Dear All,
I am running Tomcat 8 on Ubuntu. After a few days of running successfully
my Tomcat's JVM crashes or becomes absolutely unresponsive because of OOME
errors similar to this in catalina.out:
--- cut -------
SEVERE:Memory usage is low, parachute is non existent, your system may
start failing.
java.lang.OutOfMemoryError: Java heap space
SEVERE:Memory usage is low, parachute is non existent, your system may
start failing.
java.lang.OutOfMemoryError: Java heap space
SEVERE:Memory usage is low, parachute is non existent, your system may
start failing.
java.lang.OutOfMemoryError: Java heap space
SEVERE:Memory usage is low, parachute is non existent, your system may
start failing.
java.lang.OutOfMemoryError: Java heap space
SEVERE:Memory usage is low, parachute is non existent, your system may
start failing.
java.lang.OutOfMemoryError: Java heap space
SEVERE:Memory usage is low, parachute is non existent, your system may
start failing.
java.lang.OutOfMemoryError: Java heap space: failed reallocation of scalar
replaced objects
Exception: java.lang.OutOfMemoryError thrown from the
UncaughtExceptionHandler in thread "http-nio-80-exec-2"
--- cut -------
My webapp used to run on Openshift v2. It only supported JRE 1.7 and some
Tomcat 7. Openshift v2 closed and I have moved to Google Compute Engine and
has been struggling since then running Tomcat 8 there.
At first I was using GCE micro instance with 600MB of RAM. Soon I started
having problems when Linux was killing Tomcat (OOM killer) as it considered
its JVM as a candidate for killing or if I specify a lower maximum heap
size I would eventually get OOME from JVM.
I moved to a GCE small instance which has 1.7GB of RAM but the problem
still occurs eventually though a bit later than on the 600MB VM because I
somewhat increased the maximum heap size.
It is strange because my webapp was running fine on Openshift though it was
Tomcat 7. I did not make any considerable changes to server.xml (with the
exception of those necessary to use Tomcat 8), I attach my server.xml too.
I read Tomcat's FAQ, Wiki pages and searched mailing lists but nothing
seems to fit my case.
I would accept the fact that my application has a memory leak problem but
it is absolutely unclear from this picture that it has one.
I have tried using Eclipse MAT to see what might be causing this and I
attach 2 screenshots that show that the majority of heap is occupied by
RequestInfo instances. I would be really grateful if someone could take a
look and tell me what might be happening there.
Looking forward to your reply.
Best regards,
Ivan
=============================================================================
My current environment:
g1-small 1 CPU which has 1.7GB RAM
Tomcat 8.0.32 (8.0.32-1ubuntu1.5) on Ubuntu 16.04.1.
$ java -version
openjdk version "1.8.0_151"
OpenJDK Runtime Environment (build 1.8.0_151-8u151-b12-0ubuntu0.16.04.2-b12)
OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)
$ less /var/lib/tomcat8/bin/setenv.sh
JAVA_OPTS="-Dlog4j.logging.dir=$CATALINA_BASE/logs \
-Dlogging.dir=$CATALINA_BASE/logs \
-Djava.awt.headless=true \
-Xms220M \
-Xmx220M \
-Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider \
-Djava.security.egd=file:/dev/./urandom \
-XX:+HeapDumpOnOutOfMemoryError \
-XX:HeapDumpPath=$CATALINA_BASE/logs/java_pid%p.hprof"
<?xml version='1.0' encoding='utf-8'?>
<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.startup.VersionLoggerListener" />
<Listener className="org.apache.catalina.security.SecurityListener"
minimumUmask="" />
<Listener className="org.apache.catalina.core.AprLifecycleListener"
SSLEngine="on" />
<Listener
className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
<Listener
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Listener
className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
<Service name="Catalina">
<Connector port="80" protocol="HTTP/1.1"
connectionTimeout="3000"
redirectPort="443" />
<Connector port="443" protocol="org.apache.coyote.http11.Http11NioProtocol"
maxThreads="150" SSLEnabled="true" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS"
KeystoreFile="***" KeystorePass="***"/>
<Engine name="Catalina" defaultHost="localhost">
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.RemoteIpValve"
protocolHeader="x-forwarded-proto" ></Valve>
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs"
prefix="localhost_access_log." suffix=".log"
requestAttributesEnabled="true"
pattern="combined" />
</Host>
</Engine>
</Service>
</Server>
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