javax.swing.tree.TreeNodeは制限されたクラスです

getdocs

4年前

問題

次の環境でGoogle App EngineでStruts2を開発する。

Struts 2.3.1.2
フリーメーカ2.3.18
JDK 1.6
Eclipse用Eclipse 3.7 Google Plugin
Google App Engine Java SDK 1.6.3.1

GAEは、 `javax.swing.tree.TreeNode`が実際のGAEプロダクション環境にデプロイされた場合、ローカル開発における制限されたクラスであると訴えて、エラーメッセージは消えます。

Caused by:
java.lang.NoClassDefFoundError: javax.swing.tree.TreeNode is a restricted class.
    Please see the Google  App Engine developer's guide for more details.
    at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
    at freemarker.core.TextBlock.isIgnorable(TextBlock.java:375)
    at freemarker.core.TextBlock.heedsTrailingWhitespace(TextBlock.java:337)

解決策

GAE環境でなぜ動作するのかわかりません。ローカルGAE環境では、
TextBlock`クラスをオーバーロードし、以下のコードをコンパイルして__WEB-INF/classesに移動して、元の
TextBlock`クラスをオーバーロードします。

File:TextBlock.java

…./

Copyright (c) 2003 The Visigoth Software Society. All rights

reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions

are met:

1. Redistributions of source code must retain the above copyright

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copyright

notice, this list of conditions and the following disclaimer in

the documentation and/or other materials provided with the

distribution.

3. The end-user documentation included with the redistribution, if

any, must include the following acknowledgement:

“This product includes software developed by the

Visigoth Software Society (

http://www.visigoths.org/).”

Alternately, this acknowledgement may appear in the software
itself,

if and wherever such third-party acknowledgements normally
appear.

4. Neither the name “FreeMarker”, “Visigoth”, nor any of the names
of the

project contributors may be used to endorse or promote products
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from this software without prior written permission. For written

permission, please contact visigo…@visigoths.org.

5. Products derived from this software may not be called
“FreeMarker” or “Visigoth”

nor may “FreeMarker” or “Visigoth” appear in their names

without prior written permission of the Visigoth Software
Society.

THIS SOFTWARE IS PROVIDED “AS IS” AND ANY EXPRESSED OR IMPLIED

WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR

ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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**  This software consists of voluntary contributions made by many
**  individuals on behalf of the Visigoth Software Society. For more
**  information on the Visigoth Software Society, please see
**  http://www.visigoths.org/
** /package freemarker.core;

import java.io.IOException;
/

A TemplateElement representing a block of plain text.

@version $Id: TextBlock.java,v 1.17 2004/01/06 17:06:42 szegedia Exp $

/public final class TextBlock extends TemplateElement {
private static final char[]EMPTY

CHAR

ARRAY = new char[0];
static final TextBlock EMPTY

BLOCK = new TextBlock(EMPTY

CHAR__ARRAY, false);
//We’re using char[]instead of String for storing the text block because
//Writer.write(String) involves copying the String contents to a char[] //using String.getChars(), and then calling Writer.write(char[]). By
//using Writer.write(char[]) directly, we avoid array copying on each
//write.
private char[]text;
private final boolean unparsed;

public TextBlock(String text) {
    this(text, false);
}

public TextBlock(String text, boolean unparsed) {
    this(text.toCharArray(), unparsed);
}

private TextBlock(char[]text, boolean unparsed) {
    this.text = text;
    this.unparsed = unparsed;
}

/** **
  **  Simply outputs the text.
  ** /    public void accept(Environment env) throws IOException {
     env.getOut().write(text);
 }

public String getCanonicalForm() {
    String text = new String(this.text);
    if (unparsed) {
        return "<#noparse>" + text + "</#noparse>";
    }
    return text;
}

public String getDescription() {
    String s = new String(text).trim();
    if (s.length() == 0) {
        return "whitespace";
    }
    if (s.length() > 20) {
        s = s.substring(0, 20) + "...";
        s = s.replace('\n', ' ');
        s = s.replace('\r', ' ');
    }
    return "text block (" + s + ")";
}

TemplateElement postParseCleanup(boolean stripWhitespace) {
    if (text.length == 0)
        return this;
    int openingCharsToStrip = 0, trailingCharsToStrip = 0;
    boolean deliberateLeftTrim = deliberateLeftTrim();
    boolean deliberateRightTrim = deliberateRightTrim();
    if (!stripWhitespace || text.length == 0) {
        return this;
    }
    if (parent.parent == null && previousSibling() == null)
        return this;
    if (!deliberateLeftTrim) {
        trailingCharsToStrip = trailingCharsToStrip();
    }
    if (!deliberateRightTrim) {
        openingCharsToStrip = openingCharsToStrip();
    }
    if (openingCharsToStrip == 0 && trailingCharsToStrip == 0) {
        return this;
    }
    this.text = substring(text, openingCharsToStrip, text.length
            - trailingCharsToStrip);
    if (openingCharsToStrip > 0) {
        this.beginLine++;
        this.beginColumn = 1;
    }
    if (trailingCharsToStrip > 0) {
        this.endColumn = 0;
    }
    return this;
}

/** **
  **  Scans forward the nodes on the same line to see whether there is a
  **  deliberate left trim in effect. Returns true if the left trim was
  **  present.
  ** /    private boolean deliberateLeftTrim() {
     boolean result = false;
     for (TemplateElement elem = this.nextTerminalNode(); elem != null
             && elem.beginLine == this.endLine; elem = elem
             .nextTerminalNode()) {
         if (elem instanceof TrimInstruction) {
             TrimInstruction ti = (TrimInstruction) elem;
             if (!ti.left && !ti.right) {
                 result = true;
             }
             if (ti.left) {
                 result = true;
                 int lastNewLineIndex = lastNewLineIndex();
                 if (lastNewLineIndex >= 0 || beginColumn == 1) {
                     char[]firstPart = substring(text, 0,
                             lastNewLineIndex + 1);
                     char[]lastLine = substring(text, 1 + lastNewLineIndex);
                     if (trim(lastLine).length == 0) {
                         this.text = firstPart;
                         this.endColumn = 0;
                     } else {
                         int i = 0;
                         while (Character.isWhitespace(lastLine[i])) {
                             i++;
                         }
                         char[]printablePart = substring(lastLine, i);
                         this.text = concat(firstPart, printablePart);
                     }
                 }
             }
         }
     }
     if (result) {
     }
     return result;
 }

/** **
  **  Checks for the presence of a t or rt directive on the same line. Returns
  **  true if the right trim directive was present.
  ** /    private boolean deliberateRightTrim() {
     boolean result = false;
     for (TemplateElement elem = this.prevTerminalNode(); elem != null
             && elem.endLine == this.beginLine; elem = elem
             .prevTerminalNode()) {
         if (elem instanceof TrimInstruction) {
             TrimInstruction ti = (TrimInstruction) elem;
             if (!ti.left && !ti.right) {
                 result = true;
             }
             if (ti.right) {
                 result = true;
                 int firstLineIndex = firstNewLineIndex() + 1;
                 if (firstLineIndex == 0) {
                     return false;
                 }
                 if (text.length > firstLineIndex
                         && text[firstLineIndex - 1]== '\r'
                         && text[firstLineIndex]== '\n') {
                     firstLineIndex++;
                 }
                 char[]trailingPart = substring(text, firstLineIndex);
                 char[]openingPart = substring(text, 0, firstLineIndex);
                 if (trim(openingPart).length == 0) {
                     this.text = trailingPart;
                     this.beginLine++;
                     this.beginColumn = 1;
                 } else {
                     int lastNonWS = openingPart.length - 1;
                     while (Character.isWhitespace(text[lastNonWS])) {
                         lastNonWS--;
                     }
                     char[]printablePart = substring(text, 0, lastNonWS + 1);
                     if (trim(trailingPart).length == 0) {
                        //THIS BLOCK IS HEINOUS! THERE MUST BE A BETTER
                        //WAY! REVISIT (JR)
                         boolean trimTrailingPart = true;
                         for (TemplateElement te = this.nextTerminalNode(); te != null
                                 && te.beginLine == this.endLine; te = te
                                 .nextTerminalNode()) {
                             if (te.heedsOpeningWhitespace()) {
                                 trimTrailingPart = false;
                             }
                             if (te instanceof TrimInstruction
                                     && ((TrimInstruction) te).left) {
                                 trimTrailingPart = true;
                                 break;
                             }
                         }
                         if (trimTrailingPart)
                             trailingPart = EMPTY__CHAR__ARRAY;
                     }
                     this.text = concat(printablePart, trailingPart);
                 }
             }
         }
     }
     return result;
 }

/**
  **  private String leftTrim(String s) { int i =0; while (i<s.length()) { if
  **  (!Character.isWhitespace(s.charAt(i))) break; ++i; } return
  **  s.substring(i); }
  ** /    private int firstNewLineIndex() {
     String content = new String(text);
     int newlineIndex1 = content.indexOf('\n');
     int newlineIndex2 = content.indexOf('\r');
     int result = newlineIndex1 >= 0 ? newlineIndex1 : newlineIndex2;
     if (newlineIndex1 >= 0 && newlineIndex2 >= 0) {
         result = Math.min(newlineIndex1, newlineIndex2);
     }
     return result;
 }

private int lastNewLineIndex() {
    String content = new String(text);
    return Math.max(content.lastIndexOf('\r'), content.lastIndexOf('\n'));
}

/** **
  **  figures out how many opening whitespace characters to strip in the
  **  post-parse cleanup phase.
  ** /    private int openingCharsToStrip() {
     int newlineIndex = firstNewLineIndex();
     if (newlineIndex == -1 && beginColumn != 1) {
         return 0;
     }
     ++newlineIndex;
     if (text.length > newlineIndex) {
         if (newlineIndex > 0 && text[newlineIndex - 1]== '\r'
                 && text[newlineIndex]== '\n') {
             ++newlineIndex;
         }
     }
     if (new String(text).substring(0, newlineIndex).trim().length() > 0) {
         return 0;
     }
    //We look at the preceding elements on the line to see if we should
    //strip the opening newline and any whitespace preceding it.
     for (TemplateElement elem = this.prevTerminalNode(); elem != null
             && elem.endLine == this.beginLine; elem = elem
             .prevTerminalNode()) {
         if (elem.heedsOpeningWhitespace()) {
             return 0;
         }
     }
     return newlineIndex;
 }

/** **
  **  figures out how many trailing whitespace characters to strip in the
  **  post-parse cleanup phase.
  ** /    private int trailingCharsToStrip() {
     String content = new String(text);
     int lastNewlineIndex = lastNewLineIndex();
     if (lastNewlineIndex == -1 && beginColumn != 1) {
         return 0;
     }
     String substring = content.substring(lastNewlineIndex +1);
     if (substring.trim().length() >0) {
         return 0;
     } //We look at the elements afterward on the same line to see if we should //strip any whitespace after the last newline
     for (TemplateElement elem = this.nextTerminalNode();
          elem != null && elem.beginLine == this.endLine;
          elem = elem.nextTerminalNode())
     {
         if (elem.heedsTrailingWhitespace())
         {
             return 0;
         }
     }
     return substring.length();
 }
 boolean heedsTrailingWhitespace() {
     if (isIgnorable()) {
         return false;
     }
     for (int i = 0; i < text.length; i++) {
         char c = text[i];
         if (c == '\n' || c == '\r') {
             return false;
         }
         if (!Character.isWhitespace(c)) {
             return true;
         }
     }
     return true;
 }

boolean heedsOpeningWhitespace() {
    if (isIgnorable()) {
        return false;
    }
    for (int i = text.length - 1; i >= 0; i--) {
        char c = text[i];
        if (c == '\n' || c == '\r') {
            return false;
        }
        if (!Character.isWhitespace(c)) {
            return true;
        }
    }
    return true;
}

boolean isIgnorable() {
    if (text == null || text.length == 0) {
        return true;
    }
    if (!isWhitespace()) {
        return false;
    }
   //do the trick
    boolean atTopLevel = true;
    TemplateElement prevSibling = previousSibling();
    TemplateElement nextSibling = nextSibling();
    return ((prevSibling == null && atTopLevel) || nonOutputtingType(prevSibling))
            && ((nextSibling == null && atTopLevel) || nonOutputtingType(nextSibling));
}

private boolean nonOutputtingType(TemplateElement element) {
    return (element instanceof Macro || element instanceof Assignment
            || element instanceof AssignmentInstruction
            || element instanceof PropertySetting
            || element instanceof LibraryLoad || element instanceof Comment);
}

private static char[]substring(char[]c, int from, int to) {
    char[]c2 = new char[to - from];
    System.arraycopy(c, from, c2, 0, c2.length);
    return c2;
}

private static char[]substring(char[]c, int from) {
    return substring(c, from, c.length);
}

private static char[]trim(char[]c) {
    if (c.length == 0) {
        return c;
    }
    return new String(c).trim().toCharArray();
}

private static char[]concat(char[]c1, char[]c2) {
    char[]c = new char[c1.length + c2.length];
    System.arraycopy(c1, 0, c, 0, c1.length);
    System.arraycopy(c2, 0, c, c1.length, c2.length);
    return c;
}

    boolean isWhitespace() {
        return text == null || trim(text).length == 0;
    }
}

=== リファレンス

.  http://groups.google.com/group/google-appengine-java/browse__thread/thread/dd84e44f604498c4[Freemarker

2.4、GAE/J 1.2.6およびjavax.swing.tree.TreeNode]

link://tag/gae/[gae]link://tag/struts2/[struts2]