安装GWT 2.6的问题 [英] Issue with installation of GWT 2.6
问题描述
我刚刚安装了GWT 2.6，现在收到错误描述资源路径位置类型
文件war \WEB-INF\lib\gwt-servlet.jar与GWT SDK的大小不同库gwt-servlet.jar;或许它是不同的版本？gwt-servlet.jar / AwardTracker / war / WEB-INF / lib未知的Google Web Toolkit问题
我下载了GWT 2.6 zip，然后将目录GWT-2.6.0复制到Eclipse \ Eclipse-jee-juno-SR1-win32\eclipse\plugins中。然后，我右键单击该项目并选择属性/ Google / Web工具包/配置SDK ... /添加。然后我浏览到GWT-2.6.0目录，添加并选择它。
我遵循解决方案来自Braj并在我重新编译时收到以下错误：
编译模块org.AwardTracker.AwardTracker
验证单元：
忽略了2个编译错误的单元第一遍。
使用-strict编译或使用-logLevel设置为TRACE或DEBUG以查看所有错误。
计算'gwtupload.client.DecoratedFileUpload.DecoratedFileUploadImpl'的所有可能重新绑定结果
重新绑定gwtupload.client.DecoratedFileUpload.DecoratedFileUploadImpl
找不到完全匹配规则。使用基于回退值的最接近规则。你可能需要实现一个特定的绑定，以防止回退行为不能替换缺失的绑定
[ERROR]'gwtupload / client / DecoratedFileUpload.java'中的错误
[错误]第347行：重新绑定结果'gwtupload.client.DecoratedFileUpload.DecoratedFileUploadImpl'不能是抽象的
通过下载gwtupload-1.0.1.jar，使用'Add External JARS'来添加它到库中去掉旧的gwtupload-0.6.6.jar。然后我重新编译和编译工作。但是，现在我在线上的MyCustomisedUploadServlet中有一个错误（此错误之前没有出现）：
protected static final String XML_ERROR_ITEM_NOT_FOUND =< + TAG_ERROR +>项未找到< /+ TAG_ERROR +>;
其余代码为：
package org.AwardTracker.server;
import gwtupload.server.UploadAction;
import gwtupload.server.exceptions.UploadActionException;
import gwtupload.shared.UConsts;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Hashtable;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
/ **
*这是一个如何使用UploadAction类的例子。
*
*此servlet将所有收到的文件保存在临时文件夹
*中，并在用户发送删除请求时将其删除。
*
* @author Manolo CarrascoMoñino
*
* /
public class MyCustomisedUploadServlet extends UploadAction {
private static final long serialVersionUID = 1L;
protected static final String XML_ERROR_ITEM_NOT_FOUND =< + TAG_ERROR +>项未找到< /+ TAG_ERROR +>;
Hashtable< String，String> receivedContentTypes = new Hashtable< String，String>（）;
/ **
*维护一个收到文件及其内容类型的列表。
* /
Hashtable< String，File> receivedFiles = new Hashtable< String，File>（）;
/ **
*重写executeAction以将接收到的文件保存在自定义位置
*中，并从会话中删除这些项目。
* /
@Override
public String executeAction（HttpServletRequest request，List< FileItem> sessionFiles）throws UploadActionException {
String response =;
@SuppressWarnings（unused）
int cont = 0;
for（FileItem item：sessionFiles）{
if（false == item.isFormField（））{
cont ++;
尝试{
///创建一个放置在默认系统临时文件夹中的临时文件
文件文件= File.createTempFile（upload-，.bin）;
item.write（file）;
///用收到的文件保存一个列表
receivedFiles.put（item.getFieldName（），file）;
receivedContentTypes.put（item.getFieldName（），item.getContentType（））;
///向客户端发送定制消息。
response + = file.getAbsolutePath（）;
} catch（Exception e）{
throw new UploadActionException（e）;
$ b ///从会话中删除文件，因为我们有它们的副本
removeSessionFileItems（request）;
///将您的自定义消息发送给客户端。
返回响应;
}
/ **
*获取上传文件的内容。
* /
@Override
public void getUploadedFile（HttpServletRequest request，HttpServletResponse response）throws IOException {
String fieldName = request.getParameter（UConsts.PARAM_SHOW）;
文件f = receivedFiles.get（fieldName）;
if（f！= null）{
response.setContentType（receivedContentTypes.get（fieldName））;
FileInputStream is = new FileInputStream（f）;
copyFromInputStreamToOutputStream（is，response.getOutputStream（））;
} else {
renderXmlResponse（request，response，XML_ERROR_ITEM_NOT_FOUND）;
}
}
/ **
*用户发送删除请求时删除文件。
* /
@Override
public void removeItem（HttpServletRequest request，String fieldName）throws UploadActionException {
File file = receivedFiles.get（fieldName）;
receivedFiles.remove（fieldName）;
receivedContentTypes.remove（fieldName）;
if（file！= null）{
file.delete（）;
}
}
}
我简单地评论了这一行（protected static final String XML_ERROR_ITEM_NOT_FOUND =<+ TAG_ERROR +> item not found;），重新编译并运行它，它工作正常。我希望这一切都能帮助别人。感谢Braj的帮助。
每当您更改GWT版本时，您必须清理您的项目来自前一个GWT版本自动生成的存根，如下图所示。
问题：文件 war \WEB-INF\lib\gwt-servlet.jar 与GWT SDK库的大小不同 gwt-的servlet.jar ;也许它是一个不同的版本？
解决方案：你的问题是 gwt-servlet.jar 由以前的GWT版本自动生成。只需将其与其他存根一起删除并重新编译项目即可。
I have just installed GWT 2.6 and am now getting the error "Description Resource Path Location Type The file war\WEB-INF\lib\gwt-servlet.jar has a different size than GWT SDK library gwt-servlet.jar; perhaps it is a different version? gwt-servlet.jar /AwardTracker/war/WEB-INF/lib Unknown Google Web Toolkit Problem"
I downloaded the GWT 2.6 zip and then copied the directory "GWT-2.6.0" into "Eclipse\eclipse-jee-juno-SR1-win32\eclipse\plugins". I then right clicked on the project and selected "properties/Google/Web Toolkit/Configure SDKs.../Add". I then browsed to the "GWT-2.6.0" directory, added it and selected it.
I followed the solution from Braj and received the following errors when I recompiled:
Compiling module org.AwardTracker.AwardTracker Validating units: Ignored 2 units with compilation errors in first pass. Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors. Computing all possible rebind results for 'gwtupload.client.DecoratedFileUpload.DecoratedFileUploadImpl' Rebinding gwtupload.client.DecoratedFileUpload.DecoratedFileUploadImpl Could not find an exact match rule. Using 'closest' rule based on fall back values. You may need to implement a specific binding in case the fall back behavior does not replace the missing binding [ERROR] Errors in 'gwtupload/client/DecoratedFileUpload.java' [ERROR] Line 347: Rebind result 'gwtupload.client.DecoratedFileUpload.DecoratedFileUploadImpl' cannot be abstract
The above was fixed by downloading gwtupload-1.0.1.jar, using 'Add External JARS' to add it to the library and removing the old gwtupload-0.6.6.jar. I then recompiled and the compile work. However, now I have an error in my "MyCustomisedUploadServlet" on the line (this error was not present before):
protected static final String XML_ERROR_ITEM_NOT_FOUND = "<" + TAG_ERROR + ">item not found</" + TAG_ERROR + ">";
The rest of the code is:
package org.AwardTracker.server;
import gwtupload.server.UploadAction;
import gwtupload.server.exceptions.UploadActionException;
import gwtupload.shared.UConsts;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Hashtable;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
/**
* This is an example of how to use UploadAction class.
*
* This servlet saves all received files in a temporary folder,
* and deletes them when the user sends a remove request.
*
* @author Manolo Carrasco Moñino
*
*/
public class MyCustomisedUploadServlet extends UploadAction {
private static final long serialVersionUID = 1L;
protected static final String XML_ERROR_ITEM_NOT_FOUND = "<" + TAG_ERROR + ">item not found</" + TAG_ERROR + ">";
Hashtable<String, String> receivedContentTypes = new Hashtable<String, String>();
/**
* Maintain a list with received files and their content types.
*/
Hashtable<String, File> receivedFiles = new Hashtable<String, File>();
/**
* Override executeAction to save the received files in a custom place
* and delete this items from session.
*/
@Override
public String executeAction(HttpServletRequest request, List<FileItem> sessionFiles) throws UploadActionException {
String response = "";
@SuppressWarnings("unused")
int cont = 0;
for (FileItem item : sessionFiles) {
if (false == item.isFormField()) {
cont ++;
try {
/// Create a temporary file placed in the default system temp folder
File file = File.createTempFile("upload-", ".bin");
item.write(file);
/// Save a list with the received files
receivedFiles.put(item.getFieldName(), file);
receivedContentTypes.put(item.getFieldName(), item.getContentType());
/// Send a customised message to the client.
response += file.getAbsolutePath();
} catch (Exception e) {
throw new UploadActionException(e);
}
}
}
/// Remove files from session because we have a copy of them
removeSessionFileItems(request);
/// Send your customised message to the client.
return response;
}
/**
* Get the content of an uploaded file.
*/
@Override
public void getUploadedFile(HttpServletRequest request, HttpServletResponse response) throws IOException {
String fieldName = request.getParameter(UConsts.PARAM_SHOW);
File f = receivedFiles.get(fieldName);
if (f != null) {
response.setContentType(receivedContentTypes.get(fieldName));
FileInputStream is = new FileInputStream(f);
copyFromInputStreamToOutputStream(is, response.getOutputStream());
} else {
renderXmlResponse(request, response, XML_ERROR_ITEM_NOT_FOUND);
}
}
/**
* Remove a file when the user sends a delete request.
*/
@Override
public void removeItem(HttpServletRequest request, String fieldName) throws UploadActionException {
File file = receivedFiles.get(fieldName);
receivedFiles.remove(fieldName);
receivedContentTypes.remove(fieldName);
if (file != null) {
file.delete();
}
}
}
I simply commented this line out (" protected static final String XML_ERROR_ITEM_NOT_FOUND = "<" + TAG_ERROR + ">item not found";"), recompiled and ran it and it works fine. I hope all this helps others. Thank you to Braj for his help.
Whenever you change the GWT version you have to clean your project from the stub that is auto-generated by the previous GWT version as shown in below screenshots.
Problem: The file war\WEB-INF\lib\gwt-servlet.jar has a different size than GWT SDK library gwt-servlet.jar; perhaps it is a different version?
Solution: The problem in your case is gwt-servlet.jar that is auto-generated by previous GWT version. Just delete it along with other stub and re-compile project again.
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