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https://issues.apache.org/jira/browse/WICKET-3163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931678#action_12931678
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Peter Ertl commented on WICKET-3163:
------------------------------------
Seems like this improvement was really necessary as we get timeouts on hudson
quite often, e.g.:
https://hudson.apache.org/hudson/job/Apache%20Wicket%201.5.x/507/org.apache.wicket$wicket
Should be solved now :-)
> support building wicket offline by resolving DTD references locally
> -------------------------------------------------------------------
>
> Key: WICKET-3163
> URL: https://issues.apache.org/jira/browse/WICKET-3163
> Project: Wicket
> Issue Type: Improvement
> Components: wicket
> Affects Versions: 1.5-M3
> Reporter: Peter Ertl
> Assignee: Peter Ertl
> Fix For: 1.5-M4
>
> Attachments: local-lookup.patch, LocalEntityResolver.java
>
>
> Wicket developers, please give me some comment on this:
> Some wicket test cases parse XML which refers to an external DTD.
> An example is org.apache.wicket.protocol.http.WicketFilterTest
> It refers to org.apache.wicket.util.file.WebXmlFile will will parse a custom
> web.xml.
> The web.xml will make the parser to look up
> http://java.sun.com/dtd/web-app_2_3.dtd
> When building wicket offline this will cause a network error and the test
> will fail.
> I would like to add
> org.apache.wicket.util.xml.LocalEntityResolver
> which may contain a set of local entitites to avoid hitting the network.
> As wicket 1.5 is getting close to final I would like to get some feedback
> first before putting that into trunk...
> By adding this like to WebXmlFile network lookup would be avoided.
>
> DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
> DocumentBuilder builder = factory.newDocumentBuilder();
> builder.setEntityResolver(LocalEntityResolver.getDefault()); // no more
> network lookups
> Document document = builder.parse(is);
> ----------------------------------------------------
> package org.apache.wicket.util.xml;
> import org.apache.wicket.util.lang.Args;
> import org.xml.sax.EntityResolver;
> import org.xml.sax.InputSource;
> import org.xml.sax.SAXException;
> import javax.servlet.Filter;
> import java.io.IOException;
> import java.io.InputStream;
> import java.util.HashMap;
> import java.util.Map;
> /**
> * entity resolver that tries to locate a document type definition (DTD)
> using a set of custom entity resolvers
> *
> * @author pete
> */
> public class LocalEntityResolver implements EntityResolver
> {
> private final Map<EntityKey, EntityLocator> entities = new
> HashMap<EntityKey, EntityLocator>(3);
> public static LocalEntityResolver getDefault()
> {
> LocalEntityResolver resolver = new LocalEntityResolver();
>
> //
> // look up servlet 2.3 web.xml DTD right from inside servlet-api.jar
> //
> resolver.put(new EntityKey("-//Sun Microsystems, Inc.//DTD Web
> Application 2.3//EN",
>
> "http://java.sun.com/dtd/web-app_2_3.dtd";),
> new ServletApiEntityLocator("web-app_2_3.dtd"));
> return resolver;
> }
> public void put(EntityKey key, EntityLocator locator)
> {
> Args.notNull(key, "key");
> Args.notNull(locator, "locator");
> entities.put(key, locator);
> }
> public InputSource resolveEntity(String id, String url) throws
> SAXException, IOException
> {
> for (Map.Entry<EntityKey, EntityLocator> entry :
> entities.entrySet())
> if (entry.getKey().id.equals(id) ||
> entry.getKey().url.equals(url))
> return entry.getValue().locateInputSource();
> return null;
> }
> public static class EntityKey
> {
> private final String id;
> private final String url;
> private EntityKey(String id, String url)
> {
> Args.notEmpty(id, "id");
> Args.notEmpty(url, "url");
> this.id = id;
> this.url = url;
> }
> @Override
> public boolean equals(Object o)
> {
> if (this == o)
> return true;
> if (!(o instanceof EntityKey))
> return false;
> EntityKey key = (EntityKey) o;
> if (!id.equals(key.id))
> return false;
> return url.equals(key.url);
> }
> @Override
> public int hashCode()
> {
> int result = id.hashCode();
> result = 31 * result + url.hashCode();
> return result;
> }
> }
> public static interface EntityLocator
> {
> InputSource locateInputSource() throws SAXException,
> IOException;
> }
> public static class ServletApiEntityLocator implements EntityLocator
> {
> private final String name;
> private ServletApiEntityLocator(String name)
> {
> this.name = name;
> }
> public InputSource locateInputSource()
> {
> InputStream stream =
> Filter.class.getResourceAsStream("resources/" + name);
> if (stream == null)
> return null;
> return new InputSource(stream);
> }
> }
> }
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