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<title>Web App Classpath Problem</title>
<h1>Web App Classpath Problem</h1>
<p>You were directed to this help topic because your server code needed a class or
resource that was not found on the <i>web app classpath</i>, but <b>was</b> found
on the <i>system classpath</i>. The <i>system classpath</i> is the classpath
you specify when launching the Java VM to run hosted mode. The <i>web app
classpath</i> is different &mdash; it consists of classes that live in your web
application's <i>war directory</i>. All server classes and dependencies should
to be placed in your war directory: libraries (jars) should be placed in
<nobr><code>war/WEB-INF/lib/</code></nobr> and classes that don't live in
jars should be placed in <nobr><code>war/WEB-INF/classes/</code></nobr>.
<p>GWT hosted mode helpfully works around this problem by mapping these outside
resources into your web app classpath. This warning reminds you that failing to
address the issue can lead to problems when you actually deploy your web app to
a real server.</p>
<li>The most common reason to encounter this problem with a new project is
using RPC, which tries to load
<nobr><code></code></nobr>. The
solution to is copy <code>gwt-servlet.jar</code> from the GWT install directory
into your web app's <nobr><code>war/WEB-INF/lib/</code></nobr> directory.</li>
<li>If you have a good reason for not following the recommended configuration,
you can suppress warning by setting the Java system property
<nobr><code>gwt.nowarn.webapp.classpath</code></nobr>. Specify
<nobr><code>-Dgwt.nowarn.webapp.classpath</code></nobr> as a JVM argument when
launching hosted mode.