<dependency>
            <groupId>com.informix.jdbc</groupId>
            <artifactId>com.springsource.com.informix.jdbc</artifactId>
            <version>3.0.0.JC3</version>
        </dependency>

Missing artifact
com.informix.jdbc:com.springsource.com.informix.jdbc:jar:3.0.0.JC3

Please add the following dependency in your POM.xml

<dependency>
    <groupId>com.ibm.informix</groupId>
    <artifactId>jdbc</artifactId>
    <version>4.10.6.20151104</version>
</dependency>