After the package installation is complete, the next step is to
make sure that the system can properly find the files. If you set
up your login scripts as recommended in The
Bash Shell Startup Files, update the environment by creating
the openjdk.sh
script, as the
root
user:
cat > /etc/profile.d/openjdk.sh << "EOF"
# Begin /etc/profile.d/openjdk.sh
# Set JAVA_HOME directory
JAVA_HOME=/opt/jdk
# Adjust PATH
pathappend $JAVA_HOME/bin
# Add to MANPATH
pathappend $JAVA_HOME/man MANPATH
# Auto Java CLASSPATH: Copy jar files to, or create symlinks in, the
# /usr/share/java directory. Note that having gcj jars with OpenJDK 8
# may lead to errors.
AUTO_CLASSPATH_DIR=/usr/share/java
pathprepend . CLASSPATH
for dir in `find ${AUTO_CLASSPATH_DIR} -type d 2>/dev/null`; do
pathappend $dir CLASSPATH
done
for jar in `find ${AUTO_CLASSPATH_DIR} -name "*.jar" 2>/dev/null`; do
pathappend $jar CLASSPATH
done
export JAVA_HOME
unset AUTO_CLASSPATH_DIR dir jar
# End /etc/profile.d/openjdk.sh
EOF
For allowing mandb to
include the OpenJDK man pages in its database, issue, as the
root
user:
cat >> /etc/man_db.conf << "EOF" &&
# Begin Java addition
MANDATORY_MANPATH /opt/jdk/man
MANPATH_MAP /opt/jdk/bin /opt/jdk/man
MANDB_MAP /opt/jdk/man /var/cache/man/jdk
# End Java addition
EOF
mkdir -p /var/cache/man &&
mandb -c /opt/jdk/man
OpenJDK uses its own format for
the CA certificates. The Java security modules use $JAVA_HOME
/lib/security/cacerts
by default. In order to
keep all the certificates in one place, we use /etc/ssl/java/cacerts.jks
. That file should be
generated using the system PKI trust store. The instructions on the
make-ca-0.8 page should be used to update the
file located in /etc/ssl/java
. Run
the conversion and setup a symlink in the default location as the
root
user:
/usr/sbin/make-ca -g --force && ln -sfv /etc/ssl/java/cacerts.jks /opt/jdk/lib/security/cacerts
Use the following commands to check if the cacerts
file has been successfully installed:
cd /opt/jdk bin/keytool -list -cacerts
At the prompt Enter keystore
password:
, enter changeit
(the default) or just
press the “Enter” key. If
the cacerts
file was installed
correctly, you will see a list of the certificates with related
information for each one. If not, you need to reinstall them.
If you later install a new JVM, you just have to create the symlink in the default location to be able to use the cacerts.
Last updated on 2018-03-25 13:47:21 -0700