Installing a Java Development Environment on CentOS 7

1. Compilation Error: java.nio.file.NoSuchFileException

When compiling a Jenkins plugin, the following error is reported:

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mvn package

Compilation failure
[ERROR] java.nio.file.NoSuchFileException: /root/java/target/classes/META-INF/annotations/hudson.Extension

It turns out that Maven uses JAVA_HOME rather than PATH, so it cannot find a Java runtime. Java 11 does not work either — only Java 1.8 compiles correctly.

2. Installing the JDK

Install Java 11

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yum install -y java-11-openjdk-devel

Install Java 1.8

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yum install -y java-1.8.0-openjdk-devel

3. Selecting the JDK Version

Select the current JDK version:

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alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.7.10-4.el7_8.x86_64/bin/java)
*+ 2           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64/jre/bin/java)

After selecting 2, /usr/lib/jvm/java-openjdk is the currently selected version.

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ls -l /usr/lib/jvm

lrwxrwxrwx 1 root root   26 Jul  1 15:42 java -> /etc/alternatives/java_sdk
lrwxrwxrwx 1 root root   29 Jul  1 15:42 java-11 -> /etc/alternatives/java_sdk_11
lrwxrwxrwx 1 root root   37 Jul  1 15:42 java-11-openjdk -> /etc/alternatives/java_sdk_11_openjdk
drwxr-xr-x 8 root root 4096 Jul  1 15:42 java-11-openjdk-11.0.7.10-4.el7_8.x86_64
lrwxrwxrwx 1 root root   34 Jul  1 15:42 java-openjdk -> /etc/alternatives/java_sdk_openjdk
lrwxrwxrwx 1 root root   21 Jul  1 16:01 jre -> /etc/alternatives/jre
lrwxrwxrwx 1 root root   24 Jul  1 15:42 jre-11 -> /etc/alternatives/jre_11
lrwxrwxrwx 1 root root   32 Jul  1 15:42 jre-11-openjdk -> /etc/alternatives/jre_11_openjdk
lrwxrwxrwx 1 root root   40 Jul  1 15:42 jre-11-openjdk-11.0.7.10-4.el7_8.x86_64 -> java-11-openjdk-11.0.7.10-4.el7_8.x86_64
lrwxrwxrwx 1 root root   29 Jul  1 15:42 jre-openjdk -> /etc/alternatives/jre_openjdk

Check the Java version:

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java -version

openjdk version "1.8.0_252"
OpenJDK Runtime Environment (build 1.8.0_252-b09)
OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode

4. Configuring Environment Variables

Edit the file

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vim /etc/profile

Add the environment variables

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export JAVA_HOME=/usr/lib/jvm/java-openjdk
export JRE_HOME=/usr/lib/jvm/jre-openjdk

Make the environment variables take effect

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source /etc/profile

5. Uninstalling the JDK

Check the JDK installed in the current environment:

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rpm -aq | grep -i jdk

copy-jdk-configs-3.3-10.el7_5.noarch
java-1.8.0-openjdk-headless-1.8.0.252.b09-2.el7_8.x86_64
java-11-openjdk-headless-11.0.7.10-4.el7_8.x86_64
java-11-openjdk-devel-11.0.7.10-4.el7_8.x86_64
java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64
java-11-openjdk-11.0.7.10-4.el7_8.x86_64
java-1.8.0-openjdk-devel-1.8.0.252.b09-2.el7_8.x86_64

You do not need to remove them one by one; removing copy-jdk-configs is enough.

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yum remove -y copy-jdk-configs-3.3-10.el7_5.noarch