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 AttributeAssignValueSave attributeAssignValueSave = new AttributeAssignValueSave();
 AttributeAssignValueResult attributeAssignValueResult = attributeAssignValueSave.assignAttributeAssign(attributeAssign)
    .assignAttributeAssignValueOperation(AttributeAssignValueOperation.remove_value)
    .assignValue("hello").save();

Sample call to add attribute and value to stem

 AttributeValueResult attributeValueResult=sympaFolder.getAttributeValueDelegate().assignValue("etc:attribute:comanagetemplate:ownerfolderid", "someValue"); 
 gsh_builtin_gshTemplateOutput.addOutputLine("Attribute ownerfolderid assigned: " + attributeValueResult.getAttributeAssignValueResult().isChanged());
 

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Java docs:  https://software.internet2.edu/grouper/doc/2.5.x/grouper/apidocs/edu/internet2/middleware/grouper/attr/value/AttributeAssignValueSave.html