Github user echarles commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/386#issuecomment-153724315
@Leemoonsoo I changed the bin/zeppelin.sh script to print the build
CLASSPATH just after the execution of the java command with
```
echo CLASSPATH=$CLASSPATH
$(exec $ZEPPELIN_RUNNER $JAVA_OPTS -cp $CLASSPATH_OVERRIDES:$CLASSPATH
$ZEPPELIN_SERVER "$@")
```
When I run exporting, I get
```
$ ZEPPELIN_CLASSPATH=MYJAR.JAR ./bin/zeppelin.sh
CLASSPATH=/opt/apache-ivy-2.3.0-rc1/ivy-2.3.0-rc1.jar:/opt/clojure-1.6.0/clojure-1.6.0.jar::/opt/zeppelin-incubator/zeppelin-server/target/lib/*:/opt/zeppelin-incubator/zeppelin-zengine/target/lib/*:/opt/zeppelin-incubator/zeppelin-interpreter/target/lib/*:/opt/zeppelin-incubator/*:MYJAR.JAR:/opt/zeppelin-incubator/conf:/opt/zeppelin-incubator/zeppelin-interpreter/target/classes:/opt/zeppelin-incubator/zeppelin-zengine/target/classes:/opt/zeppelin-incubator/zeppelin-server/target/classes
SLF4J: Found binding in
[jar:file:/opt/zeppelin-incubator/zeppelin-server/target/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in
[jar:file:/opt/zeppelin-incubator/zeppelin-zengine/target/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in
[jar:file:/opt/zeppelin-incubator/zeppelin-interpreter/target/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an
explanation.
...
which shows the MYJAR.JAR is not taken into account, hence the need for
CLASSPATH_OVERRIDES.
This is why we need a way to override by prepending, not appending.
This is useful when we deploy with e.g. a patched jar.
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