| career | drupal | java | mac | mysql | perl | scala | uml | unix  

Tomcat example source code file (

This example Tomcat source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

class, class, classnotfoundexception, elexception, elexception, externalizable, io, ioexception, methodexpression, methodexpressionliteral, methodexpressionliteral, methodinfo, object, string, string

The Tomcat source code

 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.el;


import javax.el.ELContext;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.el.MethodInfo;

import org.apache.el.lang.ELSupport;
import org.apache.el.util.ReflectionUtil;

public class MethodExpressionLiteral extends MethodExpression implements Externalizable {

    private Class expectedType;

    private String expr;
    private Class[] paramTypes;
    public MethodExpressionLiteral() {
        // do nothing
    public MethodExpressionLiteral(String expr, Class expectedType, Class[] paramTypes) {
        this.expr = expr;
        this.expectedType = expectedType;
        this.paramTypes = paramTypes;

    public MethodInfo getMethodInfo(ELContext context) throws ELException {
        return new MethodInfo(this.expr, this.expectedType, this.paramTypes);

    public Object invoke(ELContext context, Object[] params) throws ELException {
        if (this.expectedType != null) {
            return ELSupport.coerceToType(this.expr, this.expectedType);
        } else {
            return this.expr;

    public String getExpressionString() {
        return this.expr;

    public boolean equals(Object obj) {
        return (obj instanceof MethodExpressionLiteral && this.hashCode() == obj.hashCode());

    public int hashCode() {
        return this.expr.hashCode();

    public boolean isLiteralText() {
        return true;

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        this.expr = in.readUTF();
        String type = in.readUTF();
        if (!"".equals(type)) {
            this.expectedType = ReflectionUtil.forName(type);
        this.paramTypes = ReflectionUtil.toTypeArray(((String[]) in

    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeUTF((this.expectedType != null) ? this.expectedType.getName()
                : "");

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller


new blog posts


Copyright 1998-2021 Alvin Alexander,
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.