In SafeHtmlWhitelistRelexedDto.java,
I use WhiteListType.RELAXED annotation like this:

@SafeHtml(whitelistType=WhiteListType.RELAXED)
private String stringData1;

And then, I tested "<div>" and "<span>" tags like this:

safeHtmlWhitelistRelexedDto.setStringData1("<div>1234qwer</div>");
constraintViolations = validator.validate(safeHtmlWhitelistRelexedDto);
logger.error("violation count: {}", constraintViolations.size());
for (ConstraintViolation<?> violation : constraintViolations) {
logger.error("executableParameters: {}", violation.getExecutableParameters());
logger.error("executableReturnValue: {}", violation.getExecutableReturnValue());
logger.error("constraintDescriptor: {}", violation.getConstraintDescriptor());
logger.error("propertyPath: {}", violation.getPropertyPath());
logger.error("invalidValue: {}", violation.getInvalidValue());
logger.error("message: {}", violation.getMessage());
}
Assert.assertEquals(1, constraintViolations.size());

safeHtmlWhitelistRelexedDto.setStringData1("<span>1234qwer</span>");
constraintViolations = validator.validate(safeHtmlWhitelistRelexedDto);
logger.error("violation count: {}", constraintViolations.size());
for (ConstraintViolation<?> violation : constraintViolations) {
logger.error("executableParameters: {}", violation.getExecutableParameters());
logger.error("executableReturnValue: {}", violation.getExecutableReturnValue());
logger.error("constraintDescriptor: {}", violation.getConstraintDescriptor());
logger.error("propertyPath: {}", violation.getPropertyPath());
logger.error("invalidValue: {}", violation.getInvalidValue());
logger.error("message: {}", violation.getMessage());
}
Assert.assertEquals(1, constraintViolations.size());

Failure Trace is like this:

java.lang.AssertionError: expected:<1> but was:<0>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:834)
at org.junit.Assert.assertEquals(Assert.java:645)
at org.junit.Assert.assertEquals(Assert.java:631)
at javax.validation.HibernateValidatorTest.testSafehtmlWhitelistRelexed(HibernateValidatorTest.java:218)
...

According to JavaDoc, allowed tags are:
a, b, blockquote, br, caption, cite, code, col, colgroup, dd, dl, dt, em, h1, h2, h3, h4, h5, h6, i, img, li, ol, p, pre, q, small, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, u, ul

How can I validate "<div>", "<span>" tags?