jmap command not found

Question

I\'m trying to use the jmap command on my CentOS server but it keeps telling me that the command was not found even though I have the JDK installed.

Answer 1

it doesn't come default with JRE -- you should be able to install it with below command

yum install java-1.8.0-openjdk-devel-debug

Answer 2

My situation was a little strange (running inside the openjdk:8-jre Docker image), but this combination worked

cat /etc/debian_version # 8.6
apt install -t jessie-backports openjdk-8-jre-headless ca-certificates-java
apt-get install -f -y openjdk-8-jdk-headless
apt-get install -f -y openjdk-8-dbg

Answer 3

I found that on my system (elasticsearch container) it is excluded:

$ grep exclude /etc/yum.conf 
exclude=java-1.8.0-openjdk*

If I comment it out then I can see and install this package with yum install ...

Answer 4

You should be able to find jmap in the java-1.8.0-openjdk-devel-debug, or java-1.7.0-openjdk-devel-debug, or java-1.6.0-openjdk-devel-debug packages on Redhat/Centos. To install it, run the following as root:

yum install java-1.8.0-openjdk-devel-debug

For completeness, here's the command to check which packages include jmap:

yum whatprovides '*/jmap'

Here's a sample output:

1:java-1.6.0-openjdk-devel-1.6.0.37-1.13.9.4.el7_1.x86_64 : OpenJDK Development Environment
Repo        : updates
Matched from:
Filename    : /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.37.x86_64/bin/jmap



1:java-1.7.0-openjdk-devel-1.7.0.91-2.6.2.3.el7.x86_64 : OpenJDK Development Environment
Repo        : base
Matched from:
Filename    : /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64/bin/jmap



1:java-1.8.0-openjdk-devel-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment
Repo        : base
Matched from:
Filename    : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64/bin/jmap



1:java-1.8.0-openjdk-devel-debug-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment with full debug on
Repo        : base
Matched from:
Filename    : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64-debug/bin/jmap



1:java-1.8.0-openjdk-devel-debug-1.8.0.65-3.b17.el7.x86_64 : OpenJDK Development Environment with full debug on
Repo        : @base
Matched from:
Filename    : /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64-debug/bin/jmap

Answer 5

OpenJDK on centos doesn't include the jmap utility. test on another platform or use the jhat java_pid1234.hprof command to examine the dump after the fact on another platform.

jhat can be slow to run on large dumps and even run out of memory! I use jhat -port 7000 -J-mx2048m java_pid1234.hprof so you'll need plenty of ram on your computer.

Answer 6

for Debian "buster" - 10.3 -

cat /etc/debian_version # 10.3

echo "deb http://ftp.us.debian.org/debian sid main" > /etc/apt/sources.list.d/buster.list

apt-get update && apt-get install -f -y openjdk-8-jdk-headless openjdk-8-dbg