jsp - How to group boolean conditions in EL -


i'm having trouble evaluating pair of boolean expressions within jsf using el.

here's snippet:

<a4j:commandbutton id="addbtn" value="add school(s)"   action="#{somebean.someaction}"                          disabled="#{not studentrecords.isvalid , not studentrecords.schoolselected}"> </a4j:commandbutton>

isvalid , schoolselected returning boolean result either true or false. when i'm connection these 2 'and' operator not work.

i tried putting 

!studentrecords.isvalid , !studentrecords.schoolselected

but doesn't work.

el expressions automatically determine correct managed bean property long setters , getters written correctly.

non-boolean managed bean property

managed bean:

private long studentrecordnumber;  public long getstudentrecordnumber() {   return this.studentrecordnumber; }  public void setstudentrecordnumber(long studentrecordnumber) {   this.studentrecordnumber = studentrecordnumber; }

jsf markup

rednered="#{studentrecords.studentrecordnumber ne null}"

boolean managed bean property

managed bean:

private boolean valid;  public boolean isvalid() {   return this.valid; }  public void setvalid(boolean valid) {   this.valid = valid; }

jsf markup

rendered="#{not studentrecords.valid , not studentrecords.schoolselected}"

el expressions can used directly evaluate returned result of boolean method, method parentheses must used.

rendered="#{studentrecords.canstudentenrolltoday()}"

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