Pig command not working in centos.

[#1]

We recently installed Pig 0.15.0 on our system. We already have Hadoop 2.7.1 installed on our system. But while running the pig command we get the following exception :-

[hadoop1@hp_proliant ~]$ pig
Exception in thread "main" java.lang.NoClassDefFoundError: org/antlr/runtime/RecognitionException
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
        at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
        at java.lang.Class.getMethod0(Class.java:3018)
        at java.lang.Class.getMethod(Class.java:1784)
        at org.apache.hadoop.util.RunJar.run(RunJar.java:215)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.lang.ClassNotFoundException: org.antlr.runtime.RecognitionException
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 7 more

Following is the content of our bashrc file for any reference to path settings :-

export JAVA_HOME=/opt/jdk1.8.0_65
export HADOOP_HOME=/home/hadoop1/hadoop1
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export YARN_HOME=$HADOOP_HOME
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop
export YARN_CONF_DIR=$HADOOP_HOME/etc/hadoop
export HBASE_HOME=/home/hadoop1/hbase-1.1.4
export PATH=$PATH:$HOME/bin:$JAVA_HOME/bin:$HADOOP_HOME/sbin:$HADOOP_HOME/bin:$HBASE_HOME/bin:$HBASE_HOME/lib/*
export CLASSPATH=$CLASSPATH:/home/hadoop1/hbase-1.1.4/lib/*
export PIG_HOME=/home/hadoop1/Pig
export PATH=$PATH:/home/hadoop1/Pig/bin
export PIG_CLASSPATH=$CLASSPATH:/home/hadoop1/Pig/lib/*

What possible could be the problem for this exception?

[#2]

@Kumar Sanyam

Looks like below jar is missing from PIG lib directory. Please cross check

antlr-runtime-<version>.jar

[#3]

It exists in the lib directory. : /home/hadoop1/Pig/lib/antlr-runtime-3.4.jar

[#4]

@Kumar Sanyam

Could you please check whether antlr runtime is available in pig classpath using

pig -printCmdDebug | grep antlr --color

[#5]

/home/hadoop1/Pig/lib/antlr-runtime-3.4.jar

The above line exists in the output generated while running the given command.

[#6 · Accepted solution]

The command worked! I added the lib dir of Pig to the HADOOP_CLASSPATH in hadoop-env.sh.