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Questions tagged [jvm]

The tag has no usage guidance.

0
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1answer
269 views

memory locking requested for elasticsearch process but memory is not locked

ElasticSearch 5.6.7 throws somewhat misleading following error and refuse to start: [2018-08-02T10:07:50,333][ERROR][o.e.b.Bootstrap ] [esm56n3] node validation exception [2] bootstrap ...
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0answers
24 views

does power supply redundant failure cause kernel panic?

Just after one of the power supply failed, the following error was recoreded in syslog. (the OS is ubuntu 14.04.) I am running a JVM (java virtual machine) with 64 HEAP on server with 128 RAM. do ...
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0answers
60 views

Tomcat AWS CPU Utilization Higher Than Expected

I recently got tasked with a project to move an Java application hosted with Tomcat that we wrote 3-4 years ago and that has been running in a clients data center to AWS. Right now we're in the middle ...
0
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1answer
77 views

JVM heap is being swapped causing GC go haywire - Tomcat

Info: # of VMs= 4, each with an instance of Tomcat 8.5.* in cluster Apps = 5 war applications- 2 UI applications and 3 Webservices. Java Version = java 1.8.* Configuratin = 2 LTMS and 2 Apache ...
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1answer
60 views

Tomcat Server Shuts Down with no trace

We have a couple of critical Java Web Apps running on a bunch of Apache Tomcat 7 servers, on top of Centos 6.x. From time to time, once or twice a week, one of the Tomcat instances suddenly shuts ...
4
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1answer
797 views

What is the /dev/urandom equivalent on Windows JVM level

Recently, I run into troubles because the lack of entropy and blocking rand IO caused hangs. On Linux, I can do the following: JAVA_OPTS=-Djava.security.egd=/dev/urandom ./myStartScript.sh What is ...
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0answers
15 views

JVM and Server Monitoring

I would like to be able to monitor the general load on my hardware, specifically the CPU utilisation, memory consumption and I/O usage. It would appear that collectd paired with InfluxDB are the de-...
0
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1answer
228 views

Elasticsearch: no JDK found… but JAVA_HOME seems set properly

When I'm trying to install elasticsearch (Ubuntu 16.04) I get the error message: elasticsearch[15885]: * no JDK found - please set JAVA_HOME But I have only one Java and I think JAVA_HOME is set ...
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520 views

JVM: JVMJ9VM015W Initialization error for library j9gc28(2): Failed to instantiate compressed references metadata; 200M requested

I am getting the following errors on the IBM Domino Server console. Running 9.0.1 FP8 Win64 HTTP Server: Using Web Configuration View HTTP JVM: JVMJ9VM015W Initialization error for library j9gc28(2): ...
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0answers
21 views

Neo4J with small graph uses a lot of memory on Ubuntu 16.04

I have installed Neo4J in an Ubuntu 16.04 virtual machine (Hyper-V) with 8GB and 4 cores. I have a very small graph (30 nodes) and it is used just for reading, it seldomly gets written to. We want to ...
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0answers
90 views

YARN AM logs report different time-stamp from what is shown in terminal and sparkscala shell

I am trying to understand why the following occurred: I have a Docker container with Yarn and Spark running fine except that the timestamp of that container was minus X hours of what I wanted it to ...
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0answers
39 views

JVM Heap usage charts interpretation

I'd like to ask for some tips how should I concern different JAVA apps memory usage line charts. Should I find any of them as "memory leak"? How my JVM profiling impacts on GC activity? Each of them ...
0
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1answer
283 views

Resource temporarily unavailable [fork] & insufficient memory for the Java Runtime Environment to continue

I have been experiencing this errors in my linux servers. Resource temporarily unavailable [fork] & insufficient memory for the Java Runtime Environment to continue I have increased the nproc ...
1
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1answer
13k views

Native memory allocation (mmap) failed to map bytes for committing reserved memory

I am running a download server in AWS t2.micro instance & I have configured max heap of 512 MB & min heap of 256 MB for my java process. I am performing a migration kind of process in a single ...
0
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1answer
325 views

SQLite3 is crashing the JVM

I am using sqlite-jdbc 3.7.2 when i run my application, SQLLite is crashing the JVM. It is not happening consistently but it happened twice. Please help to find the issue. A fatal error has been ...
0
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1answer
45 views

jruby web application deployed on glassfish server becoming slow as time passes

I have deployed war file of my jruby application on glassfish server. i have noticed that my application becomes slow as time passes. My server is of 30GB RAM but still application is very slow. ...
1
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1answer
232 views

Tomcat7 on docker - not responding issue

We have a tomcat7 running on top of docker container (official docker image). On rush hours after some time the tomcat hangs and no longer able to serve reqeusts (many requests are stuck and waiting ...
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1answer
205 views

How to configure Glassfish to allocate different memory size for JVM per web application

I have 2 Java web applications deployed on my Glassfish Enterprise Server v2.1.1. I want each of them to have different configurations for JVM options, specially for memory allocation. I have studied ...
0
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1answer
85 views

What would the OS see if the JVM was memory starved?

The real context here is elasticsearch but I'm curious what would happen more generally (minecraft / jetty / etc). When an OS process is out of system memory, you can see this behavior by checking ...
3
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1answer
484 views

Cassandra tmpdir change location

Cassandra is failing to start if /tmp is set as noexec, which is pretty much default these days: java.lang.NoClassDefFoundError: Could not initialize class com.sun.jna.Native at org.apache....
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0answers
78 views

The used heap memory keeps on increasing on managed servers even though the load test has ended, what could be the reason?

We are having a strange observation while performance testing our web application which is, even after the load test ends, the heap keeps on increasing, what could be the issue? The environment for PT ...
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1answer
3k views

UnknownHostException when enabling JMX in Java 8

Using Java 7, I can launch a JVM with JMX enabled without any problems using these properties: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote....