java - Applying OGNL expression to a context variable -

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i'm working struts2 (unexperienced developer) , i've been searching couldn't find how apply ognl expression variable stored in context.

the thing need retrieve parameter context , uppercase it. now, i've tried way sadly no luck:

<s:property value="#myvar.touppercase()" />

as works variables stored in valuestack (notation without #), don't understand why won't work stored in context..

i'm able print #myvarcontent fine if dont append .touppercase() it.

also tried workaround didn't help:

<s:property value="<s:property value="#myvar"/>.touppercase()"/>

so what's thing i'm missing? how can apply ognl expression variable stored in context?

many thanks

your variable isn't string there isn't touppercase() method in it. solution call tostring() before calling touppercase().

<s:property value="#myvar.tostring().touppercase()" />

update

actually problem here <s:set var="myvar" value="%{#parameters.myvar}"/> since there more 1 myvar in parameters return array of strings, if want single parameter change expression #parameters.myvar[0] , touppercase() work.

<s:set var="myvar" value="%{#parameters.myvar[0]}"/> <s:property value="#myvar.touppercase()" />

or

<s:set var="myvars" value="%{#parameters.myvar}"/> <s:property value="#myvars[0].touppercase()" />

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