Refactor CLASSPATH configuration

[deric]

Currently the CLASSPATH environment variable is reconfigured at multiple places, custom systemd config looks like this:

ExecStart=/bin/sh -c 'set -x; \
   . /etc/zookeeper/conf/environment; \
   CLASSPATH="/usr/lib/zookeeper/zookeeper.jar:/usr/lib/zookeeper/lib/*:$CLASSPATH"; \
   CLASSPATH="$([ -r /usr/lib/zookeeper/bin/zkEnv.sh ] && . /usr/lib/zookeeper/bin/zkEnv.sh ; echo $CLASSPATH)"; \
   mkdir -p /var/log/zookeeper; \
   $JAVA "-Dzookeeper.log.dir=/var/log/zookeeper" "-Dzookeeper.root.logger=$ZOO_LOG4J_PROP" -cp "$CLASSPATH" $JAVA_OPTS "$ZOOMAIN" "$ZOOCFG"'

in /etc/zookeeper/conf/environment file is CLASSPATH set only for archive install method:

<% if scope.lookupvar('zookeeper::install_method') != 'archive' -%>
# TODO this is really ugly
# How to find out, which jars are needed?
# seems, that log4j requires the log4j.properties file to be in the classpath
CLASSPATH="$ZOOCFGDIR:/usr/share/java/jline.jar:/usr/share/java/log4j-1.2.jar:/usr/share/java/xercesImpl.jar:/usr/share/java/xmlParserAPIs.jar:/usr/share/java/netty.jar:/usr/share/java/slf4j-api.jar:/usr/share/java/slf4j-log4j12.jar:/usr/share/java/zookeeper.jar:$CLASSPATH"
<% end -%>

Each OS might have slightly different CLASSPATH:

• Debian: /usr/share/java/zookeeper.jar
• CentOS: /usr/lib/zookeeper/lib/*:/usr/lib/zookeeper/zookeeper.jar

Originally reported in #103.

[matthewmrichter]

Any progress on this issue? It's currently hosing me on centos 7 it appears. Error: Could not find or load main class org.apache.zookeeper.server.quorum.QuorumPeerMain

Is the only alternative to use archive?

[mszymo]

@matthewmrichter and anyone else struggling to get this working on centos 7 I got a workaround from here:

#103

Pass in this parameter into the module class:
java_opts => '-cp "/usr/lib/zookeeper/lib/*:/usr/lib/zookeeper/zookeeper.jar"'

It adds /usr/lib/zookeeper/lib/*:/usr/lib/zookeeper/zookeeper.jar to the end of the class path which is what it needs to work on centos 7.