找不到jmap命令

Question

我尝试在我的CentOS服务器上使用jmap命令，但它一直告诉我，即使我安装了JDK，也找不到该命令。

以下是命令java -version的输出

java version "1.7.0_25"
OpenJDK Runtime Environment (rhel-2.3.10.4.el6_4-x86_64)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

如何解决此问题？

Answer 1

您应该能够在-1.8.0-openjdk-devel-debug或java-1.7.0-openjdk-devel-debug或Redhat/Centos上的java-1.6.0-openjdk-devel-debug包中找到java jmap。要安装它，请以root用户身份运行以下命令：

yum install java-1.8.0-openjdk-devel-debug

为了完整性，下面是检查哪些包包含jmap的命令：

yum whatprovides '*/jmap'

以下是示例输出：

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 2

下面的方法对我很有效：

sudo apt-get install openjdk-8-jdk openjdk-8-dbg

Answer 3

我的情况有点奇怪(在openjdk:8-jre Docker镜像中运行)，但这种组合很有效

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