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    <p>this test case should mimic your problem</p> <pre><code>package com.sg2net.test; public class TestCast { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub TestCast tc= new TestCast(); tc.funcEval(); } public double funcEval(){ return ((Long) eval()).doubleValue(); } private Object eval() { return new Long(1); } } </code></pre> <p>It runs without problems. Is the code you posted the code that gives you the exception?</p> <p>here is you code with the Long modification</p> <pre><code>import org.apache.commons.jexl2.*; public class NelderMead { // контсанты private static int M = 3; private static double E = 0.005; private static double A = 1.000; private static double B = 0.500; private static double Y = 2.000; // переменные private JexlEngine jexl; private Expression func; private String funcString = ""; private MapContext[] iterations; public NelderMead(){ this.jexl = new JexlEngine(); } public NelderMead(String funcString){ this.jexl = new JexlEngine(); this.setFunc(funcString); } public void setFunc(String funcString){ this.funcString = funcString; this.func = this.jexl.createExpression(funcString); } public double funcEval(MapContext args){ return ((Long) this.func.evaluate(args)).doubleValue(); } public boolean checkCriterian(){ return true; } } </code></pre> <p>It runs with no problems. The evaluate functions returns a Long which is an Object. The evaluate function can return any class since Object is the root class in Java.</p>
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    1. COI update the code in answer. And maybe it will be helpful - evaluate() function have Object as return type.
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    2. COMy method eval has Object as return type. Your code still seems the same
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    3. CONow I see the new code, your expression returns a Long object, it cannost be cast to Double sine they are Object not primitive types. You have user a Long variable for holdin the this.func.evaluate result and the convert it to double
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