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Tobago JSF 1.1-1.2 Compatibility Bridge (makes Tobago independent from differences between JSF 1.1 and JSF 1.2).
There is a newer version: 1.6.0-beta-2
package org.apache.myfaces.tobago.util;

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.el.ValueExpression;
import javax.faces.context.FacesContext;
import java.util.Comparator;
import java.util.Map;

public class ValueExpressionComparator extends ComparatorBase {

  private static final Logger LOG = LoggerFactory.getLogger(ValueExpressionComparator.class);

  private FacesContext facesContext;

  private String var;

  private ValueExpression valueExpression;

  public ValueExpressionComparator(FacesContext facesContext, String var, ValueExpression valueExpression) {
    this.facesContext = facesContext;
    this.var = var;
    this.valueExpression = valueExpression;
  }

  public ValueExpressionComparator(FacesContext facesContext, String var, ValueExpression valueExpression,
      boolean reverse) {
    super(reverse);
    this.facesContext = facesContext;
    this.var = var;
    this.valueExpression = valueExpression;
  }

  public ValueExpressionComparator(FacesContext facesContext, String var,
      ValueExpression valueExpression, Comparator comparator) {
    super(comparator);
    this.facesContext = facesContext;
    this.var = var;
    this.valueExpression = valueExpression;
  }

  public ValueExpressionComparator(FacesContext facesContext, String var,
      ValueExpression valueExpression, boolean reverse, Comparator comparator) {
    super(reverse, comparator);
    this.facesContext = facesContext;
    this.var = var;
    this.valueExpression = valueExpression;
  }

  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    final ValueExpressionComparator that = (ValueExpressionComparator) o;

    if (!super.equals(o)) {
      return false;
    }
    if (facesContext != null ? !facesContext.equals(that.facesContext) : that.facesContext != null) {
      return false;
    }
    if (valueExpression != null ? !valueExpression.equals(that.valueExpression) : that.valueExpression != null) {
      return false;
    }
    if (var != null ? !var.equals(that.var) : that.var != null) {
      return false;
    }

    return true;
  }

  public int hashCode() {
    int result;
    result = (facesContext != null ? facesContext.hashCode() : 0);
    result = 29 * result + (var != null ? var.hashCode() : 0);
    result = 29 * result + (valueExpression != null ? valueExpression.hashCode() : 0);
    result = 29 * result + super.hashCode();
    return result;
  }

  // implementation of java.util.Comparator interface

  /**
   * @param param1 
   * @param param2 
   * @return 
   */
  public int compare(Object param1, Object param2) {
    Object obj1;
    Object obj2;
    try {
      final Map requestMap = facesContext.getExternalContext().getRequestMap();
      requestMap.put(var, param1);
      obj1 = valueExpression.getValue(facesContext.getELContext());
      requestMap.put(var, param2);
      obj2 = valueExpression.getValue(facesContext.getELContext());

    } catch (Exception e) {
      LOG.error(e.getMessage(), e);
      return 0;
    }
    return super.internalCompare(obj1, obj2);
  }
}