Example usage for javax.servlet.jsp.el ELException getRootCause

Introduction

In this page you can find the example usage for javax.servlet.jsp.el ELException getRootCause.

Prototype

public Throwable getRootCause() 

Source Link

Document

Returns the root cause.

Usage

From source file:com.streamsets.datacollector.el.ELEvaluator.java

@Override
@SuppressWarnings("unchecked")
public <T> T evaluate(final ELVars vars, String expression, Class<T> returnType) throws ELEvalException {
    VariableResolver variableResolver = new VariableResolver() {

        @Override//from  w  w w . j av a  2 s. com
        public Object resolveVariable(String name) throws ELException {
            Object value = constants.get(name);
            if (!vars.hasVariable(name)) {
                if (value == null && !constants.containsKey(name)) {
                    throw new ELException(Utils.format("Constants/Variable '{}' cannot be resolved", name));
                }
            } else {
                value = vars.getVariable(name);
            }
            return value;
        }
    };
    try {
        return (T) EVALUATOR.evaluate(expression, returnType, variableResolver, functionMapper);
    } catch (ELException e) {
        LOG.debug("Error valuating EL '{}': {}", expression, e.toString(), e);
        Throwable t = e;
        if (e.getRootCause() != null) {
            t = e.getRootCause();
        }
        throw new ELEvalException(CommonError.CMN_0104, expression, t.toString(), e);
    }
}

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From source file:org.apache.oozie.util.ELEvaluator.java

/**
 * Evaluate an EL expression. <p>//ww  w .  j a  va2s  .  c  o m
 *
 * @param expr EL expression to evaluate.
 * @param clazz return type of the EL expression.
 * @return the object the EL expression evaluated to.
 * @throws Exception thrown if an EL function failed due to a transient error or EL expression could not be
 * evaluated.
 */
@SuppressWarnings({ "unchecked", "deprecation" })
public <T> T evaluate(String expr, Class<T> clazz) throws Exception {
    ELEvaluator existing = current.get();
    try {
        current.set(this);
        return (T) evaluator.evaluate(expr, clazz, context, context);
    } catch (ELException ex) {
        if (ex.getRootCause() instanceof Exception) {
            throw (Exception) ex.getRootCause();
        } else {
            throw ex;
        }
    } finally {
        current.set(existing);
    }
}

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From source file:org.apache.oozie.util.ELEvaluator.java

/**
 * Check if the input expression contains sequence statically. for example
 * identify if "," is present outside of a function invocation in the given
 * expression. Ex "${func('abc')},${func('def'}",
 *
 * @param expr - Expression string// www  .java2  s . co  m
 * @param sequence - char sequence to check in the input expression
 * @return true if present
 * @throws Exception Exception thrown if an EL function failed due to a
 *         transient error or EL expression could not be parsed
 */
public boolean checkForExistence(String expr, String sequence) throws Exception {
    try {
        Object exprString = evaluator.parseExpressionString(expr);
        if (exprString instanceof ExpressionString) {
            for (Object element : ((ExpressionString) exprString).getElements()) {
                if (element instanceof String && element.toString().contains(sequence)) {
                    return true;
                }
            }
        } else if (exprString instanceof String) {
            if (((String) exprString).contains(sequence)) {
                return true;
            }
        }
        return false;
    } catch (ELException ex) {
        if (ex.getRootCause() instanceof Exception) {
            throw (Exception) ex.getRootCause();
        } else {
            throw ex;
        }
    }
}

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