// recreate expr from string
Expression exprdbg = jdbg.createExpression(expressiondbg);
// make arg cause become the root cause
JexlNode root = ((ExpressionImpl) exprdbg).script;
while (root.jjtGetParent() != null) {
root = root.jjtGetParent();
}
// test equality
String reason = JexlTestCase.checkEquals(root, node);
if (reason != null) {
throw new RuntimeException("debugger equal failed: "