How to install ant's build.xml file using existing ant libraries?

I have a project which is supposed to be installed in Redhat 6.7. It has it's own ant libraries in lib folder. Libraries is shown in the image below: enter image description here

I have an install script which triggers build.xml file. And the content of the script is as follows:

OLD_DIR=$(pwd)
SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
cd ${SCRIPT_DIR}

set ANT_HOME=$SCRIPT_DIR/ant
set ANT_LIB=${ANT_HOME}/lib

set PATH=${ANT_HOME}/bin:${ANT_LIB}:${PATH}

${ANT_HOME}/bin/ant -q -e

cd ${OLD_DIR}
exit 0

After installing through the install script i am getting,

BUILD FAILED

XML parser factory has not been configured correctly: Provider for class javax.xml.parsers.SAXParserFactory cannot be created

I think that it is causing due to pre-installed ant in redhat 6.7 but i am not sure about it.

Solution

There was the problem in java classpath. Fixing that solved the issue.