Tomcat8 doesn't detect JRE > 8 when the default-jre package isn't installed

[Stefano Rivera]

[Impact]
Tomcat won't start, unless default-jre-headless or openjdk-8-jre-headless is installed.

If openjdk-11-jre is installed, it won't be used, unless default-jre-headless is installed.

[Test Case]
In a minimal install:

# apt install tomcat8 openjdk-11-jre-headless
# service tomcat8 start

If you get this error, you have reproduced the bug:
 * no JDK or JRE found - please set JAVA_HOME

If it starts, all is good

[Regression Potential]
For some users, tomcat may now use Java 11 where it was previously using Java 8.

[Bug Description]
The tomcat8 init script contains:

find_jdks()
{
    for java_version in 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

When the default-jre package is installed, this detects Java 11, but when it isn't, it doesn't.

# apt install tomcat8 openjdk-11-jre-headless
# /etc/init.d/tomcat8 start
 * no JDK or JRE found - please set JAVA_HOME

This was fixed in Debian in 8.5.31-1

[Robie Basak (racb)]

This looks reasonable but please could you fill in the SRU information as required by https://wiki.ubuntu.com/StableReleaseUpdates#Procedure?

[Stefano Rivera (stefanor)]

Yeah, just realised I forgot that, too.

[Steve Langasek (vorlon)]

Hello Stefano, or anyone else affected,

Accepted tomcat8 into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/tomcat8/8.5.30-1ubuntu1.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed.Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested and change the tag from verification-needed-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

[Stefano Rivera (stefanor)]

Works for me.

[Łukasz Zemczak (sil2100)]

Could you report which package version has been used for testing?

[Brian Murray (brian-murray)]

The version in -proposed works for me.

(bionic-amd64)root@impulse:/home/bdmurray# service tomcat8 start
 * Starting Tomcat servlet engine tomcat8 [ OK ]
(bionic-amd64)root@impulse:/home/bdmurray# apt-cache policy tomcat8
tomcat8:
  Installed: 8.5.30-1ubuntu1.3
  Candidate: 8.5.30-1ubuntu1.3
  Version table:
 *** 8.5.30-1ubuntu1.3 500
        500 http://192.168.10.7/ubuntu bionic-proposed/universe amd64 Packages
        100 /var/lib/dpkg/status
     8.5.30-1ubuntu1.2 500
        500 http://192.168.10.7/ubuntu bionic-updates/universe amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 Packages
     8.5.30-1ubuntu1 500
        500 http://192.168.10.7/ubuntu bionic/universe amd64 Packages

[Launchpad Janitor (janitor)]

This bug was fixed in the package tomcat8 - 8.5.30-1ubuntu1.3

---------------
tomcat8 (8.5.30-1ubuntu1.3) bionic; urgency=medium

  * Search for Java 10 and 11 runtimes (LP: #1780345)

 -- Stefano Rivera <email address hidden> Mon, 16 Jul 2018 20:41:29 -0700

[Brian Murray (brian-murray)]

The verification of the Stable Release Update for tomcat8 has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.