Installing Java 7 JDK on CentOS 7

Openjdk packages on CentOS 7 come in a JRE and a JDK (as you’d expect). If you install java-1.7.0-openjdk you get just the JRE:

$ sudo yum install java-1.7.0-openjdk

$ java -version

java version "1.7.0_151"

OpenJDK Runtime Environment (rhel-2.6.11.1.el7_4-x86_64 u151-b00)

OpenJDK 64-Bit Server VM (build 24.151-b00, mixed mode)

Starting up WLS 10.3.6:

wlserver_10.3]$ cd server/

$ cd bin

$ . ./setWLSEnv.sh

The JDK wasn’t found in directory /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64.

Please edit the startWebLogic.sh script so that the JAVA_HOME

variable points to the location of your JDK.

$ cd /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64

$ ls

ASSEMBLY_EXCEPTION  jre  jre-abrt  LICENSE  THIRD_PARTY_README

Only a JRE there, no JDK.

From here, install the devel package too:

sudo yum install java-1.7.0-openjdk-devel

Now we look good:

$ . ./setWLSEnv.sh

CLASSPATH=/home/kev/Oracle/Middleware/patch_wls1036/profiles/default/sys_manifest_classpath/weblogic_patch.jar:/home/kev/Oracle/Middleware/patch_ocp371/profiles/default/sys_manifest_classpath/weblogic_patch.jar:/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64/lib/tools.jar:/home/kev/Oracle/Middleware/wlserver_10.3/server/lib/weblogic_sp.jar:/home/kev/Oracle/Middleware/wlserver_10.3/server/lib/weblogic.jar:/home/kev/Oracle/Middleware/modules/features/weblogic.server.modules_10.3.6.0.jar:/home/kev/Oracle/Middleware/wlserver_10.3/server/lib/webservices.jar:/home/kev/Oracle/Middleware/modules/org.apache.ant_1.7.1/lib/ant-all.jar:/home/kev/Oracle/Middleware/modules/net.sf.antcontrib_1.1.0.0_1-0b2/lib/ant-contrib.jar:

PATH=/home/kev/Oracle/Middleware/wlserver_10.3/server/bin:/home/kev/Oracle/Middleware/modules/org.apache.ant_1.7.1/bin:/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64/jre/bin:/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64/bin:/home/kev/Oracle/Middleware/wlserver_10.3/server/bin:/home/kev/Oracle/Middleware/modules/org.apache.ant_1.7.1/bin:/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64/jre/bin:/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.151-2.6.11.1.el7_4.x86_64/bin:/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/kev/.local/bin:/home/kev/bin

Your environment has been set.

Good to go!