* Webapps: Allow additions to a webapp classpath. This will let us:

- Pull jstl.jar and standard.jar out of susidns.war
      - Remove 100KB of duplicate classes from i2psnark.war
      - Add classpaths for plugins

apps/routerconsole/java/src/net/i2p/router/web/WebAppStarter.java

@@ -0,0 +1,60 @@
+package net.i2p.router.web;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Properties;
+import java.util.StringTokenizer;
+
+import net.i2p.I2PAppContext;
+
+import org.mortbay.jetty.Server;
+import org.mortbay.jetty.servlet.WebApplicationContext;
+
+
+/**
+ *  Start a webappapp classpath as specified in webapps.config.
+ *
+ *  Sadly, setting Class-Path in MANIFEST.MF doesn't work for jetty wars.
+ *  We could look there ourselves, or look for another properties file in the war,
+ *  but let's just do it in webapps.config.
+ *
+ *  No, wac.addClassPath() does not work.
+ *
+ *  http://servlets.com/archive/servlet/ReadMsg?msgId=511113&listName=jetty-support
+ *
+ *  @since 0.7.12
+ *  @author zzz
+ */
+public class WebAppStarter {
+
+    /**
+     *  adds and starts
+     */
+    static void startWebApp(I2PAppContext ctx, Server server, String appName, String warPath) throws Exception {
+         File tmpdir = new File(ctx.getTempDir(), "jetty-work-" + appName + ctx.random().nextInt());
+         WebApplicationContext wac = addWebApp(ctx, server, appName, warPath, tmpdir);
+         wac.start();
+    }
+
+    /**
+     *  add but don't start
+     */
+    static WebApplicationContext addWebApp(I2PAppContext ctx, Server server, String appName, String warPath, File tmpdir) throws IOException {
+
+        WebApplicationContext wac = server.addWebApplication("/"+ appName, warPath);
+        tmpdir.mkdir();
+        wac.setTempDirectory(tmpdir);
+
+        // this does the passwords...
+        RouterConsoleRunner.initialize(wac);
+
+        // see WebAppConfiguration for info
+        String[] classNames = server.getWebApplicationConfigurationClassNames();
+        String[] newClassNames = new String[classNames.length + 1];
+        for (int j = 0; j < classNames.length; j++)
+             newClassNames[j] = classNames[j];
+        newClassNames[classNames.length] = WebAppConfiguration.class.getName();
+        wac.setConfigurationClassNames(newClassNames);
+        return wac;
+    }
+}