HtmlAttributesImpl中的方法
public void setCssProperty(Component component, String querySelector, String propertyName, String value) {
checkNotNullArgument(component);
checkNotNullArgument(querySelector);
checkNotNullArgument(propertyName);
com.vaadin.ui.Component vComponent = component.unwrapComposition(com.vaadin.ui.Component.class);
HtmlAttributesExtension.get(vComponent)
.setCssProperty(querySelector, propertyName, value);
}
当传入的component是Table.PlainTextCell时,vComponent是null,会导致后面的语句执行报空指针,这个地方应该加个为null的判断