotocols.jar;d:/WebSphere/AppServer/deploytool/itp/batchboot.jar;d:/WebSphere/AppServer/deploytool/itp/batch2.jar;d:/WebSphere/AppServer/java/lib/tools.jar -Dibm.websphere.internalClassAccessMode=allow -Xms512m -Xmx1350m -Dws.ext.dirs=d:/WebSphere/AppServer/java/lib;d:\WebSphere\AppServer\profiles\AppSrv01/classes;d:/WebSphere/AppServer/classes;d:/WebSphere/AppServer/lib;d:/WebSphere/AppServer/installedChannels;d:/WebSphere/AppServer/lib/ext;d:/WebSphere/AppServer/web/help;d:/WebSphere/AppServer/deploytool/itp/plugins/com.ibm.etools.ejbdeploy/runtime -Dderby.system.home=d:/WebSphere/AppServer/derby -Dcom.ibm.itp.location=d:/WebSphere/AppServer/bin -Djava.util.logging.configureByServer=true -Duser.install.root=d:\WebSphere\AppServer\profiles\AppSrv01 -Djavax.management.builder.initial=com.ibm.ws.management.PlatformMBeanServerBuilder -Dwas.install.root=d:/WebSphere/AppServer -Dpython.cachedir=d:\WebSphere\AppServer\profiles\AppSrv01/temp/cachedir -Djava.util.logging.manager=com.ibm.ws.bootstrap.WsLogManager -Dserver.root=d:\WebSphere\AppServer\profiles\AppSrv01 -Dappserver.platform=was61 -Ddeploymentmgr.rmi.connection=ensi-nd01.sistema-cni.org.br:9809 -Dappserver.rmi.host=ensi-nd01.sistema-cni.org.br -Duser.timezone=GMT-3 -Djava.security.auth.login.config=d:\WebSphere\AppServer\profiles\AppSrv01/properties/wsjaas.conf -Djava.security.policy=d:\WebSphere\AppServer\profiles\AppSrv01/properties/server.policy com.ibm.wsspi.bootstrap.WSPreLauncher -nosplash -application com.ibm.ws.bootstrap.WSLauncher com.ibm.ws.runtime.WsServer d:\WebSphere\AppServer\profiles\AppSrv01\config ensi-nd01Cell01 ensi-aplic01Node01 lumis4.0.11 1CIJAVAHOMEDIR Java Home Dir: d:\WebSphere\AppServer\java\jre 1CIJAVADLLDIR Java DLL Dir: d:\WebSphere\AppServer\java\jre\bin 1CISYSCP Sys Classpath: d:/WebSphere/AppServer/java/jre/lib/ext/ibmorb.jar;d:/WebSphere/AppServer/java/jre/lib/ext/ibmext.jar;d:\WebSphere\AppServer\java\jre\lib\vm.jar;d:\WebSphere\AppServer\java\jre\lib\core.jar;d:\WebSphere\AppServer\java\jre\lib\charsets.jar;d:\WebSphere\AppServer\java\jre\lib\graphics.jar;d:\WebSphere\AppServer\java\jre\lib\security.jar;d:\WebSphere\AppServer\java\jre\lib\ibmpkcs.jar;d:\WebSphere\AppServer\java\jre\lib\ibmorb.jar;d:\WebSphere\AppServer\java\jre\lib\ibmcfw.jar;d:\WebSphere\AppServer\java\jre\lib\ibmorbapi.jar;d:\WebSphere\AppServer\java\jre\lib\ibmjcefw.jar;d:\WebSphere\AppServer\java\jre\lib\ibmjgssprovider.jar;d:\WebSphere\AppServer\java\jre\lib\ibmjsseprovider2.jar;d:\WebSphere\AppServer\java\jre\lib\ibmjaaslm.jar;d:\WebSphere\AppServer\java\jre\lib\ibmjaasactivelm.jar;d:\WebSphere\AppServer\java\jre\lib\ibmcertpathprovider.jar;d:\WebSphere\AppServer\java\jre\lib\server.jar;d:\WebSphere\AppServer\java\jre\lib\xml.jar; 1CIUSERARGS UserArgs: 2CIUSERARG -Xjcl:jclscar_23 2CIUSERARG -Dcom.ibm.oti.vm.bootstrap.library.path=d:\WebSphere\AppServer\java\jre\bin 2CIUSERARG -Dsun.boot.library.path=d:\WebSphere\AppServer\java\jre\bin 2CIUSERARG -Djava.library.path=d:\WebSphere\AppServer\java\jre\bin;.;D:\WebSphere\AppServer\bin;D:\WebSphere\AppServer\java\bin;D:\WebSphere\AppServer\java\jre\bin;D:\programas\oracle\product\10.2.0\client_1\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;c:\Program Files\Intel\DMIX 2CIUSERARG -Djava.home=d:\WebSphere\AppServer\java\jre 2CIUSERARG -Djava.ext.dirs=d:\WebSphere\AppServer\java\jre\lib\ext 2CIUSERARG -Duser.dir=d:\WebSphere\AppServer\profiles\AppSrv01 2CIUSERARG _j2se_j9=70912 0x7E7A0BE8 2CIUSERARG -Dconsole.encoding=Cp850 2CIUSERARG vfprintf 0x00401145 2CIUSERARG -Declipse.security 2CIUSERARG -Dwas.status.socket=4434 2CIUSERARG -Dosgi.install.area=d:/WebSphere/AppServer 2CIUSERARG -Dosgi.configuration.area=d:\WebSphere\AppServer\profiles\AppSrv01/configuration 2CIUSERARG -Dosgi.framework.extensions=com.ibm.cds 2CIUSERARG -Xshareclasses:name=webspherev61,nonFatal 2CIUSERARG -Xscmx50M 2CIUSERARG -Dcom.ibm.nio.DirectByteBuffer.SilentRetry=true 2CIUSERARG -Xbootclasspath/p:d:/WebSphere/AppServer/java/jre/lib/ext/ibmorb.jar;d:/WebSphere/AppServer/java/jre/lib/ext/ibmext.jar 2CIUSERARG -Dibm.websphere.internalClassAccessMode=allow 2CIUSERARG -Xms512m 2CIUSERARG -Xmx1350m 2CIUSERARG -Dws.ext.dirs=d:/WebSphere/AppServer/java/lib;d:\WebSphere\AppServer\profiles\AppSrv01/classes;d:/WebSphere/AppServer/classes;d:/WebSphere/AppServer/lib;d:/WebSphere/AppServer/installedChannels;d:/WebSphere/AppServer/lib/ext;d:/WebSphere/AppServer/web/help;d:/WebSphere/AppServer/deploytool/itp/plugins/com.ibm.etools.ejbdeploy/runtime 2CIUSERARG -Dderby.system.home=d:/WebSphere/AppServer/derby 2CIUSERARG -Dcom.ibm.itp.location=d:/WebSphere/AppServer/bin 2CIUSERARG -Djava.util.logging.configureByServer=true 2CIUSERARG -Duser.install.root=d:\WebSphere\AppServer\profiles\AppSrv01 2CIUSERARG -Djavax.management.builder.initial=com.ibm.ws.management.PlatformMBeanServerBuilder 2CIUSERARG -Dwas.install.root=d:/WebSphere/AppServer 2CIUSERARG -Dpython.cachedir=d:\WebSphere\AppServer\profiles\AppSrv01/temp/cachedir 2CIUSERARG -Djava.util.logging.manager=com.ibm.ws.bootstrap.WsLogManager 2CIUSERARG -Dserver.root=d:\WebSphere\AppServer\profiles\AppSrv01 2CIUSERARG -Dappserver.platform=was61 2CIUSERARG -Ddeploymentmgr.rmi.connection=ensi-nd01.sistema-cni.org.br:9809 2CIUSERARG -Dappserver.rmi.host=ensi-nd01.sistema-cni.org.br 2CIUSERARG -Duser.timezone=GMT-3 2CIUSERARG -Djava.security.auth.login.config=d:\WebSphere\AppServer\profiles\AppSrv01/properties/wsjaas.conf 2CIUSERARG -Djava.security.policy=d:\WebSphere\AppServer\profiles\AppSrv01/properties/server.policy 2CIUSERARG -Dinvokedviajava 2CIUSERARG -Djava.class.path=d:\WebSphere\AppServer\profiles\AppSrv01/properties;d:/WebSphere/AppServer/properties;d:/WebSphere/AppServer/lib/startup.jar;d:/WebSphere/AppServer/lib/bootstrap.jar;d:/WebSphere/AppServer/lib/j2ee.jar;d:/WebSphere/AppServer/lib/lmproxy.jar;d:/WebSphere/AppServer/lib/urlprotocols.jar;d:/WebSphere/AppServer/deploytool/itp/batchboot.jar;d:/WebSphere/AppServer/deploytool/itp/batch2.jar;d:/WebSphere/AppServer/java/lib/tools.jar 2CIUSERARG vfprintf 2CIUSERARG _port_library 0x7E7A04F8 2CIUSERARG -Xdump NULL