Cannot obtain ObjectFactory for reference javax.sql.DataSource

Hello,

I am using jdbc/DefaultDB as my datasource through spring-cloud-connector. While deploying it on Java Web Tomcat 7, I am getting below errors:

"Cannot obtain ObjectFactory for reference javax.sql.DataSource"

"org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()Lorg/slf4j/ILoggerFactory;" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, org/slf4j/LoggerFactory, and the class loader (instance of sun/misc/Launcher$AppClassLoader) for the method's defining class, org/slf4j/impl/StaticLoggerBinder, have different Class objects for the type org/slf4j/ILoggerFactory used in the signature

at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:332)

at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:280)

at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:301)

at com.sap.cloud.runtime.kotyo.mail.client.MailObjectFactory.<clinit>(MailObjectFactory.java:40)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:422)

at java.lang.Class.newInstance(Class.java:442)

at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:380)

Below is the code snippet for datasource lookup:

final JndiDataSourceLookup dsLookup = new JndiDataSourceLookup();

dsLookup.setResourceRef(true);

DataSource dataSource = dsLookup.getDataSource("java:comp/env/jdbc/DefaultDB");

return dataSource;

I have referenced this resource in my web.xml as follow:

<resource-ref>

<res-ref-name>jdbc/DefaultDB</res-ref-name>

<res-type>javax.sql.DataSource</res-type>

</resource-ref>

Can someone please help in identifying the error resolution?