IType javaType = JdtUtils.getJavaType(project, className);
if (javaType == null)
return false;
ITypeHierarchy hierarchy = javaType.newSupertypeHierarchy(new NullProgressMonitor());
IType[] interfaces = hierarchy.getAllSuperInterfaces(javaType);
for (IType type : interfaces) {
if (type.getElementName().equals("CustomConverter")) {
return true;