org.apache.chemistry.opencmis.commons.spi.Holder<String> objectIdHolder = convertHolder(objectId);
org.apache.chemistry.opencmis.commons.spi.Holder<Boolean> contentCopiedHolder = new org.apache.chemistry.opencmis.commons.spi.Holder<Boolean>();
ExtensionsData extData = convertExtensionHolder(extension);
service.checkOut(repositoryId, objectIdHolder, extData, contentCopiedHolder);
if (contentCopied != null) {
contentCopied.value = contentCopiedHolder.getValue();
}