Hi,
I am having a similar issue. It appears that GAE doesn't always return the
the script engine, for I get a NULL Exception. My code looks like:
public double myEval(String JsFormulaStr ) {
double solutionValue = 0;
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine eng = mgr.getEngineByName("JavaScript");
if(eng == null) { // Added this block of code to prevent
java.lang.NullPointerExceptoin...
log.severe("Unable to get Script Engine." );
return 0;
}
try {
Object jsResults = eng.eval(JsFormulaStr);
solutionValue = Double.parseDouble(jsResults.toString());
return solutionValue;
} catch(Exception e) {
log.severe("[ERROR] in
getCalculatedSolution_FromJS_ToDouble()::\n\t" +
"Formula String is: " + JsFormulaStr + "\n\t" + e);
return 0;
}
}
Everything works fine if I run it locally as a WebApp (Both in Eclipse &
Netbeans. And within Tomcat & Glassfish 4.0).
Some of the strings which I tried to eval:
- 62.0 / 100
- 0.0 * 352.0
- (0 - 428) * 1000
- (0 - 597) * 1000
- 73.0 / 100
NOTE: The '0' or '0.0' is from other evaluations. Since the function
returns 0 on an exception.
Thanks,
Randy
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