[Bug 63551] New: Tomcat overrides default JAVA_HOME variable

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=63551

            Bug ID: 63551
           Summary: Tomcat overrides default JAVA_HOME variable
           Product: Tomcat 8
           Version: 8.5.39
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: apache....@marco.sulla.e4ward.com
  Target Milestone: ----

In /etc/init.d/tomcat8 there's this code:



# this is a work-around until there is a suitable runtime replacement
# for dpkg-architecture for arch:all packages
# this function sets the variable JDK_DIRS
find_jdks()
{
    for java_version in 11 10 9 8
    do
        for jvmdir in /usr/lib/jvm/java-${java_version}-openjdk-* \
                      /usr/lib/jvm/jdk-${java_version}-oracle-* \
                      /usr/lib/jvm/jre-${java_version}-oracle-* \
                      /usr/lib/jvm/java-${java_version}-oracle
        do
            if [ -d "${jvmdir}" ]
            then
                JDK_DIRS="${JDK_DIRS} ${jvmdir}"
            fi
        done
    done
}

# The first existing directory is used for JAVA_HOME (if JAVA_HOME is not
# defined in $DEFAULT)
JDK_DIRS="/usr/lib/jvm/default-java"
find_jdks

# Look for the right JVM to use
for jdir in $JDK_DIRS; do
    if [ -r "$jdir/bin/java" -a -z "${JAVA_HOME}" ]; then
      JAVA_HOME="$jdir"
    fi
done
export JAVA_HOME


Can't be JAVA_HOME overwritten only if it does not exists or is empty or
invalid?

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